/*****************************************************************************

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2008, 2009 Google Inc.
Copyright (c) 2009, 2016, Percona Inc.
Copyright (c) 2012, Facebook Inc.

Portions of this file contain modifications contributed and copyrighted by
Google, Inc. Those modifications are gratefully acknowledged and are described
briefly in the InnoDB documentation. The contributions by Google are
incorporated with their permission, and subject to the conditions contained in
the file COPYING.Google.

Portions of this file contain modifications contributed and copyrighted
by Percona Inc.. Those modifications are
gratefully acknowledged and are described briefly in the InnoDB
documentation. The contributions by Percona Inc. are incorporated with
their permission, and subject to the conditions contained in the file
COPYING.Percona.

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA

*****************************************************************************/

/** @file ha_innodb.cc */

#include "univ.i"

/* Include necessary SQL headers */
#include "ha_prototypes.h"
#include <debug_sync.h>
#include <gstream.h>
#include <log.h>
#include <mysys_err.h>
#include <strfunc.h>
#include <sql_acl.h>
#include <sql_class.h>
#include <sql_show.h>
#include <sql_table.h>
#include <sql_tablespace.h>
#include <sql_thd_internal_api.h>
#include <my_check_opt.h>
#include <my_bitmap.h>
#include <mysql/service_thd_alloc.h>
#include <mysql/service_thd_wait.h>

/* Include necessary InnoDB headers */
#include "api0api.h"
#include "api0misc.h"
#include "btr0btr.h"
#include "btr0cur.h"
#include "btr0bulk.h"
#include "btr0sea.h"
#include "buf0dblwr.h"
#include "buf0dump.h"
#include "buf0flu.h"
#include "buf0lru.h"
#include "dict0boot.h"
#include "dict0crea.h"
#include "dict0dict.h"
#include "dict0stats.h"
#include "dict0stats_bg.h"
#include "fil0fil.h"
#include "fsp0fsp.h"
#include "fsp0space.h"
#include "fsp0sysspace.h"
#include "fts0fts.h"
#include "fts0plugin.h"
#include "fts0priv.h"
#include "fts0types.h"
#include "ibuf0ibuf.h"
#include "lock0lock.h"
#include "log0log.h"
#include "log0online.h"
#include "mem0mem.h"
#include "mtr0mtr.h"
#include "os0file.h"
#include "os0thread.h"
#include "page0zip.h"
#include "pars0pars.h"
#include "rem0types.h"
#include "row0import.h"
#include "row0ins.h"
#include "row0merge.h"
#include "row0mysql.h"
#include "row0quiesce.h"
#include "row0sel.h"
#include "row0trunc.h"
#include "row0upd.h"
#include "srv0mon.h"
#include "srv0srv.h"
#include "srv0start.h"
#ifdef UNIV_DEBUG
#include "trx0purge.h"
#endif /* UNIV_DEBUG */
#include "trx0roll.h"
#include "trx0sys.h"
#include "trx0trx.h"
#include "trx0xa.h"
#include "ut0mem.h"
#include "row0ext.h"

enum_tx_isolation thd_get_trx_isolation(const THD* thd);

#include "ha_innodb.h"
#include "i_s.h"
#include "sync0sync.h"
#include "xtradb_i_s.h"

/* for ha_innopart, Native InnoDB Partitioning. */
#include "ha_innopart.h"

/** to protect innobase_open_files */
static mysql_mutex_t innobase_share_mutex;
/** to force correct commit order in binlog */
static ulong commit_threads = 0;
static mysql_cond_t commit_cond;
static mysql_mutex_t commit_cond_m;
static bool innodb_inited = 0;

#define INSIDE_HA_INNOBASE_CC

#define EQ_CURRENT_THD(thd) ((thd) == current_thd)

static struct handlerton* innodb_hton_ptr;

static const long AUTOINC_OLD_STYLE_LOCKING = 0;
static const long AUTOINC_NEW_STYLE_LOCKING = 1;
static const long AUTOINC_NO_LOCKING = 2;

static long innobase_log_buffer_size;
static long innobase_open_files;
static long innobase_autoinc_lock_mode;
static ulong innobase_commit_concurrency = 0;
static ulong innobase_read_io_threads;
static ulong innobase_write_io_threads;

static long long innobase_buffer_pool_size, innobase_log_file_size;

/** Percentage of the buffer pool to reserve for 'old' blocks.
Connected to buf_LRU_old_ratio. */
static uint innobase_old_blocks_pct;

/* The default values for the following char* start-up parameters
are determined in innobase_init below: */

static char*	innobase_data_home_dir			= NULL;
static char*	innobase_data_file_path			= NULL;
static char*	innobase_temp_data_file_path		= NULL;
static char*	innobase_file_format_name		= NULL;
static char*	innobase_change_buffering		= NULL;
static char*	innobase_enable_monitor_counter		= NULL;
static char*	innobase_disable_monitor_counter	= NULL;
static char*	innobase_reset_monitor_counter		= NULL;
static char*	innobase_reset_all_monitor_counter	= NULL;

/* The highest file format being used in the database. The value can be
set by user, however, it will be adjusted to the newer file format if
a table of such format is created/opened. */
char*	innobase_file_format_max		= NULL;

/** Default value of innodb_file_format */
static const char*	innodb_file_format_default	= "Barracuda";
/** Default value of innodb_file_format_max */
static const char*	innodb_file_format_max_default	= "Antelope";

static char*	innobase_file_flush_method		= NULL;

/* This variable can be set in the server configure file, specifying
stopword table to be used */
static char*	innobase_server_stopword_table		= NULL;

/* Below we have boolean-valued start-up parameters, and their default
values */

static ulong	innobase_fast_shutdown			= 1;
static my_bool	innobase_file_format_check		= TRUE;
static my_bool	innobase_use_doublewrite		= TRUE;
static my_bool	innobase_use_checksums			= TRUE;
static my_bool	innobase_locks_unsafe_for_binlog	= FALSE;
static my_bool	innobase_rollback_on_timeout		= FALSE;
static my_bool	innobase_create_status_file		= FALSE;
my_bool	innobase_stats_on_metadata		= TRUE;
static my_bool	innobase_large_prefix			= FALSE;
static my_bool	innodb_optimize_fulltext_only		= FALSE;

static char*	innodb_version_str = (char*) INNODB_VERSION_STR;

/** Note we cannot use rec_format_enum because we do not allow
COMPRESSED row format for innodb_default_row_format option. */
enum default_row_format_enum {
	DEFAULT_ROW_FORMAT_REDUNDANT = 0,
	DEFAULT_ROW_FORMAT_COMPACT = 1,
	DEFAULT_ROW_FORMAT_DYNAMIC = 2,
};

/** Return the InnoDB ROW_FORMAT enum value
@param[in]	row_format	row_format from "innodb_default_row_format"
@return InnoDB ROW_FORMAT value from rec_format_t enum. */
static
rec_format_t
get_row_format(
	ulong row_format)
{
	switch(row_format) {
	case DEFAULT_ROW_FORMAT_REDUNDANT:
		return(REC_FORMAT_REDUNDANT);
	case DEFAULT_ROW_FORMAT_COMPACT:
		return(REC_FORMAT_COMPACT);
	case DEFAULT_ROW_FORMAT_DYNAMIC:
		return(REC_FORMAT_DYNAMIC);
	default:
		ut_ad(0);
		return(REC_FORMAT_DYNAMIC);
	}
}

static ulong	innodb_default_row_format = DEFAULT_ROW_FORMAT_DYNAMIC;

#ifdef UNIV_DEBUG
/** Values for --innodb-debug-compress names. */
static const char* innodb_debug_compress_names[] = {
	"none",
	"zlib",
	"lz4",
	"lz4hc",
	NullS
};

/** Enumeration of --innodb-debug-compress */
static TYPELIB innodb_debug_compress_typelib = {
	array_elements(innodb_debug_compress_names) - 1,
	"innodb_debug_compress_typelib",
	innodb_debug_compress_names,
	NULL
};
#endif /* UNIV_DEBUG */

/** Possible values for system variable "innodb_stats_method". The values
are defined the same as its corresponding MyISAM system variable
"myisam_stats_method"(see "myisam_stats_method_names"), for better usability */
static const char* innodb_stats_method_names[] = {
	"nulls_equal",
	"nulls_unequal",
	"nulls_ignored",
	NullS
};

/** Used to define an enumerate type of the system variable innodb_stats_method.
This is the same as "myisam_stats_method_typelib" */
static TYPELIB innodb_stats_method_typelib = {
	array_elements(innodb_stats_method_names) - 1,
	"innodb_stats_method_typelib",
	innodb_stats_method_names,
	NULL
};

/** Possible values of the parameter innodb_checksum_algorithm */
static const char* innodb_checksum_algorithm_names[] = {
	"crc32",
	"strict_crc32",
	"innodb",
	"strict_innodb",
	"none",
	"strict_none",
	NullS
};

/** Used to define an enumerate type of the system variable
innodb_checksum_algorithm. */
static TYPELIB innodb_checksum_algorithm_typelib = {
	array_elements(innodb_checksum_algorithm_names) - 1,
	"innodb_checksum_algorithm_typelib",
	innodb_checksum_algorithm_names,
	NULL
};

/** Possible values for system variable "innodb_cleaner_lsn_age_factor".  */
static const char* innodb_cleaner_lsn_age_factor_names[] = {
	"legacy",
	"high_checkpoint",
	NullS
};

/** Enumeration for innodb_cleaner_lsn_age_factor.  */
static TYPELIB innodb_cleaner_lsn_age_factor_typelib = {
	array_elements(innodb_cleaner_lsn_age_factor_names) - 1,
	"innodb_cleaner_lsn_age_factor_typelib",
	innodb_cleaner_lsn_age_factor_names,
	NULL
};

/** Possible values for system variable "innodb_empty_free_list_algorithm".  */
static const char* innodb_empty_free_list_algorithm_names[] = {
	"legacy",
	"backoff",
	NullS
};

/** Enumeration for innodb_empty_free_list_algorithm.  */
static TYPELIB innodb_empty_free_list_algorithm_typelib = {
	array_elements(innodb_empty_free_list_algorithm_names) - 1,
	"innodb_empty_free_list_algorithm_typelib",
	innodb_empty_free_list_algorithm_names,
	NULL
};

/** Possible values for system variable "innodb_default_row_format". */
static const char* innodb_default_row_format_names[] = {
	"redundant",
	"compact",
	"dynamic",
	NullS
};

/** Used to define an enumerate type of the system variable
innodb_default_row_format. */
static TYPELIB innodb_default_row_format_typelib = {
	array_elements(innodb_default_row_format_names) - 1,
	"innodb_default_row_format_typelib",
	innodb_default_row_format_names,
	NULL
};

/* The following counter is used to convey information to InnoDB
about server activity: in case of normal DML ops it is not
sensible to call srv_active_wake_master_thread after each
operation, we only do it every INNOBASE_WAKE_INTERVAL'th step. */

#define INNOBASE_WAKE_INTERVAL	32
static ulong	innobase_active_counter	= 0;

static hash_table_t*	innobase_open_tables;

/** Allowed values of innodb_change_buffering */
static const char* innobase_change_buffering_values[IBUF_USE_COUNT] = {
	"none",		/* IBUF_USE_NONE */
	"inserts",	/* IBUF_USE_INSERT */
	"deletes",	/* IBUF_USE_DELETE_MARK */
	"changes",	/* IBUF_USE_INSERT_DELETE_MARK */
	"purges",	/* IBUF_USE_DELETE */
	"all"		/* IBUF_USE_ALL */
};


/* This tablespace name is reserved by InnoDB in order to explicitly
create a file_per_table tablespace for the table. */
const char reserved_file_per_table_space_name[] = "innodb_file_per_table";

/* This tablespace name is reserved by InnoDB for the system tablespace
which uses space_id 0 and stores extra types of system pages like UNDO
and doublewrite. */
const char reserved_system_space_name[] = "innodb_system";

/* This tablespace name is reserved by InnoDB for the predefined temporary
tablespace. */
const char reserved_temporary_space_name[] = "innodb_temporary";

/* Call back function array defined by MySQL and used to
retrieve FTS results. */
const struct _ft_vft ft_vft_result = {NULL,
				      innobase_fts_find_ranking,
				      innobase_fts_close_ranking,
				      innobase_fts_retrieve_ranking,
				      NULL};

const struct _ft_vft_ext ft_vft_ext_result = {innobase_fts_get_version,
					      innobase_fts_flags,
					      innobase_fts_retrieve_docid,
					      innobase_fts_count_matches};

#ifdef HAVE_PSI_INTERFACE
# define PSI_KEY(n) {&n##_key, #n, 0}
/* All RWLOCK used in Innodb are SX-locks */
# define PSI_RWLOCK_KEY(n) {&n##_key, #n, PSI_RWLOCK_FLAG_SX}

/* Keys to register pthread mutexes/cond in the current file with
performance schema */
static mysql_pfs_key_t	innobase_share_mutex_key;
static mysql_pfs_key_t	commit_cond_mutex_key;
static mysql_pfs_key_t	commit_cond_key;

static PSI_mutex_info	all_pthread_mutexes[] = {
	PSI_KEY(commit_cond_mutex),
	PSI_KEY(innobase_share_mutex)
};

static PSI_cond_info	all_innodb_conds[] = {
	PSI_KEY(commit_cond)
};

# ifdef UNIV_PFS_MUTEX
/* all_innodb_mutexes array contains mutexes that are
performance schema instrumented if "UNIV_PFS_MUTEX"
is defined */
static PSI_mutex_info all_innodb_mutexes[] = {
	PSI_KEY(autoinc_mutex),
#  ifndef PFS_SKIP_BUFFER_MUTEX_RWLOCK
	PSI_KEY(buffer_block_mutex),
#  endif /* !PFS_SKIP_BUFFER_MUTEX_RWLOCK */
	PSI_KEY(buf_pool_flush_state_mutex),
	PSI_KEY(buf_pool_LRU_list_mutex),
	PSI_KEY(buf_pool_free_list_mutex),
	PSI_KEY(buf_pool_zip_free_mutex),
	PSI_KEY(buf_pool_zip_hash_mutex),
	PSI_KEY(buf_pool_zip_mutex),
	PSI_KEY(cache_last_read_mutex),
	PSI_KEY(dict_foreign_err_mutex),
	PSI_KEY(dict_sys_mutex),
	PSI_KEY(recalc_pool_mutex),
	PSI_KEY(file_format_max_mutex),
	PSI_KEY(fil_system_mutex),
	PSI_KEY(flush_list_mutex),
	PSI_KEY(fts_bg_threads_mutex),
	PSI_KEY(fts_delete_mutex),
	PSI_KEY(fts_optimize_mutex),
	PSI_KEY(fts_doc_id_mutex),
	PSI_KEY(log_flush_order_mutex),
	PSI_KEY(hash_table_mutex),
	PSI_KEY(ibuf_bitmap_mutex),
	PSI_KEY(ibuf_mutex),
	PSI_KEY(ibuf_pessimistic_insert_mutex),
	PSI_KEY(log_bmp_sys_mutex),
	PSI_KEY(log_sys_mutex),
	PSI_KEY(mutex_list_mutex),
	PSI_KEY(page_zip_stat_per_index_mutex),
	PSI_KEY(purge_sys_pq_mutex),
	PSI_KEY(recv_sys_mutex),
	PSI_KEY(redo_rseg_mutex),
	PSI_KEY(noredo_rseg_mutex),
#  ifdef UNIV_DEBUG
	PSI_KEY(rw_lock_debug_mutex),
#  endif /* UNIV_DEBUG */
	PSI_KEY(rw_lock_list_mutex),
	PSI_KEY(rw_lock_mutex),
	PSI_KEY(srv_dict_tmpfile_mutex),
	PSI_KEY(srv_innodb_monitor_mutex),
	PSI_KEY(srv_misc_tmpfile_mutex),
	PSI_KEY(srv_monitor_file_mutex),
#  ifdef UNIV_DEBUG
	PSI_KEY(sync_thread_mutex),
#  endif /* UNIV_DEBUG */
	PSI_KEY(buf_dblwr_mutex),
	PSI_KEY(trx_undo_mutex),
	PSI_KEY(trx_pool_mutex),
	PSI_KEY(trx_pool_manager_mutex),
	PSI_KEY(srv_sys_mutex),
	PSI_KEY(lock_mutex),
	PSI_KEY(lock_wait_mutex),
	PSI_KEY(trx_mutex),
	PSI_KEY(srv_threads_mutex),
#  ifndef PFS_SKIP_EVENT_MUTEX
	PSI_KEY(event_mutex),
#  endif /* PFS_SKIP_EVENT_MUTEX */
	PSI_KEY(rtr_active_mutex),
	PSI_KEY(rtr_match_mutex),
	PSI_KEY(rtr_path_mutex),
	PSI_KEY(rtr_ssn_mutex),
	PSI_KEY(trx_sys_mutex),
	PSI_KEY(zip_pad_mutex),
	PSI_KEY(master_key_id_mutex),
};
# endif /* UNIV_PFS_MUTEX */

# ifdef UNIV_PFS_RWLOCK
/* all_innodb_rwlocks array contains rwlocks that are
performance schema instrumented if "UNIV_PFS_RWLOCK"
is defined */
static PSI_rwlock_info all_innodb_rwlocks[] = {
	PSI_RWLOCK_KEY(btr_search_latch),
#  ifndef PFS_SKIP_BUFFER_MUTEX_RWLOCK
	PSI_RWLOCK_KEY(buf_block_lock),
#  endif /* !PFS_SKIP_BUFFER_MUTEX_RWLOCK */
#  ifdef UNIV_DEBUG
	PSI_RWLOCK_KEY(buf_block_debug_latch),
#  endif /* UNIV_DEBUG */
	PSI_RWLOCK_KEY(dict_operation_lock),
	PSI_RWLOCK_KEY(fil_space_latch),
	PSI_RWLOCK_KEY(checkpoint_lock),
	PSI_RWLOCK_KEY(fts_cache_rw_lock),
	PSI_RWLOCK_KEY(fts_cache_init_rw_lock),
	PSI_RWLOCK_KEY(trx_i_s_cache_lock),
	PSI_RWLOCK_KEY(trx_purge_latch),
	PSI_RWLOCK_KEY(index_tree_rw_lock),
	PSI_RWLOCK_KEY(index_online_log),
	PSI_RWLOCK_KEY(dict_table_stats),
	PSI_RWLOCK_KEY(hash_table_locks),
#  ifdef UNIV_DEBUG
	PSI_RWLOCK_KEY(buf_chunk_map_latch)
#  endif /* UNIV_DEBUG */
};
# endif /* UNIV_PFS_RWLOCK */

# ifdef UNIV_PFS_THREAD
/* all_innodb_threads array contains threads that are
performance schema instrumented if "UNIV_PFS_THREAD"
is defined */
static PSI_thread_info	all_innodb_threads[] = {
	PSI_KEY(buf_dump_thread),
	PSI_KEY(dict_stats_thread),
	PSI_KEY(io_handler_thread),
	PSI_KEY(io_ibuf_thread),
	PSI_KEY(io_log_thread),
	PSI_KEY(io_read_thread),
	PSI_KEY(io_write_thread),
	PSI_KEY(page_cleaner_thread),
	PSI_KEY(buf_lru_manager_thread),
	PSI_KEY(srv_error_monitor_thread),
	PSI_KEY(srv_lock_timeout_thread),
	PSI_KEY(srv_master_thread),
	PSI_KEY(srv_monitor_thread),
	PSI_KEY(srv_purge_thread),
	PSI_KEY(srv_log_tracking_thread),
	PSI_KEY(srv_worker_thread),
	PSI_KEY(trx_rollback_clean_thread),
};
# endif /* UNIV_PFS_THREAD */

# ifdef UNIV_PFS_IO
/* all_innodb_files array contains the type of files that are
performance schema instrumented if "UNIV_PFS_IO" is defined */
static PSI_file_info	all_innodb_files[] = {
	PSI_KEY(innodb_bmp_file),
	PSI_KEY(innodb_data_file),
	PSI_KEY(innodb_log_file),
	PSI_KEY(innodb_temp_file),
	PSI_KEY(innodb_parallel_dblwrite_file)
};
# endif /* UNIV_PFS_IO */
#endif /* HAVE_PSI_INTERFACE */

/** Set up InnoDB API callback function array */
ib_cb_t innodb_api_cb[] = {
	(ib_cb_t) ib_cursor_open_table,
	(ib_cb_t) ib_cursor_read_row,
	(ib_cb_t) ib_cursor_insert_row,
	(ib_cb_t) ib_cursor_delete_row,
	(ib_cb_t) ib_cursor_update_row,
	(ib_cb_t) ib_cursor_moveto,
	(ib_cb_t) ib_cursor_first,
	(ib_cb_t) ib_cursor_next,
	(ib_cb_t) ib_cursor_set_match_mode,
	(ib_cb_t) ib_sec_search_tuple_create,
	(ib_cb_t) ib_clust_read_tuple_create,
	(ib_cb_t) ib_tuple_delete,
	(ib_cb_t) ib_tuple_read_u8,
	(ib_cb_t) ib_tuple_read_u16,
	(ib_cb_t) ib_tuple_read_u32,
	(ib_cb_t) ib_tuple_read_u64,
	(ib_cb_t) ib_tuple_read_i8,
	(ib_cb_t) ib_tuple_read_i16,
	(ib_cb_t) ib_tuple_read_i32,
	(ib_cb_t) ib_tuple_read_i64,
	(ib_cb_t) ib_tuple_get_n_cols,
	(ib_cb_t) ib_col_set_value,
	(ib_cb_t) ib_col_get_value,
	(ib_cb_t) ib_col_get_meta,
	(ib_cb_t) ib_trx_begin,
	(ib_cb_t) ib_trx_commit,
	(ib_cb_t) ib_trx_rollback,
	(ib_cb_t) ib_trx_start,
	(ib_cb_t) ib_trx_release,
	(ib_cb_t) ib_cursor_lock,
	(ib_cb_t) ib_cursor_close,
	(ib_cb_t) ib_cursor_new_trx,
	(ib_cb_t) ib_cursor_reset,
	(ib_cb_t) ib_col_get_name,
	(ib_cb_t) ib_table_truncate,
	(ib_cb_t) ib_cursor_open_index_using_name,
	(ib_cb_t) ib_cfg_get_cfg,
	(ib_cb_t) ib_cursor_set_memcached_sync,
	(ib_cb_t) ib_cursor_set_cluster_access,
	(ib_cb_t) ib_cursor_commit_trx,
	(ib_cb_t) ib_cfg_trx_level,
	(ib_cb_t) ib_tuple_get_n_user_cols,
	(ib_cb_t) ib_cursor_set_lock_mode,
	(ib_cb_t) ib_get_idx_field_name,
	(ib_cb_t) ib_trx_get_start_time,
	(ib_cb_t) ib_cfg_bk_commit_interval,
	(ib_cb_t) ib_ut_strerr,
	(ib_cb_t) ib_cursor_stmt_begin,
	(ib_cb_t) ib_trx_read_only,
	(ib_cb_t) ib_is_virtual_table
};

/******************************************************************//**
Function used to loop a thread (for debugging/instrumentation
purpose). */
void
srv_debug_loop(void)
/*================*/
{
        ibool set = TRUE;

        while (set) {
                os_thread_yield();
        }
}

/******************************************************************//**
Debug function used to read a MBR data */

#ifdef UNIV_DEBUG
void
srv_mbr_debug(const byte* data)
{
	double a, b, c , d;
        a = mach_double_read(data);
        data += sizeof(double);
        b = mach_double_read(data);
        data += sizeof(double);
        c = mach_double_read(data);
        data += sizeof(double);
        d = mach_double_read(data);
	ut_ad(a && b && c &&d);
}
#endif
/*************************************************************//**
Check whether valid argument given to innodb_ft_*_stopword_table.
This function is registered as a callback with MySQL.
@return 0 for valid stopword table */
static
int
innodb_stopword_table_validate(
/*===========================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value);	/*!< in: incoming string */

/************************************************************//**
Synchronously read and parse the redo log up to the last
checkpoint to write the changed page bitmap.
@return 0 to indicate success.  Current implementation cannot fail. */
static
my_bool
innobase_flush_changed_page_bitmaps();
/*==================================*/

/************************************************************//**
Delete all the bitmap files for data less than the specified LSN.
If called with lsn == 0 (i.e. set by RESET request) or
IB_ULONGLONG_MAX, restart the bitmap file sequence, otherwise
continue it.
@return 0 to indicate success, 1 for failure. */
static
my_bool
innobase_purge_changed_page_bitmaps(
/*================================*/
	ulonglong lsn);	/*!< in: LSN to purge files up to */

/** Validate passed-in "value" is a valid directory name.
This function is registered as a callback with MySQL.
@param[in,out]	thd	thread handle
@param[in]	var	pointer to system variable
@param[out]	save	immediate result for update
@param[in]	value	incoming string
@return 0 for valid name */
static
int
innodb_tmpdir_validate(
	THD*				thd,
	struct st_mysql_sys_var*	var,
	void*				save,
	struct st_mysql_value*		value)
{

	char*	alter_tmp_dir;
	char*	innodb_tmp_dir;
	char	buff[OS_FILE_MAX_PATH];
	int	len = sizeof(buff);
	char	tmp_abs_path[FN_REFLEN + 2];

	ut_ad(save != NULL);
	ut_ad(value != NULL);

	if (check_global_access(thd, FILE_ACL)) {
		push_warning_printf(
			thd, Sql_condition::SL_WARNING,
			ER_WRONG_ARGUMENTS,
			"InnoDB: FILE Permissions required");
		*static_cast<const char**>(save) = NULL;
		return(1);
	}

	alter_tmp_dir = (char*) value->val_str(value, buff, &len);

	if (!alter_tmp_dir) {
		*static_cast<const char**>(save) = alter_tmp_dir;
		return(0);
	}

	if (strlen(alter_tmp_dir) > FN_REFLEN) {
		push_warning_printf(
			thd, Sql_condition::SL_WARNING,
			ER_WRONG_ARGUMENTS,
			"Path length should not exceed %d bytes", FN_REFLEN);
		*static_cast<const char**>(save) = NULL;
		return(1);
	}

	os_normalize_path(alter_tmp_dir);
	my_realpath(tmp_abs_path, alter_tmp_dir, 0);
	size_t  tmp_abs_len = strlen(tmp_abs_path);

	if (my_access(tmp_abs_path, F_OK)) {

		push_warning_printf(
			thd, Sql_condition::SL_WARNING,
			ER_WRONG_ARGUMENTS,
			"InnoDB: Path doesn't exist.");
		*static_cast<const char**>(save) = NULL;
		return(1);
	} else if (my_access(tmp_abs_path, R_OK | W_OK)) {
		push_warning_printf(
			thd, Sql_condition::SL_WARNING,
			ER_WRONG_ARGUMENTS,
			"InnoDB: Server doesn't have permission in "
			"the given location.");
		*static_cast<const char**>(save) = NULL;
		return(1);
	}

	MY_STAT stat_info_dir;

	if (my_stat(tmp_abs_path, &stat_info_dir, MYF(0))) {
		if ((stat_info_dir.st_mode & S_IFDIR) != S_IFDIR) {

			push_warning_printf(
				thd, Sql_condition::SL_WARNING,
				ER_WRONG_ARGUMENTS,
				"Given path is not a directory. ");
			*static_cast<const char**>(save) = NULL;
			return(1);
		}
	}

	if (!is_mysql_datadir_path(tmp_abs_path)) {

		push_warning_printf(
			thd, Sql_condition::SL_WARNING,
			ER_WRONG_ARGUMENTS,
			"InnoDB: Path location should not be same as "
			"mysql data directory location.");
		*static_cast<const char**>(save) = NULL;
		return(1);
	}

	innodb_tmp_dir = static_cast<char*>(
		thd_memdup(thd, tmp_abs_path, tmp_abs_len + 1));
	*static_cast<const char**>(save) = innodb_tmp_dir;
	return(0);
}

/******************************************************************//**
Maps a MySQL trx isolation level code to the InnoDB isolation level code
@return	InnoDB isolation level */
static inline
ulint
innobase_map_isolation_level(
/*=========================*/
	enum_tx_isolation	iso);	/*!< in: MySQL isolation level code */

/** Gets field offset for a field in a table.
@param[in]	table	MySQL table object
@param[in]	field	MySQL field object
@return offset */
static inline
uint
get_field_offset(
	const TABLE*	table,
	const Field*	field);

static const char innobase_hton_name[]= "InnoDB";

static const char*	deprecated_innodb_support_xa
	= "Using innodb_support_xa is deprecated and the"
	" parameter may be removed in future releases.";
static const char*	deprecated_innodb_support_xa_off
	= "Using innodb_support_xa is deprecated and the"
	" parameter may be removed in future releases."
	" Only innodb_support_xa=ON is allowed.";

/** Update the session variable innodb_support_xa.
@param[in]	thd	current session
@param[in]	var	the system variable innodb_support_xa
@param[in,out]	var_ptr	the contents of the variable
@param[in]	save	the to-be-updated value */
static
void
innodb_support_xa_update(
	THD*				thd,
	struct st_mysql_sys_var*	var,
	void*				var_ptr,
	const void*			save)
{
	my_bool	innodb_support_xa = *static_cast<const my_bool*>(save);
	push_warning(thd, Sql_condition::SL_WARNING,
		     HA_ERR_WRONG_COMMAND,
		     innodb_support_xa
		     ? deprecated_innodb_support_xa
		     : deprecated_innodb_support_xa_off);
}

static MYSQL_THDVAR_BOOL(support_xa, PLUGIN_VAR_OPCMDARG,
  "Enable InnoDB support for the XA two-phase commit",
  /* check_func */ NULL, innodb_support_xa_update,
  /* default */ TRUE);

static MYSQL_THDVAR_BOOL(table_locks, PLUGIN_VAR_OPCMDARG,
  "Enable InnoDB locking in LOCK TABLES",
  /* check_func */ NULL, /* update_func */ NULL,
  /* default */ TRUE);

static MYSQL_THDVAR_BOOL(strict_mode, PLUGIN_VAR_OPCMDARG,
  "Use strict mode when evaluating create options.",
  NULL, NULL, TRUE);

static MYSQL_THDVAR_BOOL(ft_enable_stopword, PLUGIN_VAR_OPCMDARG,
  "Create FTS index with stopword.",
  NULL, NULL,
  /* default */ TRUE);

static MYSQL_THDVAR_ULONG(lock_wait_timeout, PLUGIN_VAR_RQCMDARG,
  "Timeout in seconds an InnoDB transaction may wait for a lock before being rolled back. Values above 100000000 disable the timeout.",
  NULL, NULL, 50, 1, 1024 * 1024 * 1024, 0);

static MYSQL_THDVAR_STR(ft_user_stopword_table,
  PLUGIN_VAR_OPCMDARG|PLUGIN_VAR_MEMALLOC,
  "User supplied stopword table name, effective in the session level.",
  innodb_stopword_table_validate, NULL, NULL);

static MYSQL_THDVAR_ULONG(flush_log_at_trx_commit, PLUGIN_VAR_OPCMDARG,
  "Set to 0 (write and flush once per second),"
  " 1 (write and flush at each commit)"
  " or 2 (write at commit, flush once per second).",
  NULL, NULL, 1, 0, 2, 0);

static MYSQL_THDVAR_STR(tmpdir,
  PLUGIN_VAR_OPCMDARG|PLUGIN_VAR_MEMALLOC,
  "Directory for temporary non-tablespace files.",
  innodb_tmpdir_validate, NULL, NULL);

static SHOW_VAR innodb_status_variables[]= {
  {"background_log_sync",
  (char*) &export_vars.innodb_background_log_sync,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_dump_status",
  (char*) &export_vars.innodb_buffer_pool_dump_status,	  SHOW_CHAR, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_load_status",
  (char*) &export_vars.innodb_buffer_pool_load_status,	  SHOW_CHAR, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_resize_status",
  (char*) &export_vars.innodb_buffer_pool_resize_status,  SHOW_CHAR, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_pages_data",
  (char*) &export_vars.innodb_buffer_pool_pages_data,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_bytes_data",
  (char*) &export_vars.innodb_buffer_pool_bytes_data,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_pages_dirty",
  (char*) &export_vars.innodb_buffer_pool_pages_dirty,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_bytes_dirty",
  (char*) &export_vars.innodb_buffer_pool_bytes_dirty,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_pages_flushed",
  (char*) &export_vars.innodb_buffer_pool_pages_flushed,  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_pages_free",
  (char*) &export_vars.innodb_buffer_pool_pages_free,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
#ifdef UNIV_DEBUG
  {"buffer_pool_pages_latched",
  (char*) &export_vars.innodb_buffer_pool_pages_latched,  SHOW_LONG, SHOW_SCOPE_GLOBAL},
#endif /* UNIV_DEBUG */
  {"buffer_pool_pages_LRU_flushed",
  (char*) &export_vars.innodb_buffer_pool_pages_LRU_flushed,SHOW_LONG,SHOW_SCOPE_GLOBAL},
  {"buffer_pool_pages_made_not_young",
  (char*) &export_vars.innodb_buffer_pool_pages_made_not_young, SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_pages_made_young",
  (char*) &export_vars.innodb_buffer_pool_pages_made_young, SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_pages_misc",
  (char*) &export_vars.innodb_buffer_pool_pages_misc,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_pages_old",
  (char*) &export_vars.innodb_buffer_pool_pages_old,	  SHOW_LONG, SHOW_SCOPE_GLOBAL} ,
  {"buffer_pool_pages_total",
  (char*) &export_vars.innodb_buffer_pool_pages_total,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_read_ahead_rnd",
  (char*) &export_vars.innodb_buffer_pool_read_ahead_rnd, SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_read_ahead",
  (char*) &export_vars.innodb_buffer_pool_read_ahead,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_read_ahead_evicted",
  (char*) &export_vars.innodb_buffer_pool_read_ahead_evicted, SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_read_requests",
  (char*) &export_vars.innodb_buffer_pool_read_requests,  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_reads",
  (char*) &export_vars.innodb_buffer_pool_reads,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_wait_free",
  (char*) &export_vars.innodb_buffer_pool_wait_free,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"buffer_pool_write_requests",
  (char*) &export_vars.innodb_buffer_pool_write_requests, SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"checkpoint_age",
  (char*) &export_vars.innodb_checkpoint_age,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"checkpoint_max_age",
  (char*) &export_vars.innodb_checkpoint_max_age,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"data_fsyncs",
  (char*) &export_vars.innodb_data_fsyncs,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"data_pending_fsyncs",
  (char*) &export_vars.innodb_data_pending_fsyncs,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"data_pending_reads",
  (char*) &export_vars.innodb_data_pending_reads,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"data_pending_writes",
  (char*) &export_vars.innodb_data_pending_writes,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"data_read",
  (char*) &export_vars.innodb_data_read,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"data_reads",
  (char*) &export_vars.innodb_data_reads,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"data_writes",
  (char*) &export_vars.innodb_data_writes,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"data_written",
  (char*) &export_vars.innodb_data_written,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"dblwr_pages_written",
  (char*) &export_vars.innodb_dblwr_pages_written,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"dblwr_writes",
  (char*) &export_vars.innodb_dblwr_writes,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"ibuf_free_list",
  (char*) &export_vars.innodb_ibuf_free_list,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"ibuf_segment_size",
  (char*) &export_vars.innodb_ibuf_segment_size,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"log_waits",
  (char*) &export_vars.innodb_log_waits,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"log_write_requests",
  (char*) &export_vars.innodb_log_write_requests,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"log_writes",
  (char*) &export_vars.innodb_log_writes,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"lsn_current",
  (char*) &export_vars.innodb_lsn_current,		  SHOW_LONGLONG, SHOW_SCOPE_GLOBAL},
  {"lsn_flushed",
  (char*) &export_vars.innodb_lsn_flushed,		  SHOW_LONGLONG, SHOW_SCOPE_GLOBAL},
  {"lsn_last_checkpoint",
  (char*) &export_vars.innodb_lsn_last_checkpoint,	  SHOW_LONGLONG, SHOW_SCOPE_GLOBAL},
  {"master_thread_active_loops",
  (char*) &export_vars.innodb_master_thread_active_loops, SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"master_thread_idle_loops",
  (char*) &export_vars.innodb_master_thread_idle_loops,   SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"max_trx_id",
  (char*) &export_vars.innodb_max_trx_id,		  SHOW_LONGLONG, SHOW_SCOPE_GLOBAL},
  {"mem_adaptive_hash",
  (char*) &export_vars.innodb_mem_adaptive_hash,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"mem_dictionary",
  (char*) &export_vars.innodb_mem_dictionary,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"oldest_view_low_limit_trx_id",
  (char*) &export_vars.innodb_oldest_view_low_limit_trx_id, SHOW_LONGLONG, SHOW_SCOPE_GLOBAL},
  {"os_log_fsyncs",
  (char*) &export_vars.innodb_os_log_fsyncs,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"os_log_pending_fsyncs",
  (char*) &export_vars.innodb_os_log_pending_fsyncs,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"os_log_pending_writes",
  (char*) &export_vars.innodb_os_log_pending_writes,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"os_log_written",
  (char*) &export_vars.innodb_os_log_written,		  SHOW_LONGLONG, SHOW_SCOPE_GLOBAL},
  {"page_size",
  (char*) &export_vars.innodb_page_size,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"pages_created",
  (char*) &export_vars.innodb_pages_created,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"pages_read",
  (char*) &export_vars.innodb_pages_read,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"pages_written",
  (char*) &export_vars.innodb_pages_written,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"purge_trx_id",
  (char*) &export_vars.innodb_purge_trx_id,		  SHOW_LONGLONG, SHOW_SCOPE_GLOBAL},
  {"purge_undo_no",
  (char*) &export_vars.innodb_purge_undo_no,		  SHOW_LONGLONG, SHOW_SCOPE_GLOBAL},
  {"row_lock_current_waits",
  (char*) &export_vars.innodb_row_lock_current_waits,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"row_lock_time",
  (char*) &export_vars.innodb_row_lock_time,		  SHOW_LONGLONG, SHOW_SCOPE_GLOBAL},
  {"row_lock_time_avg",
  (char*) &export_vars.innodb_row_lock_time_avg,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"row_lock_time_max",
  (char*) &export_vars.innodb_row_lock_time_max,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"row_lock_waits",
  (char*) &export_vars.innodb_row_lock_waits,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"rows_deleted",
  (char*) &export_vars.innodb_rows_deleted,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"rows_inserted",
  (char*) &export_vars.innodb_rows_inserted,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"rows_read",
  (char*) &export_vars.innodb_rows_read,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"rows_updated",
  (char*) &export_vars.innodb_rows_updated,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"num_open_files",
  (char*) &export_vars.innodb_num_open_files,		  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"truncated_status_writes",
  (char*) &export_vars.innodb_truncated_status_writes,	  SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"available_undo_logs",
  (char*) &export_vars.innodb_available_undo_logs,        SHOW_LONG, SHOW_SCOPE_GLOBAL},
#ifdef UNIV_DEBUG
  {"purge_trx_id_age",
  (char*) &export_vars.innodb_purge_trx_id_age,           SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"purge_view_trx_id_age",
  (char*) &export_vars.innodb_purge_view_trx_id_age,      SHOW_LONG, SHOW_SCOPE_GLOBAL},
  {"ahi_drop_lookups",
  (char*) &export_vars.innodb_ahi_drop_lookups,           SHOW_LONG, SHOW_SCOPE_GLOBAL},
#endif /* UNIV_DEBUG */
  {NullS, NullS, SHOW_LONG, SHOW_SCOPE_GLOBAL}
};

/************************************************************************//**
Handling the shared INNOBASE_SHARE structure that is needed to provide table
locking. Register the table name if it doesn't exist in the hash table. */
static
INNOBASE_SHARE*
get_share(
/*======*/
	const char*	table_name);	/*!< in: table to lookup */

/************************************************************************//**
Free the shared object that was registered with get_share(). */
static
void
free_share(
/*=======*/
	INNOBASE_SHARE*	share);		/*!< in/own: share to free */

/*****************************************************************//**
Frees a possible InnoDB trx object associated with the current THD.
@return 0 or error number */
static
int
innobase_close_connection(
/*======================*/
	handlerton*	hton,		/*!< in/out: InnoDB handlerton */
	THD*		thd);		/*!< in: MySQL thread handle for
					which to close the connection */

/*****************************************************************//**
Cancel any pending lock request associated with the current THD. */
static
void
innobase_kill_connection(
/*=====================*/
	handlerton*	hton,		/*!< in/out: InnoDB handlerton */
	THD*		thd);		/*!< in: MySQL thread handle for
					which to close the connection */

/*****************************************************************//**
Commits a transaction in an InnoDB database or marks an SQL statement
ended.
@return 0 */
static
int
innobase_commit(
/*============*/
	handlerton*	hton,		/*!< in/out: InnoDB handlerton */
	THD*		thd,		/*!< in: MySQL thread handle of the
					user for whom the transaction should
					be committed */
	bool		commit_trx);	/*!< in: true - commit transaction
					false - the current SQL statement
					ended */

/*****************************************************************//**
Rolls back a transaction to a savepoint.
@return 0 if success, HA_ERR_NO_SAVEPOINT if no savepoint with the
given name */
static
int
innobase_rollback(
/*==============*/
	handlerton*	hton,		/*!< in/out: InnoDB handlerton */
	THD*		thd,		/*!< in: handle to the MySQL thread
					of the user whose transaction should
					be rolled back */
	bool		rollback_trx);	/*!< in: TRUE - rollback entire
					transaction FALSE - rollback the current
					statement only */

/*****************************************************************//**
Rolls back a transaction to a savepoint.
@return 0 if success, HA_ERR_NO_SAVEPOINT if no savepoint with the
given name */
static
int
innobase_rollback_to_savepoint(
/*===========================*/
	handlerton*	hton,		/*!< in/out: InnoDB handlerton */
	THD*		thd,		/*!< in: handle to the MySQL thread of
					the user whose XA transaction should
					be rolled back to savepoint */
	void*		savepoint);	/*!< in: savepoint data */

/*****************************************************************//**
Check whether innodb state allows to safely release MDL locks after
rollback to savepoint.
@return true if it is safe, false if its not safe. */
static
bool
innobase_rollback_to_savepoint_can_release_mdl(
/*===========================================*/
	handlerton*	hton,		/*!< in/out: InnoDB handlerton */
	THD*		thd);		/*!< in: handle to the MySQL thread of
					the user whose XA transaction should
					be rolled back to savepoint */

/*****************************************************************//**
Sets a transaction savepoint.
@return always 0, that is, always succeeds */
static
int
innobase_savepoint(
/*===============*/
	handlerton*	hton,		/*!< in/out: InnoDB handlerton */
	THD*		thd,		/*!< in: handle to the MySQL thread of
					the user's XA transaction for which
					we need to take a savepoint */
	void*		savepoint);	/*!< in: savepoint data */

/*****************************************************************//**
Release transaction savepoint name.
@return 0 if success, HA_ERR_NO_SAVEPOINT if no savepoint with the
given name */
static
int
innobase_release_savepoint(
/*=======================*/
	handlerton*	hton,		/*!< in/out: handlerton for InnoDB */
	THD*		thd,		/*!< in: handle to the MySQL thread
					of the user whose transaction's
					savepoint should be released */
	void*		savepoint);	/*!< in: savepoint data */

/************************************************************************//**
Function for constructing an InnoDB table handler instance. */
static
handler*
innobase_create_handler(
/*====================*/
	handlerton*	hton,		/*!< in/out: handlerton for InnoDB */
	TABLE_SHARE*	table,
	MEM_ROOT*	mem_root);

/** @brief Initialize the default value of innodb_commit_concurrency.

Once InnoDB is running, the innodb_commit_concurrency must not change
from zero to nonzero. (Bug #42101)

The initial default value is 0, and without this extra initialization,
SET GLOBAL innodb_commit_concurrency=DEFAULT would set the parameter
to 0, even if it was initially set to nonzero at the command line
or configuration file. */
static
void
innobase_commit_concurrency_init_default();
/*=======================================*/

/** @brief Initialize the default and max value of innodb_undo_logs.

Once InnoDB is running, the default value and the max value of
innodb_undo_logs must be equal to the available undo logs,
given by srv_available_undo_logs. */
static
void
innobase_undo_logs_init_default_max();
/*==================================*/

/************************************************************//**
Validate the file format name and return its corresponding id.
@return valid file format id */
static
uint
innobase_file_format_name_lookup(
/*=============================*/
	const char*	format_name);	/*!< in: pointer to file format
					name */
/************************************************************//**
Validate the file format check config parameters, as a side effect it
sets the srv_max_file_format_at_startup variable.
@return the format_id if valid config value, otherwise, return -1 */
static
int
innobase_file_format_validate_and_set(
/*==================================*/
	const char*	format_max);	/*!< in: parameter value */

/*******************************************************************//**
This function is used to prepare an X/Open XA distributed transaction.
@return 0 or error number */
static
int
innobase_xa_prepare(
/*================*/
	handlerton*	hton,		/*!< in: InnoDB handlerton */
	THD*		thd,		/*!< in: handle to the MySQL thread of
					the user whose XA transaction should
					be prepared */
	bool		all);		/*!< in: true - prepare transaction
					false - the current SQL statement
					ended */
/*******************************************************************//**
This function is used to recover X/Open XA distributed transactions.
@return number of prepared transactions stored in xid_list */
static
int
innobase_xa_recover(
/*================*/
	handlerton*	hton,		/*!< in: InnoDB handlerton */
	XID*		xid_list,	/*!< in/out: prepared transactions */
	uint		len);		/*!< in: number of slots in xid_list */
/*******************************************************************//**
This function is used to commit one X/Open XA distributed transaction
which is in the prepared state
@return 0 or error number */
static
int
innobase_commit_by_xid(
/*===================*/
	handlerton*	hton,		/*!< in: InnoDB handlerton */
	XID*		xid);		/*!< in: X/Open XA transaction
					identification */
/*******************************************************************//**
This function is used to rollback one X/Open XA distributed transaction
which is in the prepared state
@return 0 or error number */
static
int
innobase_rollback_by_xid(
/*=====================*/
	handlerton*	hton,		/*!< in: InnoDB handlerton */
	XID*		xid);		/*!< in: X/Open XA transaction
					identification */

/** This API handles CREATE, ALTER & DROP commands for InnoDB tablespaces.
@param[in]	hton		Handlerton of InnoDB
@param[in]	thd		Connection
@param[in]	alter_info	Describies the command and how to do it.
@return MySQL error code*/
static
int
innobase_alter_tablespace(
	handlerton*		hton,
	THD*			thd,
	st_alter_tablespace*	alter_info);

/** Remove all tables in the named database inside InnoDB.
@param[in]	hton	handlerton from InnoDB
@param[in]	path	Database path; Inside InnoDB the name of the last
directory in the path is used as the database name.
For example, in 'mysql/data/test' the database name is 'test'. */
static
void
innobase_drop_database(
	handlerton*	hton,
	char*		path);

/*******************************************************************//**
Closes an InnoDB database. */
static
int
innobase_end(
/*=========*/
	handlerton*		hton,	/* in: InnoDB handlerton */
	ha_panic_function	type);

/*****************************************************************//**
Stores the current binlog coordinates in the trx system header. */
static
int
innobase_store_binlog_info(
/*=======================*/
	handlerton*	hton,	/*!< in: InnoDB handlerton */
	THD*		thd);	/*!< in: MySQL thread handle */

/*****************************************************************//**
Creates an InnoDB transaction struct for the thd if it does not yet have one.
Starts a new InnoDB transaction if a transaction is not yet started. And
assigns a new snapshot for a consistent read if the transaction does not yet
have one.
@return 0 */
static
int
innobase_start_trx_and_assign_read_view(
/*====================================*/
	handlerton*	hton,		/* in: InnoDB handlerton */
	THD*		thd);		/* in: MySQL thread handle of the
					user for whom the transaction should
					be committed */

/*****************************************************************//**
Creates an InnoDB transaction struct for the thd if it does not yet have one.
Starts a new InnoDB transaction if a transaction is not yet started. And
clones snapshot for a consistent read from another session, if it has one.
@return	0 */
static
int
innobase_start_trx_and_clone_read_view(
/*====================================*/
	handlerton*	hton,		/* in: Innodb handlerton */
	THD*		thd,		/* in: MySQL thread handle of the
					user for whom the transaction should
					be committed */
	THD*		from_thd);	/* in: MySQL thread handle of the
					user session from which the consistent
					read should be cloned */

/** Flush InnoDB redo logs to the file system.
@param[in]	hton			InnoDB handlerton
@param[in]	binlog_group_flush	true if we got invoked by binlog
group commit during flush stage, false in other cases.
@return false */
static
bool
innobase_flush_logs(
	handlerton*	hton,
	bool		binlog_group_flush);

/************************************************************************//**
Implements the SHOW ENGINE INNODB STATUS command. Sends the output of the
InnoDB Monitor to the client.
@return 0 on success */
static
int
innodb_show_status(
/*===============*/
	handlerton*	hton,		/*!< in: the innodb handlerton */
	THD*		thd,		/*!< in: the MySQL query thread of
					the caller */
	stat_print_fn*	stat_print);
/************************************************************************//**
Return 0 on success and non-zero on failure. Note: the bool return type
seems to be abused here, should be an int. */
static
bool
innobase_show_status(
/*=================*/
	handlerton*		hton,	/*!< in: the innodb handlerton */
	THD*			thd,	/*!< in: the MySQL query thread of
					the caller */
	stat_print_fn*		stat_print,
	enum ha_stat_type	stat_type);

/*************************************************************//**
Checks if buffer pool is big enough to enable backoff algorithm.
InnoDB empty free list algorithm backoff requires free pages
from LRU for the best performance.
buf_LRU_buf_pool_running_out cancels query if 1/4 of 
buffer pool belongs to LRU or freelist.
At the same time buf_flush_LRU_list_batch
keeps up to BUF_LRU_MIN_LEN in LRU.
In order to avoid deadlock baclkoff requires buffer pool
to be at least 4*BUF_LRU_MIN_LEN,
but flush peformance is bad because of trashing
and additional BUF_LRU_MIN_LEN pages are requested.
@return	true if it's possible to enable backoff. */
static
bool
innodb_empty_free_list_algorithm_backoff_allowed(
	srv_empty_free_list_t
			algorithm,		/*!< in: desired algorithm
						from srv_empty_free_list_t */
	long long	buf_pool_pages);	/*!< in: total number
						of pages inside buffer pool */

/****************************************************************//**
Parse and enable InnoDB monitor counters during server startup.
User can enable monitor counters/groups by specifying
"loose-innodb_monitor_enable = monitor_name1;monitor_name2..."
in server configuration file or at the command line. */
static
void
innodb_enable_monitor_at_startup(
/*=============================*/
	char*	str);	/*!< in: monitor counter enable list */

/** Fill handlerton based INFORMATION_SCHEMA tables.
@param[in]		(unused) Handle to the handlerton structure
@param[in]	thd	Thread/connection descriptor
@param[in,out]	tables	Information Schema tables to fill
@param[in]		(unused) Intended for conditional pushdown
@param[in]	idx	Table id that indicates which I_S table to fill
@return Operation status */
static
int
innobase_fill_i_s_table(
	handlerton*,
	THD*			thd,
	TABLE_LIST*		tables,
	Item*,
	enum_schema_tables	idx)
{
	int	ret = 0;

	if (idx == SCH_FILES) {
		ret = i_s_files_table_fill(thd, tables);
	}

	return(ret);
}

/** Store doc_id value into FTS_DOC_ID field
@param[in,out]	tbl	table containing FULLTEXT index
@param[in]	doc_id	FTS_DOC_ID value */
static
void
innobase_fts_store_docid(
	TABLE*		tbl,
	ulonglong	doc_id)
{
	my_bitmap_map*	old_map
		= dbug_tmp_use_all_columns(tbl, tbl->write_set);

	tbl->fts_doc_id_field->store(static_cast<longlong>(doc_id), true);

	dbug_tmp_restore_column_map(tbl->write_set, old_map);
}

/*************************************************************//**
Check for a valid value of innobase_commit_concurrency.
@return 0 for valid innodb_commit_concurrency */
static
int
innobase_commit_concurrency_validate(
/*=================================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming string */
{
	long long	intbuf;
	ulong		commit_concurrency;

	DBUG_ENTER("innobase_commit_concurrency_validate");

	if (value->val_int(value, &intbuf)) {
		/* The value is NULL. That is invalid. */
		DBUG_RETURN(1);
	}

	*reinterpret_cast<ulong*>(save) = commit_concurrency
		= static_cast<ulong>(intbuf);

	/* Allow the value to be updated, as long as it remains zero
	or nonzero. */
	DBUG_RETURN(!(!commit_concurrency == !innobase_commit_concurrency));
}

/*******************************************************************//**
Function for constructing an InnoDB table handler instance. */
static
handler*
innobase_create_handler(
/*====================*/
	handlerton*	hton,	/*!< in: InnoDB handlerton */
	TABLE_SHARE*	table,
	MEM_ROOT*	mem_root)
{
	/* If the table:
	1) have type InnoDB (not the generic partition handlerton)
	2) have partitioning defined
	Then return the native partitioning handler ha_innopart
	else return normal ha_innobase handler. */
	if (table
	    && table->db_type() == innodb_hton_ptr // 1)
	    && table->partition_info_str           // 2)
	    && table->partition_info_str_len) {    // 2)
		ha_innopart* file = new (mem_root) ha_innopart(hton, table);
		if (file && file->init_partitioning(mem_root))
		{
			delete file;
			return(NULL);
		}
		return(file);
	}

	return(new (mem_root) ha_innobase(hton, table));
}

/* General functions */

/** Check that a page_size is correct for InnoDB.
If correct, set the associated page_size_shift which is the power of 2
for this page size.
@param[in]	page_size	Page Size to evaluate
@return an associated page_size_shift if valid, 0 if invalid. */
inline
ulong
innodb_page_size_validate(
	ulong	page_size)
{
	ulong		n;

	DBUG_ENTER("innodb_page_size_validate");

	for (n = UNIV_PAGE_SIZE_SHIFT_MIN;
	     n <= UNIV_PAGE_SIZE_SHIFT_MAX;
	     n++) {
		if (page_size == static_cast<ulong>(1 << n)) {
			DBUG_RETURN(n);
		}
	}

	DBUG_RETURN(0);
}

/******************************************************************//**
Returns true if the thread is the replication thread on the slave
server. Used in srv_conc_enter_innodb() to determine if the thread
should be allowed to enter InnoDB - the replication thread is treated
differently than other threads. Also used in
srv_conc_force_exit_innodb().
@return true if thd is the replication thread */
ibool
thd_is_replication_slave_thread(
/*============================*/
	THD*	thd)	/*!< in: thread handle */
{
	return((ibool) thd_slave_thread(thd));
}

/******************************************************************//**
Gets information on the durability property requested by thread.
Used when writing either a prepare or commit record to the log
buffer. @return the durability property. */
enum durability_properties
thd_requested_durability(
/*=====================*/
	const THD* thd)	/*!< in: thread handle */
{
	return(thd_get_durability_property(thd));
}

/******************************************************************//**
Returns true if transaction should be flagged as read-only.
@return true if the thd is marked as read-only */
bool
thd_trx_is_read_only(
/*=================*/
	THD*	thd)	/*!< in: thread handle */
{
	return(thd != 0 && thd_tx_is_read_only(thd));
}

/**
Check if the transaction can be rolled back
@param[in] requestor	Session requesting the lock
@param[in] holder	Session that holds the lock
@return the session that will be rolled back, null don't care */

THD*
thd_trx_arbitrate(THD* requestor, THD* holder)
{
	/* Non-user (thd==0) transactions by default can't rollback, in
	practice DDL transactions should never rollback and that's because
	they should never wait on table/record locks either */

	ut_a(holder != NULL);
	ut_a(holder != requestor);

	THD*	victim = thd_tx_arbitrate(requestor, holder);

	ut_a(victim == NULL || victim == requestor || victim == holder);

	return(victim);
}

/**
@param[in] thd		Session to check
@return the priority */

int
thd_trx_priority(THD* thd)
{
	return(thd == NULL ? 0 : thd_tx_priority(thd));
}

#ifdef UNIV_DEBUG
/**
Returns true if transaction should be flagged as DD attachable transaction
@param[in] thd			Thread handle
@return true if the thd is marked as read-only */
bool
thd_trx_is_dd_trx(THD* thd)
{
	return(thd != NULL && thd_tx_is_dd_trx(thd));
}
#endif /* UNIV_DEBUG */

/******************************************************************//**
Check if the transaction is an auto-commit transaction. TRUE also
implies that it is a SELECT (read-only) transaction.
@return true if the transaction is an auto commit read-only transaction. */
ibool
thd_trx_is_auto_commit(
/*===================*/
	THD*	thd)	/*!< in: thread handle, can be NULL */
{
	return(thd != NULL
	       && !thd_test_options(
		       thd,
		       OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)
	       && thd_is_select(thd));
}

extern "C" long long thd_start_time(const THD* thd);

/******************************************************************//**
Get the thread start time.
@return the thread start time in seconds since the epoch. */
ulint
thd_start_time_in_secs(
/*===================*/
	THD*	thd)	/*!< in: thread handle, or NULL */
{
	// FIXME: This function should be added to the server code.
	//return(thd_start_time(thd));
	return(ulint(ut_time()));
}

/** Enter InnoDB engine after checking the max number of user threads
allowed, else the thread is put into sleep.
@param[in,out]	prebuilt	row prebuilt handler */
static inline
void
innobase_srv_conc_enter_innodb(
	row_prebuilt_t*	prebuilt)
{
	/* We rely on server to do external_lock(F_UNLCK) to reset the
	srv_conc.n_active counter. Since there are no locks on instrinsic
	tables, we should skip this for intrinsic temporary tables. */
	if (dict_table_is_intrinsic(prebuilt->table)) {
		return;
	}

	trx_t*	trx	= prebuilt->trx;
	if (srv_thread_concurrency) {
		if (trx->n_tickets_to_enter_innodb > 0) {

			/* If trx has 'free tickets' to enter the engine left,
			then use one such ticket */

			--trx->n_tickets_to_enter_innodb;

		} else if (trx->mysql_thd != NULL
			   && thd_is_replication_slave_thread(trx->mysql_thd)) {

			UT_WAIT_FOR(
				srv_conc_get_active_threads()
				< srv_thread_concurrency,
				srv_replication_delay * 1000);

		} else {
			srv_conc_enter_innodb(prebuilt);
		}
	}
}

/** Note that the thread wants to leave InnoDB only if it doesn't have
any spare tickets.
@param[in,out]	m_prebuilt	row prebuilt handler */
static inline
void
innobase_srv_conc_exit_innodb(
	row_prebuilt_t*	prebuilt)
{
	/* We rely on server to do external_lock(F_UNLCK) to reset the
	srv_conc.n_active counter. Since there are no locks on instrinsic
	tables, we should skip this for intrinsic temporary tables. */
	if (dict_table_is_intrinsic(prebuilt->table)) {
		return;
	}

	trx_t*			trx = prebuilt->trx;
#ifdef UNIV_DEBUG
	btrsea_sync_check	check(trx->has_search_latch);

	ut_ad(!sync_check_iterate(check));
#endif /* UNIV_DEBUG */

	/* This is to avoid making an unnecessary function call. */
	if (trx->declared_to_be_inside_innodb
	    && trx->n_tickets_to_enter_innodb == 0) {

		srv_conc_force_exit_innodb(trx);
	}
}

/******************************************************************//**
Force a thread to leave InnoDB even if it has spare tickets. */
static inline
void
innobase_srv_conc_force_exit_innodb(
/*================================*/
	trx_t*	trx)	/*!< in: transaction handle */
{
#ifdef UNIV_DEBUG
	btrsea_sync_check	check(trx->has_search_latch);

	ut_ad(!sync_check_iterate(check));
#endif /* UNIV_DEBUG */

	/* This is to avoid making an unnecessary function call. */
	if (trx->declared_to_be_inside_innodb) {
		srv_conc_force_exit_innodb(trx);
	}
}

/******************************************************************//**
Returns the NUL terminated value of glob_hostname.
@return pointer to glob_hostname. */
const char*
server_get_hostname()
/*=================*/
{
	return(glob_hostname);
}

/******************************************************************//**
Returns true if the transaction this thread is processing has edited
non-transactional tables. Used by the deadlock detector when deciding
which transaction to rollback in case of a deadlock - we try to avoid
rolling back transactions that have edited non-transactional tables.
@return true if non-transactional tables have been edited */
ibool
thd_has_edited_nontrans_tables(
/*===========================*/
	THD*	thd)	/*!< in: thread handle */
{
	return((ibool) thd_non_transactional_update(thd));
}

/******************************************************************//**
Returns true if the thread is executing a SELECT statement.
@return true if thd is executing SELECT */
ibool
thd_is_select(
/*==========*/
	const THD*	thd)	/*!< in: thread handle */
{
	return(thd_sql_command(thd) == SQLCOM_SELECT);
}

/******************************************************************//**
Returns the lock wait timeout for the current connection.
@return the lock wait timeout, in seconds */
ulong
thd_lock_wait_timeout(
/*==================*/
	THD*	thd)	/*!< in: thread handle, or NULL to query
			the global innodb_lock_wait_timeout */
{
	/* According to <mysql/plugin.h>, passing thd == NULL
	returns the global value of the session variable. */
	return(THDVAR(thd, lock_wait_timeout));
}

/******************************************************************//**
Set the time waited for the lock for the current query. */
void
thd_set_lock_wait_time(
/*===================*/
	THD*	thd,	/*!< in/out: thread handle */
	ulint	value)	/*!< in: time waited for the lock */
{
	if (thd) {
		thd_storage_lock_wait(thd, value);
	}
}

/** Get the value of innodb_tmpdir.
@param[in]	thd	thread handle, or NULL to query
			the global innodb_tmpdir.
@retval NULL if innodb_tmpdir="" */
const char*
thd_innodb_tmpdir(
	THD*	thd)
{

#ifdef UNIV_DEBUG
	trx_t*	trx = thd_to_trx(thd);
	btrsea_sync_check	check(trx->has_search_latch);
	ut_ad(!sync_check_iterate(check));
#endif /* UNIV_DEBUG */

	const char*	tmp_dir = THDVAR(thd, tmpdir);

	if (tmp_dir != NULL && *tmp_dir == '\0') {
		tmp_dir = NULL;
	}

	return(tmp_dir);
}

/** Obtain the private handler of InnoDB session specific data.
@param[in,out]	thd	MySQL thread handler.
@return reference to private handler */
__attribute__((warn_unused_result))
static
innodb_session_t*&
thd_to_innodb_session(
	THD*	thd)
{
	DBUG_ASSERT(innodb_hton_ptr->slot != HA_SLOT_UNDEF);
	innodb_session_t*& innodb_session =
		*(innodb_session_t**) thd_ha_data(thd, innodb_hton_ptr);

	if (innodb_session != NULL) {
		return(innodb_session);
	}

	innodb_session = UT_NEW_NOKEY(innodb_session_t());
	return(innodb_session);
}

/******************************************************************//**
*/

ulong
thd_flush_log_at_trx_commit(
/*================================*/
	void*	thd)
{
	return(THDVAR((THD*) thd, flush_log_at_trx_commit));
}

/** Obtain the InnoDB transaction of a MySQL thread.
@param[in,out]	thd	MySQL thread handler.
@return reference to transaction pointer */
__attribute__((warn_unused_result))
trx_t*&
thd_to_trx(
	THD*	thd)
{
	innodb_session_t*& innodb_session = thd_to_innodb_session(thd);
	ut_ad(innodb_session != NULL);

	return(innodb_session->m_trx);
}

/** Check if statement is of type INSERT .... SELECT that involves
use of intrinsic tables.
@param[in]	thd	thread handler
@return true if INSERT .... SELECT statement. */
static inline
bool
thd_is_ins_sel_stmt(THD* user_thd)
{
	/* If the session involves use of intrinsic table
	and it is trying to fetch the result from non-temporary tables
	it indicates "insert .... select" statement. For non-temporary
	table this is verifed using the locked tables count but for
	intrinsic table as external_lock is not invoked this count is
	not updated.

	Why is this needed ?
	Use of AHI is blocked if statement is insert .... select statement. */
	innodb_session_t*	innodb_priv = thd_to_innodb_session(user_thd);
	return(innodb_priv->count_register_table_handler() > 0 ? true : false);
}

/** Add the table handler to thread cache.
Obtain the InnoDB transaction of a MySQL thread.
@param[in,out]	table		table handler
@param[in,out]	heap		heap for allocating system columns.
@param[in,out]	thd		MySQL thread handler */
static inline
void
add_table_to_thread_cache(
	dict_table_t*	table,
	mem_heap_t*	heap,
	THD*		thd)
{
	dict_table_add_system_columns(table, heap);

	dict_table_set_big_rows(table);

	innodb_session_t*& priv = thd_to_innodb_session(thd);
	priv->register_table_handler(table->name.m_name, table);
}

/********************************************************************//**
In XtraDB it is impossible for a transaction to own a search latch outside of
InnoDB code, so there is nothing to release on demand.  We keep this function to
simplify maintenance.
@return 0 */
inline
int
innobase_release_temporary_latches(
/*===============================*/
	handlerton*	hton __attribute__((unused)),	/*!< in: handlerton */
	THD*		thd __attribute__((unused)))	/*!< in: MySQL thread */
{
#ifdef UNIV_DEBUG
	DBUG_ASSERT(hton == innodb_hton_ptr);

	if (!innodb_inited || thd == NULL) {

		return(0);
	}

	trx_t*	trx = thd_to_trx(thd);

	if (trx != NULL) {
		trx_search_latch_release_if_reserved(trx);
	}
#endif

	return(0);
}

/********************************************************************//**
Increments innobase_active_counter and every INNOBASE_WAKE_INTERVALth
time calls srv_active_wake_master_thread. This function should be used
when a single database operation may introduce a small need for
server utility activity, like checkpointing. */
inline
void
innobase_active_small(void)
/*=======================*/
{
	innobase_active_counter++;

	if ((innobase_active_counter % INNOBASE_WAKE_INTERVAL) == 0) {
		srv_active_wake_master_thread();
	}
}

/********************************************************************//**
Converts an InnoDB error code to a MySQL error code and also tells to MySQL
about a possible transaction rollback inside InnoDB caused by a lock wait
timeout or a deadlock.
@return MySQL error code */
int
convert_error_code_to_mysql(
/*========================*/
	dberr_t	error,	/*!< in: InnoDB error code */
	ulint	flags,  /*!< in: InnoDB table flags, or 0 */
	THD*	thd)	/*!< in: user thread handle or NULL */
{
	switch (error) {
	case DB_SUCCESS:
		return(0);

	case DB_INTERRUPTED:
		thd_set_kill_status(thd != NULL ? thd : current_thd);
		return(HA_ERR_GENERIC);

	case DB_FOREIGN_EXCEED_MAX_CASCADE:
		ut_ad(thd);
		my_error(ER_FK_DEPTH_EXCEEDED, MYF(0), FK_MAX_CASCADE_DEL);
		return(HA_ERR_FK_DEPTH_EXCEEDED);

	case DB_CANT_CREATE_GEOMETRY_OBJECT:
		my_error(ER_CANT_CREATE_GEOMETRY_OBJECT, MYF(0));
		return(HA_ERR_NULL_IN_SPATIAL);

	case DB_ERROR:
	default:
		return(HA_ERR_GENERIC); /* unspecified error */

	case DB_DUPLICATE_KEY:
		/* Be cautious with returning this error, since
		mysql could re-enter the storage layer to get
		duplicated key info, the operation requires a
		valid table handle and/or transaction information,
		which might not always be available in the error
		handling stage. */
		return(HA_ERR_FOUND_DUPP_KEY);

	case DB_READ_ONLY:
		if(srv_force_recovery) {
			return(HA_ERR_INNODB_FORCED_RECOVERY);
		}
		return(HA_ERR_TABLE_READONLY);

	case DB_FOREIGN_DUPLICATE_KEY:
		return(HA_ERR_FOREIGN_DUPLICATE_KEY);

	case DB_MISSING_HISTORY:
		return(HA_ERR_TABLE_DEF_CHANGED);

	case DB_RECORD_NOT_FOUND:
		return(HA_ERR_NO_ACTIVE_RECORD);

	case DB_FORCED_ABORT:
	case DB_DEADLOCK:
		/* Since we rolled back the whole transaction, we must
		tell it also to MySQL so that MySQL knows to empty the
		cached binlog for this transaction */

		if (thd != NULL) {
			thd_mark_transaction_to_rollback(thd, 1);
		}

		return(HA_ERR_LOCK_DEADLOCK);

	case DB_LOCK_WAIT_TIMEOUT:
		/* Starting from 5.0.13, we let MySQL just roll back the
		latest SQL statement in a lock wait timeout. Previously, we
		rolled back the whole transaction. */

		if (thd) {
			thd_mark_transaction_to_rollback(
				thd, (int) row_rollback_on_timeout);
		}

		return(HA_ERR_LOCK_WAIT_TIMEOUT);

	case DB_NO_REFERENCED_ROW:
		return(HA_ERR_NO_REFERENCED_ROW);

	case DB_ROW_IS_REFERENCED:
		return(HA_ERR_ROW_IS_REFERENCED);

	case DB_NO_FK_ON_V_BASE_COL:
	case DB_CANNOT_ADD_CONSTRAINT:
	case DB_CHILD_NO_INDEX:
	case DB_PARENT_NO_INDEX:
		return(HA_ERR_CANNOT_ADD_FOREIGN);

	case DB_CANNOT_DROP_CONSTRAINT:

		return(HA_ERR_ROW_IS_REFERENCED); /* TODO: This is a bit
						misleading, a new MySQL error
						code should be introduced */

	case DB_CORRUPTION:
		return(HA_ERR_CRASHED);

	case DB_OUT_OF_FILE_SPACE:
		return(HA_ERR_RECORD_FILE_FULL);

	case DB_TEMP_FILE_WRITE_FAIL:
		return(HA_ERR_TEMP_FILE_WRITE_FAILURE);

	case DB_TABLE_IN_FK_CHECK:
		return(HA_ERR_TABLE_IN_FK_CHECK);

	case DB_TABLE_IS_BEING_USED:
		return(HA_ERR_WRONG_COMMAND);

	case DB_TABLE_NOT_FOUND:
		return(HA_ERR_NO_SUCH_TABLE);

	case DB_TABLESPACE_NOT_FOUND:
		return(HA_ERR_TABLESPACE_MISSING);

	case DB_TOO_BIG_RECORD: {
		/* If prefix is true then a 768-byte prefix is stored
		locally for BLOB fields. Refer to dict_table_get_format().
		We limit max record size to 16k for 64k page size. */
		bool prefix = (dict_tf_get_format(flags) == UNIV_FORMAT_A);
		my_printf_error(ER_TOO_BIG_ROWSIZE,
			"Row size too large (> %lu). Changing some columns"
			" to TEXT or BLOB %smay help. In current row"
			" format, BLOB prefix of %d bytes is stored inline.",
			MYF(0),
			srv_page_size == UNIV_PAGE_SIZE_MAX
			? REC_MAX_DATA_SIZE - 1
			: page_get_free_space_of_empty(flags &
				DICT_TF_COMPACT) / 2,
			prefix
			? "or using ROW_FORMAT=DYNAMIC or"
			  " ROW_FORMAT=COMPRESSED "
			: "",
			prefix
			? DICT_MAX_FIXED_COL_LEN
			: 0);
		return(HA_ERR_TOO_BIG_ROW);
	}

	case DB_TOO_BIG_INDEX_COL:
		my_error(ER_INDEX_COLUMN_TOO_LONG, MYF(0),
			 DICT_MAX_FIELD_LEN_BY_FORMAT_FLAG(flags));
		return(HA_ERR_INDEX_COL_TOO_LONG);

	case DB_NO_SAVEPOINT:
		return(HA_ERR_NO_SAVEPOINT);

	case DB_LOCK_TABLE_FULL:
		/* Since we rolled back the whole transaction, we must
		tell it also to MySQL so that MySQL knows to empty the
		cached binlog for this transaction */

		if (thd) {
			thd_mark_transaction_to_rollback(thd, 1);
		}

		return(HA_ERR_LOCK_TABLE_FULL);

	case DB_FTS_INVALID_DOCID:
		return(HA_FTS_INVALID_DOCID);
	case DB_FTS_EXCEED_RESULT_CACHE_LIMIT:
		return(HA_ERR_FTS_EXCEED_RESULT_CACHE_LIMIT);
	case DB_TOO_MANY_CONCURRENT_TRXS:
		return(HA_ERR_TOO_MANY_CONCURRENT_TRXS);
	case DB_UNSUPPORTED:
		return(HA_ERR_UNSUPPORTED);
	case DB_INDEX_CORRUPT:
		return(HA_ERR_INDEX_CORRUPT);
	case DB_UNDO_RECORD_TOO_BIG:
		return(HA_ERR_UNDO_REC_TOO_BIG);
	case DB_OUT_OF_MEMORY:
		return(HA_ERR_OUT_OF_MEM);
	case DB_TABLESPACE_EXISTS:
		return(HA_ERR_TABLESPACE_EXISTS);
	case DB_TABLESPACE_DELETED:
		return(HA_ERR_TABLESPACE_MISSING);
	case DB_IDENTIFIER_TOO_LONG:
		return(HA_ERR_INTERNAL_ERROR);
	case DB_TABLE_CORRUPT:
		return(HA_ERR_TABLE_CORRUPT);
	case DB_FTS_TOO_MANY_WORDS_IN_PHRASE:
		return(HA_ERR_FTS_TOO_MANY_WORDS_IN_PHRASE);
	case DB_WRONG_FILE_NAME:
		return(HA_ERR_WRONG_FILE_NAME);
	case DB_COMPUTE_VALUE_FAILED:
		return(HA_ERR_COMPUTE_FAILED);
	}
}

/*************************************************************//**
Prints info of a THD object (== user session thread) to the given file. */
void
innobase_mysql_print_thd(
/*=====================*/
	FILE*	f,		/*!< in: output stream */
	THD*	thd,		/*!< in: MySQL THD object */
	uint	max_query_len)	/*!< in: max query length to print, or 0 to
				use the default max length */
{
	char	buffer[1024];

	fputs(thd_security_context(thd, buffer, sizeof buffer,
				   max_query_len), f);
	putc('\n', f);
}

/******************************************************************//**
Get the error message format string.
@return the format string or 0 if not found. */
const char*
innobase_get_err_msg(
/*=================*/
	int	error_code)	/*!< in: MySQL error code */
{
	return(my_get_err_msg(error_code));
}

/******************************************************************//**
Get the variable length bounds of the given character set. */
void
innobase_get_cset_width(
/*====================*/
	ulint	cset,		/*!< in: MySQL charset-collation code */
	ulint*	mbminlen,	/*!< out: minimum length of a char (in bytes) */
	ulint*	mbmaxlen)	/*!< out: maximum length of a char (in bytes) */
{
	CHARSET_INFO*	cs;
	ut_ad(cset <= MAX_CHAR_COLL_NUM);
	ut_ad(mbminlen);
	ut_ad(mbmaxlen);

	cs = all_charsets[cset];
	if (cs) {
		*mbminlen = cs->mbminlen;
		*mbmaxlen = cs->mbmaxlen;
		ut_ad(*mbminlen < DATA_MBMAX);
		ut_ad(*mbmaxlen < DATA_MBMAX);
	} else {
		THD*	thd = current_thd;

		if (thd && thd_sql_command(thd) == SQLCOM_DROP_TABLE) {

			/* Fix bug#46256: allow tables to be dropped if the
			collation is not found, but issue a warning. */
			if (cset != 0) {

				sql_print_warning(
					"Unknown collation #%lu.", cset);
			}
		} else {

			ut_a(cset == 0);
		}

		*mbminlen = *mbmaxlen = 0;
	}
}

/******************************************************************//**
Converts an identifier to a table name. */
void
innobase_convert_from_table_id(
/*===========================*/
	CHARSET_INFO*	cs,	/*!< in: the 'from' character set */
	char*		to,	/*!< out: converted identifier */
	const char*	from,	/*!< in: identifier to convert */
	ulint		len)	/*!< in: length of 'to', in bytes */
{
	uint	errors;

	strconvert(cs, from, &my_charset_filename, to, len, &errors);
}

/**********************************************************************
Check if the length of the identifier exceeds the maximum allowed.
return true when length of identifier is too long. */
my_bool
innobase_check_identifier_length(
/*=============================*/
	const char*	id)	/* in: FK identifier to check excluding the
				database portion. */
{
	int		well_formed_error = 0;
	CHARSET_INFO	*cs = system_charset_info;
	DBUG_ENTER("innobase_check_identifier_length");

	size_t len = cs->cset->well_formed_len(
		cs, id, id + strlen(id),
		NAME_CHAR_LEN, &well_formed_error);

	if (well_formed_error || len == NAME_CHAR_LEN) {
		my_error(ER_TOO_LONG_IDENT, MYF(0), id);
		DBUG_RETURN(true);
	}
	DBUG_RETURN(false);
}

/******************************************************************//**
Converts an identifier to UTF-8. */
void
innobase_convert_from_id(
/*=====================*/
	CHARSET_INFO*	cs,	/*!< in: the 'from' character set */
	char*		to,	/*!< out: converted identifier */
	const char*	from,	/*!< in: identifier to convert */
	ulint		len)	/*!< in: length of 'to', in bytes */
{
	uint	errors;

	strconvert(cs, from, system_charset_info, to, len, &errors);
}

/******************************************************************//**
Compares NUL-terminated UTF-8 strings case insensitively.
@return 0 if a=b, <0 if a<b, >1 if a>b */
int
innobase_strcasecmp(
/*================*/
	const char*	a,	/*!< in: first string to compare */
	const char*	b)	/*!< in: second string to compare */
{
	if (!a) {
		if (!b) {
			return(0);
		} else {
			return(-1);
		}
	} else if (!b) {
		return(1);
	}

	return(my_strcasecmp(system_charset_info, a, b));
}

/******************************************************************//**
Compares NUL-terminated UTF-8 strings case insensitively. The
second string contains wildcards.
@return 0 if a match is found, 1 if not */
int
innobase_wildcasecmp(
/*=================*/
	const char*	a,	/*!< in: string to compare */
	const char*	b)	/*!< in: wildcard string to compare */
{
	return(wild_case_compare(system_charset_info, a, b));
}

/** Strip dir name from a full path name and return only the file name
@param[in]	path_name	full path name
@return file name or "null" if no file name */
const char*
innobase_basename(
	const char*	path_name)
{
	const char*	name = base_name(path_name);

	return((name) ? name : "null");
}

/******************************************************************//**
Makes all characters in a NUL-terminated UTF-8 string lower case. */
void
innobase_casedn_str(
/*================*/
	char*	a)	/*!< in/out: string to put in lower case */
{
	my_casedn_str(system_charset_info, a);
}

/**********************************************************************//**
Determines the connection character set.
@return connection character set */
CHARSET_INFO*
innobase_get_charset(
/*=================*/
	THD*	mysql_thd)	/*!< in: MySQL thread handle */
{
	return(thd_charset(mysql_thd));
}

/** Determines the current SQL statement.
Thread unsafe, can only be called from the thread owning the THD.
@param[in]	thd	MySQL thread handle
@param[out]	length	Length of the SQL statement
@return			SQL statement string */
const char*
innobase_get_stmt_unsafe(
/*==============*/
	THD*	thd,
	size_t*	length)
{
	LEX_CSTRING stmt;

	stmt = thd_query_unsafe(thd);
	*length = stmt.length;
	return(stmt.str);
}

/** Determines the current SQL statement.
Thread safe, can be called from any thread as the string is copied
into the provided buffer.
@param[in]	thd	MySQL thread handle
@param[out]	buf	Buffer containing SQL statement
@param[in]	buflen	Length of provided buffer
@return			Length of the SQL statement */
size_t
innobase_get_stmt_safe(
/*==============*/
	THD*	thd,
	char*	buf,
	size_t	buflen)
{
	return(thd_query_safe(thd, buf, buflen));
}

/**********************************************************************//**
Get the current setting of the table_def_size global parameter. We do
a dirty read because for one there is no synchronization object and
secondly there is little harm in doing so even if we get a torn read.
@return value of table_def_size */
ulint
innobase_get_table_cache_size(void)
/*===============================*/
{
	return(table_def_size);
}

/**********************************************************************//**
Get the current setting of the lower_case_table_names global parameter from
mysqld.cc. We do a dirty read because for one there is no synchronization
object and secondly there is little harm in doing so even if we get a torn
read.
@return value of lower_case_table_names */
ulint
innobase_get_lower_case_table_names(void)
/*=====================================*/
{
	return(lower_case_table_names);
}


/** Creates a temporary file in the location specified by the parameter
path. If the path is NULL, then it will be created in tmpdir.
@param[in]	path	location for creating temporary file
@return temporary file descriptor, or < 0 on error */
int
innobase_mysql_tmpfile(
	const char*	path)
{
	int	fd2 = -1;
	File	fd;

	DBUG_EXECUTE_IF(
		"innobase_tmpfile_creation_failure",
		return(-1);
	);

	if (path == NULL) {
		fd = mysql_tmpfile("ib");
	} else {
		fd = mysql_tmpfile_path(path, "ib");
	}

	if (fd >= 0) {
		/* Copy the file descriptor, so that the additional resources
		allocated by create_temp_file() can be freed by invoking
		my_close().

		Because the file descriptor returned by this function
		will be passed to fdopen(), it will be closed by invoking
		fclose(), which in turn will invoke close() instead of
		my_close(). */

#ifdef _WIN32
		/* Note that on Windows, the integer returned by mysql_tmpfile
		has no relation to C runtime file descriptor. Here, we need
		to call my_get_osfhandle to get the HANDLE and then convert it
		to C runtime filedescriptor. */
		{
			HANDLE hFile = my_get_osfhandle(fd);
			HANDLE hDup;
			BOOL bOK = DuplicateHandle(
					GetCurrentProcess(),
					hFile, GetCurrentProcess(),
					&hDup, 0, FALSE, DUPLICATE_SAME_ACCESS);
			if (bOK) {
				fd2 = _open_osfhandle((intptr_t) hDup, 0);
			} else {
				my_osmaperr(GetLastError());
				fd2 = -1;
			}
		}
#else
		fd2 = dup(fd);
#endif
		if (fd2 < 0) {
			char errbuf[MYSYS_STRERROR_SIZE];
			DBUG_PRINT("error",("Got error %d on dup",fd2));
			set_my_errno(errno);
			my_error(EE_OUT_OF_FILERESOURCES,
				 MYF(0),
				 "ib*", my_errno(),
				 my_strerror(errbuf, sizeof(errbuf), my_errno()));
		}
		my_close(fd, MYF(MY_WME));
	}
	return(fd2);
}

/*********************************************************************//**
Wrapper around MySQL's copy_and_convert function.
@return number of bytes copied to 'to' */
ulint
innobase_convert_string(
/*====================*/
	void*		to,		/*!< out: converted string */
	ulint		to_length,	/*!< in: number of bytes reserved
					for the converted string */
	CHARSET_INFO*	to_cs,		/*!< in: character set to convert to */
	const void*	from,		/*!< in: string to convert */
	ulint		from_length,	/*!< in: number of bytes to convert */
	CHARSET_INFO*	from_cs,	/*!< in: character set to convert
					from */
	uint*		errors)		/*!< out: number of errors encountered
					during the conversion */
{
	return(copy_and_convert(
			(char*) to, (uint32) to_length, to_cs,
			(const char*) from, (uint32) from_length, from_cs,
			errors));
}

/*******************************************************************//**
Formats the raw data in "data" (in InnoDB on-disk format) that is of
type DATA_(CHAR|VARCHAR|MYSQL|VARMYSQL) using "charset_coll" and writes
the result to "buf". The result is converted to "system_charset_info".
Not more than "buf_size" bytes are written to "buf".
The result is always NUL-terminated (provided buf_size > 0) and the
number of bytes that were written to "buf" is returned (including the
terminating NUL).
@return number of bytes that were written */
ulint
innobase_raw_format(
/*================*/
	const char*	data,		/*!< in: raw data */
	ulint		data_len,	/*!< in: raw data length
					in bytes */
	ulint		charset_coll,	/*!< in: charset collation */
	char*		buf,		/*!< out: output buffer */
	ulint		buf_size)	/*!< in: output buffer size
					in bytes */
{
	/* XXX we use a hard limit instead of allocating
	but_size bytes from the heap */
	CHARSET_INFO*	data_cs;
	char		buf_tmp[8192];
	ulint		buf_tmp_used;
	uint		num_errors;

	data_cs = all_charsets[charset_coll];

	buf_tmp_used = innobase_convert_string(buf_tmp, sizeof(buf_tmp),
					       system_charset_info,
					       data, data_len, data_cs,
					       &num_errors);

	return(ut_str_sql_format(buf_tmp, buf_tmp_used, buf, buf_size));
}

/** Check if the string is "empty" or "none".
@param[in]      algorithm       Compression algorithm to check
@return true if no algorithm requested */
bool
Compression::is_none(const char* algorithm)
{
	/* NULL is the same as NONE */
	if (algorithm == NULL || innobase_strcasecmp(algorithm, "none") == 0) {
		return(true);
	}

	return(false);
}

/** Check for supported COMPRESS := (ZLIB | LZ4 | NONE) supported values
@param[in]	name		Name of the compression algorithm
@param[out]	compression	The compression algorithm
@return DB_SUCCESS or DB_UNSUPPORTED */
dberr_t
Compression::check(
	const char*	algorithm,
	Compression*	compression)
{
	if (is_none(algorithm)) {

		compression->m_type = NONE;

	} else if (innobase_strcasecmp(algorithm, "zlib") == 0) {

		compression->m_type = ZLIB;

	} else if (innobase_strcasecmp(algorithm, "lz4") == 0) {

		compression->m_type = LZ4;

	} else {
		return(DB_UNSUPPORTED);
	}

	return(DB_SUCCESS);
}

/** Check for supported COMPRESS := (ZLIB | LZ4 | NONE) supported values
@param[in]	name		Name of the compression algorithm
@param[out]	compression	The compression algorithm
@return DB_SUCCESS or DB_UNSUPPORTED */
dberr_t
Compression::validate(const char* algorithm)
{
	Compression	compression;

	return(check(algorithm, &compression));
}

/** Check if the string is "" or "n".
@param[in]      algorithm       Encryption algorithm to check
@return true if no algorithm requested */
bool
Encryption::is_none(const char* algorithm)
{
	/* NULL is the same as NONE */
	if (algorithm == NULL
	    || innobase_strcasecmp(algorithm, "n") == 0
	    || innobase_strcasecmp(algorithm, "") == 0) {
		return(true);
	}

	return(false);
}

/** Check the encryption option and set it
@param[in]	option		encryption option
@param[in/out]	encryption	The encryption algorithm
@return DB_SUCCESS or DB_UNSUPPORTED */
dberr_t
Encryption::set_algorithm(
	const char*	option,
	Encryption*	encryption)
{
	if (is_none(option)) {

		encryption->m_type = NONE;

	} else if (innobase_strcasecmp(option, "y") == 0) {

		encryption->m_type = AES;

	} else {
		return(DB_UNSUPPORTED);
	}

	return(DB_SUCCESS);
}

/** Check for supported ENCRYPT := (Y | N) supported values
@param[in]	option		Encryption option
@param[out]	encryption	The encryption algorithm
@return DB_SUCCESS or DB_UNSUPPORTED */
dberr_t
Encryption::validate(const char* option)
{
	Encryption	encryption;

	return(encryption.set_algorithm(option, &encryption));
}
/*********************************************************************//**
Compute the next autoinc value.

For MySQL replication the autoincrement values can be partitioned among
the nodes. The offset is the start or origin of the autoincrement value
for a particular node. For n nodes the increment will be n and the offset
will be in the interval [1, n]. The formula tries to allocate the next
value for a particular node.

Note: This function is also called with increment set to the number of
values we want to reserve for multi-value inserts e.g.,

	INSERT INTO T VALUES(), (), ();

innobase_next_autoinc() will be called with increment set to 3 where
autoinc_lock_mode != TRADITIONAL because we want to reserve 3 values for
the multi-value INSERT above.
@return the next value */
ulonglong
innobase_next_autoinc(
/*==================*/
	ulonglong	current,	/*!< in: Current value */
	ulonglong	need,		/*!< in: count of values needed */
	ulonglong	step,		/*!< in: AUTOINC increment step */
	ulonglong	offset,		/*!< in: AUTOINC offset */
	ulonglong	max_value)	/*!< in: max value for type */
{
	ulonglong	next_value;
	ulonglong	block = need * step;

	/* Should never be 0. */
	ut_a(need > 0);
	ut_a(block > 0);
	ut_a(max_value > 0);

	/* According to MySQL documentation, if the offset is greater than
	the step then the offset is ignored. */
	if (offset > block) {
		offset = 0;
	}

	/* Check for overflow. Current can be > max_value if the value is
	in reality a negative value.The visual studio compilers converts
	large double values automatically into unsigned long long datatype
	maximum value */

	if (block >= max_value
	    || offset > max_value
	    || current >= max_value
	    || max_value - offset <= offset) {

		next_value = max_value;
	} else {
		ut_a(max_value > current);

		ulonglong	free = max_value - current;

		if (free < offset || free - offset <= block) {
			next_value = max_value;
		} else {
			next_value = 0;
		}
	}

	if (next_value == 0) {
		ulonglong	next;

		if (current > offset) {
			next = (current - offset) / step;
		} else {
			next = (offset - current) / step;
		}

		ut_a(max_value > next);
		next_value = next * step;
		/* Check for multiplication overflow. */
		ut_a(next_value >= next);
		ut_a(max_value > next_value);

		/* Check for overflow */
		if (max_value - next_value >= block) {

			next_value += block;

			if (max_value - next_value >= offset) {
				next_value += offset;
			} else {
				next_value = max_value;
			}
		} else {
			next_value = max_value;
		}
	}

	ut_a(next_value != 0);
	ut_a(next_value <= max_value);

	return(next_value);
}

/**
  Check whether given connection should log stats for slow query log InnoDB
  extensions.

  @param[in]	thd	connection handle
  @return whether stats for slow query log InnoDB extensions should be logged
*/
static
bool
innobase_slow_log_verbose(THD* thd)
{
	return thd && thd_opt_slow_log()
		&& unlikely(thd_log_slow_verbosity(thd)
			    & (1ULL << SLOG_V_INNODB))
		&& !thd_is_background_thread(thd);
}

/*********************************************************************//**
Initializes some fields in an InnoDB transaction object. */
static
void
innobase_trx_init(
/*==============*/
	THD*	thd,	/*!< in: user thread handle */
	trx_t*	trx)	/*!< in/out: InnoDB transaction handle */
{
	DBUG_ENTER("innobase_trx_init");
	DBUG_ASSERT(EQ_CURRENT_THD(thd));
	DBUG_ASSERT(thd == trx->mysql_thd);

	trx->check_foreigns = !thd_test_options(
		thd, OPTION_NO_FOREIGN_KEY_CHECKS);

	trx->check_unique_secondary = !thd_test_options(
		thd, OPTION_RELAXED_UNIQUE_CHECKS);

	trx->take_stats = innobase_slow_log_verbose(thd);

	DBUG_VOID_RETURN;
}

/*********************************************************************//**
Allocates an InnoDB transaction for a MySQL handler object for DML.
@return InnoDB transaction handle */
trx_t*
innobase_trx_allocate(
/*==================*/
	THD*	thd)	/*!< in: user thread handle */
{
	trx_t*	trx;

	DBUG_ENTER("innobase_trx_allocate");
	DBUG_ASSERT(thd != NULL);
	DBUG_ASSERT(EQ_CURRENT_THD(thd));

	trx = trx_allocate_for_mysql();

	trx->mysql_thd = thd;

	innobase_trx_init(thd, trx);

	DBUG_RETURN(trx);
}

/*********************************************************************//**
Gets the InnoDB transaction handle for a MySQL handler object, creates
an InnoDB transaction struct if the corresponding MySQL thread struct still
lacks one.
@return InnoDB transaction handle */
static inline
trx_t*
check_trx_exists(
/*=============*/
	THD*	thd)	/*!< in: user thread handle */
{
	trx_t*&	trx = thd_to_trx(thd);

	ut_ad(EQ_CURRENT_THD(thd));

	if (trx == NULL) {
		trx = innobase_trx_allocate(thd);

		/* User trx can be forced to rollback,
		so we unset the disable flag. */
		ut_ad(trx->in_innodb & TRX_FORCE_ROLLBACK_DISABLE);
		trx->in_innodb &= TRX_FORCE_ROLLBACK_MASK;
	} else {
		ut_a(trx->magic_n == TRX_MAGIC_N);

		innobase_trx_init(thd, trx);
	}

	return(trx);
}

/** Get the transaction of the current connection handle, if either exists.
@return transaction of the current connection handle, or NULL. */
trx_t*
innobase_get_trx(void)
{
	THD *thd = current_thd;
	if (UNIV_UNLIKELY(!thd))
		return(NULL);

	return(thd_to_trx(thd));
}

/** Get the transaction of the current connection handle if slow query log
InnoDB extended statistics should be collected.
@return transaction object if statistics should be collected, or NULL. */
trx_t*
innobase_get_trx_for_slow_log(void)
{
	THD* thd = current_thd;
	if (UNIV_LIKELY(!innobase_slow_log_verbose(thd)))
		return(NULL);
	trx_t* trx = thd_to_trx(thd);
	if (trx && trx->take_stats)
		return(trx);
	return(NULL);
}

/** InnoDB transaction object that is currently associated with THD is
replaced with that of the 2nd argument. The previous value is
returned through the 3rd argument's buffer, unless it's NULL.  When
the buffer is not provided (value NULL) that should mean the caller
restores previously saved association so the current trx has to be
additionally freed from all association with MYSQL.

@param[in,out]	thd		MySQL thread handle
@param[in]	new_trx_arg	replacement trx_t
@param[in,out]	ptr_trx_arg	pointer to a buffer to store old trx_t */
static
void
innodb_replace_trx_in_thd(
	THD*	thd,
	void*	new_trx_arg,
	void**	ptr_trx_arg)
{
	trx_t*& trx = thd_to_trx(thd);

	ut_ad(new_trx_arg == NULL
	      || (((trx_t*) new_trx_arg)->mysql_thd == thd
		  && !((trx_t*) new_trx_arg)->is_recovered));

	if (ptr_trx_arg) {
		*ptr_trx_arg = trx;

		ut_ad(trx == NULL
		      || (trx->mysql_thd == thd && !trx->is_recovered));

	} else if (trx->state == TRX_STATE_NOT_STARTED) {
		ut_ad(thd == trx->mysql_thd);
		trx_free_for_mysql(trx);
	} else {
		ut_ad(thd == trx->mysql_thd);
		ut_ad(trx_state_eq(trx, TRX_STATE_PREPARED));
		trx_disconnect_prepared(trx);
	}
	trx = static_cast<trx_t*>(new_trx_arg);
}

/*********************************************************************//**
Note that a transaction has been registered with MySQL.
@return true if transaction is registered with MySQL 2PC coordinator */
static inline
bool
trx_is_registered_for_2pc(
/*=========================*/
	const trx_t*	trx)	/* in: transaction */
{
	return(trx->is_registered == 1);
}

/*********************************************************************//**
Note that a transaction has been registered with MySQL 2PC coordinator. */
static inline
void
trx_register_for_2pc(
/*==================*/
	trx_t*	trx)	/* in: transaction */
{
	trx->is_registered = 1;
}

/*********************************************************************//**
Note that a transaction has been deregistered. */
static inline
void
trx_deregister_from_2pc(
/*====================*/
	trx_t*	trx)	/* in: transaction */
{
	trx->is_registered = 0;
}

/*********************************************************************//**
Copy table flags from MySQL's HA_CREATE_INFO into an InnoDB table object.
Those flags are stored in .frm file and end up in the MySQL table object,
but are frequently used inside InnoDB so we keep their copies into the
InnoDB table object. */
void
innobase_copy_frm_flags_from_create_info(
/*=====================================*/
	dict_table_t*		innodb_table,	/*!< in/out: InnoDB table */
	const HA_CREATE_INFO*	create_info)	/*!< in: create info */
{
	ibool	ps_on;
	ibool	ps_off;

	if (dict_table_is_temporary(innodb_table)) {
		/* Temp tables do not use persistent stats. */
		ps_on = FALSE;
		ps_off = TRUE;
	} else {
		ps_on = create_info->table_options
			& HA_OPTION_STATS_PERSISTENT;
		ps_off = create_info->table_options
			& HA_OPTION_NO_STATS_PERSISTENT;
	}

	dict_stats_set_persistent(innodb_table, ps_on, ps_off);

	dict_stats_auto_recalc_set(
		innodb_table,
		create_info->stats_auto_recalc == HA_STATS_AUTO_RECALC_ON,
		create_info->stats_auto_recalc == HA_STATS_AUTO_RECALC_OFF);

	innodb_table->stats_sample_pages = create_info->stats_sample_pages;
}

/*********************************************************************//**
Copy table flags from MySQL's TABLE_SHARE into an InnoDB table object.
Those flags are stored in .frm file and end up in the MySQL table object,
but are frequently used inside InnoDB so we keep their copies into the
InnoDB table object. */
void
innobase_copy_frm_flags_from_table_share(
/*=====================================*/
	dict_table_t*		innodb_table,	/*!< in/out: InnoDB table */
	const TABLE_SHARE*	table_share)	/*!< in: table share */
{
	ibool	ps_on;
	ibool	ps_off;

	if (dict_table_is_temporary(innodb_table)) {
		/* Temp tables do not use persistent stats */
		ps_on = FALSE;
		ps_off = TRUE;
	} else {
		ps_on = table_share->db_create_options
			& HA_OPTION_STATS_PERSISTENT;
		ps_off = table_share->db_create_options
			& HA_OPTION_NO_STATS_PERSISTENT;
	}

	dict_stats_set_persistent(innodb_table, ps_on, ps_off);

	dict_stats_auto_recalc_set(
		innodb_table,
		table_share->stats_auto_recalc == HA_STATS_AUTO_RECALC_ON,
		table_share->stats_auto_recalc == HA_STATS_AUTO_RECALC_OFF);

	innodb_table->stats_sample_pages = table_share->stats_sample_pages;
}

/*********************************************************************//**
Construct ha_innobase handler. */

ha_innobase::ha_innobase(
/*=====================*/
	handlerton*	hton,
	TABLE_SHARE*	table_arg)
	:handler(hton, table_arg),
	m_prebuilt(),
	m_prebuilt_ptr(&m_prebuilt),
	m_user_thd(),
	m_int_table_flags(HA_REC_NOT_IN_SEQ
			  | HA_NULL_IN_KEY
			  | HA_CAN_INDEX_BLOBS
			  | HA_CAN_SQL_HANDLER
			  | HA_PRIMARY_KEY_REQUIRED_FOR_POSITION
			  | HA_PRIMARY_KEY_IN_READ_INDEX
			  | HA_BINLOG_ROW_CAPABLE
			  | HA_CAN_GEOMETRY
			  | HA_PARTIAL_COLUMN_READ
			  | HA_TABLE_SCAN_ON_INDEX
			  | HA_CAN_FULLTEXT
			  | HA_CAN_FULLTEXT_EXT
			  | HA_CAN_FULLTEXT_HINTS
			  | HA_CAN_EXPORT
			  | HA_CAN_RTREEKEYS
			  | HA_HAS_RECORDS
			  | HA_NO_READ_LOCAL_LOCK
			  | HA_GENERATED_COLUMNS
			  | HA_ATTACHABLE_TRX_COMPATIBLE
			  | HA_CAN_INDEX_VIRTUAL_GENERATED_COLUMN
		  ),
	m_start_of_scan(),
	m_num_write_row(),
        m_mysql_has_locked()
{}

/*********************************************************************//**
Destruct ha_innobase handler. */

ha_innobase::~ha_innobase()
/*======================*/
{
}

/*********************************************************************//**
Updates the user_thd field in a handle and also allocates a new InnoDB
transaction handle if needed, and updates the transaction fields in the
m_prebuilt struct. */
void
ha_innobase::update_thd(
/*====================*/
	THD*	thd)	/*!< in: thd to use the handle */
{
	DBUG_ENTER("ha_innobase::update_thd");
	DBUG_PRINT("ha_innobase::update_thd", ("user_thd: %p -> %p",
		   m_user_thd, thd));

	/* The table should have been opened in ha_innobase::open(). */
	DBUG_ASSERT(m_prebuilt->table->n_ref_count > 0);

	trx_t*	trx = check_trx_exists(thd);

	TrxInInnoDB	trx_in_innodb(trx);

	ut_ad(dict_table_is_intrinsic(m_prebuilt->table)
	      || trx_in_innodb.is_aborted()
	      || (trx->dict_operation_lock_mode == 0
		  && trx->dict_operation == TRX_DICT_OP_NONE));

	if (m_prebuilt->trx != trx) {

		row_update_prebuilt_trx(m_prebuilt, trx);
	}

	m_user_thd = thd;

	DBUG_ASSERT(m_prebuilt->trx->magic_n == TRX_MAGIC_N);
	DBUG_ASSERT(m_prebuilt->trx == thd_to_trx(m_user_thd));

	DBUG_VOID_RETURN;
}

/*********************************************************************//**
Updates the user_thd field in a handle and also allocates a new InnoDB
transaction handle if needed, and updates the transaction fields in the
m_prebuilt struct. */

void
ha_innobase::update_thd()
/*=====================*/
{
	THD*	thd = ha_thd();

	ut_ad(EQ_CURRENT_THD(thd));
	update_thd(thd);
}

/*********************************************************************//**
Registers an InnoDB transaction with the MySQL 2PC coordinator, so that
the MySQL XA code knows to call the InnoDB prepare and commit, or rollback
for the transaction. This MUST be called for every transaction for which
the user may call commit or rollback. Calling this several times to register
the same transaction is allowed, too. This function also registers the
current SQL statement. */
static inline
void
innobase_register_trx(
/*==================*/
	handlerton*	hton,	/* in: Innobase handlerton */
	THD*		thd,	/* in: MySQL thd (connection) object */
	trx_t*		trx)	/* in: transaction to register */
{
	const ulonglong	trx_id = static_cast<const ulonglong>(
		trx_get_id_for_print(trx));

	trans_register_ha(thd, FALSE, hton, &trx_id);

	if (!trx_is_registered_for_2pc(trx)
	    && thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

		trans_register_ha(thd, TRUE, hton, &trx_id);
	}

	trx_register_for_2pc(trx);
}

/*	BACKGROUND INFO: HOW THE MYSQL QUERY CACHE WORKS WITH INNODB
	------------------------------------------------------------

1) The use of the query cache for TBL is disabled when there is an
uncommitted change to TBL.

2) When a change to TBL commits, InnoDB stores the current value of
its global trx id counter, let us denote it by INV_TRX_ID, to the table object
in the InnoDB data dictionary, and does only allow such transactions whose
id <= INV_TRX_ID to use the query cache.

3) When InnoDB does an INSERT/DELETE/UPDATE to a table TBL, or an implicit
modification because an ON DELETE CASCADE, we invalidate the MySQL query cache
of TBL immediately.

How this is implemented inside InnoDB:

1) Since every modification always sets an IX type table lock on the InnoDB
table, it is easy to check if there can be uncommitted modifications for a
table: just check if there are locks in the lock list of the table.

2) When a transaction inside InnoDB commits, it reads the global trx id
counter and stores the value INV_TRX_ID to the tables on which it had a lock.

3) If there is an implicit table change from ON DELETE CASCADE or SET NULL,
InnoDB calls an invalidate method for the MySQL query cache for that table.

How this is implemented inside sql_cache.cc:

1) The query cache for an InnoDB table TBL is invalidated immediately at an
INSERT/UPDATE/DELETE, just like in the case of MyISAM. No need to delay
invalidation to the transaction commit.

2) To store or retrieve a value from the query cache of an InnoDB table TBL,
any query must first ask InnoDB's permission. We must pass the thd as a
parameter because InnoDB will look at the trx id, if any, associated with
that thd. Also the full_name which is used as key to search for the table
object. The full_name is a string containing the normalized path to the
table in the canonical format.

3) Use of the query cache for InnoDB tables is now allowed also when
AUTOCOMMIT==0 or we are inside BEGIN ... COMMIT. Thus transactions no longer
put restrictions on the use of the query cache.
*/

/******************************************************************//**
The MySQL query cache uses this to check from InnoDB if the query cache at
the moment is allowed to operate on an InnoDB table. The SQL query must
be a non-locking SELECT.

The query cache is allowed to operate on certain query only if this function
returns TRUE for all tables in the query.

If thd is not in the autocommit state, this function also starts a new
transaction for thd if there is no active trx yet, and assigns a consistent
read view to it if there is no read view yet.

Why a deadlock of threads is not possible: the query cache calls this function
at the start of a SELECT processing. Then the calling thread cannot be
holding any InnoDB semaphores. The calling thread is holding the
query cache mutex, and this function will reserve the InnoDB trx_sys->mutex.
Thus, the 'rank' in sync0mutex.h of the MySQL query cache mutex is above
the InnoDB trx_sys->mutex.
@return TRUE if permitted, FALSE if not; note that the value FALSE
does not mean we should invalidate the query cache: invalidation is
called explicitly */
static
my_bool
innobase_query_caching_of_table_permitted(
/*======================================*/
	THD*	thd,		/*!< in: thd of the user who is trying to
				store a result to the query cache or
				retrieve it */
	char*	full_name,	/*!< in: normalized path to the table */
	uint	full_name_len,	/*!< in: length of the normalized path
				to the table */
	ulonglong *unused)	/*!< unused for this engine */
{
	bool	is_autocommit;
	char	norm_name[1000];
	trx_t*	trx = check_trx_exists(thd);

	ut_a(full_name_len < 999);

	if (trx->isolation_level == TRX_ISO_SERIALIZABLE) {
		/* In the SERIALIZABLE mode we add LOCK IN SHARE MODE to every
		plain SELECT if AUTOCOMMIT is not on. */

		return(static_cast<my_bool>(false));
	}

	if (trx->has_search_latch) {
		sql_print_error("The calling thread is holding the adaptive"
				" search, latch though calling"
				" innobase_query_caching_of_table_permitted.");
		trx_print(stderr, trx, 1024);
	}

	trx_search_latch_release_if_reserved(trx);

	innobase_srv_conc_force_exit_innodb(trx);

	if (!thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

		is_autocommit = true;
	} else {
		is_autocommit = false;

	}

	if (is_autocommit && trx->n_mysql_tables_in_use == 0) {
		/* We are going to retrieve the query result from the query
		cache. This cannot be a store operation to the query cache
		because then MySQL would have locks on tables already.

		TODO: if the user has used LOCK TABLES to lock the table,
		then we open a transaction in the call of row_.. below.
		That trx can stay open until UNLOCK TABLES. The same problem
		exists even if we do not use the query cache. MySQL should be
		modified so that it ALWAYS calls some cleanup function when
		the processing of a query ends!

		We can imagine we instantaneously serialize this consistent
		read trx to the current trx id counter. If trx2 would have
		changed the tables of a query result stored in the cache, and
		trx2 would have already committed, making the result obsolete,
		then trx2 would have already invalidated the cache. Thus we
		can trust the result in the cache is ok for this query. */

		return((my_bool)TRUE);
	}

	/* Normalize the table name to InnoDB format */
	normalize_table_name(norm_name, full_name);

	innobase_register_trx(innodb_hton_ptr, thd, trx);

	if (row_search_check_if_query_cache_permitted(trx, norm_name)) {

		return(static_cast<my_bool>(true));
	}

	return(static_cast<my_bool>(false));
}

/*****************************************************************//**
Invalidates the MySQL query cache for the table. */
void
innobase_invalidate_query_cache(
/*============================*/
	trx_t*		trx,		/*!< in: transaction which
					modifies the table */
	const char*	full_name,	/*!< in: concatenation of
					database name, path separator,
					table name, null char NUL;
					NOTE that in Windows this is
					always in LOWER CASE! */
	ulint		full_name_len)	/*!< in: full name length where
					also the null chars count */
{
	/* Note that the sync0mutex.h rank of the query cache mutex is just
	above the InnoDB trx_sys_t->lock. The caller of this function must
	not have latches of a lower rank. */

	/* Argument TRUE below means we are using transactions */
	mysql_query_cache_invalidate4(trx->mysql_thd,
				      full_name,
				      (uint32) full_name_len,
				      TRUE);
}

/** Quote a standard SQL identifier like tablespace, index or column name.
@param[in]	file	output stream
@param[in]	trx	InnoDB transaction, or NULL
@param[in]	id	identifier to quote */
void
innobase_quote_identifier(
	FILE*		file,
	trx_t*		trx,
	const char*	id)
{
	const int	q = trx != NULL && trx->mysql_thd != NULL
		? get_quote_char_for_identifier(trx->mysql_thd, id, strlen(id))
		: '`';

	if (q == EOF) {
		fputs(id, file);
	} else {
		putc(q, file);

		while (int c = *id++) {
			if (c == q) {
				putc(c, file);
			}
			putc(c, file);
		}

		putc(q, file);
	}
}

/** Convert a table name to the MySQL system_charset_info (UTF-8)
and quote it.
@param[out]	buf	buffer for converted identifier
@param[in]	buflen	length of buf, in bytes
@param[in]	id	identifier to convert
@param[in]	idlen	length of id, in bytes
@param[in]	thd	MySQL connection thread, or NULL
@return pointer to the end of buf */
char*
innobase_convert_identifier(
	char*		buf,
	ulint		buflen,
	const char*	id,
	ulint		idlen,
	THD*		thd)
{
	const char*	s	= id;

	char nz[MAX_TABLE_NAME_LEN + 1];
	char nz2[MAX_TABLE_NAME_LEN + 1];

	/* Decode the table name.  The MySQL function expects
	a NUL-terminated string.  The input and output strings
	buffers must not be shared. */
	ut_a(idlen <= MAX_TABLE_NAME_LEN);
	memcpy(nz, id, idlen);
	nz[idlen] = 0;

	s = nz2;
	idlen = explain_filename(thd, nz, nz2, sizeof nz2,
				 EXPLAIN_PARTITIONS_AS_COMMENT);
	if (idlen > buflen) {
		idlen = buflen;
	}
	memcpy(buf, s, idlen);
	return(buf + idlen);
}

/*****************************************************************//**
Convert a table name to the MySQL system_charset_info (UTF-8).
@return pointer to the end of buf */
char*
innobase_convert_name(
/*==================*/
	char*		buf,	/*!< out: buffer for converted identifier */
	ulint		buflen,	/*!< in: length of buf, in bytes */
	const char*	id,	/*!< in: table name to convert */
	ulint		idlen,	/*!< in: length of id, in bytes */
	THD*		thd)	/*!< in: MySQL connection thread, or NULL */
{
	char*		s	= buf;
	const char*	bufend	= buf + buflen;

	const char*	slash = (const char*) memchr(id, '/', idlen);

	if (slash == NULL) {
		return(innobase_convert_identifier(
				buf, buflen, id, idlen, thd));
	}

	/* Print the database name and table name separately. */
	s = innobase_convert_identifier(s, bufend - s, id, slash - id, thd);
	if (s < bufend) {
		*s++ = '.';
		s = innobase_convert_identifier(s, bufend - s,
						slash + 1, idlen
						- (slash - id) - 1,
						thd);
	}

	return(s);
}

/*****************************************************************//**
A wrapper function of innobase_convert_name(), convert a table name
to the MySQL system_charset_info (UTF-8) and quote it if needed.
@return pointer to the end of buf */
void
innobase_format_name(
/*==================*/
	char*		buf,	/*!< out: buffer for converted identifier */
	ulint		buflen,	/*!< in: length of buf, in bytes */
	const char*	name)	/*!< in: table name to format */
{
	const char*     bufend;

	bufend = innobase_convert_name(buf, buflen, name, strlen(name), NULL);

	ut_ad((ulint) (bufend - buf) < buflen);

	buf[bufend - buf] = '\0';
}

/**********************************************************************//**
Determines if the currently running transaction has been interrupted.
@return TRUE if interrupted */
ibool
trx_is_interrupted(
/*===============*/
	const trx_t*	trx)	/*!< in: transaction */
{
	return(trx && trx->mysql_thd && thd_killed(trx->mysql_thd));
}

/**********************************************************************//**
Determines if the currently running transaction is in strict mode.
@return TRUE if strict */
ibool
trx_is_strict(
/*==========*/
	trx_t*	trx)	/*!< in: transaction */
{
	return(trx && trx->mysql_thd && THDVAR(trx->mysql_thd, strict_mode));
}

/**************************************************************//**
Resets some fields of a m_prebuilt struct. The template is used in fast
retrieval of just those column values MySQL needs in its processing. */
void
ha_innobase::reset_template(void)
/*=============================*/
{
	ut_ad(m_prebuilt->magic_n == ROW_PREBUILT_ALLOCATED);
	ut_ad(m_prebuilt->magic_n2 == m_prebuilt->magic_n);

	/* Force table to be freed in close_thread_table(). */
	DBUG_EXECUTE_IF("free_table_in_fts_query",
		if (m_prebuilt->in_fts_query) {
			table->m_needs_reopen = true;
		}
	);

	m_prebuilt->keep_other_fields_on_keyread = 0;
	m_prebuilt->read_just_key = 0;
	m_prebuilt->in_fts_query = 0;

	/* Reset index condition pushdown state. */
	if (m_prebuilt->idx_cond) {
		m_prebuilt->idx_cond = NULL;
		m_prebuilt->idx_cond_n_cols = 0;
		/* Invalidate m_prebuilt->mysql_template
		in ha_innobase::write_row(). */
		m_prebuilt->template_type = ROW_MYSQL_NO_TEMPLATE;
	}
}

/*****************************************************************//**
Call this when you have opened a new table handle in HANDLER, before you
call index_read_map() etc. Actually, we can let the cursor stay open even
over a transaction commit! Then you should call this before every operation,
fetch next etc. This function inits the necessary things even after a
transaction commit. */

void
ha_innobase::init_table_handle_for_HANDLER(void)
/*============================================*/
{
	/* If current thd does not yet have a trx struct, create one.
	If the current handle does not yet have a m_prebuilt struct, create
	one. Update the trx pointers in the m_prebuilt struct. Normally
	this operation is done in external_lock. */

	update_thd(ha_thd());

	/* Initialize the m_prebuilt struct much like it would be inited in
	external_lock */

	trx_search_latch_release_if_reserved(m_prebuilt->trx);

	innobase_srv_conc_force_exit_innodb(m_prebuilt->trx);

	/* If the transaction is not started yet, start it */

	trx_start_if_not_started_xa(m_prebuilt->trx, false);

	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	/* Assign a read view if the transaction does not have it yet */

	trx_assign_read_view(m_prebuilt->trx);

	innobase_register_trx(ht, m_user_thd, m_prebuilt->trx);

	/* We did the necessary inits in this function, no need to repeat them
	in row_search_for_mysql */

	m_prebuilt->sql_stat_start = FALSE;

	/* We let HANDLER always to do the reads as consistent reads, even
	if the trx isolation level would have been specified as SERIALIZABLE */

	m_prebuilt->select_lock_type = LOCK_NONE;
	m_prebuilt->stored_select_lock_type = LOCK_NONE;

	/* Always fetch all columns in the index record */

	m_prebuilt->hint_need_to_fetch_extra_cols = ROW_RETRIEVE_ALL_COLS;

	/* We want always to fetch all columns in the whole row? Or do
	we???? */

	m_prebuilt->used_in_HANDLER = TRUE;

	reset_template();
}

/*********************************************************************//**
Free tablespace resources allocated. */
static
void
innobase_space_shutdown()
/*=====================*/
{
	DBUG_ENTER("innobase_space_shutdown");

	srv_sys_space.shutdown();
	if (srv_tmp_space.get_sanity_check_status()) {
		fil_space_close(srv_tmp_space.name());
		srv_tmp_space.delete_files();
	}
	srv_tmp_space.shutdown();

	DBUG_VOID_RETURN;
}

/*********************************************************************//**
Free any resources that were allocated and return failure.
@return always return 1 */
static
int
innobase_init_abort()
/*=================*/
{
	DBUG_ENTER("innobase_init_abort");
	innobase_space_shutdown();
	DBUG_RETURN(1);
}


/*****************************************************************//**
This function checks if the given db.tablename is a system table
supported by Innodb and is used as an initializer for the data member
is_supported_system_table of InnoDB storage engine handlerton.
Currently we support only plugin, servers,  help- and time_zone- related
system tables in InnoDB. Please don't add any SE-specific system tables here.

@param db				database name to check.
@param table_name			table name to check.
@param is_sql_layer_system_table	if the supplied db.table_name is a SQL
					layer system table.
*/

static bool innobase_is_supported_system_table(const char *db,
						const char *table_name,
						bool is_sql_layer_system_table)
{
	static const char* supported_system_tables[]= { "help_topic",
							"help_category",
							"help_relation",
							"help_keyword",
							"plugin",
							"servers",
							"time_zone",
							"time_zone_leap_second",
							"time_zone_name",
							"time_zone_transition",
							"time_zone_transition_type",
							(const char *)NULL };

	if (!is_sql_layer_system_table)
		return false;

	for (unsigned i= 0; supported_system_tables[i] != NULL; ++i)
	{
		if (!strcmp(table_name, supported_system_tables[i]))
			return true;
	}

	return false;
}

/* mutex protecting the master_key_id */
ib_mutex_t	master_key_id_mutex;

/** Rotate the encrypted tablespace keys according to master key
rotation.
@return false on success, true on failure */
bool
innobase_encryption_key_rotation()
{
	byte*	master_key = NULL;
	bool	ret = FALSE;

	/* Require the mutex to block other rotate request. */
	mutex_enter(&master_key_id_mutex);

	/* Check if keyring loaded and the currently master key
	can be fetched. */
	if (Encryption::master_key_id != 0) {
		Encryption::get_master_key(Encryption::master_key_id,
					   &master_key);
		if (master_key == NULL) {
			mutex_exit(&master_key_id_mutex);
			my_error(ER_CANNOT_FIND_KEY_IN_KEYRING, MYF(0));
			return(true);
		}
		my_free(master_key);
	}

	master_key = NULL;

	/* Generate the new master key. */
	Encryption::create_master_key(&master_key);

        if (master_key == NULL) {
		my_error(ER_CANNOT_FIND_KEY_IN_KEYRING, MYF(0));
		mutex_exit(&master_key_id_mutex);
                return(true);
        }

	ret = !fil_encryption_rotate();

	my_free(master_key);

	/* If rotation failure, return error */
	if (ret) {
		my_error(ER_CANNOT_FIND_KEY_IN_KEYRING, MYF(0));
	}

	/* Release the mutex. */
	mutex_exit(&master_key_id_mutex);

	return(ret);
}

/** Return partitioning flags. */
static uint innobase_partition_flags()
{
	return(HA_CAN_EXCHANGE_PARTITION | HA_CANNOT_PARTITION_FK);
}

/** Deprecation message about InnoDB file format related parameters */
#define DEPRECATED_FORMAT_PARAMETER(x)					\
	"Using " x " is deprecated and the parameter"			\
	" may be removed in future releases."				\
	" See " REFMAN "innodb-file-format.html"

/** Deprecation message about innodb_file_format */
static const char*	deprecated_file_format
	= DEPRECATED_FORMAT_PARAMETER("innodb_file_format");
/** Deprecation message about innodb_large_prefix */
static const char*	deprecated_large_prefix
	= DEPRECATED_FORMAT_PARAMETER("innodb_large_prefix");
/** Deprecation message about innodb_file_format_check */
static const char*	deprecated_file_format_check
	= DEPRECATED_FORMAT_PARAMETER("innodb_file_format_check");
/** Deprecation message about innodb_file_format_max */
static const char*	deprecated_file_format_max
	= DEPRECATED_FORMAT_PARAMETER("innodb_file_format_max");

/** Update log_checksum_algorithm_ptr with a pointer to the function
corresponding to whether checksums are enabled.
@param[in]	check	whether redo log block checksums are enabled */
static
void
innodb_log_checksums_func_update(bool	check)
{
	log_checksum_algorithm_ptr = check
		? log_block_calc_checksum_crc32
		: log_block_calc_checksum_none;
}

/*********************************************************************//**
Opens an InnoDB database.
@return 0 on success, 1 on failure */
static
int
innobase_init(
/*==========*/
	void	*p)	/*!< in: InnoDB handlerton */
{
	static char	current_dir[3];		/*!< Set if using current lib */
	int		err;
	char		*default_path;
	uint		format_id;
	ulong		num_pll_degree;

	DBUG_ENTER("innobase_init");
	handlerton* innobase_hton= (handlerton*) p;
	innodb_hton_ptr = innobase_hton;

	innobase_hton->state = SHOW_OPTION_YES;
	innobase_hton->db_type = DB_TYPE_INNODB;
	innobase_hton->savepoint_offset = sizeof(trx_named_savept_t);
	innobase_hton->close_connection = innobase_close_connection;
	innobase_hton->kill_connection = innobase_kill_connection;
	innobase_hton->savepoint_set = innobase_savepoint;
	innobase_hton->savepoint_rollback = innobase_rollback_to_savepoint;

	innobase_hton->savepoint_rollback_can_release_mdl =
				innobase_rollback_to_savepoint_can_release_mdl;

	innobase_hton->savepoint_release = innobase_release_savepoint;
	innobase_hton->commit = innobase_commit;
	innobase_hton->rollback = innobase_rollback;
	innobase_hton->prepare = innobase_xa_prepare;
	innobase_hton->recover = innobase_xa_recover;
	innobase_hton->commit_by_xid = innobase_commit_by_xid;
	innobase_hton->rollback_by_xid = innobase_rollback_by_xid;
	innobase_hton->create = innobase_create_handler;
	innobase_hton->alter_tablespace = innobase_alter_tablespace;
	innobase_hton->drop_database = innobase_drop_database;
	innobase_hton->panic = innobase_end;
	innobase_hton->partition_flags= innobase_partition_flags;

	innobase_hton->start_consistent_snapshot =
		innobase_start_trx_and_assign_read_view;
	innobase_hton->clone_consistent_snapshot =
		innobase_start_trx_and_clone_read_view;

	innobase_hton->store_binlog_info =
		innobase_store_binlog_info;

	innobase_hton->flush_logs = innobase_flush_logs;
	innobase_hton->show_status = innobase_show_status;
	innobase_hton->fill_is_table = innobase_fill_i_s_table;
	innobase_hton->flags =
		HTON_SUPPORTS_EXTENDED_KEYS | HTON_SUPPORTS_FOREIGN_KEYS |
		HTON_SUPPORTS_ONLINE_BACKUPS;

	innobase_hton->release_temporary_latches =
		innobase_release_temporary_latches;
        innobase_hton->replace_native_transaction_in_thd =
                innodb_replace_trx_in_thd;
	innobase_hton->data = &innodb_api_cb;
	innobase_hton->flush_changed_page_bitmaps
		= innobase_flush_changed_page_bitmaps;
	innobase_hton->purge_changed_page_bitmaps
		= innobase_purge_changed_page_bitmaps;

	innobase_hton->is_supported_system_table=
		innobase_is_supported_system_table;

	innobase_hton->rotate_encryption_master_key =
		innobase_encryption_key_rotation;

	ut_a(DATA_MYSQL_TRUE_VARCHAR == (ulint)MYSQL_TYPE_VARCHAR);

#ifndef DBUG_OFF
	static const char	test_filename[] = "-@";
	char			test_tablename[sizeof test_filename
				+ sizeof(srv_mysql50_table_name_prefix) - 1];
	if ((sizeof(test_tablename)) - 1
			!= filename_to_tablename(test_filename,
						 test_tablename,
						 sizeof(test_tablename), true)
			|| strncmp(test_tablename,
				   srv_mysql50_table_name_prefix,
				   sizeof(srv_mysql50_table_name_prefix) - 1)
			|| strcmp(test_tablename
				  + sizeof(srv_mysql50_table_name_prefix) - 1,
				  test_filename)) {

		sql_print_error("tablename encoding has been changed");
		DBUG_RETURN(innobase_init_abort());
	}
#endif /* DBUG_OFF */

	/* Check that values don't overflow on 32-bit systems. */
	if (sizeof(ulint) == 4) {
		if (innobase_buffer_pool_size > UINT_MAX32) {
			sql_print_error(
				"innodb_buffer_pool_size can't be over 4GB"
				" on 32-bit systems");

			DBUG_RETURN(innobase_init_abort());
		}
	}

	os_file_set_umask(my_umask);

	/* Setup the memory alloc/free tracing mechanisms before calling
	any functions that could possibly allocate memory. */
	ut_new_boot();

	/* First calculate the default path for innodb_data_home_dir etc.,
	in case the user has not given any value.

	Note that when using the embedded server, the datadirectory is not
	necessarily the current directory of this program. */

	if (mysqld_embedded) {
		default_path = mysql_real_data_home;
	} else {
		/* It's better to use current lib, to keep paths short */
		current_dir[0] = FN_CURLIB;
		current_dir[1] = FN_LIBCHAR;
		current_dir[2] = 0;
		default_path = current_dir;
	}

	ut_a(default_path);

	fil_path_to_mysql_datadir = default_path;
	folder_mysql_datadir = fil_path_to_mysql_datadir;

	/* Set InnoDB initialization parameters according to the values
	read from MySQL .cnf file */

	/* The default dir for data files is the datadir of MySQL */

	srv_data_home = innobase_data_home_dir
		? innobase_data_home_dir : default_path;

	/*--------------- Shared tablespaces -------------------------*/

	/* Check that the value of system variable innodb_page_size was
	set correctly.  Its value was put into srv_page_size. If valid,
	return the associated srv_page_size_shift. */
	srv_page_size_shift = innodb_page_size_validate(srv_page_size);
	if (!srv_page_size_shift) {
		sql_print_error("InnoDB: Invalid page size=%lu.\n",
				srv_page_size);
		DBUG_RETURN(innobase_init_abort());
	}

	/* Set default InnoDB temp data file size to 12 MB and let it be
	auto-extending. */
	if (!innobase_data_file_path) {
		innobase_data_file_path = (char*) "ibdata1:12M:autoextend";
	}

	/* This is the first time univ_page_size is used.
	It was initialized to 16k pages before srv_page_size was set */
	univ_page_size.copy_from(
		page_size_t(srv_page_size, srv_page_size, false));

	srv_sys_space.set_space_id(TRX_SYS_SPACE);

	/* Create the filespace flags. */
	ulint	fsp_flags = fsp_flags_init(
		univ_page_size, false, false, false, false);
	srv_sys_space.set_flags(fsp_flags);

	srv_sys_space.set_name(reserved_system_space_name);
	srv_sys_space.set_path(srv_data_home);

	/* Supports raw devices */
	if (!srv_sys_space.parse_params(innobase_data_file_path, true)) {
		DBUG_RETURN(innobase_init_abort());
	}

	/* Set default InnoDB temp data file size to 12 MB and let it be
	auto-extending. */

	if (!innobase_temp_data_file_path) {
		innobase_temp_data_file_path = (char*) "ibtmp1:12M:autoextend";
	}

	/* We set the temporary tablspace id later, after recovery.
	The temp tablespace doesn't support raw devices.
	Set the name and path. */
	srv_tmp_space.set_name(reserved_temporary_space_name);
	srv_tmp_space.set_path(srv_data_home);

	/* Create the filespace flags with the temp flag set. */
	fsp_flags = fsp_flags_init(
		univ_page_size, false, false, false, true);
	srv_tmp_space.set_flags(fsp_flags);

	if (!srv_tmp_space.parse_params(innobase_temp_data_file_path, false)) {
		DBUG_RETURN(innobase_init_abort());
	}

	/* Perform all sanity check before we take action of deleting files*/
	if (srv_sys_space.intersection(&srv_tmp_space)) {
		sql_print_error("%s and %s file names seem to be the same.",
			srv_tmp_space.name(), srv_sys_space.name());
		DBUG_RETURN(innobase_init_abort());
	}

	/* ------------ UNDO tablespaces files ---------------------*/
	if (!srv_undo_dir) {
		srv_undo_dir = default_path;
	}

	os_normalize_path(srv_undo_dir);

	if (strchr(srv_undo_dir, ';')) {
		sql_print_error("syntax error in innodb_undo_directory");
		DBUG_RETURN(innobase_init_abort());
	}

	/* -------------- All log files ---------------------------*/

	/* The default dir for log files is the datadir of MySQL */

	if (!srv_log_group_home_dir) {
		srv_log_group_home_dir = default_path;
	}

	os_normalize_path(srv_log_group_home_dir);

	if (strchr(srv_log_group_home_dir, ';')) {
		sql_print_error("syntax error in innodb_log_group_home_dir");
		DBUG_RETURN(innobase_init_abort());
	}

	if (!innobase_large_prefix) {
		ib::warn() << deprecated_large_prefix;
	}

	if (!THDVAR(NULL, support_xa)) {
		ib::warn() << deprecated_innodb_support_xa_off;
		THDVAR(NULL, support_xa) = TRUE;
	}

	if (innobase_file_format_name != innodb_file_format_default) {
		ib::warn() << deprecated_file_format;
	}

	/* Validate the file format by animal name */
	if (innobase_file_format_name != NULL) {

		format_id = innobase_file_format_name_lookup(
			innobase_file_format_name);

		if (format_id > UNIV_FORMAT_MAX) {

			sql_print_error("InnoDB: wrong innodb_file_format.");

		DBUG_RETURN(innobase_init_abort());
		}
	} else {
		/* Set it to the default file format id. Though this
		should never happen. */
		format_id = 0;
	}

	srv_file_format = format_id;

	/* Given the type of innobase_file_format_name we have little
	choice but to cast away the constness from the returned name.
	innobase_file_format_name is used in the MySQL set variable
	interface and so can't be const. */

	innobase_file_format_name =
		(char*) trx_sys_file_format_id_to_name(format_id);

	/* Check innobase_file_format_check variable */
	if (!innobase_file_format_check) {
		ib::warn() << deprecated_file_format_check;

		/* Set the value to disable checking. */
		srv_max_file_format_at_startup = UNIV_FORMAT_MAX + 1;

	} else {

		/* Set the value to the lowest supported format. */
		srv_max_file_format_at_startup = UNIV_FORMAT_MIN;
	}

	if (innobase_file_format_max != innodb_file_format_max_default) {
		ib::warn() << deprecated_file_format_max;
	}

	/* Did the user specify a format name that we support?
	As a side effect it will update the variable
	srv_max_file_format_at_startup */
	if (innobase_file_format_validate_and_set(
			innobase_file_format_max) < 0) {

		sql_print_error("InnoDB: invalid"
				" innodb_file_format_max value:"
				" should be any value up to %s or its"
				" equivalent numeric id",
				trx_sys_file_format_id_to_name(
					UNIV_FORMAT_MAX));

		DBUG_RETURN(innobase_init_abort());
	}

	if (innobase_change_buffering) {
		ulint	use;

		for (use = 0;
		     use < UT_ARR_SIZE(innobase_change_buffering_values);
		     use++) {
			if (!innobase_strcasecmp(
				    innobase_change_buffering,
				    innobase_change_buffering_values[use])) {
				ibuf_use = (ibuf_use_t) use;
				goto innobase_change_buffering_inited_ok;
			}
		}

		sql_print_error("InnoDB: invalid value"
				" innodb_change_buffering=%s",
				innobase_change_buffering);
		DBUG_RETURN(innobase_init_abort());
	}

innobase_change_buffering_inited_ok:
	ut_a((ulint) ibuf_use < UT_ARR_SIZE(innobase_change_buffering_values));
	innobase_change_buffering = (char*)
		innobase_change_buffering_values[ibuf_use];

	/* Check that interdependent parameters have sane values. */
	if (srv_max_buf_pool_modified_pct < srv_max_dirty_pages_pct_lwm) {
		sql_print_warning("InnoDB: innodb_max_dirty_pages_pct_lwm"
				  " cannot be set higher than"
				  " innodb_max_dirty_pages_pct.\n"
				  "InnoDB: Setting"
				  " innodb_max_dirty_pages_pct_lwm to %lf\n",
				  srv_max_buf_pool_modified_pct);

		srv_max_dirty_pages_pct_lwm = srv_max_buf_pool_modified_pct;
	}

	if (srv_max_io_capacity == SRV_MAX_IO_CAPACITY_DUMMY_DEFAULT) {

		if (srv_io_capacity >= SRV_MAX_IO_CAPACITY_LIMIT / 2) {
			/* Avoid overflow. */
			srv_max_io_capacity = SRV_MAX_IO_CAPACITY_LIMIT;
		} else {
			/* The user has not set the value. We should
			set it based on innodb_io_capacity. */
			srv_max_io_capacity =
				ut_max(2 * srv_io_capacity, 2000UL);
		}

	} else if (srv_max_io_capacity < srv_io_capacity) {
		sql_print_warning("InnoDB: innodb_io_capacity"
				  " cannot be set higher than"
				  " innodb_io_capacity_max.\n"
				  "InnoDB: Setting"
				  " innodb_io_capacity to %lu\n",
				  srv_max_io_capacity);

		srv_io_capacity = srv_max_io_capacity;
	}

	if (!is_filename_allowed(srv_buf_dump_filename,
				 strlen(srv_buf_dump_filename), FALSE)) {
		sql_print_error("InnoDB: innodb_buffer_pool_filename"
			" cannot have colon (:) in the file name.");
		DBUG_RETURN(innobase_init_abort());
	}

	if (!is_filename_allowed(srv_parallel_doublewrite_path,
				 strlen(srv_parallel_doublewrite_path),
				 FALSE)) {
		sql_print_error("InnoDB: innodb_parallel_doublewrite_path"
				" cannot have colon (:) in the file name.");
		DBUG_RETURN(innobase_init_abort());
	}

	/* --------------------------------------------------*/

	srv_file_flush_method_str = innobase_file_flush_method;

	srv_log_file_size = (ib_uint64_t) innobase_log_file_size;

	if (UNIV_PAGE_SIZE_DEF != srv_page_size) {
		ib::warn() << "innodb-page-size has been changed from the"
			" default value " << UNIV_PAGE_SIZE_DEF << " to "
			<< srv_page_size << ".";
	}

	if (srv_log_write_ahead_size > srv_page_size) {
		srv_log_write_ahead_size = srv_page_size;
	} else {
		ulong	srv_log_write_ahead_size_tmp = OS_FILE_LOG_BLOCK_SIZE;

		while (srv_log_write_ahead_size_tmp
		       < srv_log_write_ahead_size) {
			srv_log_write_ahead_size_tmp
				= srv_log_write_ahead_size_tmp * 2;
		}
		if (srv_log_write_ahead_size_tmp
		    != srv_log_write_ahead_size) {
			srv_log_write_ahead_size
				= srv_log_write_ahead_size_tmp / 2;
		}
	}

	srv_log_buffer_size = (ulint) innobase_log_buffer_size;

	srv_buf_pool_size = (ulint) innobase_buffer_pool_size;

	srv_n_read_io_threads = (ulint) innobase_read_io_threads;
	srv_n_write_io_threads = (ulint) innobase_write_io_threads;

	srv_use_doublewrite_buf = (ibool) innobase_use_doublewrite;

	if (!innobase_use_checksums) {
		ib::warn() << "Setting innodb_checksums to OFF is DEPRECATED."
			" This option may be removed in future releases. You"
			" should set innodb_checksum_algorithm=NONE instead.";
		srv_checksum_algorithm = SRV_CHECKSUM_ALGORITHM_NONE;
	}

	innodb_log_checksums_func_update(innodb_log_checksums);

#ifdef HAVE_LINUX_LARGE_PAGES
	if ((os_use_large_pages = my_use_large_pages)) {
		os_large_page_size = opt_large_page_size;
	}
#endif

	row_rollback_on_timeout = (ibool) innobase_rollback_on_timeout;

	srv_locks_unsafe_for_binlog = (ibool) innobase_locks_unsafe_for_binlog;
	if (innobase_locks_unsafe_for_binlog) {
		ib::warn() << "Using innodb_locks_unsafe_for_binlog is"
			" DEPRECATED. This option may be removed in future"
			" releases. Please use READ COMMITTED transaction"
			" isolation level instead; " << SET_TRANSACTION_MSG;
	}

	if (innobase_open_files < 10) {
		innobase_open_files = 300;
		if (srv_file_per_table && table_cache_size > 300) {
			innobase_open_files = table_cache_size;
		}
	}
	srv_max_n_open_files = (ulint) innobase_open_files;
	srv_innodb_status = (ibool) innobase_create_status_file;

	srv_print_verbose_log = mysqld_embedded ? 0 : 1;

	/* Round up fts_sort_pll_degree to nearest power of 2 number */
	for (num_pll_degree = 1;
	     num_pll_degree < fts_sort_pll_degree;
	     num_pll_degree <<= 1) {

		/* No op */
	}

	fts_sort_pll_degree = num_pll_degree;

	/* Store the default charset-collation number of this MySQL
	installation */

	data_mysql_default_charset_coll = (ulint) default_charset_info->number;

	innobase_commit_concurrency_init_default();

	srv_kill_idle_transaction = 0;

	/* Do not enable backoff algorithm for small buffer pool. */
	if (!innodb_empty_free_list_algorithm_backoff_allowed(
			static_cast<srv_empty_free_list_t>(
				srv_empty_free_list_algorithm),
			innobase_buffer_pool_size / srv_page_size)) {
		sql_print_information(
				"InnoDB: innodb_empty_free_list_algorithm "
				"has been changed to legacy "
				"because of small buffer pool size. "
				"In order to use backoff, "
				"increase buffer pool at least up to 20MB.\n");
			srv_empty_free_list_algorithm
				= SRV_EMPTY_FREE_LIST_LEGACY;
	}

#ifdef HAVE_PSI_INTERFACE
	/* Register keys with MySQL performance schema */
	int	count;

	count = array_elements(all_pthread_mutexes);
	mysql_mutex_register("innodb", all_pthread_mutexes, count);

# ifdef UNIV_PFS_MUTEX
	count = array_elements(all_innodb_mutexes);
	mysql_mutex_register("innodb", all_innodb_mutexes, count);
# endif /* UNIV_PFS_MUTEX */

# ifdef UNIV_PFS_RWLOCK
	count = array_elements(all_innodb_rwlocks);
	mysql_rwlock_register("innodb", all_innodb_rwlocks, count);
# endif /* UNIV_PFS_MUTEX */

# ifdef UNIV_PFS_THREAD
	count = array_elements(all_innodb_threads);
	mysql_thread_register("innodb", all_innodb_threads, count);
# endif /* UNIV_PFS_THREAD */

# ifdef UNIV_PFS_IO
	count = array_elements(all_innodb_files);
	mysql_file_register("innodb", all_innodb_files, count);
# endif /* UNIV_PFS_IO */

	count = array_elements(all_innodb_conds);
	mysql_cond_register("innodb", all_innodb_conds, count);
#endif /* HAVE_PSI_INTERFACE */

	/* Set buffer pool size to default for fast startup when mysqld is
	run with --help --verbose options. */
	ulint	srv_buf_pool_size_org = 0;
	if (opt_help && opt_verbose
	    && srv_buf_pool_size > srv_buf_pool_def_size) {
		ib::warn() << "Setting innodb_buf_pool_size to "
			<< srv_buf_pool_def_size << " for fast startup, "
			<< "when running with --help --verbose options.";
		srv_buf_pool_size_org = srv_buf_pool_size;
		srv_buf_pool_size = srv_buf_pool_def_size;
	}

	/* Since we in this module access directly the fields of a trx
	struct, and due to different headers and flags it might happen that
	ib_mutex_t has a different size in this module and in InnoDB
	modules, we check at run time that the size is the same in
	these compilation modules. */

	err = innobase_start_or_create_for_mysql();

	/* Create mutex to protect encryption master_key_id. */
	mutex_create(LATCH_ID_MASTER_KEY_ID_MUTEX, &master_key_id_mutex);

	if (srv_buf_pool_size_org != 0) {
		/* Set the original value back to show in help. */
		srv_buf_pool_size_org =
			buf_pool_size_align(srv_buf_pool_size_org);
		innobase_buffer_pool_size =
			static_cast<long long>(srv_buf_pool_size_org);
	} else {
		innobase_buffer_pool_size =
			static_cast<long long>(srv_buf_pool_size);
	}

	if (err != DB_SUCCESS) {
		DBUG_RETURN(innobase_init_abort());
	}

	/* Adjust the innodb_undo_logs config object */
	innobase_undo_logs_init_default_max();

	innobase_old_blocks_pct = static_cast<uint>(
		buf_LRU_old_ratio_update(innobase_old_blocks_pct, TRUE));

	ibuf_max_size_update(srv_change_buffer_max_size);

	innobase_open_tables = hash_create(200);
	mysql_mutex_init(innobase_share_mutex_key,
			 &innobase_share_mutex,
			 MY_MUTEX_INIT_FAST);
	mysql_mutex_init(commit_cond_mutex_key,
			 &commit_cond_m, MY_MUTEX_INIT_FAST);
	mysql_cond_init(commit_cond_key, &commit_cond);

	innodb_inited= 1;
#ifdef MYSQL_DYNAMIC_PLUGIN
	if (innobase_hton != p) {
		innobase_hton = reinterpret_cast<handlerton*>(p);
		*innobase_hton = *innodb_hton_ptr;
	}
#endif /* MYSQL_DYNAMIC_PLUGIN */

	/* Get the current high water mark format. */
	innobase_file_format_max = (char*) trx_sys_file_format_max_get();

	/* Currently, monitor counter information are not persistent. */
	memset(monitor_set_tbl, 0, sizeof monitor_set_tbl);

	memset(innodb_counter_value, 0, sizeof innodb_counter_value);

	/* Do this as late as possible so server is fully starts up,
	since  we might get some initial stats if user choose to turn
	on some counters from start up */
	if (innobase_enable_monitor_counter) {
		innodb_enable_monitor_at_startup(
			innobase_enable_monitor_counter);
	}

	/* Turn on monitor counters that are default on */
	srv_mon_default_on();


	/* Unit Tests */
#ifdef UNIV_ENABLE_UNIT_TEST_GET_PARENT_DIR
	unit_test_os_file_get_parent_dir();
#endif /* UNIV_ENABLE_UNIT_TEST_GET_PARENT_DIR */

#ifdef UNIV_ENABLE_UNIT_TEST_MAKE_FILEPATH
	test_make_filepath();
#endif /*UNIV_ENABLE_UNIT_TEST_MAKE_FILEPATH */

#ifdef UNIV_ENABLE_DICT_STATS_TEST
	test_dict_stats_all();
#endif /*UNIV_ENABLE_DICT_STATS_TEST */

#ifdef UNIV_ENABLE_UNIT_TEST_ROW_RAW_FORMAT_INT
# ifdef HAVE_UT_CHRONO_T
	test_row_raw_format_int();
# endif /* HAVE_UT_CHRONO_T */
#endif /* UNIV_ENABLE_UNIT_TEST_ROW_RAW_FORMAT_INT */

	DBUG_RETURN(0);
}

/*******************************************************************//**
Closes an InnoDB database.
@return TRUE if error */
static
int
innobase_end(
/*=========*/
	handlerton*		hton,	/*!< in/out: InnoDB handlerton */
	ha_panic_function	type __attribute__((unused)))
					/*!< in: ha_panic() parameter */
{
	int	err= 0;

	DBUG_ENTER("innobase_end");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	if (innodb_inited) {

		srv_fast_shutdown = (ulint) innobase_fast_shutdown;

		innodb_inited = 0;
		hash_table_free(innobase_open_tables);
		innobase_open_tables = NULL;

		mutex_free(&master_key_id_mutex);
		if (innobase_shutdown_for_mysql() != DB_SUCCESS) {
			err = 1;
		}

		innobase_space_shutdown();

		mysql_mutex_destroy(&innobase_share_mutex);
		mysql_mutex_destroy(&commit_cond_m);
		mysql_cond_destroy(&commit_cond);
	}

	DBUG_RETURN(err);
}

/** Flush InnoDB redo logs to the file system.
@param[in]	hton			InnoDB handlerton
@param[in]	binlog_group_flush	true if we got invoked by binlog
group commit during flush stage, false in other cases.
@return false */
static
bool
innobase_flush_logs(
	handlerton*	hton,
	bool		binlog_group_flush)
{
	DBUG_ENTER("innobase_flush_logs");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	if (srv_read_only_mode) {
		DBUG_RETURN(false);
	}

	/* If !binlog_group_flush, we got invoked by FLUSH LOGS or similar.
	Else, we got invoked by binlog group commit during flush stage. */

	if (binlog_group_flush && thd_flush_log_at_trx_commit(NULL) == 0) {
		/* innodb_flush_log_at_trx_commit=0
		(write and sync once per second).
		Do not flush the redo log during binlog group commit. */
		DBUG_RETURN(false);
	}

	/* Flush the redo log buffer to the redo log file.
	Sync it to disc if we are in FLUSH LOGS, or if
	innodb_flush_log_at_trx_commit=1
	(write and sync at each commit). */
	log_buffer_flush_to_disk(!binlog_group_flush
				 || thd_flush_log_at_trx_commit(NULL) == 1);

	DBUG_RETURN(false);
}

/************************************************************//**
Synchronously read and parse the redo log up to the last
checkpoint to write the changed page bitmap.
@return 0 to indicate success.  Current implementation cannot fail. */
static
my_bool
innobase_flush_changed_page_bitmaps()
/*=================================*/
{
	if (srv_track_changed_pages) {
		os_event_reset(srv_checkpoint_completed_event);
		log_online_follow_redo_log();
	}
	return FALSE;
}

/************************************************************//**
Delete all the bitmap files for data less than the specified LSN.
If called with lsn == IB_ULONGLONG_MAX (i.e. set by RESET request),
restart the bitmap file sequence, otherwise continue it.
@return 0 to indicate success, 1 for failure. */
static
my_bool
innobase_purge_changed_page_bitmaps(
/*================================*/
	ulonglong lsn)	/*!< in: LSN to purge files up to */
{
	return (my_bool)log_online_purge_changed_page_bitmaps(lsn);
}

/*****************************************************************//**
Commits a transaction in an InnoDB database. */
void
innobase_commit_low(
/*================*/
	trx_t*	trx)	/*!< in: transaction handle */
{
	if (trx_is_started(trx)) {

		trx_commit_for_mysql(trx);
	}
	trx->will_lock = 0;
}

/*****************************************************************//**
Stores the current binlog coordinates in the trx system header. */
static
int
innobase_store_binlog_info(
/*=======================*/
	handlerton*	hton,	/*!< in: InnoDB handlerton */
	THD*		thd)	/*!< in: MySQL thread handle */
{
	const char*			file_name;
	unsigned long long 	pos;
	mtr_t			mtr;

	DBUG_ENTER("innobase_store_binlog_info");

	thd_binlog_pos(thd, &file_name, &pos);

	mtr_start(&mtr);

	trx_sys_update_mysql_binlog_offset(file_name, pos,
					   TRX_SYS_MYSQL_LOG_INFO, &mtr);

	mtr_commit(&mtr);

	innobase_flush_logs(hton, false);

	DBUG_RETURN(0);
}

/*****************************************************************//**
Creates an InnoDB transaction struct for the thd if it does not yet have one.
Starts a new InnoDB transaction if a transaction is not yet started. And
assigns a new snapshot for a consistent read if the transaction does not yet
have one.
@return 0 */
static
int
innobase_start_trx_and_assign_read_view(
/*====================================*/
	handlerton*	hton,	/*!< in: InnoDB handlerton */
	THD*		thd)	/*!< in: MySQL thread handle of the user for
				whom the transaction should be committed */
{
	DBUG_ENTER("innobase_start_trx_and_assign_read_view");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	/* Create a new trx struct for thd, if it does not yet have one */

	trx_t*	trx = check_trx_exists(thd);

	TrxInInnoDB	trx_in_innodb(trx);

	innobase_srv_conc_force_exit_innodb(trx);

	/* The transaction should not be active yet, start it */

	ut_ad(!trx_is_started(trx));

	trx_start_if_not_started_xa(trx, false);

	/* Assign a read view if the transaction does not have it yet.
	Do this only if transaction is using REPEATABLE READ isolation
	level. */
	trx->isolation_level = innobase_map_isolation_level(
		thd_get_trx_isolation(thd));

	if (trx->isolation_level == TRX_ISO_REPEATABLE_READ) {
		trx_assign_read_view(trx);
	} else {
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    HA_ERR_UNSUPPORTED,
				    "InnoDB: WITH CONSISTENT SNAPSHOT"
				    " was ignored because this phrase"
				    " can only be used with"
				    " REPEATABLE READ isolation level.");
	}

	/* Set the MySQL flag to mark that there is an active transaction */

	innobase_register_trx(hton, current_thd, trx);

	DBUG_RETURN(0);
}


/*****************************************************************//**
Creates an InnoDB transaction struct for the thd if it does not yet have one.
Starts a new InnoDB transaction if a transaction is not yet started. And
clones snapshot for a consistent read from another session, if it has one.
@return	0 */
static
int
innobase_start_trx_and_clone_read_view(
/*====================================*/
	handlerton*	hton,		/* in: Innodb handlerton */
	THD*		thd,		/* in: MySQL thread handle of the
					user for whom the transaction should
					be committed */
	THD*		from_thd)	/* in: MySQL thread handle of the
					user session from which the consistent
					read should be cloned */
{
	trx_t*	trx;
	trx_t*	from_trx;

	DBUG_ENTER("innobase_start_trx_and_clone_read_view");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	/* Get transaction handle from the donor session */

	from_trx = thd_to_trx(from_thd);

	if (!from_trx) {
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    HA_ERR_UNSUPPORTED,
				    "InnoDB: WITH CONSISTENT SNAPSHOT "
				    "FROM SESSION was ignored because the "
				    "specified session does not have an open "
				    "transaction inside InnoDB.");

		DBUG_RETURN(0);
	}

	/* Create a new trx struct for thd, if it does not yet have one */

	trx = check_trx_exists(thd);

	/* This is just to play safe: release a possible FIFO ticket and
	search latch. Since we can potentially reserve the trx_sys->mutex,
	we have to release the search system latch first to obey the latching
	order. */

	trx_search_latch_release_if_reserved(trx);

	innobase_srv_conc_force_exit_innodb(trx);

	/* If the transaction is not started yet, start it */

	trx_start_if_not_started_xa(trx, false);

	/* Clone the read view from the donor transaction.  Do this only if
	transaction is using REPEATABLE READ isolation level. */
	trx->isolation_level = innobase_map_isolation_level(
		thd_get_trx_isolation(thd));

	if (trx->isolation_level != TRX_ISO_REPEATABLE_READ) {

		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    HA_ERR_UNSUPPORTED,
				    "InnoDB: WITH CONSISTENT SNAPSHOT "
				    "was ignored because this phrase "
				    "can only be used with "
				    "REPEATABLE READ isolation level.");
	} else {

		lock_mutex_enter();
		trx_sys_mutex_enter();
		trx_mutex_enter(from_trx);

		if (!trx_clone_read_view(trx, from_trx)) {

			push_warning_printf(thd, Sql_condition::SL_WARNING,
					    HA_ERR_UNSUPPORTED,
					    "InnoDB: WITH CONSISTENT SNAPSHOT "
					    "FROM SESSION was ignored because "
					    "the target transaction has not been "
					    "assigned a read view.");
		}

		lock_mutex_exit();
	}

	/* Set the MySQL flag to mark that there is an active transaction */

	innobase_register_trx(hton, current_thd, trx);

	DBUG_RETURN(0);
}

/*****************************************************************//**
Commits a transaction in an InnoDB database or marks an SQL statement
ended.
@return 0 or deadlock error if the transaction was aborted by another
	higher priority transaction. */
static
int
innobase_commit(
/*============*/
	handlerton*	hton,		/*!< in: InnoDB handlerton */
	THD*		thd,		/*!< in: MySQL thread handle of the
					user for whom the transaction should
					be committed */
	bool		commit_trx)	/*!< in: true - commit transaction
					false - the current SQL statement
					ended */
{
	DBUG_ENTER("innobase_commit");
	DBUG_ASSERT(hton == innodb_hton_ptr);
	DBUG_PRINT("trans", ("ending transaction"));

	trx_t*	trx = check_trx_exists(thd);

	TrxInInnoDB	trx_in_innodb(trx);

	if (trx_in_innodb.is_aborted()) {

		DBUG_RETURN(innobase_rollback(hton, thd, commit_trx));
	}

	ut_ad(trx->dict_operation_lock_mode == 0);
	ut_ad(trx->dict_operation == TRX_DICT_OP_NONE);

	/* Transaction is deregistered only in a commit or a rollback. If
	it is deregistered we know there cannot be resources to be freed
	and we could return immediately.  For the time being, we play safe
	and do the cleanup though there should be nothing to clean up. */

	if (!trx_is_registered_for_2pc(trx) && trx_is_started(trx)) {

		sql_print_error("Transaction not registered for MySQL 2PC,"
				" but transaction is active");
	}

	bool	read_only = trx->read_only || trx->id == 0;

	if (commit_trx
	    || (!thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {

		DBUG_EXECUTE_IF("crash_innodb_before_commit",
				DBUG_SUICIDE(););

		/* We were instructed to commit the whole transaction, or
		this is an SQL statement end and autocommit is on */

		/* We need current binlog position for mysqlbackup to work. */

		if (!read_only) {

			while (innobase_commit_concurrency > 0) {

				mysql_mutex_lock(&commit_cond_m);

				++commit_threads;

				if (commit_threads
				    <= innobase_commit_concurrency) {

					mysql_mutex_unlock(&commit_cond_m);
					break;
				}

				--commit_threads;

				mysql_cond_wait(&commit_cond, &commit_cond_m);

				mysql_mutex_unlock(&commit_cond_m);
			}

			/* The following call reads the binary log position of
			the transaction being committed.

			Binary logging of other engines is not relevant to
			InnoDB as all InnoDB requires is that committing
			InnoDB transactions appear in the same order in the
			MySQL binary log as they appear in InnoDB logs, which
			is guaranteed by the server.

			If the binary log is not enabled, or the transaction
			is not written to the binary log, the file name will
			be a NULL pointer. */
			ulonglong	pos;

			thd_binlog_pos(thd, &trx->mysql_log_file_name, &pos);

			trx->mysql_log_offset = static_cast<int64_t>(pos);

			/* Don't do write + flush right now. For group commit
			to work we want to do the flush later. */
			trx->flush_log_later = true;
		}

		innobase_commit_low(trx);

		if (!read_only) {
			trx->flush_log_later = false;

			if (innobase_commit_concurrency > 0) {

				mysql_mutex_lock(&commit_cond_m);

				ut_ad(commit_threads > 0);
				--commit_threads;

				mysql_cond_signal(&commit_cond);

				mysql_mutex_unlock(&commit_cond_m);
			}
		}

		trx_deregister_from_2pc(trx);

		/* Now do a write + flush of logs. */
		if (!read_only) {
			trx_commit_complete_for_mysql(trx);
		}

	} else {
		/* We just mark the SQL statement ended and do not do a
		transaction commit */

		/* If we had reserved the auto-inc lock for some
		table in this SQL statement we release it now */

		if (!read_only) {
			lock_unlock_table_autoinc(trx);
		}

		/* Store the current undo_no of the transaction so that we
		know where to roll back if we have to roll back the next
		SQL statement */

		trx_mark_sql_stat_end(trx);
	}

	/* Reset the number AUTO-INC rows required */
	trx->n_autoinc_rows = 0;

	/* This is a statement level variable. */
	trx->fts_next_doc_id = 0;

	innobase_srv_conc_force_exit_innodb(trx);

	DBUG_RETURN(0);
}

/*****************************************************************//**
Rolls back a transaction or the latest SQL statement.
@return 0 or error number */
static
int
innobase_rollback(
/*==============*/
	handlerton*	hton,		/*!< in: InnoDB handlerton */
	THD*		thd,		/*!< in: handle to the MySQL thread
					of the user whose transaction should
					be rolled back */
	bool		rollback_trx)	/*!< in: TRUE - rollback entire
					transaction FALSE - rollback the current
					statement only */
{
	DBUG_ENTER("innobase_rollback");
	DBUG_ASSERT(hton == innodb_hton_ptr);
	DBUG_PRINT("trans", ("aborting transaction"));

	trx_t*	trx = check_trx_exists(thd);

	TrxInInnoDB	trx_in_innodb(trx);

	ut_ad(trx_in_innodb.is_aborted()
	      || (trx->dict_operation_lock_mode == 0
		  && trx->dict_operation == TRX_DICT_OP_NONE));

	innobase_srv_conc_force_exit_innodb(trx);

	/* Reset the number AUTO-INC rows required */

	trx->n_autoinc_rows = 0;

	/* If we had reserved the auto-inc lock for some table (if
	we come here to roll back the latest SQL statement) we
	release it now before a possibly lengthy rollback */

	if (!trx_in_innodb.is_aborted()) {
		lock_unlock_table_autoinc(trx);
	}

	/* This is a statement level variable. */

	trx->fts_next_doc_id = 0;

	dberr_t		error;

	if (rollback_trx
	    || !thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

		error = trx_rollback_for_mysql(trx);

		if (trx->state == TRX_STATE_FORCED_ROLLBACK) {

			char	buffer[1024];

			ib::info() << "Forced rollback : "
				<< thd_security_context(thd, buffer,
							sizeof(buffer), 512);

			error = DB_FORCED_ABORT;

			trx->state = TRX_STATE_NOT_STARTED;
		}

		trx_deregister_from_2pc(trx);

	} else if (trx_in_innodb.is_aborted()) {

		error = DB_FORCED_ABORT;

	} else {

		error = trx_rollback_last_sql_stat_for_mysql(trx);
	}

	DBUG_RETURN(convert_error_code_to_mysql(error, 0, trx->mysql_thd));
}

/*****************************************************************//**
Rolls back a transaction
@return 0 or error number */
static
int
innobase_rollback_trx(
/*==================*/
	trx_t*	trx)	/*!< in: transaction */
{
	dberr_t	error = DB_SUCCESS;

	DBUG_ENTER("innobase_rollback_trx");
	DBUG_PRINT("trans", ("aborting transaction"));

	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the trx_sys->mutex, we have to release the search system
	latch first to obey the latching order. */

	trx_search_latch_release_if_reserved(trx);

	innobase_srv_conc_force_exit_innodb(trx);

	/* If we had reserved the auto-inc lock for some table (if
	we come here to roll back the latest SQL statement) we
	release it now before a possibly lengthy rollback */
	if (!TrxInInnoDB::is_aborted(trx)) {
		lock_unlock_table_autoinc(trx);
	}

	if (trx_is_rseg_updated(trx)) {
		error = trx_rollback_for_mysql(trx);
	} else {
		trx->will_lock = 0;
	}

	DBUG_RETURN(convert_error_code_to_mysql(error, 0, trx->mysql_thd));
}

/*****************************************************************//**
Rolls back a transaction to a savepoint.
@return 0 if success, HA_ERR_NO_SAVEPOINT if no savepoint with the
given name */
static
int
innobase_rollback_to_savepoint(
/*===========================*/
	handlerton*	hton,		/*!< in: InnoDB handlerton */
	THD*		thd,		/*!< in: handle to the MySQL thread
					of the user whose transaction should
					be rolled back to savepoint */
	void*		savepoint)	/*!< in: savepoint data */
{

	DBUG_ENTER("innobase_rollback_to_savepoint");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	trx_t*	trx = check_trx_exists(thd);

	TrxInInnoDB	trx_in_innodb(trx);

	innobase_srv_conc_force_exit_innodb(trx);

	/* TODO: use provided savepoint data area to store savepoint data */

	char	name[64];

	longlong2str((ulint) savepoint, name, 36);

	int64_t	mysql_binlog_cache_pos;

	dberr_t	error = trx_rollback_to_savepoint_for_mysql(
		trx, name, &mysql_binlog_cache_pos);

	if (error == DB_SUCCESS && trx->fts_trx != NULL) {
		fts_savepoint_rollback(trx, name);
	}

	DBUG_RETURN(convert_error_code_to_mysql(error, 0, NULL));
}

/*****************************************************************//**
Check whether innodb state allows to safely release MDL locks after
rollback to savepoint.
When binlog is on, MDL locks acquired after savepoint unit are not
released if there are any locks held in InnoDB.
@return true if it is safe, false if its not safe. */
static
bool
innobase_rollback_to_savepoint_can_release_mdl(
/*===========================================*/
	handlerton*	hton,		/*!< in: InnoDB handlerton */
	THD*		thd)		/*!< in: handle to the MySQL thread
					of the user whose transaction should
					be rolled back to savepoint */
{
	DBUG_ENTER("innobase_rollback_to_savepoint_can_release_mdl");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	trx_t*	trx = check_trx_exists(thd);

	TrxInInnoDB	trx_in_innodb(trx);

        /* If transaction has not acquired any locks then it is safe
	to release MDL after rollback to savepoint */
	if (UT_LIST_GET_LEN(trx->lock.trx_locks) == 0) {

		DBUG_RETURN(true);
	}

	DBUG_RETURN(false);
}

/*****************************************************************//**
Release transaction savepoint name.
@return 0 if success, HA_ERR_NO_SAVEPOINT if no savepoint with the
given name */
static
int
innobase_release_savepoint(
/*=======================*/
	handlerton*	hton,		/*!< in: handlerton for InnoDB */
	THD*		thd,		/*!< in: handle to the MySQL thread
					of the user whose transaction's
					savepoint should be released */
	void*		savepoint)	/*!< in: savepoint data */
{
	dberr_t		error;
	trx_t*		trx;
	char		name[64];

	DBUG_ENTER("innobase_release_savepoint");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	trx = check_trx_exists(thd);

	TrxInInnoDB	trx_in_innodb(trx);

	/* TODO: use provided savepoint data area to store savepoint data */

	longlong2str((ulint) savepoint, name, 36);

	error = trx_release_savepoint_for_mysql(trx, name);

	if (error == DB_SUCCESS && trx->fts_trx != NULL) {
		fts_savepoint_release(trx, name);
	}

	DBUG_RETURN(convert_error_code_to_mysql(error, 0, NULL));
}

/*****************************************************************//**
Sets a transaction savepoint.
@return always 0, that is, always succeeds */
static
int
innobase_savepoint(
/*===============*/
	handlerton*	hton,	/*!< in: handle to the InnoDB handlerton */
	THD*		thd,	/*!< in: handle to the MySQL thread */
	void*		savepoint)/*!< in: savepoint data */
{
	DBUG_ENTER("innobase_savepoint");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	/* In the autocommit mode there is no sense to set a savepoint
	(unless we are in sub-statement), so SQL layer ensures that
	this method is never called in such situation.  */

	trx_t*	trx = check_trx_exists(thd);

	TrxInInnoDB	trx_in_innodb(trx);

	innobase_srv_conc_force_exit_innodb(trx);

	/* Cannot happen outside of transaction */
	DBUG_ASSERT(trx_is_registered_for_2pc(trx));

	/* TODO: use provided savepoint data area to store savepoint data */
	char	name[64];

	longlong2str((ulint) savepoint,name,36);

	dberr_t	error = trx_savepoint_for_mysql(trx, name, 0);

	if (error == DB_SUCCESS && trx->fts_trx != NULL) {
		fts_savepoint_take(trx, trx->fts_trx, name);
	}

	DBUG_RETURN(convert_error_code_to_mysql(error, 0, NULL));
}

/*****************************************************************//**
Frees a possible InnoDB trx object associated with the current THD.
@return 0 or error number */
static
int
innobase_close_connection(
/*======================*/
	handlerton*	hton,	/*!< in: innobase handlerton */
	THD*		thd)	/*!< in: handle to the MySQL thread of the user
				whose resources should be free'd */
{

	DBUG_ENTER("innobase_close_connection");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	trx_t*	trx = thd_to_trx(thd);
	bool	free_trx = false;

	/* During server initialization MySQL layer will try to open
	some of the master-slave tables those residing in InnoDB.
	After MySQL layer is done with needed checks these tables
	are closed followed by invocation of close_connection on the
	associated thd.

	close_connection rolls back the trx and then frees it.
	Once trx is freed thd should avoid maintaining reference to
	it else it can be classified as stale reference.

	Re-invocation of innodb_close_connection on same thd should
	get trx as NULL. */

	if (trx != NULL) {

		TrxInInnoDB	trx_in_innodb(trx);

		if (trx_in_innodb.is_aborted()) {

			while (trx_is_started(trx)) {

				os_thread_sleep(20);
			}
		}

		if (!trx_is_registered_for_2pc(trx) && trx_is_started(trx)) {

			sql_print_error("Transaction not registered for MySQL"
					" 2PC, but transaction is active");
		}

		/* Disconnect causes rollback in the following cases:
		- trx is not started, or
		- trx is in *not* in PREPARED state, or
		- trx has not updated any persistent data.
		TODO/FIXME: it does not make sense to initiate rollback
		in the 1st and 3rd case. */
		if (trx_is_started(trx)) {
			if (trx_state_eq(trx, TRX_STATE_PREPARED)) {
				if (trx_is_redo_rseg_updated(trx)) {
					trx_disconnect_prepared(trx);
				} else {
					trx_rollback_for_mysql(trx);
					trx_deregister_from_2pc(trx);
					free_trx = true;
				}
			} else {
				sql_print_warning(
					"MySQL is closing a connection that "
					"has an active InnoDB transaction.  "
					TRX_ID_FMT
					" row modifications will roll back.",
					trx->undo_no);
				ut_d(ib::warn()
				     << "trx: " << trx << " started on: "
				     << innobase_basename(trx->start_file)
				     << ":" << trx->start_line);
				innobase_rollback_trx(trx);
				free_trx = true;
			}
		} else {
			innobase_rollback_trx(trx);
			free_trx = true;
		}
	}

	/* Free trx only after TrxInInnoDB is deleted. */
	if (free_trx) {
		trx_free_for_mysql(trx);
	}

	UT_DELETE(thd_to_innodb_session(thd));

	thd_to_innodb_session(thd) = NULL;

	DBUG_RETURN(0);
}

/*****************************************************************//**
Cancel any pending lock request associated with the current THD. */
static
void
innobase_kill_connection(
/*======================*/
	handlerton*    hton,   /*!< in:  innobase handlerton */
	THD*		thd)    /*!< in: handle to the MySQL thread being
				killed */
{
	DBUG_ENTER("innobase_kill_connection");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	trx_t*	trx = thd_to_trx(thd);

	if (trx != NULL) {

		/* Cancel a pending lock request if there are any */
		lock_trx_handle_wait(trx);
	}

	DBUG_VOID_RETURN;
}

/*************************************************************************//**
** InnoDB database tables
*****************************************************************************/

/** Get the record format from the data dictionary.
@return one of ROW_TYPE_REDUNDANT, ROW_TYPE_COMPACT,
ROW_TYPE_COMPRESSED, ROW_TYPE_DYNAMIC */

enum row_type
ha_innobase::get_row_type() const
{
	if (m_prebuilt && m_prebuilt->table) {
		const ulint	flags = m_prebuilt->table->flags;

		switch (dict_tf_get_rec_format(flags)) {
		case REC_FORMAT_REDUNDANT:
			return(ROW_TYPE_REDUNDANT);
		case REC_FORMAT_COMPACT:
			return(ROW_TYPE_COMPACT);
		case REC_FORMAT_COMPRESSED:
			return(ROW_TYPE_COMPRESSED);
		case REC_FORMAT_DYNAMIC:
			return(ROW_TYPE_DYNAMIC);
		}
	}
	ut_ad(0);
	return(ROW_TYPE_NOT_USED);
}

/****************************************************************//**
Get the table flags to use for the statement.
@return table flags */

handler::Table_flags
ha_innobase::table_flags() const
/*============================*/
{
	THD*			thd = ha_thd();
	handler::Table_flags	flags = m_int_table_flags;

	/* If querying the table flags when no table_share is given,
	then we must check if the table to be created/checked is partitioned.
	*/
	if (table_share == NULL && thd_get_work_part_info(thd) != NULL) {
		/* Currently ha_innopart does not support
		all InnoDB features such as GEOMETRY, FULLTEXT etc. */
		flags &= ~(HA_INNOPART_DISABLED_TABLE_FLAGS);
	}

	/* Need to use tx_isolation here since table flags is (also)
	called before prebuilt is inited. */

	ulong const	tx_isolation = thd_tx_isolation(thd);

	if (tx_isolation <= ISO_READ_COMMITTED) {
		return(flags);
	}

	return(flags | HA_BINLOG_STMT_CAPABLE);
}

/****************************************************************//**
Gives the file extension of an InnoDB single-table tablespace. */
static const char* ha_innobase_exts[] = {
	dot_ext[IBD],
	dot_ext[ISL],
	NullS
};

/****************************************************************//**
Returns the table type (storage engine name).
@return table type */

const char*
ha_innobase::table_type() const
/*===========================*/
{
	return(innobase_hton_name);
}

/****************************************************************//**
Returns the index type.
@return index type */

const char*
ha_innobase::index_type(
/*====================*/
	uint	keynr)		/*!< : index number */
{
	dict_index_t*	index = innobase_get_index(keynr);

	if (index && index->type & DICT_FTS) {
		return("FULLTEXT");
	} else if (dict_index_is_spatial(index)) {
		return("SPATIAL");
	} else {
		return("BTREE");
	}
}

/****************************************************************//**
Returns the table file name extension.
@return file extension string */

const char**
ha_innobase::bas_ext() const
/*========================*/
{
	return(ha_innobase_exts);
}

/****************************************************************//**
Returns the operations supported for indexes.
@return flags of supported operations */

ulong
ha_innobase::index_flags(
/*=====================*/
	uint	key,
	uint,
	bool) const
{
	if (table_share->key_info[key].algorithm == HA_KEY_ALG_FULLTEXT) {
		return(0);
	}

	ulong flags = HA_READ_NEXT | HA_READ_PREV | HA_READ_ORDER
		      | HA_READ_RANGE | HA_KEYREAD_ONLY
		      | HA_DO_INDEX_COND_PUSHDOWN;

	/* For spatial index, we don't support descending scan
	and ICP so far. */
	if (table_share->key_info[key].flags & HA_SPATIAL) {
		flags = HA_READ_NEXT | HA_READ_ORDER| HA_READ_RANGE
			| HA_KEYREAD_ONLY | HA_KEY_SCAN_NOT_ROR;
	}

	return(flags);
}

/****************************************************************//**
Returns the maximum number of keys.
@return MAX_KEY */

uint
ha_innobase::max_supported_keys() const
/*===================================*/
{
	return(MAX_KEY);
}

/****************************************************************//**
Returns the maximum key length.
@return maximum supported key length, in bytes */

uint
ha_innobase::max_supported_key_length() const
/*=========================================*/
{
	/* An InnoDB page must store >= 2 keys; a secondary key record
	must also contain the primary key value.  Therefore, if both
	the primary key and the secondary key are at this maximum length,
	it must be less than 1/4th of the free space on a page including
	record overhead.

	MySQL imposes its own limit to this number; MAX_KEY_LENGTH = 3072.

	For page sizes = 16k, InnoDB historically reported 3500 bytes here,
	But the MySQL limit of 3072 was always used through the handler
	interface. */

	switch (UNIV_PAGE_SIZE) {
	case 4096:
		return(768);
	case 8192:
		return(1536);
	default:
		return(3500);
	}
}

/****************************************************************//**
Returns the key map of keys that are usable for scanning.
@return key_map_full */

const key_map*
ha_innobase::keys_to_use_for_scanning()
/*===================================*/
{
	return(&key_map_full);
}

/****************************************************************//**
Determines if table caching is supported.
@return HA_CACHE_TBL_ASKTRANSACT */

uint8
ha_innobase::table_cache_type()
/*===========================*/
{
	return(HA_CACHE_TBL_ASKTRANSACT);
}

/****************************************************************//**
Determines if the primary key is clustered index.
@return true */

bool
ha_innobase::primary_key_is_clustered() const
/*=========================================*/
{
	return(true);
}

/** Normalizes a table name string.
A normalized name consists of the database name catenated to '/'
and table name. For example: test/mytable.
On Windows, normalization puts both the database name and the
table name always to lower case if "set_lower_case" is set to TRUE.
@param[out]	norm_name	Normalized name, null-terminated.
@param[in]	name		Name to normalize.
@param[in]	set_lower_case	True if we also should fold to lower case. */
void
create_table_info_t::normalize_table_name_low(
	char*		norm_name,
	const char*	name,
	ibool		set_lower_case)
{
	char*	name_ptr;
	ulint	name_len;
	char*	db_ptr;
	ulint	db_len;
	char*	ptr;
	ulint	norm_len;

	/* Scan name from the end */

	ptr = strend(name) - 1;

	/* seek to the last path separator */
	while (ptr >= name && *ptr != '\\' && *ptr != '/') {
		ptr--;
	}

	name_ptr = ptr + 1;
	name_len = strlen(name_ptr);

	/* skip any number of path separators */
	while (ptr >= name && (*ptr == '\\' || *ptr == '/')) {
		ptr--;
	}

	DBUG_ASSERT(ptr >= name);

	/* seek to the last but one path separator or one char before
	the beginning of name */
	db_len = 0;
	while (ptr >= name && *ptr != '\\' && *ptr != '/') {
		ptr--;
		db_len++;
	}

	db_ptr = ptr + 1;

	norm_len = db_len + name_len + sizeof "/";
	ut_a(norm_len < FN_REFLEN - 1);

	memcpy(norm_name, db_ptr, db_len);

	norm_name[db_len] = '/';

	/* Copy the name and null-byte. */
	memcpy(norm_name + db_len + 1, name_ptr, name_len + 1);

	if (set_lower_case) {
		innobase_casedn_str(norm_name);
	}
}

#if !defined(DBUG_OFF)
/*********************************************************************
Test normalize_table_name_low(). */
static
void
test_normalize_table_name_low()
/*===========================*/
{
	char		norm_name[FN_REFLEN];
	const char*	test_data[][2] = {
		/* input, expected result */
		{"./mysqltest/t1", "mysqltest/t1"},
		{"./test/#sql-842b_2", "test/#sql-842b_2"},
		{"./test/#sql-85a3_10", "test/#sql-85a3_10"},
		{"./test/#sql2-842b-2", "test/#sql2-842b-2"},
		{"./test/bug29807", "test/bug29807"},
		{"./test/foo", "test/foo"},
		{"./test/innodb_bug52663", "test/innodb_bug52663"},
		{"./test/t", "test/t"},
		{"./test/t1", "test/t1"},
		{"./test/t10", "test/t10"},
		{"/a/b/db/table", "db/table"},
		{"/a/b/db///////table", "db/table"},
		{"/a/b////db///////table", "db/table"},
		{"/var/tmp/mysqld.1/#sql842b_2_10", "mysqld.1/#sql842b_2_10"},
		{"db/table", "db/table"},
		{"ddd/t", "ddd/t"},
		{"d/ttt", "d/ttt"},
		{"d/t", "d/t"},
		{".\\mysqltest\\t1", "mysqltest/t1"},
		{".\\test\\#sql-842b_2", "test/#sql-842b_2"},
		{".\\test\\#sql-85a3_10", "test/#sql-85a3_10"},
		{".\\test\\#sql2-842b-2", "test/#sql2-842b-2"},
		{".\\test\\bug29807", "test/bug29807"},
		{".\\test\\foo", "test/foo"},
		{".\\test\\innodb_bug52663", "test/innodb_bug52663"},
		{".\\test\\t", "test/t"},
		{".\\test\\t1", "test/t1"},
		{".\\test\\t10", "test/t10"},
		{"C:\\a\\b\\db\\table", "db/table"},
		{"C:\\a\\b\\db\\\\\\\\\\\\\\table", "db/table"},
		{"C:\\a\\b\\\\\\\\db\\\\\\\\\\\\\\table", "db/table"},
		{"C:\\var\\tmp\\mysqld.1\\#sql842b_2_10", "mysqld.1/#sql842b_2_10"},
		{"db\\table", "db/table"},
		{"ddd\\t", "ddd/t"},
		{"d\\ttt", "d/ttt"},
		{"d\\t", "d/t"},
	};

	for (size_t i = 0; i < UT_ARR_SIZE(test_data); i++) {
		printf("test_normalize_table_name_low():"
		       " testing \"%s\", expected \"%s\"... ",
		       test_data[i][0], test_data[i][1]);

		create_table_info_t::normalize_table_name_low(
			norm_name, test_data[i][0], FALSE);

		if (strcmp(norm_name, test_data[i][1]) == 0) {
			printf("ok\n");
		} else {
			printf("got \"%s\"\n", norm_name);
			ut_error;
		}
	}
}

/*********************************************************************
Test ut_format_name(). */
static
void
test_ut_format_name()
/*=================*/
{
	char		buf[NAME_LEN * 3];

	struct {
		const char*	name;
		ulint		buf_size;
		const char*	expected;
	} test_data[] = {
		{"test/t1",	sizeof(buf),	"`test`.`t1`"},
		{"test/t1",	12,		"`test`.`t1`"},
		{"test/t1",	11,		"`test`.`t1"},
		{"test/t1",	10,		"`test`.`t"},
		{"test/t1",	9,		"`test`.`"},
		{"test/t1",	8,		"`test`."},
		{"test/t1",	7,		"`test`"},
		{"test/t1",	6,		"`test"},
		{"test/t1",	5,		"`tes"},
		{"test/t1",	4,		"`te"},
		{"test/t1",	3,		"`t"},
		{"test/t1",	2,		"`"},
		{"test/t1",	1,		""},
		{"test/t1",	0,		"BUF_NOT_CHANGED"},
		{"table",	sizeof(buf),	"`table`"},
		{"ta'le",	sizeof(buf),	"`ta'le`"},
		{"ta\"le",	sizeof(buf),	"`ta\"le`"},
		{"ta`le",	sizeof(buf),	"`ta``le`"},
	};

	for (size_t i = 0; i < UT_ARR_SIZE(test_data); i++) {

		memcpy(buf, "BUF_NOT_CHANGED", strlen("BUF_NOT_CHANGED") + 1);

		char*	ret;

		ret = ut_format_name(test_data[i].name,
				     buf,
				     test_data[i].buf_size);

		ut_a(ret == buf);

		if (strcmp(buf, test_data[i].expected) == 0) {
			ib::info() << "ut_format_name(" << test_data[i].name
				<< ", buf, " << test_data[i].buf_size << "),"
				" expected " << test_data[i].expected
				<< ", OK";
		} else {
			ib::error() << "ut_format_name(" << test_data[i].name
				<< ", buf, " << test_data[i].buf_size << "),"
				" expected " << test_data[i].expected
				<< ", ERROR: got " << buf;
			ut_error;
		}
	}
}
#endif /* !DBUG_OFF */

/** Match index columns between MySQL and InnoDB.
This function checks whether the index column information
is consistent between KEY info from mysql and that from innodb index.
@param[in]	key_info	Index info from mysql
@param[in]	index_info	Index info from InnoDB
@return true if all column types match. */
bool
innobase_match_index_columns(
	const KEY*		key_info,
	const dict_index_t*	index_info)
{
	const KEY_PART_INFO*	key_part;
	const KEY_PART_INFO*	key_end;
	const dict_field_t*	innodb_idx_fld;
	const dict_field_t*	innodb_idx_fld_end;

	DBUG_ENTER("innobase_match_index_columns");

	/* Check whether user defined index column count matches */
	if (key_info->user_defined_key_parts !=
		index_info->n_user_defined_cols) {
		DBUG_RETURN(FALSE);
	}

	key_part = key_info->key_part;
	key_end = key_part + key_info->user_defined_key_parts;
	innodb_idx_fld = index_info->fields;
	innodb_idx_fld_end = index_info->fields + index_info->n_fields;

	/* Check each index column's datatype. We do not check
	column name because there exists case that index
	column name got modified in mysql but such change does not
	propagate to InnoDB.
	One hidden assumption here is that the index column sequences
	are matched up between those in mysql and InnoDB. */
	for (; key_part != key_end; ++key_part) {
		ulint	col_type;
		ibool	is_unsigned;
		ulint	mtype = innodb_idx_fld->col->mtype;

		/* Need to translate to InnoDB column type before
		comparison. */
		col_type = get_innobase_type_from_mysql_type(
			&is_unsigned, key_part->field);

		/* Ignore InnoDB specific system columns. */
		while (mtype == DATA_SYS) {
			innodb_idx_fld++;

			if (innodb_idx_fld >= innodb_idx_fld_end) {
				DBUG_RETURN(FALSE);
			}
		}

		if (col_type != mtype) {
			/* If the col_type we get from mysql type is a geometry
			data type, we should check if mtype is a legacy type
			from 5.6, either upgraded to DATA_GEOMETRY or not.
			This is indeed not an accurate check, but should be
			safe, since DATA_BLOB would be upgraded once we create
			spatial index on it and we intend to use DATA_GEOMETRY
			for legacy GIS data types which are of var-length. */
			switch (col_type) {
			case DATA_POINT:
			case DATA_VAR_POINT:
				if (DATA_POINT_MTYPE(mtype)
				    || mtype == DATA_GEOMETRY
				    || mtype == DATA_BLOB) {
					break;
				}
				/* Fall through */
			case DATA_GEOMETRY:
				if (mtype == DATA_BLOB) {
					break;
				}
				/* Fall through */
			default:
				/* Column type mismatches */
				DBUG_RETURN(false);
			}
		}

		innodb_idx_fld++;
	}

	DBUG_RETURN(TRUE);
}

/** Build a template for a base column for a virtual column
@param[in]	table		MySQL TABLE
@param[in]	clust_index	InnoDB clustered index
@param[in]	field		field in MySQL table
@param[in]	col		InnoDB column
@param[in,out]	templ		template to fill
@param[in]	col_no		field index for virtual col
*/
static
void
innobase_vcol_build_templ(
	const TABLE*		table,
	dict_index_t*		clust_index,
	Field*			field,
	const dict_col_t*	col,
	mysql_row_templ_t*	templ,
	ulint			col_no)
{
	if (dict_col_is_virtual(col)) {
		templ->is_virtual = true;
		templ->col_no = col_no;
		templ->clust_rec_field_no = ULINT_UNDEFINED;
		templ->rec_field_no = col->ind;
	} else {
		templ->is_virtual = false;
		templ->col_no = col_no;
		templ->clust_rec_field_no = dict_col_get_clust_pos(
						col, clust_index);
		ut_a(templ->clust_rec_field_no != ULINT_UNDEFINED);

		templ->rec_field_no = templ->clust_rec_field_no;
	}

	if (field->real_maybe_null()) {
                templ->mysql_null_byte_offset =
                        field->null_offset();

                templ->mysql_null_bit_mask = (ulint) field->null_bit;
        } else {
                templ->mysql_null_bit_mask = 0;
        }

        templ->mysql_col_offset = static_cast<ulint>(
					get_field_offset(table, field));
	templ->mysql_col_len = static_cast<ulint>(field->pack_length());
        templ->type = col->mtype;
        templ->mysql_type = static_cast<ulint>(field->type());

	if (templ->mysql_type == DATA_MYSQL_TRUE_VARCHAR) {
		templ->mysql_length_bytes = static_cast<ulint>(
			((Field_varstring*) field)->length_bytes);
	}

        templ->charset = dtype_get_charset_coll(col->prtype);
        templ->mbminlen = dict_col_get_mbminlen(col);
        templ->mbmaxlen = dict_col_get_mbmaxlen(col);
        templ->is_unsigned = col->prtype & DATA_UNSIGNED;
}

/** callback used by MySQL server layer to initialize
the table virtual columns' template
@param[in]	table		MySQL TABLE
@param[in,out]	ib_table	InnoDB table */
void
innobase_build_v_templ_callback(
	const TABLE*	table,
	void*		ib_table)
{
	const dict_table_t* t_table = static_cast<dict_table_t*>(ib_table);

	innobase_build_v_templ(table, t_table, t_table->vc_templ, NULL,
			       true, NULL);
}

/** Build template for the virtual columns and their base columns. This
is done when the table first opened.
@param[in]	table		MySQL TABLE
@param[in]	ib_table	InnoDB dict_table_t
@param[in,out]	s_templ		InnoDB template structure
@param[in]	add_v		new virtual columns added along with
				add index call
@param[in]	locked		true if dict_sys mutex is held
@param[in]	share_tbl_name	original MySQL table name */
void
innobase_build_v_templ(
	const TABLE*		table,
	const dict_table_t*	ib_table,
	dict_vcol_templ_t*	s_templ,
	const dict_add_v_col_t*	add_v,
	bool			locked,
	const char*		share_tbl_name)
{
	ulint	ncol = ib_table->n_cols - DATA_N_SYS_COLS;
	ulint	n_v_col = ib_table->n_v_cols;
	bool	marker[REC_MAX_N_FIELDS];

	ut_ad(ncol < REC_MAX_N_FIELDS);

	if (add_v != NULL) {
		n_v_col += add_v->n_v_col;
	}

	ut_ad(n_v_col > 0);

	if (!locked) {
		mutex_enter(&dict_sys->mutex);
	}

	if (s_templ->vtempl) {
		if (!locked) {
			mutex_exit(&dict_sys->mutex);
		}
		return;
	}

	memset(marker, 0, sizeof(bool) * ncol);

	s_templ->vtempl = static_cast<mysql_row_templ_t**>(
		ut_zalloc_nokey((ncol + n_v_col)
				* sizeof *s_templ->vtempl));
	s_templ->n_col = ncol;
	s_templ->n_v_col = n_v_col;
	s_templ->rec_len = table->s->reclength;
	s_templ->default_rec = table->s->default_values;

	/* Mark those columns could be base columns */
	for (ulint i = 0; i < ib_table->n_v_cols; i++) {
		const dict_v_col_t*	vcol = dict_table_get_nth_v_col(
							ib_table, i);

		for (ulint j = 0; j < vcol->num_base; j++) {
			ulint	col_no = vcol->base_col[j]->ind;
			marker[col_no] = true;
		}
	}

	if (add_v) {
		for (ulint i = 0; i < add_v->n_v_col; i++) {
			const dict_v_col_t*	vcol = &add_v->v_col[i];

			for (ulint j = 0; j < vcol->num_base; j++) {
				ulint	col_no = vcol->base_col[j]->ind;
				marker[col_no] = true;
			}
		}
	}

	ulint	j = 0;
	ulint	z = 0;

	dict_index_t*	clust_index = dict_table_get_first_index(ib_table);

	for (ulint i = 0; i < table->s->fields; i++) {
		Field*  field = table->field[i];

		/* Build template for virtual columns */
		if (innobase_is_v_fld(field)) {
#ifdef UNIV_DEBUG
			const char*	name;

			if (z >= ib_table->n_v_def) {
				name = add_v->v_col_name[z - ib_table->n_v_def];
			} else {
				name = dict_table_get_v_col_name(ib_table, z);
			}

			ut_ad(!ut_strcmp(name, field->field_name));
#endif
			const dict_v_col_t*	vcol;

			if (z >= ib_table->n_v_def) {
				vcol = &add_v->v_col[z - ib_table->n_v_def];
			} else {
				vcol = dict_table_get_nth_v_col(ib_table, z);
			}

			s_templ->vtempl[z + s_templ->n_col]
				= static_cast<mysql_row_templ_t*>(
					ut_malloc_nokey(
					sizeof *s_templ->vtempl[j]));

			innobase_vcol_build_templ(
				table, clust_index, field,
				&vcol->m_col,
				s_templ->vtempl[z + s_templ->n_col],
				z);
			z++;
			continue;
                }

		ut_ad(j < ncol);

		/* Build template for base columns */
		if (marker[j]) {
			dict_col_t*   col = dict_table_get_nth_col(
						ib_table, j);

#ifdef UNIV_DEBUG
			const char*	name = dict_table_get_col_name(
						ib_table, j);

			ut_ad(!ut_strcmp(name, field->field_name));
#endif

			s_templ->vtempl[j] = static_cast<
				mysql_row_templ_t*>(
					ut_malloc_nokey(
					sizeof *s_templ->vtempl[j]));

			innobase_vcol_build_templ(
				table, clust_index, field, col,
				s_templ->vtempl[j], j);
		}

		j++;
	}

	if (!locked) {
		mutex_exit(&dict_sys->mutex);
	}

	s_templ->db_name = table->s->db.str;
	s_templ->tb_name = table->s->table_name.str;

	if (share_tbl_name) {
		s_templ->share_name = share_tbl_name;
	}
}

/*******************************************************************//**
This function builds a translation table in INNOBASE_SHARE
structure for fast index location with mysql array number from its
table->key_info structure. This also provides the necessary translation
between the key order in mysql key_info and InnoDB ib_table->indexes if
they are not fully matched with each other.
Note we do not have any mutex protecting the translation table
building based on the assumption that there is no concurrent
index creation/drop and DMLs that requires index lookup. All table
handle will be closed before the index creation/drop.
@return true if index translation table built successfully */
bool
innobase_build_index_translation(
/*=============================*/
	const TABLE*		table,	/*!< in: table in MySQL data
					dictionary */
	dict_table_t*		ib_table,/*!< in: table in InnoDB data
					dictionary */
	INNOBASE_SHARE*		share)	/*!< in/out: share structure
					where index translation table
					will be constructed in. */
{
	DBUG_ENTER("innobase_build_index_translation");

	bool	ret = true;

	mutex_enter(&dict_sys->mutex);

	ulint	mysql_num_index = table->s->keys;
	ulint	ib_num_index = UT_LIST_GET_LEN(ib_table->indexes);
	dict_index_t**	index_mapping = share->idx_trans_tbl.index_mapping;

	/* If there exists inconsistency between MySQL and InnoDB dictionary
	(metadata) information, the number of index defined in MySQL
	could exceed that in InnoDB, do not build index translation
	table in such case */
	if (ib_num_index < mysql_num_index) {
		ret = false;
		goto func_exit;
	}

	/* If index entry count is non-zero, nothing has
	changed since last update, directly return TRUE */
	if (share->idx_trans_tbl.index_count) {
		/* Index entry count should still match mysql_num_index */
		ut_a(share->idx_trans_tbl.index_count == mysql_num_index);
		goto func_exit;
	}

	/* The number of index increased, rebuild the mapping table */
	if (mysql_num_index > share->idx_trans_tbl.array_size) {

		index_mapping = reinterpret_cast<dict_index_t**>(
			ut_realloc(index_mapping,
				   mysql_num_index * sizeof(*index_mapping)));

		if (index_mapping == NULL) {
			/* Report an error if index_mapping continues to be
			NULL and mysql_num_index is a non-zero value */
			sql_print_error("InnoDB: fail to allocate memory for"
					" index translation table. Number of"
					" Index:%lu, array size:%lu",
					mysql_num_index,
					share->idx_trans_tbl.array_size);
			ret = false;
			goto func_exit;
		}

		share->idx_trans_tbl.array_size = mysql_num_index;
	}

	/* For each index in the mysql key_info array, fetch its
	corresponding InnoDB index pointer into index_mapping
	array. */
	for (ulint count = 0; count < mysql_num_index; count++) {

		/* Fetch index pointers into index_mapping according to mysql
		index sequence */
		index_mapping[count] = dict_table_get_index_on_name(
			ib_table, table->key_info[count].name);

		if (index_mapping[count] == 0) {
			sql_print_error("Cannot find index %s in InnoDB"
					" index dictionary.",
					table->key_info[count].name);
			ret = false;
			goto func_exit;
		}

		/* Double check fetched index has the same
		column info as those in mysql key_info. */
		if (!innobase_match_index_columns(&table->key_info[count],
					          index_mapping[count])) {
			sql_print_error("Found index %s whose column info"
					" does not match that of MySQL.",
					table->key_info[count].name);
			ret = false;
			goto func_exit;
		}
	}

	/* Successfully built the translation table */
	share->idx_trans_tbl.index_count = mysql_num_index;

func_exit:
	if (!ret) {
		/* Build translation table failed. */
		ut_free(index_mapping);

		share->idx_trans_tbl.array_size = 0;
		share->idx_trans_tbl.index_count = 0;
		index_mapping = NULL;
	}

	share->idx_trans_tbl.index_mapping = index_mapping;

	mutex_exit(&dict_sys->mutex);

	DBUG_RETURN(ret);
}

/*******************************************************************//**
This function uses index translation table to quickly locate the
requested index structure.
Note we do not have mutex protection for the index translatoin table
access, it is based on the assumption that there is no concurrent
translation table rebuild (fter create/drop index) and DMLs that
require index lookup.
@return dict_index_t structure for requested index. NULL if
fail to locate the index structure. */
static
dict_index_t*
innobase_index_lookup(
/*==================*/
	INNOBASE_SHARE*	share,	/*!< in: share structure for index
				translation table. */
	uint		keynr)	/*!< in: index number for the requested
				index */
{
	if (share->idx_trans_tbl.index_mapping == NULL
	    || keynr >= share->idx_trans_tbl.index_count) {
		return(NULL);
	}

	return(share->idx_trans_tbl.index_mapping[keynr]);
}

/************************************************************************
Set the autoinc column max value. This should only be called once from
ha_innobase::open(). Therefore there's no need for a covering lock. */

void
ha_innobase::innobase_initialize_autoinc()
/*======================================*/
{
	ulonglong	auto_inc;
	const Field*	field = table->found_next_number_field;

	if (field != NULL) {
		auto_inc = field->get_max_int_value();

		/* autoinc column cannot be virtual column */
		ut_ad(!innobase_is_v_fld(field));
	} else {
		/* We have no idea what's been passed in to us as the
		autoinc column. We set it to the 0, effectively disabling
		updates to the table. */
		auto_inc = 0;

		ib::info() << "Unable to determine the AUTOINC column name";
	}

	if (srv_force_recovery >= SRV_FORCE_NO_IBUF_MERGE) {
		/* If the recovery level is set so high that writes
		are disabled we force the AUTOINC counter to 0
		value effectively disabling writes to the table.
		Secondly, we avoid reading the table in case the read
		results in failure due to a corrupted table/index.

		We will not return an error to the client, so that the
		tables can be dumped with minimal hassle.  If an error
		were returned in this case, the first attempt to read
		the table would fail and subsequent SELECTs would succeed. */
		auto_inc = 0;
	} else if (field == NULL) {
		/* This is a far more serious error, best to avoid
		opening the table and return failure. */
		my_error(ER_AUTOINC_READ_FAILED, MYF(0));
	} else {
		dict_index_t*	index;
		const char*	col_name;
		ib_uint64_t	read_auto_inc;
		ulint		err;

		update_thd(ha_thd());

		col_name = field->field_name;

		/* For intrinsic table, name of field has to be prefixed with
		table name to maintain column-name uniqueness. */
		if (m_prebuilt->table != NULL
		    && dict_table_is_intrinsic(m_prebuilt->table)) {

			ulint	col_no = dict_col_get_no(dict_table_get_nth_col(
				m_prebuilt->table, field->field_index));

			col_name = dict_table_get_col_name(
				m_prebuilt->table, col_no);
		}

		index = innobase_get_index(table->s->next_number_index);

		/* Execute SELECT MAX(col_name) FROM TABLE; */
		err = row_search_max_autoinc(index, col_name, &read_auto_inc);

		switch (err) {
		case DB_SUCCESS: {
			ulonglong	col_max_value;

			col_max_value = field->get_max_int_value();

			/* At the this stage we do not know the increment
			nor the offset, so use a default increment of 1. */

			auto_inc = innobase_next_autoinc(
				read_auto_inc, 1, 1, 0, col_max_value);

			break;
		}
		case DB_RECORD_NOT_FOUND:
			ib::error() << "MySQL and InnoDB data dictionaries are"
				" out of sync. Unable to find the AUTOINC"
				" column " << col_name << " in the InnoDB"
				" table " << index->table->name << ". We set"
				" the next AUTOINC column value to 0, in"
				" effect disabling the AUTOINC next value"
				" generation.";

			ib::info() << "You can either set the next AUTOINC"
				" value explicitly using ALTER TABLE or fix"
				" the data dictionary by recreating the"
				" table.";

			/* This will disable the AUTOINC generation. */
			auto_inc = 0;

			/* We want the open to succeed, so that the user can
			take corrective action. ie. reads should succeed but
			updates should fail. */
			err = DB_SUCCESS;
			break;
		default:
			/* row_search_max_autoinc() should only return
			one of DB_SUCCESS or DB_RECORD_NOT_FOUND. */
			ut_error;
		}
	}

	dict_table_autoinc_initialize(m_prebuilt->table, auto_inc);
}

/*****************************************************************//**
Creates and opens a handle to a table which already exists in an InnoDB
database.
@return 1 if error, 0 if success */

int
ha_innobase::open(
/*==============*/
	const char*		name,		/*!< in: table name */
	int			mode,		/*!< in: not used */
	uint			test_if_locked)	/*!< in: not used */
{
	dict_table_t*		ib_table;
	char			norm_name[FN_REFLEN];
	THD*			thd;
	char*			is_part = NULL;
	dict_err_ignore_t	ignore_err = DICT_ERR_IGNORE_NONE;

	DBUG_ENTER("ha_innobase::open");

	UT_NOT_USED(mode);
	UT_NOT_USED(test_if_locked);

	thd = ha_thd();

	/* Under some cases MySQL seems to call this function while
	holding search latch(es). This breaks the latching order as
	we acquire dict_sys->mutex below and leads to a deadlock. */
	if (thd != NULL) {
		innobase_release_temporary_latches(ht, thd);
	}

	normalize_table_name(norm_name, name);

	m_user_thd = NULL;

	if (!(m_share = get_share(name))) {

		DBUG_RETURN(1);
	}

	if (UNIV_UNLIKELY(m_share->ib_table && m_share->ib_table->is_corrupt &&
			  srv_pass_corrupt_table <= 1)) {
		free_share(m_share);

		DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);
	}

	/* Will be allocated if it is needed in ::update_row() */
	m_upd_buf = NULL;
	m_upd_buf_size = 0;

	/* We look for pattern #P# to see if the table is partitioned
	MySQL table. */
#ifdef _WIN32
	is_part = strstr(norm_name, "#p#");
#else
	is_part = strstr(norm_name, "#P#");
#endif /* _WIN32 */

	/* Check whether FOREIGN_KEY_CHECKS is set to 0. If so, the table
	can be opened even if some FK indexes are missing. If not, the table
	can't be opened in the same situation */
	if (thd_test_options(thd, OPTION_NO_FOREIGN_KEY_CHECKS)) {
		ignore_err = DICT_ERR_IGNORE_FK_NOKEY;
	}

	/* Get pointer to a table object in InnoDB dictionary cache.
	For intrinsic table, get it from session private data */
	ib_table = thd_to_innodb_session(thd)->lookup_table_handler(norm_name);

	if (ib_table == NULL) {

		ib_table = open_dict_table(name, norm_name, is_part,
					   ignore_err);
	} else {
		ib_table->acquire();
		ut_ad(dict_table_is_intrinsic(ib_table));
	}

	if (ib_table != NULL
	    && ((!DICT_TF2_FLAG_IS_SET(ib_table, DICT_TF2_FTS_HAS_DOC_ID)
		 && table->s->fields != dict_table_get_n_tot_u_cols(ib_table))
		|| (DICT_TF2_FLAG_IS_SET(ib_table, DICT_TF2_FTS_HAS_DOC_ID)
		    && (table->s->fields
			!= dict_table_get_n_tot_u_cols(ib_table) - 1)))) {

		ib::warn() << "Table " << norm_name << " contains "
			<< dict_table_get_n_user_cols(ib_table) << " user"
			" defined columns in InnoDB, but " << table->s->fields
			<< " columns in MySQL. Please check"
			" INFORMATION_SCHEMA.INNODB_SYS_COLUMNS and " REFMAN
			"innodb-troubleshooting.html for how to resolve the"
			" issue.";

		/* Mark this table as corrupted, so the drop table
		or force recovery can still use it, but not others. */
		ib_table->corrupted = true;
		dict_table_close(ib_table, FALSE, FALSE);
		ib_table = NULL;
		is_part = NULL;
	}

	if (UNIV_UNLIKELY(ib_table && ib_table->is_corrupt &&
			  srv_pass_corrupt_table <= 1)) {

		free_share(m_share);
		DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);
	}

	/* For encrypted table, check if the encryption info in data
	file can't be retrieved properly, mark it as corrupted. */
	if (ib_table != NULL
	    && dict_table_is_encrypted(ib_table)
	    && ib_table->ibd_file_missing) {

		/* Mark this table as corrupted, so the drop table
		or force recovery can still use it, but not others. */

		dict_table_close(ib_table, FALSE, FALSE);
		ib_table = NULL;
		is_part = NULL;

		free_share(m_share);
		my_error(ER_CANNOT_FIND_KEY_IN_KEYRING, MYF(0));

		DBUG_RETURN(HA_ERR_TABLE_CORRUPT);
	}

	if (NULL == ib_table) {

		if (is_part) {
			sql_print_error("Failed to open table %s.\n",
					norm_name);
		}

		ib::warn() << "Cannot open table " << norm_name << " from the"
			" internal data dictionary of InnoDB though the .frm"
			" file for the table exists. " << TROUBLESHOOTING_MSG;

		free_share(m_share);
		set_my_errno(ENOENT);

		DBUG_RETURN(HA_ERR_NO_SUCH_TABLE);
	}

	innobase_copy_frm_flags_from_table_share(ib_table, table->s);

	dict_stats_init(ib_table);

	MONITOR_INC(MONITOR_TABLE_OPEN);

	bool	no_tablespace;

	if (dict_table_is_discarded(ib_table)) {

		ib_senderrf(thd,
			IB_LOG_LEVEL_WARN, ER_TABLESPACE_DISCARDED,
			table->s->table_name.str);

		/* Allow an open because a proper DISCARD should have set
		all the flags and index root page numbers to FIL_NULL that
		should prevent any DML from running but it should allow DDL
		operations. */

		no_tablespace = false;

	} else if (ib_table->ibd_file_missing) {

		ib_senderrf(
			thd, IB_LOG_LEVEL_WARN,
			ER_TABLESPACE_MISSING, norm_name);

		/* This means we have no idea what happened to the tablespace
		file, best to play it safe. */

		no_tablespace = true;
	} else {
		no_tablespace = false;
	}

	if (!thd_tablespace_op(thd) && no_tablespace) {
		free_share(m_share);
		set_my_errno(ENOENT);

		dict_table_close(ib_table, FALSE, FALSE);

		DBUG_RETURN(HA_ERR_TABLESPACE_MISSING);
	}

	m_prebuilt = row_create_prebuilt(ib_table, table->s->reclength);

	m_prebuilt->default_rec = table->s->default_values;
	ut_ad(m_prebuilt->default_rec);

	m_prebuilt->m_mysql_table = table;

	/* Looks like MySQL-3.23 sometimes has primary key number != 0 */
	m_primary_key = table->s->primary_key;

	key_used_on_scan = m_primary_key;

	if (ib_table->n_v_cols) {
		mutex_enter(&dict_sys->mutex);
		if (ib_table->vc_templ == NULL) {
			ib_table->vc_templ = UT_NEW_NOKEY(dict_vcol_templ_t());
			ib_table->vc_templ->vtempl = NULL;
		} else if (ib_table->get_ref_count() == 1) {
			/* Clean and refresh the template if no one else
			get hold on it */
			dict_free_vc_templ(ib_table->vc_templ);
			ib_table->vc_templ->vtempl = NULL;
		}

		if (ib_table->vc_templ->vtempl == NULL) {
			innobase_build_v_templ(
				table, ib_table, ib_table->vc_templ, NULL,
				true, m_share->table_name);
		}

		mutex_exit(&dict_sys->mutex);
	}

	if (!innobase_build_index_translation(table, ib_table, m_share)) {
		  sql_print_error("Build InnoDB index translation table for"
				  " Table %s failed", name);
	}

	/* Allocate a buffer for a 'row reference'. A row reference is
	a string of bytes of length ref_length which uniquely specifies
	a row in our table. Note that MySQL may also compare two row
	references for equality by doing a simple memcmp on the strings
	of length ref_length! */

	if (!row_table_got_default_clust_index(ib_table)) {

		m_prebuilt->clust_index_was_generated = FALSE;

		if (m_primary_key >= MAX_KEY) {
			sql_print_error("Table %s has a primary key in"
					" InnoDB data dictionary, but not"
					" in MySQL!", name);

			/* This mismatch could cause further problems
			if not attended, bring this to the user's attention
			by printing a warning in addition to log a message
			in the errorlog */
			push_warning_printf(thd, Sql_condition::SL_WARNING,
					    ER_NO_SUCH_INDEX,
					    "InnoDB: Table %s has a"
					    " primary key in InnoDB data"
					    " dictionary, but not in"
					    " MySQL!", name);

			/* If m_primary_key >= MAX_KEY, its (m_primary_key)
			value could be out of bound if continue to index
			into key_info[] array. Find InnoDB primary index,
			and assign its key_length to ref_length.
			In addition, since MySQL indexes are sorted starting
			with primary index, unique index etc., initialize
			ref_length to the first index key length in
			case we fail to find InnoDB cluster index.

			Please note, this will not resolve the primary
			index mismatch problem, other side effects are
			possible if users continue to use the table.
			However, we allow this table to be opened so
			that user can adopt necessary measures for the
			mismatch while still being accessible to the table
			date. */
			if (!table->key_info) {
				ut_ad(!table->s->keys);
				ref_length = 0;
			} else {
				ref_length = table->key_info[0].key_length;
			}

			/* Find corresponding cluster index
			key length in MySQL's key_info[] array */
			for (uint i = 0; i < table->s->keys; i++) {
				dict_index_t*	index;
				index = innobase_get_index(i);
				if (dict_index_is_clust(index)) {
					ref_length =
						 table->key_info[i].key_length;
				}
			}
		} else {
			/* MySQL allocates the buffer for ref.
			key_info->key_length includes space for all key
			columns + one byte for each column that may be
			NULL. ref_length must be as exact as possible to
			save space, because all row reference buffers are
			allocated based on ref_length. */

			ref_length = table->key_info[m_primary_key].key_length;
		}
	} else {
		if (m_primary_key != MAX_KEY) {
			sql_print_error(
				"Table %s has no primary key in InnoDB data"
				" dictionary, but has one in MySQL! If you"
				" created the table with a MySQL version <"
				" 3.23.54 and did not define a primary key,"
				" but defined a unique key with all non-NULL"
				" columns, then MySQL internally treats that"
				" key as the primary key. You can fix this"
				" error by dump + DROP + CREATE + reimport"
				" of the table.", name);

			/* This mismatch could cause further problems
			if not attended, bring this to the user attention
			by printing a warning in addition to log a message
			in the errorlog */
			push_warning_printf(thd, Sql_condition::SL_WARNING,
					    ER_NO_SUCH_INDEX,
					    "InnoDB: Table %s has no"
					    " primary key in InnoDB data"
					    " dictionary, but has one in"
					    " MySQL!", name);
		}

		m_prebuilt->clust_index_was_generated = TRUE;

		ref_length = DATA_ROW_ID_LEN;

		/* If we automatically created the clustered index, then
		MySQL does not know about it, and MySQL must NOT be aware
		of the index used on scan, to make it avoid checking if we
		update the column of the index. That is why we assert below
		that key_used_on_scan is the undefined value MAX_KEY.
		The column is the row id in the automatical generation case,
		and it will never be updated anyway. */

		if (key_used_on_scan != MAX_KEY) {
			sql_print_warning(
				"Table %s key_used_on_scan is %lu even"
				" though there is no primary key inside"
				" InnoDB.", name, (ulong) key_used_on_scan);
		}
	}

	/* Index block size in InnoDB: used by MySQL in query optimization */
	stats.block_size = UNIV_PAGE_SIZE;

	if (m_prebuilt->table != NULL) {
		/* We update the highest file format in the system table
		space, if this table has higher file format setting. */

		trx_sys_file_format_max_upgrade(
			(const char**) &innobase_file_format_max,
			dict_table_get_format(m_prebuilt->table));
	}

	/* Only if the table has an AUTOINC column. */
	if (m_prebuilt->table != NULL
	    && !m_prebuilt->table->ibd_file_missing
	    && table->found_next_number_field != NULL) {
		dict_table_autoinc_lock(m_prebuilt->table);

		/* Since a table can already be "open" in InnoDB's internal
		data dictionary, we only init the autoinc counter once, the
		first time the table is loaded. We can safely reuse the
		autoinc value from a previous MySQL open. */
		if (dict_table_autoinc_read(m_prebuilt->table) == 0) {

			innobase_initialize_autoinc();
		}

		dict_table_autoinc_unlock(m_prebuilt->table);
	}

	/* Set plugin parser for fulltext index */
	for (uint i = 0; i < table->s->keys; i++) {
		if (table->key_info[i].flags & HA_USES_PARSER) {
			dict_index_t*	index = innobase_get_index(i);
			plugin_ref	parser = table->key_info[i].parser;

			ut_ad(index->type & DICT_FTS);
			index->parser =
				static_cast<st_mysql_ftparser *>(
					plugin_decl(parser)->info);

			index->is_ngram = strncmp(
				plugin_name(parser)->str,
				FTS_NGRAM_PARSER_NAME,
				plugin_name(parser)->length) == 0;

			DBUG_EXECUTE_IF("fts_instrument_use_default_parser",
				index->parser = &fts_default_parser;);
		}
	}

	info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);

	/* We don't support compression for the system tablespace and
	the temporary tablespace. Only because they are shared tablespaces.
	There is no other technical reason. */

	if (m_prebuilt->table != NULL
	    && !m_prebuilt->table->ibd_file_missing
	    && !is_shared_tablespace(m_prebuilt->table->space)) {

		dberr_t	err = fil_set_compression(
			m_prebuilt->table->space, table->s->compress.str);

		switch (err) {
		case DB_NOT_FOUND:
		case DB_UNSUPPORTED:
			/* We will do another check before the create
			table and push the error to the client there. */
			break;

		case DB_IO_NO_PUNCH_HOLE_TABLESPACE:
			/* We did the check in the 'if' above. */

		case DB_IO_NO_PUNCH_HOLE_FS:
			/* During open we can't check whether the FS supports
			punch hole or not, at least on Linux. */
			break;

		default:
			ut_error;

		case DB_SUCCESS:
			break;
		}
	}

	DBUG_RETURN(0);
}

/** Opens dictionary table object using table name. For partition, we need to
try alternative lower/upper case names to support moving data files across
platforms.
@param[in]	table_name	name of the table/partition
@param[in]	norm_name	normalized name of the table/partition
@param[in]	is_partition	if this is a partition of a table
@param[in]	ignore_err	error to ignore for loading dictionary object
@return dictionary table object or NULL if not found */
dict_table_t*
ha_innobase::open_dict_table(
	const char*		table_name,
	const char*		norm_name,
	bool			is_partition,
	dict_err_ignore_t	ignore_err)
{
	DBUG_ENTER("ha_innobase::open_dict_table");
	dict_table_t*	ib_table = dict_table_open_on_name(norm_name, FALSE,
							   TRUE, ignore_err);

	if (NULL == ib_table && is_partition) {
		/* MySQL partition engine hard codes the file name
		separator as "#P#". The text case is fixed even if
		lower_case_table_names is set to 1 or 2. This is true
		for sub-partition names as well. InnoDB always
		normalises file names to lower case on Windows, this
		can potentially cause problems when copying/moving
		tables between platforms.

		1) If boot against an installation from Windows
		platform, then its partition table name could
		be in lower case in system tables. So we will
		need to check lower case name when load table.

		2) If we boot an installation from other case
		sensitive platform in Windows, we might need to
		check the existence of table name without lower
		case in the system table. */
		if (innobase_get_lower_case_table_names() == 1) {
			char	par_case_name[FN_REFLEN];

#ifndef _WIN32
			/* Check for the table using lower
			case name, including the partition
			separator "P" */
			strcpy(par_case_name, norm_name);
			innobase_casedn_str(par_case_name);
#else
			/* On Windows platfrom, check
			whether there exists table name in
			system table whose name is
			not being normalized to lower case */
			create_table_info_t::
				normalize_table_name_low(
					par_case_name,
					table_name, FALSE);
#endif
			ib_table = dict_table_open_on_name(
				par_case_name, FALSE, TRUE,
				ignore_err);
		}

		if (ib_table != NULL) {
#ifndef _WIN32
			sql_print_warning("Partition table %s opened"
					  " after converting to lower"
					  " case. The table may have"
					  " been moved from a case"
					  " in-sensitive file system."
					  " Please recreate table in"
					  " the current file system\n",
					  norm_name);
#else
			sql_print_warning("Partition table %s opened"
					  " after skipping the step to"
					  " lower case the table name."
					  " The table may have been"
					  " moved from a case sensitive"
					  " file system. Please"
					  " recreate table in the"
					  " current file system\n",
					  norm_name);
#endif
		}
	}

	DBUG_RETURN(ib_table);
}

handler*
ha_innobase::clone(
/*===============*/
	const char*	name,		/*!< in: table name */
	MEM_ROOT*	mem_root)	/*!< in: memory context */
{
	DBUG_ENTER("ha_innobase::clone");

	ha_innobase*	new_handler = dynamic_cast<ha_innobase*>(
		handler::clone(name, mem_root));

	if (new_handler != NULL) {
		DBUG_ASSERT(new_handler->m_prebuilt != NULL);

		new_handler->m_prebuilt->select_lock_type
			= m_prebuilt->select_lock_type;
	}

	DBUG_RETURN(new_handler);
}


uint
ha_innobase::max_supported_key_part_length() const
/*==============================================*/
{
	/* A table format specific index column length check will be performed
	at ha_innobase::add_index() and row_create_index_for_mysql() */
	return(innobase_large_prefix
		? REC_VERSION_56_MAX_INDEX_COL_LEN
		: REC_ANTELOPE_MAX_INDEX_COL_LEN - 1);
}

/******************************************************************//**
Closes a handle to an InnoDB table.
@return 0 */

int
ha_innobase::close()
/*================*/
{
	DBUG_ENTER("ha_innobase::close");

	THD*	thd = ha_thd();

	/* No-op in XtraDB */
	innobase_release_temporary_latches(ht, thd);

	row_prebuilt_free(m_prebuilt, FALSE);

	if (m_upd_buf != NULL) {
		ut_ad(m_upd_buf_size != 0);
		my_free(m_upd_buf);
		m_upd_buf = NULL;
		m_upd_buf_size = 0;
	}

	free_share(m_share);

	MONITOR_INC(MONITOR_TABLE_CLOSE);

	/* Tell InnoDB server that there might be work for
	utility threads: */

	srv_active_wake_master_thread();

	DBUG_RETURN(0);
}

/* The following accessor functions should really be inside MySQL code! */

/** Gets field offset for a field in a table.
@param[in]	table	MySQL table object
@param[in]	field	MySQL field object
@return offset */
static inline
uint
get_field_offset(
	const TABLE*	table,
	const Field*	field)
{
	return(static_cast<uint>((field->ptr - table->record[0])));
}

/******************************************************************//**
compare two character string according to their charset. */
int
innobase_fts_text_cmp(
/*==================*/
	const void*	cs,		/*!< in: Character set */
	const void*     p1,		/*!< in: key */
	const void*     p2)		/*!< in: node */
{
	const CHARSET_INFO*	charset = (const CHARSET_INFO*) cs;
	const fts_string_t*	s1 = (const fts_string_t*) p1;
	const fts_string_t*	s2 = (const fts_string_t*) p2;

	return(ha_compare_text(
		charset, s1->f_str, static_cast<uint>(s1->f_len),
		s2->f_str, static_cast<uint>(s2->f_len), 0, 0));
}

/******************************************************************//**
compare two character string case insensitively according to their charset. */
int
innobase_fts_text_case_cmp(
/*=======================*/
	const void*	cs,		/*!< in: Character set */
	const void*     p1,		/*!< in: key */
	const void*     p2)		/*!< in: node */
{
	const CHARSET_INFO*	charset = (const CHARSET_INFO*) cs;
	const fts_string_t*	s1 = (const fts_string_t*) p1;
	const fts_string_t*	s2 = (const fts_string_t*) p2;
	ulint			newlen;

	my_casedn_str(charset, (char*) s2->f_str);

	newlen = strlen((const char*) s2->f_str);

	return(ha_compare_text(
		charset, s1->f_str, static_cast<uint>(s1->f_len),
		s2->f_str, static_cast<uint>(newlen), 0, 0));
}

/******************************************************************//**
Get the first character's code position for FTS index partition. */
ulint
innobase_strnxfrm(
/*==============*/
	const CHARSET_INFO*
			cs,		/*!< in: Character set */
	const uchar*	str,		/*!< in: string */
	const ulint	len)		/*!< in: string length */
{
	uchar		mystr[2];
	ulint		value;

	if (!str || len == 0) {
		return(0);
	}

	my_strnxfrm(cs, (uchar*) mystr, 2, str, len);

	value = mach_read_from_2(mystr);

	if (value > 255) {
		value = value / 256;
	}

	return(value);
}

/******************************************************************//**
compare two character string according to their charset. */
int
innobase_fts_text_cmp_prefix(
/*=========================*/
	const void*	cs,		/*!< in: Character set */
	const void*	p1,		/*!< in: prefix key */
	const void*	p2)		/*!< in: value to compare */
{
	const CHARSET_INFO*	charset = (const CHARSET_INFO*) cs;
	const fts_string_t*	s1 = (const fts_string_t*) p1;
	const fts_string_t*	s2 = (const fts_string_t*) p2;
	int			result;

	result = ha_compare_text(
		charset, s2->f_str, static_cast<uint>(s2->f_len),
		s1->f_str, static_cast<uint>(s1->f_len), 1, 0);

	/* We switched s1, s2 position in ha_compare_text. So we need
	to negate the result */
	return(-result);
}

/******************************************************************//**
Makes all characters in a string lower case. */
size_t
innobase_fts_casedn_str(
/*====================*/
	CHARSET_INFO*	cs,	/*!< in: Character set */
	char*		src,	/*!< in: string to put in lower case */
	size_t		src_len,/*!< in: input string length */
	char*		dst,	/*!< in: buffer for result string */
	size_t		dst_len)/*!< in: buffer size */
{
	if (cs->casedn_multiply == 1) {
		memcpy(dst, src, src_len);
		dst[src_len] = 0;
		my_casedn_str(cs, dst);

		return(strlen(dst));
	} else {
		return(cs->cset->casedn(cs, src, src_len, dst, dst_len));
	}
}

#define true_word_char(c, ch) ((c) & (_MY_U | _MY_L | _MY_NMR) || (ch) == '_')

#define misc_word_char(X)       0

/*************************************************************//**
Get the next token from the given string and store it in *token.
It is mostly copied from MyISAM's doc parsing function ft_simple_get_word()
@return length of string processed */
ulint
innobase_mysql_fts_get_token(
/*=========================*/
	CHARSET_INFO*	cs,		/*!< in: Character set */
	const byte*	start,		/*!< in: start of text */
	const byte*	end,		/*!< in: one character past end of
					text */
	fts_string_t*	token)		/*!< out: token's text */
{
	int		mbl;
	const uchar*	doc = start;

	ut_a(cs);

	token->f_n_char = token->f_len = 0;
	token->f_str = NULL;

	for (;;) {

		if (doc >= end) {
			return(doc - start);
		}

		int	ctype;

		mbl = cs->cset->ctype(
			cs, &ctype, doc, (const uchar*) end);

		if (true_word_char(ctype, *doc)) {
			break;
		}

		doc += mbl > 0 ? mbl : (mbl < 0 ? -mbl : 1);
	}

	ulint	mwc = 0;
	ulint	length = 0;

	token->f_str = const_cast<byte*>(doc);

	while (doc < end) {

		int	ctype;

		mbl = cs->cset->ctype(
			cs, &ctype, (uchar*) doc, (uchar*) end);
		if (true_word_char(ctype, *doc)) {
			mwc = 0;
		} else if (!misc_word_char(*doc) || mwc) {
			break;
		} else {
			++mwc;
		}

		++length;

		doc += mbl > 0 ? mbl : (mbl < 0 ? -mbl : 1);
	}

	token->f_len = (uint) (doc - token->f_str) - mwc;
	token->f_n_char = length;

	return(doc - start);
}

/** Converts a MySQL type to an InnoDB type. Note that this function returns
the 'mtype' of InnoDB. InnoDB differentiates between MySQL's old <= 4.1
VARCHAR and the new true VARCHAR in >= 5.0.3 by the 'prtype'.
@param[out]	unsigned_flag	DATA_UNSIGNED if an 'unsigned type'; at least
ENUM and SET, and unsigned integer types are 'unsigned types'
@param[in]	f		MySQL Field
@return DATA_BINARY, DATA_VARCHAR, ... */
ulint
get_innobase_type_from_mysql_type(
	ulint*			unsigned_flag,
	const void*		f)
{
	const class Field* field = reinterpret_cast<const class Field*>(f);

	/* The following asserts try to check that the MySQL type code fits in
	8 bits: this is used in ibuf and also when DATA_NOT_NULL is ORed to
	the type */

	DBUG_ASSERT((ulint)MYSQL_TYPE_STRING < 256);
	DBUG_ASSERT((ulint)MYSQL_TYPE_VAR_STRING < 256);
	DBUG_ASSERT((ulint)MYSQL_TYPE_DOUBLE < 256);
	DBUG_ASSERT((ulint)MYSQL_TYPE_FLOAT < 256);
	DBUG_ASSERT((ulint)MYSQL_TYPE_DECIMAL < 256);

	if (field->flags & UNSIGNED_FLAG) {

		*unsigned_flag = DATA_UNSIGNED;
	} else {
		*unsigned_flag = 0;
	}

	if (field->real_type() == MYSQL_TYPE_ENUM
		|| field->real_type() == MYSQL_TYPE_SET) {

		/* MySQL has field->type() a string type for these, but the
		data is actually internally stored as an unsigned integer
		code! */

		*unsigned_flag = DATA_UNSIGNED; /* MySQL has its own unsigned
						flag set to zero, even though
						internally this is an unsigned
						integer type */
		return(DATA_INT);
	}

	switch (field->type()) {
		/* NOTE that we only allow string types in DATA_MYSQL and
		DATA_VARMYSQL */
	case MYSQL_TYPE_VAR_STRING:	/* old <= 4.1 VARCHAR */
	case MYSQL_TYPE_VARCHAR:	/* new >= 5.0.3 true VARCHAR */
		if (field->binary()) {
			return(DATA_BINARY);
		} else if (strcmp(field->charset()->name,
				  "latin1_swedish_ci") == 0) {
			return(DATA_VARCHAR);
		} else {
			return(DATA_VARMYSQL);
		}
	case MYSQL_TYPE_BIT:
	case MYSQL_TYPE_STRING: if (field->binary()) {

			return(DATA_FIXBINARY);
		} else if (strcmp(field->charset()->name,
				  "latin1_swedish_ci") == 0) {
			return(DATA_CHAR);
		} else {
			return(DATA_MYSQL);
		}
	case MYSQL_TYPE_NEWDECIMAL:
		return(DATA_FIXBINARY);
	case MYSQL_TYPE_LONG:
	case MYSQL_TYPE_LONGLONG:
	case MYSQL_TYPE_TINY:
	case MYSQL_TYPE_SHORT:
	case MYSQL_TYPE_INT24:
	case MYSQL_TYPE_DATE:
	case MYSQL_TYPE_YEAR:
	case MYSQL_TYPE_NEWDATE:
		return(DATA_INT);
	case MYSQL_TYPE_TIME:
	case MYSQL_TYPE_DATETIME:
	case MYSQL_TYPE_TIMESTAMP:
		switch (field->real_type()) {
		case MYSQL_TYPE_TIME:
		case MYSQL_TYPE_DATETIME:
		case MYSQL_TYPE_TIMESTAMP:
			return(DATA_INT);
		default: /* Fall through */
			DBUG_ASSERT((ulint)MYSQL_TYPE_DECIMAL < 256);
		case MYSQL_TYPE_TIME2:
		case MYSQL_TYPE_DATETIME2:
		case MYSQL_TYPE_TIMESTAMP2:
			return(DATA_FIXBINARY);
		}
	case MYSQL_TYPE_FLOAT:
		return(DATA_FLOAT);
	case MYSQL_TYPE_DOUBLE:
		return(DATA_DOUBLE);
	case MYSQL_TYPE_DECIMAL:
		return(DATA_DECIMAL);
	case MYSQL_TYPE_GEOMETRY:
		return(DATA_GEOMETRY);
	case MYSQL_TYPE_TINY_BLOB:
	case MYSQL_TYPE_MEDIUM_BLOB:
	case MYSQL_TYPE_BLOB:
	case MYSQL_TYPE_LONG_BLOB:
        case MYSQL_TYPE_JSON:   // JSON fields are stored as BLOBs
		return(DATA_BLOB);
	case MYSQL_TYPE_NULL:
		/* MySQL currently accepts "NULL" datatype, but will
		reject such datatype in the next release. We will cope
		with it and not trigger assertion failure in 5.1 */
		break;
	default:
		ut_error;
	}

	return(0);
}

/*******************************************************************//**
Reads an unsigned integer value < 64k from 2 bytes, in the little-endian
storage format.
@return value */
static inline
uint
innobase_read_from_2_little_endian(
/*===============================*/
	const uchar*	buf)	/*!< in: from where to read */
{
	return((uint) ((ulint)(buf[0]) + 256 * ((ulint)(buf[1]))));
}

/**************************************************************//**
Determines if a field is needed in a m_prebuilt struct 'template'.
@return field to use, or NULL if the field is not needed */
static
const Field*
build_template_needs_field(
/*=======================*/
	ibool		index_contains,	/*!< in:
					dict_index_contains_col_or_prefix(
					index, i) */
	ibool		read_just_key,	/*!< in: TRUE when MySQL calls
					ha_innobase::extra with the
					argument HA_EXTRA_KEYREAD; it is enough
					to read just columns defined in
					the index (i.e., no read of the
					clustered index record necessary) */
	ibool		fetch_all_in_key,
					/*!< in: true=fetch all fields in
					the index */
	ibool		fetch_primary_key_cols,
					/*!< in: true=fetch the
					primary key columns */
	dict_index_t*	index,		/*!< in: InnoDB index to use */
	const TABLE*	table,		/*!< in: MySQL table object */
	ulint		i,		/*!< in: field index in InnoDB table */
	ulint		num_v)		/*!< in: num virtual column so far */
{
	const Field*	field	= table->field[i];

	if (!index_contains) {
		if (read_just_key) {
			/* If this is a 'key read', we do not need
			columns that are not in the key */

			return(NULL);
		}
	} else if (fetch_all_in_key) {
		/* This field is needed in the query */

		return(field);
	}

	if (bitmap_is_set(table->read_set, static_cast<uint>(i))
	    || bitmap_is_set(table->write_set, static_cast<uint>(i))) {
		/* This field is needed in the query */

		return(field);
	}

	ut_ad(i >= num_v);
	if (fetch_primary_key_cols
	    && dict_table_col_in_clustered_key(index->table, i - num_v)) {
		/* This field is needed in the query */

		return(field);
	}

	/* This field is not needed in the query, skip it */

	return(NULL);
}

/**************************************************************//**
Determines if a field is needed in a m_prebuilt struct 'template'.
@return whether the field is needed for index condition pushdown */
inline
bool
build_template_needs_field_in_icp(
/*==============================*/
	const dict_index_t*	index,	/*!< in: InnoDB index */
	const row_prebuilt_t*	prebuilt,/*!< in: row fetch template */
	bool			contains,/*!< in: whether the index contains
					column i */
	ulint			i,	/*!< in: column number */
	bool			is_virtual)
					/*!< in: a virtual column or not */
{
	ut_ad(contains == dict_index_contains_col_or_prefix(index, i, is_virtual));

	return(index == prebuilt->index
	       ? contains
	       : dict_index_contains_col_or_prefix(prebuilt->index, i, is_virtual));
}

/**************************************************************//**
Adds a field to a m_prebuilt struct 'template'.
@return the field template */
static
mysql_row_templ_t*
build_template_field(
/*=================*/
	row_prebuilt_t*	prebuilt,	/*!< in/out: template */
	dict_index_t*	clust_index,	/*!< in: InnoDB clustered index */
	dict_index_t*	index,		/*!< in: InnoDB index to use */
	TABLE*		table,		/*!< in: MySQL table object */
	const Field*	field,		/*!< in: field in MySQL table */
	ulint		i,		/*!< in: field index in InnoDB table */
	ulint		v_no)		/*!< in: field index for virtual col */
{
	mysql_row_templ_t*	templ;
	const dict_col_t*	col;

	ut_ad(clust_index->table == index->table);

	templ = prebuilt->mysql_template + prebuilt->n_template++;
	UNIV_MEM_INVALID(templ, sizeof *templ);

	if (innobase_is_v_fld(field)) {
		templ->is_virtual = true;
		col = &dict_table_get_nth_v_col(index->table, v_no)->m_col;
	} else {
		templ->is_virtual = false;
		col = dict_table_get_nth_col(index->table, i);
	}

	if (!templ->is_virtual) {
		templ->col_no = i;
		templ->clust_rec_field_no = dict_col_get_clust_pos(
						col, clust_index);
		ut_a(templ->clust_rec_field_no != ULINT_UNDEFINED);

		if (dict_index_is_clust(index)) {
			templ->rec_field_no = templ->clust_rec_field_no;
		} else {
			templ->rec_field_no = dict_index_get_nth_col_pos(
						index, i);
		}
	} else {
		templ->clust_rec_field_no = v_no;
		if (dict_index_is_clust(index)) {
			templ->rec_field_no = templ->clust_rec_field_no;
		} else {
			templ->rec_field_no
				= dict_index_get_nth_col_or_prefix_pos(
					index, v_no, FALSE, true);
		}
		templ->icp_rec_field_no = ULINT_UNDEFINED;
	}

	if (field->real_maybe_null()) {
		templ->mysql_null_byte_offset =
			field->null_offset();

		templ->mysql_null_bit_mask = (ulint) field->null_bit;
	} else {
		templ->mysql_null_bit_mask = 0;
	}


	templ->mysql_col_offset = (ulint) get_field_offset(table, field);
	templ->mysql_col_len = (ulint) field->pack_length();
	templ->type = col->mtype;
	templ->mysql_type = (ulint) field->type();

	if (templ->mysql_type == DATA_MYSQL_TRUE_VARCHAR) {
		templ->mysql_length_bytes = (ulint)
			(((Field_varstring*) field)->length_bytes);
	} else {
		templ->mysql_length_bytes = 0;
	}

	templ->charset = dtype_get_charset_coll(col->prtype);
	templ->mbminlen = dict_col_get_mbminlen(col);
	templ->mbmaxlen = dict_col_get_mbmaxlen(col);
	templ->is_unsigned = col->prtype & DATA_UNSIGNED;

	if (!dict_index_is_clust(index)
	    && templ->rec_field_no == ULINT_UNDEFINED) {
		prebuilt->need_to_access_clustered = TRUE;
	}

	/* For spatial index, we need to access cluster index. */
	if (dict_index_is_spatial(index)) {
		prebuilt->need_to_access_clustered = TRUE;
	}

	if (prebuilt->mysql_prefix_len < templ->mysql_col_offset
	    + templ->mysql_col_len) {
		prebuilt->mysql_prefix_len = templ->mysql_col_offset
			+ templ->mysql_col_len;
	}

	if (DATA_LARGE_MTYPE(templ->type)) {
		prebuilt->templ_contains_blob = TRUE;
	}

	if (templ->type == DATA_POINT) {
		/* We set this only when it's DATA_POINT, but not
		DATA_VAR_POINT */
		prebuilt->templ_contains_fixed_point = TRUE;
	}

	return(templ);
}

/**************************************************************//**
Builds a 'template' to the m_prebuilt struct. The template is used in fast
retrieval of just those column values MySQL needs in its processing. */

void
ha_innobase::build_template(
/*========================*/
	bool		whole_row)	/*!< in: true=ROW_MYSQL_WHOLE_ROW,
					false=ROW_MYSQL_REC_FIELDS */
{
	dict_index_t*	index;
	dict_index_t*	clust_index;
	ulint		n_fields;
	ibool		fetch_all_in_key	= FALSE;
	ibool		fetch_primary_key_cols	= FALSE;
	ulint		i;

	if (m_prebuilt->select_lock_type == LOCK_X) {
		/* We always retrieve the whole clustered index record if we
		use exclusive row level locks, for example, if the read is
		done in an UPDATE statement. */

		whole_row = true;
	} else if (!whole_row) {
		if (m_prebuilt->hint_need_to_fetch_extra_cols
			== ROW_RETRIEVE_ALL_COLS) {

			/* We know we must at least fetch all columns in the
			key, or all columns in the table */

			if (m_prebuilt->read_just_key) {
				/* MySQL has instructed us that it is enough
				to fetch the columns in the key; looks like
				MySQL can set this flag also when there is
				only a prefix of the column in the key: in
				that case we retrieve the whole column from
				the clustered index */

				fetch_all_in_key = TRUE;
			} else {
				whole_row = true;
			}
		} else if (m_prebuilt->hint_need_to_fetch_extra_cols
			== ROW_RETRIEVE_PRIMARY_KEY) {
			/* We must at least fetch all primary key cols. Note
			that if the clustered index was internally generated
			by InnoDB on the row id (no primary key was
			defined), then row_search_for_mysql() will always
			retrieve the row id to a special buffer in the
			m_prebuilt struct. */

			fetch_primary_key_cols = TRUE;
		}
	}

	clust_index = dict_table_get_first_index(m_prebuilt->table);

	index = whole_row ? clust_index : m_prebuilt->index;

	m_prebuilt->need_to_access_clustered = (index == clust_index);

	/* Either m_prebuilt->index should be a secondary index, or it
	should be the clustered index. */
	ut_ad(dict_index_is_clust(index) == (index == clust_index));

	/* Below we check column by column if we need to access
	the clustered index. */

	n_fields = (ulint) table->s->fields; /* number of columns */

	if (!m_prebuilt->mysql_template) {
		m_prebuilt->mysql_template = (mysql_row_templ_t*)
			ut_malloc_nokey(n_fields * sizeof(mysql_row_templ_t));
	}

	m_prebuilt->template_type = whole_row
		? ROW_MYSQL_WHOLE_ROW : ROW_MYSQL_REC_FIELDS;
	m_prebuilt->null_bitmap_len = table->s->null_bytes;

	/* Prepare to build m_prebuilt->mysql_template[]. */
	m_prebuilt->templ_contains_blob = FALSE;
	m_prebuilt->templ_contains_fixed_point = FALSE;
	m_prebuilt->mysql_prefix_len = 0;
	m_prebuilt->n_template = 0;
	m_prebuilt->idx_cond_n_cols = 0;

	/* Note that in InnoDB, i is the column number in the table.
	MySQL calls columns 'fields'. */

	if (active_index != MAX_KEY
	    && active_index == pushed_idx_cond_keyno) {
		ulint	num_v = 0;

		/* Push down an index condition or an end_range check. */
		for (i = 0; i < n_fields; i++) {
			ibool		index_contains;

			if (innobase_is_v_fld(table->field[i])) {
				index_contains = dict_index_contains_col_or_prefix(
					index, num_v, true);
			} else {
				index_contains = dict_index_contains_col_or_prefix(
					index, i - num_v, false);
			}

			/* Test if an end_range or an index condition
			refers to the field. Note that "index" and
			"index_contains" may refer to the clustered index.
			Index condition pushdown is relative to
			m_prebuilt->index (the index that is being
			looked up first). */

			/* When join_read_always_key() invokes this
			code via handler::ha_index_init() and
			ha_innobase::index_init(), end_range is not
			yet initialized. Because of that, we must
			always check for index_contains, instead of
			the subset
			field->part_of_key.is_set(active_index)
			which would be acceptable if end_range==NULL. */
			bool	is_v = innobase_is_v_fld(table->field[i]);
			if (build_template_needs_field_in_icp(
				    index, m_prebuilt, index_contains,
				    is_v ? num_v : i - num_v, is_v)) {
				/* Needed in ICP */
				const Field*		field;
				mysql_row_templ_t*	templ;

				if (whole_row) {
					field = table->field[i];
				} else {
					field = build_template_needs_field(
						index_contains,
						m_prebuilt->read_just_key,
						fetch_all_in_key,
						fetch_primary_key_cols,
						index, table, i, num_v);
					if (!field) {
						if (innobase_is_v_fld(
							table->field[i])) {
							num_v++;
						}
						continue;
					}
				}

				templ = build_template_field(
					m_prebuilt, clust_index, index,
					table, field, i - num_v, 0);

				ut_ad(!templ->is_virtual);

				m_prebuilt->idx_cond_n_cols++;
				ut_ad(m_prebuilt->idx_cond_n_cols
				      == m_prebuilt->n_template);

				if (index == m_prebuilt->index) {
					templ->icp_rec_field_no
						= templ->rec_field_no;
				} else {
					templ->icp_rec_field_no
						= dict_index_get_nth_col_pos(
							m_prebuilt->index,
							i - num_v);
				}

				if (dict_index_is_clust(m_prebuilt->index)) {
					ut_ad(templ->icp_rec_field_no
					      != ULINT_UNDEFINED);
					/* If the primary key includes
					a column prefix, use it in
					index condition pushdown,
					because the condition is
					evaluated before fetching any
					off-page (externally stored)
					columns. */
					if (templ->icp_rec_field_no
					    < m_prebuilt->index->n_uniq) {
						/* This is a key column;
						all set. */
						continue;
					}
				} else if (templ->icp_rec_field_no
					   != ULINT_UNDEFINED) {
					continue;
				}

				/* This is a column prefix index.
				The column prefix can be used in
				an end_range comparison. */

				templ->icp_rec_field_no
					= dict_index_get_nth_col_or_prefix_pos(
						m_prebuilt->index, i - num_v,
						true, false);
				ut_ad(templ->icp_rec_field_no
				      != ULINT_UNDEFINED);

				/* Index condition pushdown can be used on
				all columns of a secondary index, and on
				the PRIMARY KEY columns. On the clustered
				index, it must never be used on other than
				PRIMARY KEY columns, because those columns
				may be stored off-page, and we will not
				fetch externally stored columns before
				checking the index condition. */
				/* TODO: test the above with an assertion
				like this. Note that index conditions are
				currently pushed down as part of the
				"optimizer phase" while end_range is done
				as part of the execution phase. Therefore,
				we were unable to use an accurate condition
				for end_range in the "if" condition above,
				and the following assertion would fail.
				ut_ad(!dict_index_is_clust(m_prebuilt->index)
				      || templ->rec_field_no
				      < m_prebuilt->index->n_uniq);
				*/
			}
			if (innobase_is_v_fld(table->field[i])) {
				num_v++;
			}
		}

		ut_ad(m_prebuilt->idx_cond_n_cols > 0);
		ut_ad(m_prebuilt->idx_cond_n_cols == m_prebuilt->n_template);

		num_v = 0;

		/* Include the fields that are not needed in index condition
		pushdown. */
		for (i = 0; i < n_fields; i++) {
			mysql_row_templ_t*	templ;
			ibool			index_contains;

			if (innobase_is_v_fld(table->field[i])) {
				index_contains = dict_index_contains_col_or_prefix(
					index, num_v, true);
			} else {
				index_contains = dict_index_contains_col_or_prefix(
					index, i - num_v, false);
			}

			bool	is_v = innobase_is_v_fld(table->field[i]);

			if (!build_template_needs_field_in_icp(
				    index, m_prebuilt, index_contains,
				    is_v ? num_v : i - num_v, is_v)) {
				/* Not needed in ICP */
				const Field*	field;

				if (whole_row) {
					field = table->field[i];
				} else {
					field = build_template_needs_field(
						index_contains,
						m_prebuilt->read_just_key,
						fetch_all_in_key,
						fetch_primary_key_cols,
						index, table, i, num_v);
					if (!field) {
						if (innobase_is_v_fld(table->field[i])) {
							num_v++;
						}
						continue;
					}
				}

				templ = build_template_field(
					m_prebuilt, clust_index, index,
					table, field, i - num_v, num_v);

				if (templ->is_virtual) {
					num_v++;
				}
			}
		}

		m_prebuilt->idx_cond = this;
	} else {
		mysql_row_templ_t*	templ;
		ulint			num_v = 0;
		/* No index condition pushdown */
		m_prebuilt->idx_cond = NULL;

		for (i = 0; i < n_fields; i++) {
			const Field*	field;

			if (whole_row) {
				/* Even this is whole_row, if the seach is
				on a virtual column, and read_just_key is
				set, and field is not in this index, we
				will not try to fill the value since they
				are not stored in such index nor in the
				cluster index. */
				if (innobase_is_v_fld(table->field[i])
				    && m_prebuilt->read_just_key
				    && !dict_index_contains_col_or_prefix(
					m_prebuilt->index, num_v, true))
				{
					num_v++;
					continue;
				}

				field = table->field[i];
			} else {
				ibool	contain;

				if (innobase_is_v_fld(table->field[i])) {
					contain = dict_index_contains_col_or_prefix(
						index, num_v, true);
				} else {
					contain = dict_index_contains_col_or_prefix(
						index, i - num_v,
						false);
				}

				field = build_template_needs_field(
					contain,
					m_prebuilt->read_just_key,
					fetch_all_in_key,
					fetch_primary_key_cols,
					index, table, i, num_v);
				if (!field) {
					if (innobase_is_v_fld(table->field[i])) {
						num_v++;
					}
					continue;
				}
			}

			templ = build_template_field(
				m_prebuilt, clust_index, index,
				table, field, i - num_v, num_v);
			if (templ->is_virtual) {
				num_v++;
			}
		}
	}

	if (index != clust_index && m_prebuilt->need_to_access_clustered) {
		/* Change rec_field_no's to correspond to the clustered index
		record */
		for (i = 0; i < m_prebuilt->n_template; i++) {

			mysql_row_templ_t*	templ
				= &m_prebuilt->mysql_template[i];

			templ->rec_field_no = templ->clust_rec_field_no;
		}
	}
}

/********************************************************************//**
This special handling is really to overcome the limitations of MySQL's
binlogging. We need to eliminate the non-determinism that will arise in
INSERT ... SELECT type of statements, since MySQL binlog only stores the
min value of the autoinc interval. Once that is fixed we can get rid of
the special lock handling.
@return DB_SUCCESS if all OK else error code */

dberr_t
ha_innobase::innobase_lock_autoinc(void)
/*====================================*/
{
	dberr_t		error = DB_SUCCESS;
	long		lock_mode = innobase_autoinc_lock_mode;

	ut_ad(!srv_read_only_mode
	      || dict_table_is_intrinsic(m_prebuilt->table));

	if (dict_table_is_intrinsic(m_prebuilt->table)) {
		/* Intrinsic table are not shared accorss connection
		so there is no need to AUTOINC lock the table. */
		lock_mode = AUTOINC_NO_LOCKING;
	}

	switch (lock_mode) {
	case AUTOINC_NO_LOCKING:
		/* Acquire only the AUTOINC mutex. */
		dict_table_autoinc_lock(m_prebuilt->table);
		break;

	case AUTOINC_NEW_STYLE_LOCKING:
		/* For simple (single/multi) row INSERTs, we fallback to the
		old style only if another transaction has already acquired
		the AUTOINC lock on behalf of a LOAD FILE or INSERT ... SELECT
		etc. type of statement. */
		if (thd_sql_command(m_user_thd) == SQLCOM_INSERT
		    || thd_sql_command(m_user_thd) == SQLCOM_REPLACE) {

			dict_table_t*	ib_table = m_prebuilt->table;

			/* Acquire the AUTOINC mutex. */
			dict_table_autoinc_lock(ib_table);

			/* We need to check that another transaction isn't
			already holding the AUTOINC lock on the table. */
			if (ib_table->n_waiting_or_granted_auto_inc_locks) {
				/* Release the mutex to avoid deadlocks. */
				dict_table_autoinc_unlock(ib_table);
			} else {
				break;
			}
		}
		/* Fall through to old style locking. */

	case AUTOINC_OLD_STYLE_LOCKING:
		error = row_lock_table_autoinc_for_mysql(m_prebuilt);

		if (error == DB_SUCCESS) {

			/* Acquire the AUTOINC mutex. */
			dict_table_autoinc_lock(m_prebuilt->table);
		}
		break;

	default:
		ut_error;
	}

	return(error);
}

/********************************************************************//**
Store the autoinc value in the table. The autoinc value is only set if
it's greater than the existing autoinc value in the table.
@return DB_SUCCESS if all went well else error code */

dberr_t
ha_innobase::innobase_set_max_autoinc(
/*==================================*/
	ulonglong	auto_inc)	/*!< in: value to store */
{
	dberr_t		error;

	error = innobase_lock_autoinc();

	if (error == DB_SUCCESS) {

		dict_table_autoinc_update_if_greater(m_prebuilt->table, auto_inc);

		dict_table_autoinc_unlock(m_prebuilt->table);
	}

	return(error);
}

/** Write Row interface optimized for intrinisc table.
@param[in]	record	a row in MySQL format.
@return 0 on success or error code */
int
ha_innobase::intrinsic_table_write_row(uchar* record)
{
	dberr_t		err;

	/* No auto-increment support for intrinsic table. */
	ut_ad(!(table->next_number_field && record == table->record[0]));

	if (m_prebuilt->mysql_template == NULL
	    || m_prebuilt->template_type != ROW_MYSQL_WHOLE_ROW) {
		/* Build the template used in converting quickly between
		the two database formats */
		build_template(true);
	}

	err = row_insert_for_mysql((byte*) record, m_prebuilt);

	return(convert_error_code_to_mysql(
		err, m_prebuilt->table->flags, m_user_thd));
}

/********************************************************************//**
Stores a row in an InnoDB database, to the table specified in this
handle.
@return error code */

int
ha_innobase::write_row(
/*===================*/
	uchar*	record)	/*!< in: a row in MySQL format */
{
	dberr_t		error;
	ulint		sql_command;
	int		error_result = 0;
	bool		auto_inc_used = false;

	DBUG_ENTER("ha_innobase::write_row");

	if (dict_table_is_intrinsic(m_prebuilt->table)) {
		DBUG_RETURN(intrinsic_table_write_row(record));
	}

	trx_t*		trx = thd_to_trx(m_user_thd);
	TrxInInnoDB	trx_in_innodb(trx);

	if (!dict_table_is_intrinsic(m_prebuilt->table)
	    && trx_in_innodb.is_aborted()) {

		DBUG_RETURN(innobase_rollback(ht, m_user_thd, false));
	}

	/* Step-1: Validation checks before we commence write_row operation. */
	if (high_level_read_only) {
		ib_senderrf(ha_thd(), IB_LOG_LEVEL_WARN, ER_READ_ONLY_MODE);
		DBUG_RETURN(HA_ERR_TABLE_READONLY);
	} else if (m_prebuilt->trx != trx) {

		ib::error() << "The transaction object for the table handle is"
			" at " << static_cast<const void*>(m_prebuilt->trx)
			<< ", but for the current thread it is at "
			<< static_cast<const void*>(trx);

		fputs("InnoDB: Dump of 200 bytes around m_prebuilt: ", stderr);
		ut_print_buf(stderr, ((const byte*) m_prebuilt) - 100, 200);
		fputs("\nInnoDB: Dump of 200 bytes around ha_data: ", stderr);
		ut_print_buf(stderr, ((const byte*) trx) - 100, 200);
		putc('\n', stderr);
		ut_error;
	} else if (!trx_is_started(trx)) {
		++trx->will_lock;
	}

	ha_statistic_increment(&SSV::ha_write_count);

	/* Step-2: Intermediate commit if original operation involves ALTER
	table with algorithm = copy. Intermediate commit ease pressure on
	recovery if server crashes while ALTER is active. */
	sql_command = thd_sql_command(m_user_thd);

	if ((sql_command == SQLCOM_ALTER_TABLE
	     || sql_command == SQLCOM_OPTIMIZE
	     || sql_command == SQLCOM_CREATE_INDEX
	     || sql_command == SQLCOM_DROP_INDEX)
	    && m_num_write_row >= 10000) {
		/* ALTER TABLE is COMMITted at every 10000 copied rows.
		The IX table lock for the original table has to be re-issued.
		As this method will be called on a temporary table where the
		contents of the original table is being copied to, it is
		a bit tricky to determine the source table.  The cursor
		position in the source table need not be adjusted after the
		intermediate COMMIT, since writes by other transactions are
		being blocked by a MySQL table lock TL_WRITE_ALLOW_READ. */

		dict_table_t*	src_table;
		enum lock_mode	mode;

		m_num_write_row = 0;

		/* Commit the transaction.  This will release the table
		locks, so they have to be acquired again. */

		/* Altering an InnoDB table */
		/* Get the source table. */
		src_table = lock_get_src_table(
				m_prebuilt->trx, m_prebuilt->table, &mode);
		if (!src_table) {
no_commit:
			/* Unknown situation: do not commit */
			;
		} else if (src_table == m_prebuilt->table) {
			/* Source table is not in InnoDB format:
			no need to re-acquire locks on it. */

			/* Altering to InnoDB format */
			innobase_commit(ht, m_user_thd, 1);
			/* Note that this transaction is still active. */
			trx_register_for_2pc(m_prebuilt->trx);
			/* We will need an IX lock on the destination table. */
			m_prebuilt->sql_stat_start = TRUE;
		} else {
			/* Ensure that there are no other table locks than
			LOCK_IX and LOCK_AUTO_INC on the destination table. */

			if (!lock_is_table_exclusive(m_prebuilt->table,
							m_prebuilt->trx)) {
				goto no_commit;
			}

			/* Commit the transaction.  This will release the table
			locks, so they have to be acquired again. */
			innobase_commit(ht, m_user_thd, 1);
			/* Note that this transaction is still active. */
			trx_register_for_2pc(m_prebuilt->trx);
			/* Re-acquire the table lock on the source table. */
			row_lock_table_for_mysql(m_prebuilt, src_table, mode);
			/* We will need an IX lock on the destination table. */
			m_prebuilt->sql_stat_start = TRUE;
		}
	}

	m_num_write_row++;

	/* Step-3: Handling of Auto-Increment Columns. */
	if (table->next_number_field && record == table->record[0]) {

		/* Reset the error code before calling
		innobase_get_auto_increment(). */
		m_prebuilt->autoinc_error = DB_SUCCESS;

		if ((error_result = update_auto_increment())) {
			/* We don't want to mask autoinc overflow errors. */

			/* Handle the case where the AUTOINC sub-system
			failed during initialization. */
			if (m_prebuilt->autoinc_error == DB_UNSUPPORTED) {
				error_result = ER_AUTOINC_READ_FAILED;
				/* Set the error message to report too. */
				my_error(ER_AUTOINC_READ_FAILED, MYF(0));
				goto func_exit;
			} else if (m_prebuilt->autoinc_error != DB_SUCCESS) {
				error = m_prebuilt->autoinc_error;
				goto report_error;
			}

			/* MySQL errors are passed straight back. */
			goto func_exit;
		}

		auto_inc_used = true;
	}

	/* Step-4: Prepare INSERT graph that will be executed for actual INSERT
	(This is a one time operation) */
	if (m_prebuilt->mysql_template == NULL
	    || m_prebuilt->template_type != ROW_MYSQL_WHOLE_ROW) {

		/* Build the template used in converting quickly between
		the two database formats */

		build_template(true);
	}

	innobase_srv_conc_enter_innodb(m_prebuilt);

	/* Step-5: Execute insert graph that will result in actual insert. */
	error = row_insert_for_mysql((byte*) record, m_prebuilt);

	DEBUG_SYNC(m_user_thd, "ib_after_row_insert");

	if (UNIV_LIKELY(error == DB_SUCCESS)) {
		rows_changed++;
	}

	/* Step-6: Handling of errors related to auto-increment. */
	if (auto_inc_used) {
		ulonglong	auto_inc;
		ulonglong	col_max_value;

		/* Note the number of rows processed for this statement, used
		by get_auto_increment() to determine the number of AUTO-INC
		values to reserve. This is only useful for a mult-value INSERT
		and is a statement level counter. */
		if (trx->n_autoinc_rows > 0) {
			--trx->n_autoinc_rows;
		}

		/* We need the upper limit of the col type to check for
		whether we update the table autoinc counter or not. */
		col_max_value =
			table->next_number_field->get_max_int_value();

		/* Get the value that MySQL attempted to store in the table. */
		auto_inc = table->next_number_field->val_int();

		switch (error) {
		case DB_DUPLICATE_KEY:

			/* A REPLACE command and LOAD DATA INFILE REPLACE
			handle a duplicate key error themselves, but we
			must update the autoinc counter if we are performing
			those statements. */

			switch (sql_command) {
			case SQLCOM_LOAD:
				if (trx->duplicates) {

					goto set_max_autoinc;
				}
				break;

			case SQLCOM_REPLACE:
			case SQLCOM_INSERT_SELECT:
			case SQLCOM_REPLACE_SELECT:
				goto set_max_autoinc;

			default:
				break;
			}

			break;

		case DB_SUCCESS:
			/* If the actual value inserted is greater than
			the upper limit of the interval, then we try and
			update the table upper limit. Note: last_value
			will be 0 if get_auto_increment() was not called. */

			if (auto_inc >= m_prebuilt->autoinc_last_value) {
set_max_autoinc:
				/* This should filter out the negative
				values set explicitly by the user. */
				if (auto_inc <= col_max_value) {
					ut_a(m_prebuilt->autoinc_increment > 0);

					ulonglong	offset;
					ulonglong	increment;
					dberr_t		err;

					offset = m_prebuilt->autoinc_offset;
					increment = m_prebuilt->autoinc_increment;

					auto_inc = innobase_next_autoinc(
						auto_inc,
						1, increment, offset,
						col_max_value);

					err = innobase_set_max_autoinc(
						auto_inc);

					if (err != DB_SUCCESS) {
						error = err;
					}
				}
			}
			break;
		default:
			break;
		}
	}

	innobase_srv_conc_exit_innodb(m_prebuilt);

report_error:
	/* Step-7: Cleanup and exit. */
	if (error == DB_TABLESPACE_DELETED) {
		ib_senderrf(
			trx->mysql_thd, IB_LOG_LEVEL_ERROR,
			ER_TABLESPACE_DISCARDED,
			table->s->table_name.str);
	}

	error_result = convert_error_code_to_mysql(
		error, m_prebuilt->table->flags, m_user_thd);

	if (error_result == HA_FTS_INVALID_DOCID) {
		my_error(HA_FTS_INVALID_DOCID, MYF(0));
	}

func_exit:
	innobase_active_small();

	if (UNIV_UNLIKELY(m_share && m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	DBUG_RETURN(error_result);
}

/** Fill the update vector's "old_vrow" field for those non-updated,
but indexed columns. Such columns could stil present in the virtual
index rec fields even if they are not updated (some other fields updated),
so needs to be logged.
@param[in]	prebuilt		InnoDB prebuilt struct
@param[in,out]	vfield			field to filled
@param[in]	o_len			actual column length
@param[in,out]	col			column to be filled
@param[in]	old_mysql_row_col	MySQL old field ptr
@param[in]	col_pack_len		MySQL field col length
@param[in,out]	buf			buffer for a converted integer value
@return used buffer ptr from row_mysql_store_col_in_innobase_format() */
static
byte*
innodb_fill_old_vcol_val(
	row_prebuilt_t*	prebuilt,
	dfield_t*	vfield,
	ulint		o_len,
	dict_col_t*	col,
	const byte*	old_mysql_row_col,
	ulint		col_pack_len,
	byte*		buf)
{
	dict_col_copy_type(
		col, dfield_get_type(vfield));
	if (o_len != UNIV_SQL_NULL) {

		buf = row_mysql_store_col_in_innobase_format(
			vfield,
			buf,
			TRUE,
			old_mysql_row_col,
			col_pack_len,
			dict_table_is_comp(prebuilt->table));
	} else {
		dfield_set_null(vfield);
	}

	return(buf);
}

/**********************************************************************//**
Checks which fields have changed in a row and stores information
of them to an update vector.
@return DB_SUCCESS or error code */
static
dberr_t
calc_row_difference(
/*================*/
	upd_t*		uvect,		/*!< in/out: update vector */
	const uchar*	old_row,	/*!< in: old row in MySQL format */
	uchar*		new_row,	/*!< in: new row in MySQL format */
	TABLE*		table,		/*!< in: table in MySQL data
					dictionary */
	uchar*		upd_buff,	/*!< in: buffer to use */
	ulint		buff_len,	/*!< in: buffer length */
	row_prebuilt_t*	prebuilt,	/*!< in: InnoDB prebuilt struct */
	THD*		thd)		/*!< in: user thread */
{
	uchar*		original_upd_buff = upd_buff;
	Field*		field;
	enum_field_types field_mysql_type;
	uint		n_fields;
	ulint		o_len;
	ulint		n_len;
	ulint		col_pack_len;
	const byte*	new_mysql_row_col;
	const byte*	old_mysql_row_col;
	const byte*	o_ptr;
	const byte*	n_ptr;
	byte*		buf;
	upd_field_t*	ufield;
	ulint		col_type;
	ulint		n_changed = 0;
	dfield_t	dfield;
	dict_index_t*	clust_index;
	uint		i;
	ibool		changes_fts_column = FALSE;
	ibool		changes_fts_doc_col = FALSE;
	trx_t*          trx = thd_to_trx(thd);
	doc_id_t	doc_id = FTS_NULL_DOC_ID;
	ulint		num_v = 0;

	ut_ad(!srv_read_only_mode || dict_table_is_intrinsic(prebuilt->table));

	n_fields = table->s->fields;
	clust_index = dict_table_get_first_index(prebuilt->table);

	/* We use upd_buff to convert changed fields */
	buf = (byte*) upd_buff;

	for (i = 0; i < n_fields; i++) {
		field = table->field[i];
		bool		is_virtual = innobase_is_v_fld(field);
		dict_col_t*	col;

		if (is_virtual) {
			col = &prebuilt->table->v_cols[num_v].m_col;
		} else {
			col = &prebuilt->table->cols[i - num_v];
		}

		o_ptr = (const byte*) old_row + get_field_offset(table, field);
		n_ptr = (const byte*) new_row + get_field_offset(table, field);

		/* Use new_mysql_row_col and col_pack_len save the values */

		new_mysql_row_col = n_ptr;
		old_mysql_row_col = o_ptr;
		col_pack_len = field->pack_length();

		o_len = col_pack_len;
		n_len = col_pack_len;

		/* We use o_ptr and n_ptr to dig up the actual data for
		comparison. */

		field_mysql_type = field->type();

		col_type = col->mtype;

		switch (col_type) {

		case DATA_BLOB:
		case DATA_POINT:
		case DATA_VAR_POINT:
		case DATA_GEOMETRY:
			o_ptr = row_mysql_read_blob_ref(&o_len, o_ptr, o_len);
			n_ptr = row_mysql_read_blob_ref(&n_len, n_ptr, n_len);

			break;

		case DATA_VARCHAR:
		case DATA_BINARY:
		case DATA_VARMYSQL:
			if (field_mysql_type == MYSQL_TYPE_VARCHAR) {
				/* This is a >= 5.0.3 type true VARCHAR where
				the real payload data length is stored in
				1 or 2 bytes */

				o_ptr = row_mysql_read_true_varchar(
					&o_len, o_ptr,
					(ulint)
					(((Field_varstring*) field)->length_bytes));

				n_ptr = row_mysql_read_true_varchar(
					&n_len, n_ptr,
					(ulint)
					(((Field_varstring*) field)->length_bytes));
			}

			break;
		default:
			;
		}

		if (field_mysql_type == MYSQL_TYPE_LONGLONG
		    && prebuilt->table->fts
		    && innobase_strcasecmp(
			field->field_name, FTS_DOC_ID_COL_NAME) == 0) {
			doc_id = (doc_id_t) mach_read_from_n_little_endian(
				n_ptr, 8);
			if (doc_id == 0) {
				return(DB_FTS_INVALID_DOCID);
			}
		}

		if (field->real_maybe_null()) {
			if (field->is_null_in_record(old_row)) {
				o_len = UNIV_SQL_NULL;
			}

			if (field->is_null_in_record(new_row)) {
				n_len = UNIV_SQL_NULL;
			}
		}

		if (is_virtual) {
			/* If the virtual column is not indexed,
			we shall ignore it for update */
			if (!col->ord_part) {
			       num_v++;
			       continue;
			}

			if (!uvect->old_vrow) {
				uvect->old_vrow = dtuple_create_with_vcol(
					uvect->heap, 0, prebuilt->table->n_v_cols);
			}

			ulint   max_field_len = DICT_MAX_FIELD_LEN_BY_FORMAT(
						prebuilt->table);

			/* for virtual columns, we only materialize
			its index, and index field length would not
			exceed max_field_len. So continue if the
			first max_field_len bytes are matched up */
			if (o_len != UNIV_SQL_NULL
			   && n_len != UNIV_SQL_NULL
			   && o_len >= max_field_len
			   && n_len >= max_field_len
			   && memcmp(o_ptr, n_ptr, max_field_len) == 0) {
				dfield_t*	vfield = dtuple_get_nth_v_field(
					uvect->old_vrow, num_v);
				buf = innodb_fill_old_vcol_val(
					prebuilt, vfield, o_len,
					col, old_mysql_row_col,
					col_pack_len, buf);
			       num_v++;
			       continue;
			}
		}

		if (o_len != n_len || (o_len != UNIV_SQL_NULL &&
					0 != memcmp(o_ptr, n_ptr, o_len))) {
			/* The field has changed */

			ufield = uvect->fields + n_changed;
			UNIV_MEM_INVALID(ufield, sizeof *ufield);

			/* Let us use a dummy dfield to make the conversion
			from the MySQL column format to the InnoDB format */


			/* If the length of new geometry object is 0, means
			this object is invalid geometry object, we need
			to block it. */
			if (DATA_GEOMETRY_MTYPE(col_type)
			    && o_len != 0 && n_len == 0) {
				return(DB_CANT_CREATE_GEOMETRY_OBJECT);
			}

			if (n_len != UNIV_SQL_NULL) {
				dict_col_copy_type(
					col, dfield_get_type(&dfield));

				buf = row_mysql_store_col_in_innobase_format(
					&dfield,
					(byte*) buf,
					TRUE,
					new_mysql_row_col,
					col_pack_len,
					dict_table_is_comp(prebuilt->table));
				dfield_copy(&ufield->new_val, &dfield);
			} else {
				dict_col_copy_type(
					col, dfield_get_type(&ufield->new_val));
				dfield_set_null(&ufield->new_val);
			}

			ufield->exp = NULL;
			ufield->orig_len = 0;
			if (is_virtual) {
				dfield_t*	vfield = dtuple_get_nth_v_field(
					uvect->old_vrow, num_v);
				upd_fld_set_virtual_col(ufield);
				ufield->field_no = num_v;

				ut_ad(col->ord_part);
				ufield->old_v_val = static_cast<dfield_t*>(
					mem_heap_alloc(
						uvect->heap,
						sizeof *ufield->old_v_val));

				if (!field->is_null_in_record(old_row)) {
					if (n_len == UNIV_SQL_NULL) {
						dict_col_copy_type(
							col, dfield_get_type(
								&dfield));
					}

					buf = row_mysql_store_col_in_innobase_format(
						&dfield,
						(byte*) buf,
						TRUE,
						old_mysql_row_col,
						col_pack_len,
						dict_table_is_comp(
						prebuilt->table));
					dfield_copy(ufield->old_v_val,
						    &dfield);
					dfield_copy(vfield, &dfield);
				} else {
					dict_col_copy_type(
						col, dfield_get_type(
						ufield->old_v_val));
					dfield_set_null(ufield->old_v_val);
					dfield_set_null(vfield);
				}
				num_v++;
			} else {
				ufield->field_no = dict_col_get_clust_pos(
					&prebuilt->table->cols[i - num_v],
					clust_index);
				ufield->old_v_val = NULL;
			}
			n_changed++;

			/* If an FTS indexed column was changed by this
			UPDATE then we need to inform the FTS sub-system.

			NOTE: Currently we re-index all FTS indexed columns
			even if only a subset of the FTS indexed columns
			have been updated. That is the reason we are
			checking only once here. Later we will need to
			note which columns have been updated and do
			selective processing. */
			if (prebuilt->table->fts != NULL && !is_virtual) {
				ulint		offset;
				dict_table_t*   innodb_table;

				innodb_table = prebuilt->table;

				if (!changes_fts_column) {
					offset = row_upd_changes_fts_column(
						innodb_table, ufield);

					if (offset != ULINT_UNDEFINED) {
						changes_fts_column = TRUE;
					}
				}

				if (!changes_fts_doc_col) {
					changes_fts_doc_col =
					row_upd_changes_doc_id(
						innodb_table, ufield);
				}
			}
		} else if (is_virtual) {
			dfield_t*	vfield = dtuple_get_nth_v_field(
				uvect->old_vrow, num_v);
			buf = innodb_fill_old_vcol_val(
				prebuilt, vfield, o_len,
				col, old_mysql_row_col,
				col_pack_len, buf);
			ut_ad(col->ord_part);
			num_v++;
		}
	}

	/* If the update changes a column with an FTS index on it, we
	then add an update column node with a new document id to the
	other changes. We piggy back our changes on the normal UPDATE
	to reduce processing and IO overhead. */
	if (!prebuilt->table->fts) {
			trx->fts_next_doc_id = 0;
	} else if (changes_fts_column || changes_fts_doc_col) {
		dict_table_t*   innodb_table = prebuilt->table;

		ufield = uvect->fields + n_changed;

		if (!DICT_TF2_FLAG_IS_SET(
			innodb_table, DICT_TF2_FTS_HAS_DOC_ID)) {

			/* If Doc ID is managed by user, and if any
			FTS indexed column has been updated, its corresponding
			Doc ID must also be updated. Otherwise, return
			error */
			if (changes_fts_column && !changes_fts_doc_col) {
				ib::warn() << "A new Doc ID must be supplied"
					" while updating FTS indexed columns.";
				return(DB_FTS_INVALID_DOCID);
			}

			/* Doc ID must monotonically increase */
			ut_ad(innodb_table->fts->cache);
			if (doc_id < prebuilt->table->fts->cache->next_doc_id) {

				ib::warn() << "FTS Doc ID must be larger than "
					<< innodb_table->fts->cache->next_doc_id
					- 1  << " for table "
					<< innodb_table->name;

				return(DB_FTS_INVALID_DOCID);
			} else if ((doc_id
				    - prebuilt->table->fts->cache->next_doc_id)
				   >= FTS_DOC_ID_MAX_STEP) {

				ib::warn() << "Doc ID " << doc_id << " is too"
					" big. Its difference with largest"
					" Doc ID used " << prebuilt->table->fts
					->cache->next_doc_id - 1
					<< " cannot exceed or equal to "
					<< FTS_DOC_ID_MAX_STEP;
			}


			trx->fts_next_doc_id = doc_id;
		} else {
			/* If the Doc ID is a hidden column, it can't be
			changed by user */
			ut_ad(!changes_fts_doc_col);

			/* Doc ID column is hidden, a new Doc ID will be
			generated by following fts_update_doc_id() call */
			trx->fts_next_doc_id = 0;
		}

		fts_update_doc_id(
			innodb_table, ufield, &trx->fts_next_doc_id);

		++n_changed;
	} else {
		/* We have a Doc ID column, but none of FTS indexed
		columns are touched, nor the Doc ID column, so set
		fts_next_doc_id to UINT64_UNDEFINED, which means do not
		update the Doc ID column */
		trx->fts_next_doc_id = UINT64_UNDEFINED;
	}

	uvect->n_fields = n_changed;
	uvect->info_bits = 0;

	ut_a(buf <= (byte*) original_upd_buff + buff_len);

        ut_ad(uvect->validate());
	return(DB_SUCCESS);
}

/**
Updates a row given as a parameter to a new value. Note that we are given
whole rows, not just the fields which are updated: this incurs some
overhead for CPU when we check which fields are actually updated.
TODO: currently InnoDB does not prevent the 'Halloween problem':
in a searched update a single row can get updated several times
if its index columns are updated!
@param[in] old_row	Old row contents in MySQL format
@param[out] new_row	Updated row contents in MySQL format
@return error number or 0 */

int
ha_innobase::update_row(
	const uchar*	old_row,
	uchar*		new_row)
{
	int		err;

	dberr_t		error;
	trx_t*		trx = thd_to_trx(m_user_thd);

	DBUG_ENTER("ha_innobase::update_row");

	ut_a(m_prebuilt->trx == trx);

	if (high_level_read_only && !dict_table_is_intrinsic(m_prebuilt->table)) {
		ib_senderrf(ha_thd(), IB_LOG_LEVEL_WARN, ER_READ_ONLY_MODE);
		DBUG_RETURN(HA_ERR_TABLE_READONLY);
	} else if (!trx_is_started(trx)) {
		++trx->will_lock;
	}

	if (m_upd_buf == NULL) {
		ut_ad(m_upd_buf_size == 0);

		/* Create a buffer for packing the fields of a record. Why
		table->reclength did not work here? Obviously, because char
		fields when packed actually became 1 byte longer, when we also
		stored the string length as the first byte. */

		m_upd_buf_size = table->s->reclength + table->s->max_key_length
			+ MAX_REF_PARTS * 3;

		m_upd_buf = reinterpret_cast<uchar*>(
			my_malloc(
				PSI_INSTRUMENT_ME, m_upd_buf_size,
				MYF(MY_WME)));

		if (m_upd_buf == NULL) {
			m_upd_buf_size = 0;
			DBUG_RETURN(HA_ERR_OUT_OF_MEM);
		}
	}

	ha_statistic_increment(&SSV::ha_update_count);

	if (UNIV_UNLIKELY(m_share && m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	upd_t*		uvect;

	if (m_prebuilt->upd_node) {
		uvect = m_prebuilt->upd_node->update;
	} else {
		uvect = row_get_prebuilt_update_vector(m_prebuilt);
	}

	/* Build an update vector from the modified fields in the rows
	(uses m_upd_buf of the handle) */

	error = calc_row_difference(
		uvect, old_row, new_row, table, m_upd_buf, m_upd_buf_size,
		m_prebuilt, m_user_thd);

	if (error != DB_SUCCESS) {
		goto func_exit;
	}

	if (!dict_table_is_intrinsic(m_prebuilt->table)
	    && TrxInInnoDB::is_aborted(trx)) {

		DBUG_RETURN(innobase_rollback(ht, m_user_thd, false));
	}

	/* This is not a delete */
	m_prebuilt->upd_node->is_delete = FALSE;

	innobase_srv_conc_enter_innodb(m_prebuilt);

	error = row_update_for_mysql((byte*) old_row, m_prebuilt);

	/* We need to do some special AUTOINC handling for the following case:

	INSERT INTO t (c1,c2) VALUES(x,y) ON DUPLICATE KEY UPDATE ...

	We need to use the AUTOINC counter that was actually used by
	MySQL in the UPDATE statement, which can be different from the
	value used in the INSERT statement. */

	if (error == DB_SUCCESS
	    && table->next_number_field
	    && new_row == table->record[0]
	    && thd_sql_command(m_user_thd) == SQLCOM_INSERT
	    && trx->duplicates)  {

		ulonglong	auto_inc;
		ulonglong	col_max_value;

		auto_inc = table->next_number_field->val_int();

		/* We need the upper limit of the col type to check for
		whether we update the table autoinc counter or not. */
		col_max_value =
			table->next_number_field->get_max_int_value();

		if (auto_inc <= col_max_value && auto_inc != 0) {

			ulonglong	offset;
			ulonglong	increment;

			offset = m_prebuilt->autoinc_offset;
			increment = m_prebuilt->autoinc_increment;

			auto_inc = innobase_next_autoinc(
				auto_inc, 1, increment, offset, col_max_value);

			error = innobase_set_max_autoinc(auto_inc);
		}
	}

	if (UNIV_LIKELY(error == DB_SUCCESS)) {
	    rows_changed++;
	}

	innobase_srv_conc_exit_innodb(m_prebuilt);

func_exit:

	err = convert_error_code_to_mysql(
		error, m_prebuilt->table->flags, m_user_thd);

	/* If success and no columns were updated. */
	if (err == 0 && uvect->n_fields == 0) {

		/* This is the same as success, but instructs
		MySQL that the row is not really updated and it
		should not increase the count of updated rows.
		This is fix for http://bugs.mysql.com/29157 */
		err = HA_ERR_RECORD_IS_THE_SAME;
	} else if (err == HA_FTS_INVALID_DOCID) {
		my_error(HA_FTS_INVALID_DOCID, MYF(0));
	}

	/* Tell InnoDB server that there might be work for
	utility threads: */

	innobase_active_small();

	if (UNIV_UNLIKELY(m_share && m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	DBUG_RETURN(err);
}

/**********************************************************************//**
Deletes a row given as the parameter.
@return error number or 0 */

int
ha_innobase::delete_row(
/*====================*/
	const uchar*	record)	/*!< in: a row in MySQL format */
{
	dberr_t		error;
	trx_t*		trx = thd_to_trx(m_user_thd);
	TrxInInnoDB	trx_in_innodb(trx);

	DBUG_ENTER("ha_innobase::delete_row");

	if (!dict_table_is_intrinsic(m_prebuilt->table)
	    && trx_in_innodb.is_aborted()) {

		DBUG_RETURN(innobase_rollback(ht, m_user_thd, false));
	}

	ut_a(m_prebuilt->trx == trx);

	if (high_level_read_only && !dict_table_is_intrinsic(m_prebuilt->table)) {
		ib_senderrf(ha_thd(), IB_LOG_LEVEL_WARN, ER_READ_ONLY_MODE);
		DBUG_RETURN(HA_ERR_TABLE_READONLY);
	} else if (!trx_is_started(trx)) {
		++trx->will_lock;
	}

	ha_statistic_increment(&SSV::ha_delete_count);

	if (UNIV_UNLIKELY(m_share && m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	if (!m_prebuilt->upd_node) {
		row_get_prebuilt_update_vector(m_prebuilt);
	}

	/* This is a delete */

	m_prebuilt->upd_node->is_delete = TRUE;

	innobase_srv_conc_enter_innodb(m_prebuilt);

	error = row_update_for_mysql((byte*) record, m_prebuilt);

	if (UNIV_LIKELY(error == DB_SUCCESS)) {
		rows_changed++;
	}

	innobase_srv_conc_exit_innodb(m_prebuilt);

	/* Tell the InnoDB server that there might be work for
	utility threads: */

	innobase_active_small();

	if (UNIV_UNLIKELY(m_share && m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	DBUG_RETURN(convert_error_code_to_mysql(
			    error, m_prebuilt->table->flags, m_user_thd));
}

/** Delete all rows from the table.
@return error number or 0 */

int
ha_innobase::delete_all_rows()
{
	DBUG_ENTER("ha_innobase::delete_all_rows");

	/* Currently enabled only for intrinsic tables. */
	if (!dict_table_is_intrinsic(m_prebuilt->table)) {
		DBUG_RETURN(HA_ERR_WRONG_COMMAND);
	}

	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	if (!dict_table_is_intrinsic(m_prebuilt->table)
	    && trx_in_innodb.is_aborted()) {

		DBUG_RETURN(innobase_rollback(ht, m_user_thd, false));
	}

	dberr_t	error = row_delete_all_rows(m_prebuilt->table);

	if (error == DB_SUCCESS) {
		dict_stats_update(m_prebuilt->table, DICT_STATS_EMPTY_TABLE);
	}

	DBUG_RETURN(convert_error_code_to_mysql(
			    error, m_prebuilt->table->flags, m_user_thd));
}

/**********************************************************************//**
Removes a new lock set on a row, if it was not read optimistically. This can
be called after a row has been read in the processing of an UPDATE or a DELETE
query, if the option innodb_locks_unsafe_for_binlog is set. */

void
ha_innobase::unlock_row(void)
/*=========================*/
{
	DBUG_ENTER("ha_innobase::unlock_row");

	/* Consistent read does not take any locks, thus there is
	nothing to unlock.  There is no locking for intrinsic table. */

	if (m_prebuilt->select_lock_type == LOCK_NONE
	    || dict_table_is_intrinsic(m_prebuilt->table)) {
		DBUG_VOID_RETURN;
	}

	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	if (trx_in_innodb.is_aborted()) {
		DBUG_VOID_RETURN;
	}

	ut_ad(!dict_table_is_intrinsic(m_prebuilt->table));

	/* Ideally, this assert must be in the beginning of the function.
	But there are some calls to this function from the SQL layer when the
	transaction is in state TRX_STATE_NOT_STARTED.  The check on
	m_prebuilt->select_lock_type above gets around this issue. */

	ut_ad(trx_state_eq(m_prebuilt->trx, TRX_STATE_ACTIVE)
	      || trx_state_eq(m_prebuilt->trx, TRX_STATE_FORCED_ROLLBACK));

	switch (m_prebuilt->row_read_type) {
	case ROW_READ_WITH_LOCKS:
		if (!srv_locks_unsafe_for_binlog
		    && m_prebuilt->trx->isolation_level
		    > TRX_ISO_READ_COMMITTED) {
			break;
		}
		/* fall through */
	case ROW_READ_TRY_SEMI_CONSISTENT:
		row_unlock_for_mysql(m_prebuilt, FALSE);
		break;
	case ROW_READ_DID_SEMI_CONSISTENT:
		m_prebuilt->row_read_type = ROW_READ_TRY_SEMI_CONSISTENT;
		break;
	}

	DBUG_VOID_RETURN;
}

/* See handler.h and row0mysql.h for docs on this function. */

bool
ha_innobase::was_semi_consistent_read(void)
/*=======================================*/
{
	return(m_prebuilt->row_read_type == ROW_READ_DID_SEMI_CONSISTENT);
}

/* See handler.h and row0mysql.h for docs on this function. */

void
ha_innobase::try_semi_consistent_read(bool yes)
/*===========================================*/
{
	ut_a(m_prebuilt->trx == thd_to_trx(ha_thd()));

	/* Row read type is set to semi consistent read if this was
	requested by the MySQL and either innodb_locks_unsafe_for_binlog
	option is used or this session is using READ COMMITTED isolation
	level. */

	if (yes
	    && (srv_locks_unsafe_for_binlog
		|| m_prebuilt->trx->isolation_level
		<= TRX_ISO_READ_COMMITTED)) {

		m_prebuilt->row_read_type = ROW_READ_TRY_SEMI_CONSISTENT;

	} else {
		m_prebuilt->row_read_type = ROW_READ_WITH_LOCKS;
	}
}

/******************************************************************//**
Initializes a handle to use an index.
@return 0 or error number */

int
ha_innobase::index_init(
/*====================*/
	uint		keynr,	/*!< in: key (index) number */
	bool		sorted)	/*!< in: 1 if result MUST be sorted
				according to index */
{
	DBUG_ENTER("index_init");

	DBUG_RETURN(change_active_index(keynr));
}

/******************************************************************//**
Currently does nothing.
@return 0 */

int
ha_innobase::index_end(void)
/*========================*/
{
	DBUG_ENTER("index_end");

	m_prebuilt->index->last_sel_cur->release();

	active_index = MAX_KEY;

	in_range_check_pushed_down = FALSE;

	m_ds_mrr.dsmrr_close();

	DBUG_RETURN(0);
}

/*********************************************************************//**
Converts a search mode flag understood by MySQL to a flag understood
by InnoDB. */
page_cur_mode_t
convert_search_mode_to_innobase(
/*============================*/
	ha_rkey_function	find_flag)
{
	switch (find_flag) {
	case HA_READ_KEY_EXACT:
		/* this does not require the index to be UNIQUE */
	case HA_READ_KEY_OR_NEXT:
		return(PAGE_CUR_GE);
	case HA_READ_AFTER_KEY:
		return(PAGE_CUR_G);
	case HA_READ_BEFORE_KEY:
		return(PAGE_CUR_L);
	case HA_READ_KEY_OR_PREV:
	case HA_READ_PREFIX_LAST:
	case HA_READ_PREFIX_LAST_OR_PREV:
		return(PAGE_CUR_LE);
	case HA_READ_MBR_CONTAIN:
		return(PAGE_CUR_CONTAIN);
	case HA_READ_MBR_INTERSECT:
		return(PAGE_CUR_INTERSECT);
	case HA_READ_MBR_WITHIN:
		return(PAGE_CUR_WITHIN);
	case HA_READ_MBR_DISJOINT:
		return(PAGE_CUR_DISJOINT);
	case HA_READ_MBR_EQUAL:
		return(PAGE_CUR_MBR_EQUAL);
	case HA_READ_PREFIX:
		return(PAGE_CUR_UNSUPP);
        case HA_READ_INVALID:
		return(PAGE_CUR_UNSUPP);
	/* do not use "default:" in order to produce a gcc warning:
	enumeration value '...' not handled in switch
	(if -Wswitch or -Wall is used) */
	}

	my_error(ER_CHECK_NOT_IMPLEMENTED, MYF(0), "this functionality");

	return(PAGE_CUR_UNSUPP);
}

/*
   BACKGROUND INFO: HOW A SELECT SQL QUERY IS EXECUTED
   ---------------------------------------------------
The following does not cover all the details, but explains how we determine
the start of a new SQL statement, and what is associated with it.

For each table in the database the MySQL interpreter may have several
table handle instances in use, also in a single SQL query. For each table
handle instance there is an InnoDB  'm_prebuilt' struct which contains most
of the InnoDB data associated with this table handle instance.

  A) if the user has not explicitly set any MySQL table level locks:

  1) MySQL calls ::external_lock to set an 'intention' table level lock on
the table of the handle instance. There we set
m_prebuilt->sql_stat_start = TRUE. The flag sql_stat_start should be set
true if we are taking this table handle instance to use in a new SQL
statement issued by the user. We also increment trx->n_mysql_tables_in_use.

  2) If m_prebuilt->sql_stat_start == TRUE we 'pre-compile' the MySQL search
instructions to m_prebuilt->template of the table handle instance in
::index_read. The template is used to save CPU time in large joins.

  3) In row_search_for_mysql, if m_prebuilt->sql_stat_start is true, we
allocate a new consistent read view for the trx if it does not yet have one,
or in the case of a locking read, set an InnoDB 'intention' table level
lock on the table.

  4) We do the SELECT. MySQL may repeatedly call ::index_read for the
same table handle instance, if it is a join.

  5) When the SELECT ends, MySQL removes its intention table level locks
in ::external_lock. When trx->n_mysql_tables_in_use drops to zero,
 (a) we execute a COMMIT there if the autocommit is on,
 (b) we also release possible 'SQL statement level resources' InnoDB may
have for this SQL statement. The MySQL interpreter does NOT execute
autocommit for pure read transactions, though it should. That is why the
table handler in that case has to execute the COMMIT in ::external_lock.

  B) If the user has explicitly set MySQL table level locks, then MySQL
does NOT call ::external_lock at the start of the statement. To determine
when we are at the start of a new SQL statement we at the start of
::index_read also compare the query id to the latest query id where the
table handle instance was used. If it has changed, we know we are at the
start of a new SQL statement. Since the query id can theoretically
overwrap, we use this test only as a secondary way of determining the
start of a new SQL statement. */


/**********************************************************************//**
Positions an index cursor to the index specified in the handle. Fetches the
row if any.
@return 0, HA_ERR_KEY_NOT_FOUND, or error number */

int
ha_innobase::index_read(
/*====================*/
	uchar*		buf,		/*!< in/out: buffer for the returned
					row */
	const uchar*	key_ptr,	/*!< in: key value; if this is NULL
					we position the cursor at the
					start or end of index; this can
					also contain an InnoDB row id, in
					which case key_len is the InnoDB
					row id length; the key value can
					also be a prefix of a full key value,
					and the last column can be a prefix
					of a full column */
	uint			key_len,/*!< in: key value length */
	enum ha_rkey_function find_flag)/*!< in: search flags from my_base.h */
{
	DBUG_ENTER("index_read");
	DEBUG_SYNC_C("ha_innobase_index_read_begin");

	ut_a(m_prebuilt->trx == thd_to_trx(m_user_thd));
	ut_ad(key_len != 0 || find_flag != HA_READ_KEY_EXACT);

	ha_statistic_increment(&SSV::ha_read_key_count);

	if (UNIV_UNLIKELY(srv_pass_corrupt_table <= 1 && m_share
			  && m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	dict_index_t*	index = m_prebuilt->index;

	if (index == NULL || dict_index_is_corrupted(index)) {
		m_prebuilt->index_usable = FALSE;
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	if (!m_prebuilt->index_usable) {
		DBUG_RETURN(dict_index_is_corrupted(index)
			    ? HA_ERR_INDEX_CORRUPT
			    : HA_ERR_TABLE_DEF_CHANGED);
	}

	if (index->type & DICT_FTS) {
		DBUG_RETURN(HA_ERR_KEY_NOT_FOUND);
	}

	/* For R-Tree index, we will always place the page lock to
	pages being searched */
	if (dict_index_is_spatial(index)) {
		++m_prebuilt->trx->will_lock;
	}

	/* Note that if the index for which the search template is built is not
	necessarily m_prebuilt->index, but can also be the clustered index */

	if (m_prebuilt->sql_stat_start) {
		build_template(false);
	}

	if (key_ptr != NULL) {
		/* Convert the search key value to InnoDB format into
		m_prebuilt->search_tuple */

		row_sel_convert_mysql_key_to_innobase(
			m_prebuilt->search_tuple,
			m_prebuilt->srch_key_val1,
			m_prebuilt->srch_key_val_len,
			index,
			(byte*) key_ptr,
			(ulint) key_len,
			m_prebuilt->trx);

		DBUG_ASSERT(m_prebuilt->search_tuple->n_fields > 0);
	} else {
		/* We position the cursor to the last or the first entry
		in the index */

		dtuple_set_n_fields(m_prebuilt->search_tuple, 0);
	}

	page_cur_mode_t	mode = convert_search_mode_to_innobase(find_flag);

	ulint	match_mode = 0;

	if (find_flag == HA_READ_KEY_EXACT) {

		match_mode = ROW_SEL_EXACT;

	} else if (find_flag == HA_READ_PREFIX_LAST) {

		match_mode = ROW_SEL_EXACT_PREFIX;
	}

	m_last_match_mode = (uint) match_mode;

	dberr_t		ret;

	if (mode != PAGE_CUR_UNSUPP) {

		innobase_srv_conc_enter_innodb(m_prebuilt);

		if (!dict_table_is_intrinsic(m_prebuilt->table)) {

			if (TrxInInnoDB::is_aborted(m_prebuilt->trx)) {

				DBUG_RETURN(innobase_rollback(
						ht, m_user_thd, false));
			}

			m_prebuilt->ins_sel_stmt = thd_is_ins_sel_stmt(
				m_user_thd);

			ret = row_search_mvcc(
				buf, mode, m_prebuilt, match_mode, 0);

		} else {
			m_prebuilt->session = thd_to_innodb_session(m_user_thd);

			ret = row_search_no_mvcc(
				buf, mode, m_prebuilt, match_mode, 0);
		}

		innobase_srv_conc_exit_innodb(m_prebuilt);
	} else {

		ret = DB_UNSUPPORTED;
	}

	if (UNIV_UNLIKELY(srv_pass_corrupt_table <= 1 && m_share
			  && m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	DBUG_EXECUTE_IF("ib_select_query_failure", ret = DB_ERROR;);

	int	error;

	switch (ret) {
	case DB_SUCCESS:
		error = 0;
		table->status = 0;
		srv_stats.n_rows_read.add(
			thd_get_thread_id(m_prebuilt->trx->mysql_thd), 1);
		rows_read++;
		if (active_index < MAX_KEY)
			index_rows_read[active_index]++;
		break;

	case DB_RECORD_NOT_FOUND:
		error = HA_ERR_KEY_NOT_FOUND;
		table->status = STATUS_NOT_FOUND;
		break;

	case DB_END_OF_INDEX:
		error = HA_ERR_KEY_NOT_FOUND;
		table->status = STATUS_NOT_FOUND;
		break;

	case DB_TABLESPACE_DELETED:
		ib_senderrf(
			m_prebuilt->trx->mysql_thd, IB_LOG_LEVEL_ERROR,
			ER_TABLESPACE_DISCARDED,
			table->s->table_name.str);

		table->status = STATUS_NOT_FOUND;
		error = HA_ERR_NO_SUCH_TABLE;
		break;

	case DB_TABLESPACE_NOT_FOUND:

		ib_senderrf(
			m_prebuilt->trx->mysql_thd, IB_LOG_LEVEL_ERROR,
			ER_TABLESPACE_MISSING,
			table->s->table_name.str);

		table->status = STATUS_NOT_FOUND;
		error = HA_ERR_TABLESPACE_MISSING;
		break;

	default:
		error = convert_error_code_to_mysql(
			ret, m_prebuilt->table->flags, m_user_thd);

		table->status = STATUS_NOT_FOUND;
		break;
	}

	DBUG_RETURN(error);
}

/*******************************************************************//**
The following functions works like index_read, but it find the last
row with the current key value or prefix.
@return 0, HA_ERR_KEY_NOT_FOUND, or an error code */

int
ha_innobase::index_read_last(
/*=========================*/
	uchar*		buf,	/*!< out: fetched row */
	const uchar*	key_ptr,/*!< in: key value, or a prefix of a full
				key value */
	uint		key_len)/*!< in: length of the key val or prefix
				in bytes */
{
	return(index_read(buf, key_ptr, key_len, HA_READ_PREFIX_LAST));
}

/********************************************************************//**
Get the index for a handle. Does not change active index.
@return NULL or index instance. */

dict_index_t*
ha_innobase::innobase_get_index(
/*============================*/
	uint		keynr)	/*!< in: use this index; MAX_KEY means always
				clustered index, even if it was internally
				generated by InnoDB */
{
	KEY*		key;
	dict_index_t*	index;

	DBUG_ENTER("innobase_get_index");

	if (keynr != MAX_KEY && table->s->keys > 0) {

		key = table->key_info + keynr;

		index = innobase_index_lookup(m_share, keynr);

		if (index != NULL) {
			ut_a(ut_strcmp(index->name, key->name) == 0);
		} else {
			/* Can't find index with keynr in the translation
			table. Only print message if the index translation
			table exists */
			if (m_share->idx_trans_tbl.index_mapping != NULL) {
				sql_print_warning("InnoDB could not find"
						  " index %s key no %u for"
						  " table %s through its"
						  " index translation table",
						  key ? key->name : "NULL",
						  keynr,
						  m_prebuilt->table->name
						  .m_name);
			}

			index = dict_table_get_index_on_name(
				m_prebuilt->table, key->name);
		}
	} else {
		key = 0;
		index = dict_table_get_first_index(m_prebuilt->table);
	}

	if (index == NULL) {
		sql_print_error(
			"InnoDB could not find key no %u with name %s"
			" from dict cache for table %s",
			keynr, key ? key->name : "NULL",
			m_prebuilt->table->name.m_name);
	}

	DBUG_RETURN(index);
}

/********************************************************************//**
Changes the active index of a handle.
@return 0 or error code */

int
ha_innobase::change_active_index(
/*=============================*/
	uint	keynr)	/*!< in: use this index; MAX_KEY means always clustered
			index, even if it was internally generated by
			InnoDB */
{
	DBUG_ENTER("change_active_index");

	if (UNIV_UNLIKELY(srv_pass_corrupt_table <= 1 && m_share
			  && m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	ut_ad(m_user_thd == ha_thd());
	ut_a(m_prebuilt->trx == thd_to_trx(m_user_thd));

	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	if (!dict_table_is_intrinsic(m_prebuilt->table)
	    && trx_in_innodb.is_aborted()) {

		DBUG_RETURN(innobase_rollback(ht, m_user_thd, false));
	}

	active_index = keynr;

	m_prebuilt->index = innobase_get_index(keynr);

	if (m_prebuilt->index == NULL) {
		sql_print_warning("InnoDB: change_active_index(%u) failed",
				  keynr);
		m_prebuilt->index_usable = FALSE;
		DBUG_RETURN(1);
	}

	m_prebuilt->index_usable = row_merge_is_index_usable(
		m_prebuilt->trx, m_prebuilt->index);

	if (!m_prebuilt->index_usable) {
		if (dict_index_is_corrupted(m_prebuilt->index)) {
			char	table_name[MAX_FULL_NAME_LEN + 1];

			innobase_format_name(
				table_name, sizeof table_name,
				m_prebuilt->index->table->name.m_name);

			if (dict_index_is_clust(m_prebuilt->index)) {
				ut_ad(m_prebuilt->index->table->corrupted);
				push_warning_printf(
					m_user_thd, Sql_condition::SL_WARNING,
					HA_ERR_TABLE_CORRUPT,
					"InnoDB: Table %s is corrupted.",
					table_name);
				DBUG_RETURN(HA_ERR_TABLE_CORRUPT);
			} else {
				push_warning_printf(
					m_user_thd, Sql_condition::SL_WARNING,
					HA_ERR_INDEX_CORRUPT,
					"InnoDB: Index %s for table %s is"
					" marked as corrupted",
					m_prebuilt->index->name(),
					table_name);
				DBUG_RETURN(HA_ERR_INDEX_CORRUPT);
			}
		} else {
			push_warning_printf(
				m_user_thd, Sql_condition::SL_WARNING,
				HA_ERR_TABLE_DEF_CHANGED,
				"InnoDB: insufficient history for index %u",
				keynr);
		}

		/* The caller seems to ignore this.  Thus, we must check
		this again in row_search_for_mysql(). */
		DBUG_RETURN(HA_ERR_TABLE_DEF_CHANGED);
	}

	ut_a(m_prebuilt->search_tuple != 0);

	/* Initialization of search_tuple is not needed for FT index
	since FT search returns rank only. In addition engine should
	be able to retrieve FTS_DOC_ID column value if necessary. */
	if ((m_prebuilt->index->type & DICT_FTS)) {
		if (table->fts_doc_id_field
		    && bitmap_is_set(table->read_set,
				     table->fts_doc_id_field->field_index
				     && m_prebuilt->read_just_key)) {
			m_prebuilt->fts_doc_id_in_read_set = 1;
		}
	} else {
		dtuple_set_n_fields(m_prebuilt->search_tuple,
				    m_prebuilt->index->n_fields);

		dict_index_copy_types(
			m_prebuilt->search_tuple, m_prebuilt->index,
			m_prebuilt->index->n_fields);

		/* If it's FTS query and FTS_DOC_ID exists FTS_DOC_ID field is
		always added to read_set. */
		m_prebuilt->fts_doc_id_in_read_set =
			(m_prebuilt->read_just_key && table->fts_doc_id_field
			 && m_prebuilt->in_fts_query);
	}

	/* MySQL changes the active index for a handle also during some
	queries, for example SELECT MAX(a), SUM(a) first retrieves the MAX()
	and then calculates the sum. Previously we played safe and used
	the flag ROW_MYSQL_WHOLE_ROW below, but that caused unnecessary
	copying. Starting from MySQL-4.1 we use a more efficient flag here. */

	build_template(false);

	DBUG_RETURN(0);
}

/***********************************************************************//**
Reads the next or previous row from a cursor, which must have previously been
positioned using index_read.
@return 0, HA_ERR_END_OF_FILE, or error number */

int
ha_innobase::general_fetch(
/*=======================*/
	uchar*	buf,		/*!< in/out: buffer for next row in MySQL
				format */
	uint	direction,	/*!< in: ROW_SEL_NEXT or ROW_SEL_PREV */
	uint	match_mode)	/*!< in: 0, ROW_SEL_EXACT, or
				ROW_SEL_EXACT_PREFIX */
{
	DBUG_ENTER("general_fetch");

	if (UNIV_UNLIKELY(srv_pass_corrupt_table <= 1 && m_share
			  && m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	const trx_t*	trx = m_prebuilt->trx;

	ut_ad(trx == thd_to_trx(m_user_thd));

	bool	intrinsic = dict_table_is_intrinsic(m_prebuilt->table);

	if (!intrinsic && TrxInInnoDB::is_aborted(trx)) {

		DBUG_RETURN(innobase_rollback(ht, m_user_thd, false));
	}

	innobase_srv_conc_enter_innodb(m_prebuilt);

	dberr_t	ret;

	if (!intrinsic) {

		ret = row_search_mvcc(
			buf, PAGE_CUR_UNSUPP, m_prebuilt, match_mode,
			direction);

	} else {
		ret = row_search_no_mvcc(
			buf, PAGE_CUR_UNSUPP, m_prebuilt, match_mode,
			direction);
	}

	innobase_srv_conc_exit_innodb(m_prebuilt);

	int	error;

	if (UNIV_UNLIKELY(srv_pass_corrupt_table <= 1 && m_share
			  && m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	switch (ret) {
	case DB_SUCCESS:
		error = 0;
		table->status = 0;
		srv_stats.n_rows_read.add(thd_get_thread_id(trx->mysql_thd), 1);
		rows_read++;
		if (active_index < MAX_KEY)
			index_rows_read[active_index]++;
		break;
	case DB_RECORD_NOT_FOUND:
		error = HA_ERR_END_OF_FILE;
		table->status = STATUS_NOT_FOUND;
		break;
	case DB_END_OF_INDEX:
		error = HA_ERR_END_OF_FILE;
		table->status = STATUS_NOT_FOUND;
		break;
	case DB_TABLESPACE_DELETED:
		ib_senderrf(
			trx->mysql_thd, IB_LOG_LEVEL_ERROR,
			ER_TABLESPACE_DISCARDED,
			table->s->table_name.str);

		table->status = STATUS_NOT_FOUND;
		error = HA_ERR_NO_SUCH_TABLE;
		break;
	case DB_TABLESPACE_NOT_FOUND:

		ib_senderrf(
			trx->mysql_thd, IB_LOG_LEVEL_ERROR,
			ER_TABLESPACE_MISSING,
			table->s->table_name.str);

		table->status = STATUS_NOT_FOUND;
		error = HA_ERR_TABLESPACE_MISSING;
		break;
	default:
		error = convert_error_code_to_mysql(
			ret, m_prebuilt->table->flags, m_user_thd);

		table->status = STATUS_NOT_FOUND;
		break;
	}

	DBUG_RETURN(error);
}

/***********************************************************************//**
Reads the next row from a cursor, which must have previously been
positioned using index_read.
@return 0, HA_ERR_END_OF_FILE, or error number */

int
ha_innobase::index_next(
/*====================*/
	uchar*		buf)	/*!< in/out: buffer for next row in MySQL
				format */
{
	ha_statistic_increment(&SSV::ha_read_next_count);

	return(general_fetch(buf, ROW_SEL_NEXT, 0));
}

/*******************************************************************//**
Reads the next row matching to the key value given as the parameter.
@return 0, HA_ERR_END_OF_FILE, or error number */

int
ha_innobase::index_next_same(
/*=========================*/
	uchar*		buf,	/*!< in/out: buffer for the row */
	const uchar*	key,	/*!< in: key value */
	uint		keylen)	/*!< in: key value length */
{
	ha_statistic_increment(&SSV::ha_read_next_count);

	return(general_fetch(buf, ROW_SEL_NEXT, m_last_match_mode));
}

/***********************************************************************//**
Reads the previous row from a cursor, which must have previously been
positioned using index_read.
@return 0, HA_ERR_END_OF_FILE, or error number */

int
ha_innobase::index_prev(
/*====================*/
	uchar*	buf)	/*!< in/out: buffer for previous row in MySQL format */
{
	ha_statistic_increment(&SSV::ha_read_prev_count);

	return(general_fetch(buf, ROW_SEL_PREV, 0));
}

/********************************************************************//**
Positions a cursor on the first record in an index and reads the
corresponding row to buf.
@return 0, HA_ERR_END_OF_FILE, or error code */

int
ha_innobase::index_first(
/*=====================*/
	uchar*	buf)	/*!< in/out: buffer for the row */
{
	DBUG_ENTER("index_first");

	ha_statistic_increment(&SSV::ha_read_first_count);

	int	error = index_read(buf, NULL, 0, HA_READ_AFTER_KEY);

	/* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */

	if (error == HA_ERR_KEY_NOT_FOUND) {
		error = HA_ERR_END_OF_FILE;
	}

	DBUG_RETURN(error);
}

/********************************************************************//**
Positions a cursor on the last record in an index and reads the
corresponding row to buf.
@return 0, HA_ERR_END_OF_FILE, or error code */

int
ha_innobase::index_last(
/*====================*/
	uchar*	buf)	/*!< in/out: buffer for the row */
{
	DBUG_ENTER("index_last");

	ha_statistic_increment(&SSV::ha_read_last_count);

	int	error = index_read(buf, NULL, 0, HA_READ_BEFORE_KEY);

	/* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */

	if (error == HA_ERR_KEY_NOT_FOUND) {
		error = HA_ERR_END_OF_FILE;
	}

	DBUG_RETURN(error);
}

/****************************************************************//**
Initialize a table scan.
@return 0 or error number */

int
ha_innobase::rnd_init(
/*==================*/
	bool	scan)	/*!< in: true if table/index scan FALSE otherwise */
{
	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	if (!dict_table_is_intrinsic(m_prebuilt->table)
	    && trx_in_innodb.is_aborted()) {

		return(innobase_rollback(ht, m_user_thd, false));
	}

	int	err;

	/* Store the active index value so that we can restore the original
	value after a scan */

	if (m_prebuilt->clust_index_was_generated) {
		err = change_active_index(MAX_KEY);
	} else {
		err = change_active_index(m_primary_key);
	}

	/* Don't use semi-consistent read in random row reads (by position).
	This means we must disable semi_consistent_read if scan is false */

	if (!scan) {
		try_semi_consistent_read(0);
	}

	m_start_of_scan = true;

	return(err);
}

/*****************************************************************//**
Ends a table scan.
@return 0 or error number */

int
ha_innobase::rnd_end(void)
/*======================*/
{
	return(index_end());
}

/*****************************************************************//**
Reads the next row in a table scan (also used to read the FIRST row
in a table scan).
@return 0, HA_ERR_END_OF_FILE, or error number */

int
ha_innobase::rnd_next(
/*==================*/
	uchar*	buf)	/*!< in/out: returns the row in this buffer,
			in MySQL format */
{
	int	error;

	DBUG_ENTER("rnd_next");

	ha_statistic_increment(&SSV::ha_read_rnd_next_count);

	if (m_start_of_scan) {
		error = index_first(buf);

		if (error == HA_ERR_KEY_NOT_FOUND) {
			error = HA_ERR_END_OF_FILE;
		}

		m_start_of_scan = false;
	} else {
		error = general_fetch(buf, ROW_SEL_NEXT, 0);
	}

	DBUG_RETURN(error);
}

/**********************************************************************//**
Fetches a row from the table based on a row reference.
@return 0, HA_ERR_KEY_NOT_FOUND, or error code */

int
ha_innobase::rnd_pos(
/*=================*/
	uchar*	buf,	/*!< in/out: buffer for the row */
	uchar*	pos)	/*!< in: primary key value of the row in the
			MySQL format, or the row id if the clustered
			index was internally generated by InnoDB; the
			length of data in pos has to be ref_length */
{
	DBUG_ENTER("rnd_pos");
	DBUG_DUMP("key", pos, ref_length);

	ha_statistic_increment(&SSV::ha_read_rnd_count);

	ut_a(m_prebuilt->trx == thd_to_trx(ha_thd()));

	/* Note that we assume the length of the row reference is fixed
	for the table, and it is == ref_length */

	int	error = index_read(buf, pos, ref_length, HA_READ_KEY_EXACT);

	if (error != 0) {
		DBUG_PRINT("error", ("Got error: %d", error));
	}

	DBUG_RETURN(error);
}

/**********************************************************************//**
Initialize FT index scan
@return 0 or error number */

int
ha_innobase::ft_init()
/*==================*/
{
	DBUG_ENTER("ft_init");

	trx_t*	trx = check_trx_exists(ha_thd());

	/* FTS queries are not treated as autocommit non-locking selects.
	This is because the FTS implementation can acquire locks behind
	the scenes. This has not been verified but it is safer to treat
	them as regular read only transactions for now. */

	if (!trx_is_started(trx)) {
		++trx->will_lock;
	}

	DBUG_RETURN(rnd_init(false));
}

/**********************************************************************//**
Initialize FT index scan
@return FT_INFO structure if successful or NULL */

FT_INFO*
ha_innobase::ft_init_ext(
/*=====================*/
	uint			flags,	/* in: */
	uint			keynr,	/* in: */
	String*			key)	/* in: */
{
	NEW_FT_INFO*		fts_hdl = NULL;
	dict_index_t*		index;
	fts_result_t*		result;
	char			buf_tmp[8192];
	ulint			buf_tmp_used;
	uint			num_errors;
	ulint			query_len = key->length();
	const CHARSET_INFO*	char_set = key->charset();
	const char*		query = key->ptr();

	if (fts_enable_diag_print) {
		{
			ib::info	out;
			out << "keynr=" << keynr << ", '";
			out.write(key->ptr(), key->length());
		}

		if (flags & FT_BOOL) {
			ib::info() << "BOOL search";
		} else {
			ib::info() << "NL search";
		}
	}

	/* FIXME: utf32 and utf16 are not compatible with some
	string function used. So to convert them to uft8 before
	we proceed. */
	if (strcmp(char_set->csname, "utf32") == 0
	    || strcmp(char_set->csname, "utf16") == 0) {

		buf_tmp_used = innobase_convert_string(
			buf_tmp, sizeof(buf_tmp) - 1,
			&my_charset_utf8_general_ci,
			query, query_len, (CHARSET_INFO*) char_set,
			&num_errors);

		buf_tmp[buf_tmp_used] = 0;
		query = buf_tmp;
		query_len = buf_tmp_used;
	}

	trx_t*	trx = m_prebuilt->trx;

	TrxInInnoDB	trx_in_innodb(trx);

	if (trx_in_innodb.is_aborted()) {

		int	ret = innobase_rollback(ht, m_user_thd, false);

		my_error(ret, MYF(0));

		return(NULL);
	}

	/* FTS queries are not treated as autocommit non-locking selects.
	This is because the FTS implementation can acquire locks behind
	the scenes. This has not been verified but it is safer to treat
	them as regular read only transactions for now. */

	if (!trx_is_started(trx)) {
		++trx->will_lock;
	}

	dict_table_t*	ft_table = m_prebuilt->table;

	/* Table does not have an FTS index */
	if (!ft_table->fts || ib_vector_is_empty(ft_table->fts->indexes)) {
		my_error(ER_TABLE_HAS_NO_FT, MYF(0));
		return(NULL);
	}

	/* If tablespace is discarded, we should return here */
	if (dict_table_is_discarded(ft_table)) {
		my_error(ER_NO_SUCH_TABLE, MYF(0), table->s->db.str,
			 table->s->table_name.str);
		return(NULL);
	}

	if (keynr == NO_SUCH_KEY) {
		/* FIXME: Investigate the NO_SUCH_KEY usage */
		index = reinterpret_cast<dict_index_t*>
			(ib_vector_getp(ft_table->fts->indexes, 0));
	} else {
		index = innobase_get_index(keynr);
	}

	if (index == NULL || index->type != DICT_FTS) {
		my_error(ER_TABLE_HAS_NO_FT, MYF(0));
		return(NULL);
	}

	if (!(ft_table->fts->fts_status & ADDED_TABLE_SYNCED)) {
		fts_init_index(ft_table, FALSE);

		ft_table->fts->fts_status |= ADDED_TABLE_SYNCED;
	}

	const byte*	q = reinterpret_cast<const byte*>(
		const_cast<char*>(query));

	dberr_t	error = fts_query(trx, index, flags, q, query_len, &result);

	if (error != DB_SUCCESS) {
		my_error(convert_error_code_to_mysql(error, 0, NULL), MYF(0));
		return(NULL);
	}

	/* Allocate FTS handler, and instantiate it before return */
	fts_hdl = reinterpret_cast<NEW_FT_INFO*>(
		my_malloc(PSI_INSTRUMENT_ME, sizeof(NEW_FT_INFO), MYF(0)));

	fts_hdl->please = const_cast<_ft_vft*>(&ft_vft_result);
	fts_hdl->could_you = const_cast<_ft_vft_ext*>(&ft_vft_ext_result);
	fts_hdl->ft_prebuilt = m_prebuilt;
	fts_hdl->ft_result = result;

	/* FIXME: Re-evaluate the condition when Bug 14469540 is resolved */
	m_prebuilt->in_fts_query = true;

	return(reinterpret_cast<FT_INFO*>(fts_hdl));
}

/**********************************************************************//**
Initialize FT index scan
@return FT_INFO structure if successful or NULL */

FT_INFO*
ha_innobase::ft_init_ext_with_hints(
/*================================*/
	uint			keynr,		/* in: key num */
	String*			key,		/* in: key */
	Ft_hints*		hints)		/* in: hints  */
{
	/* TODO Implement function properly working with FT hint. */
	return(ft_init_ext(hints->get_flags(), keynr, key));
}

/*****************************************************************//**
Set up search tuple for a query through FTS_DOC_ID_INDEX on
supplied Doc ID. This is used by MySQL to retrieve the documents
once the search result (Doc IDs) is available */
static
void
innobase_fts_create_doc_id_key(
/*===========================*/
	dtuple_t*	tuple,		/* in/out: m_prebuilt->search_tuple */
	const dict_index_t*
			index,		/* in: index (FTS_DOC_ID_INDEX) */
	doc_id_t*	doc_id)		/* in/out: doc id to search, value
					could be changed to storage format
					used for search. */
{
	doc_id_t	temp_doc_id;
	dfield_t*	dfield = dtuple_get_nth_field(tuple, 0);

	ut_a(dict_index_get_n_unique(index) == 1);

	dtuple_set_n_fields(tuple, index->n_fields);
	dict_index_copy_types(tuple, index, index->n_fields);

#ifdef UNIV_DEBUG
	/* The unique Doc ID field should be an eight-bytes integer */
	dict_field_t*	field = dict_index_get_nth_field(index, 0);
        ut_a(field->col->mtype == DATA_INT);
	ut_ad(sizeof(*doc_id) == field->fixed_len);
	ut_ad(!strcmp(index->name, FTS_DOC_ID_INDEX_NAME));
#endif /* UNIV_DEBUG */

	/* Convert to storage byte order */
	mach_write_to_8(reinterpret_cast<byte*>(&temp_doc_id), *doc_id);
	*doc_id = temp_doc_id;
	dfield_set_data(dfield, doc_id, sizeof(*doc_id));

        dtuple_set_n_fields_cmp(tuple, 1);

	for (ulint i = 1; i < index->n_fields; i++) {
		dfield = dtuple_get_nth_field(tuple, i);
		dfield_set_null(dfield);
	}
}

/**********************************************************************//**
Fetch next result from the FT result set
@return error code */

int
ha_innobase::ft_read(
/*=================*/
	uchar*		buf)		/*!< in/out: buf contain result row */
{
	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	if (trx_in_innodb.is_aborted()) {

		return(innobase_rollback(ht, m_user_thd, false));
	}

	row_prebuilt_t*	ft_prebuilt;

	ft_prebuilt = reinterpret_cast<NEW_FT_INFO*>(ft_handler)->ft_prebuilt;

	ut_a(ft_prebuilt == m_prebuilt);

	fts_result_t*	result;

	result = reinterpret_cast<NEW_FT_INFO*>(ft_handler)->ft_result;

	if (result->current == NULL) {
		/* This is the case where the FTS query did not
		contain and matching documents. */
		if (result->rankings_by_id != NULL) {
			/* Now that we have the complete result, we
			need to sort the document ids on their rank
			calculation. */

			fts_query_sort_result_on_rank(result);

			result->current = const_cast<ib_rbt_node_t*>(
				rbt_first(result->rankings_by_rank));
		} else {
			ut_a(result->current == NULL);
		}
	} else {
		result->current = const_cast<ib_rbt_node_t*>(
			rbt_next(result->rankings_by_rank, result->current));
	}

next_record:

	if (result->current != NULL) {
		doc_id_t	search_doc_id;
		dtuple_t*	tuple = m_prebuilt->search_tuple;

		/* If we only need information from result we can return
		   without fetching the table row */
		if (ft_prebuilt->read_just_key) {
			if (m_prebuilt->fts_doc_id_in_read_set) {
				fts_ranking_t* ranking;
				ranking = rbt_value(fts_ranking_t,
						    result->current);
				innobase_fts_store_docid(
					table, ranking->doc_id);
			}
			table->status= 0;
			return(0);
		}

		dict_index_t*	index;

		index = m_prebuilt->table->fts_doc_id_index;

		/* Must find the index */
		ut_a(index != NULL);

		/* Switch to the FTS doc id index */
		m_prebuilt->index = index;

		fts_ranking_t*	ranking = rbt_value(
			fts_ranking_t, result->current);

		search_doc_id = ranking->doc_id;

		/* We pass a pointer of search_doc_id because it will be
		converted to storage byte order used in the search
		tuple. */
		innobase_fts_create_doc_id_key(tuple, index, &search_doc_id);

		innobase_srv_conc_enter_innodb(m_prebuilt);

		dberr_t ret = row_search_for_mysql(
			(byte*) buf, PAGE_CUR_GE, m_prebuilt, ROW_SEL_EXACT, 0);

		innobase_srv_conc_exit_innodb(m_prebuilt);

		int	error;

		switch (ret) {
		case DB_SUCCESS:
			error = 0;
			table->status = 0;
			break;
		case DB_RECORD_NOT_FOUND:
			result->current = const_cast<ib_rbt_node_t*>(
				rbt_next(result->rankings_by_rank,
					 result->current));

			if (!result->current) {
				/* exhaust the result set, should return
				HA_ERR_END_OF_FILE just like
				ha_innobase::general_fetch() and/or
				ha_innobase::index_first() etc. */
				error = HA_ERR_END_OF_FILE;
				table->status = STATUS_NOT_FOUND;
			} else {
				goto next_record;
			}
			break;
		case DB_END_OF_INDEX:
			error = HA_ERR_END_OF_FILE;
			table->status = STATUS_NOT_FOUND;
			break;
		case DB_TABLESPACE_DELETED:

			ib_senderrf(
				m_prebuilt->trx->mysql_thd, IB_LOG_LEVEL_ERROR,
				ER_TABLESPACE_DISCARDED,
				table->s->table_name.str);

			table->status = STATUS_NOT_FOUND;
			error = HA_ERR_NO_SUCH_TABLE;
			break;
		case DB_TABLESPACE_NOT_FOUND:

			ib_senderrf(
				m_prebuilt->trx->mysql_thd, IB_LOG_LEVEL_ERROR,
				ER_TABLESPACE_MISSING,
				table->s->table_name.str);

			table->status = STATUS_NOT_FOUND;
			error = HA_ERR_TABLESPACE_MISSING;
			break;
		default:
			error = convert_error_code_to_mysql(
				ret, 0, m_user_thd);

			table->status = STATUS_NOT_FOUND;
			break;
		}

		return(error);
	}

	return(HA_ERR_END_OF_FILE);
}

/*************************************************************************
*/

void
ha_innobase::ft_end()
{
	ib::info() << "ft_end()";

	rnd_end();
}

/*********************************************************************//**
Stores a reference to the current row to 'ref' field of the handle. Note
that in the case where we have generated the clustered index for the
table, the function parameter is illogical: we MUST ASSUME that 'record'
is the current 'position' of the handle, because if row ref is actually
the row id internally generated in InnoDB, then 'record' does not contain
it. We just guess that the row id must be for the record where the handle
was positioned the last time. */

void
ha_innobase::position(
/*==================*/
	const uchar*	record)	/*!< in: row in MySQL format */
{
	uint		len;

	ut_a(m_prebuilt->trx == thd_to_trx(ha_thd()));

	if (m_prebuilt->clust_index_was_generated) {
		/* No primary key was defined for the table and we
		generated the clustered index from row id: the
		row reference will be the row id, not any key value
		that MySQL knows of */

		len = DATA_ROW_ID_LEN;

		memcpy(ref, m_prebuilt->row_id, len);
	} else {

		/* Copy primary key as the row reference */
		KEY*	key_info = table->key_info + m_primary_key;
		key_copy(ref, (uchar*)record, key_info, key_info->key_length);
		len = key_info->key_length;
	}

	/* We assume that the 'ref' value len is always fixed for the same
	table. */

	if (len != ref_length) {
		sql_print_error("Stored ref len is %lu, but table ref len is"
				" %lu", (ulong) len, (ulong) ref_length);
	}
}

/*****************************************************************//**
Check whether there exist a column named as "FTS_DOC_ID", which is
reserved for InnoDB FTS Doc ID
@return true if there exist a "FTS_DOC_ID" column */
static
bool
create_table_check_doc_id_col(
/*==========================*/
	trx_t*		trx,		/*!< in: InnoDB transaction handle */
	const TABLE*	form,		/*!< in: information on table
					columns and indexes */
	ulint*		doc_id_col)	/*!< out: Doc ID column number if
					there exist a FTS_DOC_ID column,
					ULINT_UNDEFINED if column is of the
					wrong type/name/size */
{
	for (ulint i = 0; i < form->s->fields; i++) {
		const Field*	field;
		ulint		col_type;
		ulint		col_len;
		ulint		unsigned_type;

		field = form->field[i];
		if (!field->stored_in_db)
		  continue;

		col_type = get_innobase_type_from_mysql_type(
			&unsigned_type, field);

		col_len = field->pack_length();

		if (innobase_strcasecmp(field->field_name,
					FTS_DOC_ID_COL_NAME) == 0) {

			/* Note the name is case sensitive due to
			our internal query parser */
			if (col_type == DATA_INT
			    && !field->real_maybe_null()
			    && col_len == sizeof(doc_id_t)
			    && (strcmp(field->field_name,
				      FTS_DOC_ID_COL_NAME) == 0)) {
				*doc_id_col = i;
			} else {
				push_warning_printf(
					trx->mysql_thd,
					Sql_condition::SL_WARNING,
					ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: FTS_DOC_ID column must be"
					" of BIGINT NOT NULL type, and named"
					" in all capitalized characters");
				my_error(ER_WRONG_COLUMN_NAME, MYF(0),
					 field->field_name);
				*doc_id_col = ULINT_UNDEFINED;
			}

			return(true);
		}
	}

	return(false);
}

/** Set up base columns for virtual column
@param[in]	table		InnoDB table
@param[in]	field		MySQL field
@param[in,out]	v_col		virtual column */
void
innodb_base_col_setup(
	dict_table_t*	table,
	const Field*	field,
	dict_v_col_t*	v_col)
{
	int     n = 0;

	for (uint i= 0; i < field->table->s->fields; ++i) {
		const Field* base_field = field->table->field[i];

		if (!base_field->is_virtual_gcol()
        && bitmap_is_set(&field->gcol_info->base_columns_map, i)) {
			ulint   z;

			for (z = 0; z < table->n_cols; z++) {
				const char* name = dict_table_get_col_name(table, z);
				if (!innobase_strcasecmp(name,
																 base_field->field_name)) {
					break;
				}
			}

			ut_ad(z != table->n_cols);

			v_col->base_col[n] = dict_table_get_nth_col(table, z);
			ut_ad(v_col->base_col[n]->ind == z);
			n++;
		}
	}
}

/** Create a table definition to an InnoDB database.
@return ER_* level error */
inline __attribute__((warn_unused_result))
int
create_table_info_t::create_table_def()
{
	dict_table_t*	table;
	ulint		n_cols;
	dberr_t		err;
	ulint		col_type;
	ulint		col_len;
	ulint		nulls_allowed;
	ulint		unsigned_type;
	ulint		binary_type;
	ulint		long_true_varchar;
	ulint		charset_no;
	ulint		i;
	ulint		j = 0;
	ulint		doc_id_col = 0;
	ibool		has_doc_id_col = FALSE;
	mem_heap_t*	heap;
	ulint		num_v = 0;
	ulint		space_id = 0;
	ulint		actual_n_cols;

	DBUG_ENTER("create_table_def");
	DBUG_PRINT("enter", ("table_name: %s", m_table_name));

	DBUG_ASSERT(m_trx->mysql_thd == m_thd);

	/* MySQL does the name length check. But we do additional check
	on the name length here */
	const size_t	table_name_len = strlen(m_table_name);
	if (table_name_len > MAX_FULL_NAME_LEN) {
		push_warning_printf(
			m_thd, Sql_condition::SL_WARNING,
			ER_TABLE_NAME,
			"InnoDB: Table Name or Database Name is too long");

		DBUG_RETURN(ER_TABLE_NAME);
	}

	if (m_table_name[table_name_len - 1] == '/') {
		push_warning_printf(
			m_thd, Sql_condition::SL_WARNING,
			ER_TABLE_NAME,
			"InnoDB: Table name is empty");

		DBUG_RETURN(ER_WRONG_TABLE_NAME);
	}

	n_cols = m_form->s->fields;

	/* Find out any virtual column */
	for (i = 0; i < n_cols; i++) {
		Field*	field = m_form->field[i];

		if (innobase_is_v_fld(field)) {
			num_v++;
		}
	}

	ut_ad(trx_state_eq(m_trx, TRX_STATE_NOT_STARTED));

	/* Check whether there already exists a FTS_DOC_ID column */
	if (create_table_check_doc_id_col(m_trx, m_form, &doc_id_col)){

		/* Raise error if the Doc ID column is of wrong type or name */
		if (doc_id_col == ULINT_UNDEFINED) {

			err = DB_ERROR;
			goto error_ret;
		} else {
			has_doc_id_col = TRUE;
		}
	}

	/* For single-table tablespaces, we pass 0 as the space id, and then
	determine the actual space id when the tablespace is created. */
	if (DICT_TF_HAS_SHARED_SPACE(m_flags)) {
		ut_ad(m_tablespace != NULL && m_tablespace[0] != '\0');

		space_id = fil_space_get_id_by_name(m_tablespace);
	}

	/* Adjust the number of columns for the FTS hidden field */
	actual_n_cols = n_cols;
	if (m_flags2 & DICT_TF2_FTS && !has_doc_id_col) {
		actual_n_cols += 1;
	}

	table = dict_mem_table_create(m_table_name, space_id,
				      actual_n_cols, num_v, m_flags, m_flags2);

	/* Set the hidden doc_id column. */
	if (m_flags2 & DICT_TF2_FTS) {
		table->fts->doc_col = has_doc_id_col
				      ? doc_id_col : n_cols - num_v;
	}

	if (strlen(m_temp_path) != 0) {
		table->dir_path_of_temp_table =
			mem_heap_strdup(table->heap, m_temp_path);
	}

	if (DICT_TF_HAS_DATA_DIR(m_flags)) {
		ut_a(strlen(m_remote_path));

		table->data_dir_path = mem_heap_strdup(
			table->heap, m_remote_path);

	} else {
		table->data_dir_path = NULL;
	}

	if (DICT_TF_HAS_SHARED_SPACE(m_flags)) {
		ut_ad(strlen(m_tablespace));
		table->tablespace = mem_heap_strdup(table->heap, m_tablespace);
	} else {
		table->tablespace = NULL;
	}

	heap = mem_heap_create(1000);

	for (i = 0; i < n_cols; i++) {
		ulint	is_virtual;

		Field*	field = m_form->field[i];

		/* Generate a unique column name by pre-pending table-name for
		intrinsic tables. For other tables (including normal
		temporary) column names are unique. If not, MySQL layer will
		block such statement.
		This is work-around fix till Optimizer can handle this issue
		(probably 5.7.4+). */
		char field_name[MAX_FULL_NAME_LEN + 2 + 10];

		if (dict_table_is_intrinsic(table) && field->orig_table) {

			ut_snprintf(field_name, sizeof(field_name),
				    "%s_%s_%lu", field->orig_table->alias,
				    field->field_name, i);

		} else {
			ut_snprintf(field_name, sizeof(field_name),
				    "%s", field->field_name);
		}

		col_type = get_innobase_type_from_mysql_type(
			&unsigned_type, field);

		if (!col_type) {
			push_warning_printf(
				m_thd, Sql_condition::SL_WARNING,
				ER_CANT_CREATE_TABLE,
				"Error creating table '%s' with"
				" column '%s'. Please check its"
				" column type and try to re-create"
				" the table with an appropriate"
				" column type.",
				table->name.m_name, field->field_name);
			goto err_col;
		}

		nulls_allowed = field->real_maybe_null() ? 0 : DATA_NOT_NULL;
		binary_type = field->binary() ? DATA_BINARY_TYPE : 0;

		charset_no = 0;

		if (dtype_is_string_type(col_type)) {

			charset_no = (ulint) field->charset()->number;

			DBUG_EXECUTE_IF("simulate_max_char_col",
					charset_no = MAX_CHAR_COLL_NUM + 1;
					);

			if (charset_no > MAX_CHAR_COLL_NUM) {
				/* in data0type.h we assume that the
				number fits in one byte in prtype */
				push_warning_printf(
					m_thd, Sql_condition::SL_WARNING,
					ER_CANT_CREATE_TABLE,
					"In InnoDB, charset-collation codes"
					" must be below 256."
					" Unsupported code %lu.",
					(ulong) charset_no);
				mem_heap_free(heap);
				dict_mem_table_free(table);

				ut_ad(trx_state_eq(
					m_trx, TRX_STATE_NOT_STARTED));

				DBUG_RETURN(ER_CANT_CREATE_TABLE);
			}
		}

		col_len = field->pack_length();

		/* The MySQL pack length contains 1 or 2 bytes length field
		for a true VARCHAR. Let us subtract that, so that the InnoDB
		column length in the InnoDB data dictionary is the real
		maximum byte length of the actual data. */

		long_true_varchar = 0;

		if (field->type() == MYSQL_TYPE_VARCHAR) {
			col_len -= ((Field_varstring*) field)->length_bytes;

			if (((Field_varstring*) field)->length_bytes == 2) {
				long_true_varchar = DATA_LONG_TRUE_VARCHAR;
			}
		}

		if (col_type == DATA_POINT) {
			col_len = DATA_POINT_LEN;
		}

		is_virtual = (innobase_is_v_fld(field)) ? DATA_VIRTUAL : 0;

		/* First check whether the column to be added has a
		system reserved name. */
		if (dict_col_name_is_reserved(field_name)){
			my_error(ER_WRONG_COLUMN_NAME, MYF(0),
				 field_name);
err_col:
			dict_mem_table_free(table);
			mem_heap_free(heap);
			ut_ad(trx_state_eq(m_trx, TRX_STATE_NOT_STARTED));

			err = DB_ERROR;
			goto error_ret;
		}

		if (!is_virtual) {
			dict_mem_table_add_col(table, heap,
				field_name, col_type,
				dtype_form_prtype(
					(ulint) field->type()
					| nulls_allowed | unsigned_type
					| binary_type | long_true_varchar,
					charset_no),
				col_len);
		} else {
			dict_mem_table_add_v_col(table, heap,
				field_name, col_type,
				dtype_form_prtype(
					(ulint) field->type()
					| nulls_allowed | unsigned_type
					| binary_type | long_true_varchar
					| is_virtual,
					charset_no),
				col_len, i,
				field->gcol_info->non_virtual_base_columns());
		}
	}

	if (num_v) {
		for (i = 0; i < n_cols; i++) {
			dict_v_col_t*	v_col;

			Field*	field = m_form->field[i];

			if (!innobase_is_v_fld(field)) {
				continue;
			}

			v_col = dict_table_get_nth_v_col(table, j);

			j++;

			innodb_base_col_setup(table, field, v_col);
		}
	}

	/* Add the FTS doc_id hidden column. */
	if (m_flags2 & DICT_TF2_FTS && !has_doc_id_col) {
		fts_add_doc_id_column(table, heap);
	}

	ut_ad(trx_state_eq(m_trx, TRX_STATE_NOT_STARTED));

	/* If temp table, then we avoid creation of entries in SYSTEM TABLES.
	Given that temp table lifetime is limited to connection/server lifetime
	on re-start we don't need to restore temp-table and so no entry is
	needed in SYSTEM tables. */
	if (dict_table_is_temporary(table)) {

		if (m_create_info->compress.length > 0) {

			push_warning_printf(
				m_thd,
				Sql_condition::SL_WARNING,
				HA_ERR_UNSUPPORTED,
				"InnoDB: Compression not supported for "
				"temporary tables");

			err = DB_UNSUPPORTED;
			dict_mem_table_free(table);
		} else if (m_create_info->encrypt_type.length > 0
			   && !Encryption::is_none(
				   m_create_info->encrypt_type.str)) {

			my_error(ER_TABLESPACE_CANNOT_ENCRYPT, MYF(0));
			err = DB_UNSUPPORTED;
			dict_mem_table_free(table);
		} else {

			/* Get a new table ID */
			dict_table_assign_new_id(table, m_trx);

			/* Create temp tablespace if configured. */
			err = dict_build_tablespace_for_table(table);

			if (err == DB_SUCCESS) {
				/* Temp-table are maintained in memory and so
				can_be_evicted is FALSE. */
				mem_heap_t* temp_table_heap;

				temp_table_heap = mem_heap_create(256);

				/* For intrinsic table (given that they are
				not shared beyond session scope), add
				it to session specific THD structure
				instead of adding it to dictionary cache. */
				if (dict_table_is_intrinsic(table)) {
					add_table_to_thread_cache(
						table, temp_table_heap, m_thd);

				} else {
					dict_table_add_to_cache(
						table, FALSE, temp_table_heap);
				}

				DBUG_EXECUTE_IF("ib_ddl_crash_during_create2",
						DBUG_SUICIDE(););

				mem_heap_free(temp_table_heap);
			}
		}

	} else {

                const char*     algorithm = m_create_info->compress.str;

		err = DB_SUCCESS;

		if (!(m_flags2 & DICT_TF2_USE_FILE_PER_TABLE)
		    && m_create_info->compress.length > 0
		    && !Compression::is_none(algorithm)) {

			push_warning_printf(
				m_thd,
				Sql_condition::SL_WARNING,
				HA_ERR_UNSUPPORTED,
				"InnoDB: Compression not supported for "
				"shared tablespaces");

			algorithm = NULL;

			err = DB_UNSUPPORTED;
			dict_mem_table_free(table);

		} else if (Compression::validate(algorithm) != DB_SUCCESS
			   || m_form->s->row_type == ROW_TYPE_COMPRESSED
			   || m_create_info->key_block_size > 0) {

			algorithm = NULL;
                }

		const char*	encrypt = m_create_info->encrypt_type.str;

		if (!(m_flags2 & DICT_TF2_USE_FILE_PER_TABLE)
		    && m_create_info->encrypt_type.length > 0
		    && !Encryption::is_none(encrypt)) {

			my_error(ER_TABLESPACE_CANNOT_ENCRYPT, MYF(0));
			err = DB_UNSUPPORTED;
			dict_mem_table_free(table);

		} else if (!Encryption::is_none(encrypt)) {
			/* Set the encryption flag. */
			byte*	master_key = NULL;
			ulint	master_key_id;

			/* Check if keyring is ready. */
			Encryption::get_master_key(&master_key_id,
						   &master_key);

			if (master_key == NULL) {
				my_error(ER_CANNOT_FIND_KEY_IN_KEYRING,
					 MYF(0));
				err = DB_UNSUPPORTED;
				dict_mem_table_free(table);
			} else {
				my_free(master_key);
				DICT_TF2_FLAG_SET(table,
						  DICT_TF2_ENCRYPTION);
			}
		}

		if (err == DB_SUCCESS) {
			err = row_create_table_for_mysql(
				table, algorithm, m_trx, false);
		}

		if (err == DB_IO_NO_PUNCH_HOLE_FS) {

			ut_ad(!is_shared_tablespace(table->space));

			push_warning_printf(
				m_thd,
				Sql_condition::SL_WARNING,
				HA_ERR_UNSUPPORTED,
				"InnoDB: Punch hole not supported by the "
				"file system or the tablespace page size "
				"is not large enough. Compression disabled");

			err = DB_SUCCESS;
		}

		DBUG_EXECUTE_IF("ib_crash_during_create_for_encryption",
				DBUG_SUICIDE(););
	}

	mem_heap_free(heap);

	DBUG_EXECUTE_IF("ib_create_err_tablespace_exist",
			err = DB_TABLESPACE_EXISTS;);

	if (err == DB_DUPLICATE_KEY || err == DB_TABLESPACE_EXISTS) {
		char display_name[FN_REFLEN];
		char* buf_end = innobase_convert_identifier(
			display_name, sizeof(display_name) - 1,
			m_table_name, strlen(m_table_name),
			m_thd);

		*buf_end = '\0';

		my_error(err == DB_DUPLICATE_KEY
			 ? ER_TABLE_EXISTS_ERROR
			 : ER_TABLESPACE_EXISTS, MYF(0), display_name);
	}

	if (err == DB_SUCCESS && (m_flags2 & DICT_TF2_FTS)) {
		fts_optimize_add_table(table);
	}

error_ret:
	DBUG_RETURN(convert_error_code_to_mysql(err, m_flags, m_thd));
}

/*****************************************************************//**
Creates an index in an InnoDB database. */
inline
int
create_index(
/*=========*/
	trx_t*		trx,		/*!< in: InnoDB transaction handle */
	const TABLE*	form,		/*!< in: information on table
					columns and indexes */
	ulint		flags,		/*!< in: InnoDB table flags */
	const char*	table_name,	/*!< in: table name */
	uint		key_num)	/*!< in: index number */
{
	dict_index_t*	index;
	int		error;
	const KEY*	key;
	ulint		ind_type;
	ulint*		field_lengths;

	DBUG_ENTER("create_index");

	key = form->key_info + key_num;

	/* Assert that "GEN_CLUST_INDEX" cannot be used as non-primary index */
	ut_a(innobase_strcasecmp(key->name, innobase_index_reserve_name) != 0);

	ind_type = 0;
	if (key->flags & HA_SPATIAL) {
		ind_type = DICT_SPATIAL;
	} else if (key->flags & HA_FULLTEXT) {
		ind_type = DICT_FTS;
	}

	if (ind_type != 0)
	{
		index = dict_mem_index_create(table_name, key->name, 0,
					      ind_type,
					      key->user_defined_key_parts);

		for (ulint i = 0; i < key->user_defined_key_parts; i++) {
			KEY_PART_INFO*	key_part = key->key_part + i;

			/* We do not support special (Fulltext or Spatial)
			index on virtual columns */
			if (innobase_is_v_fld(key_part->field)) {
				ut_ad(0);
				DBUG_RETURN(HA_ERR_UNSUPPORTED);
			}

			dict_mem_index_add_field(
				index, key_part->field->field_name, 0);
		}

		DBUG_RETURN(convert_error_code_to_mysql(
				    row_create_index_for_mysql(
					    index, trx, NULL, NULL),
				    flags, NULL));

	}

	ind_type = 0;

	if (key_num == form->s->primary_key) {
		ind_type |= DICT_CLUSTERED;
	}

	if (key->flags & HA_NOSAME) {
		ind_type |= DICT_UNIQUE;
	}

	field_lengths = (ulint*) my_malloc(PSI_INSTRUMENT_ME,
		key->user_defined_key_parts * sizeof *
				field_lengths, MYF(MY_FAE));

	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */

	index = dict_mem_index_create(table_name, key->name, 0,
				      ind_type, key->user_defined_key_parts);

	innodb_session_t*& priv = thd_to_innodb_session(trx->mysql_thd);
	dict_table_t* handler = priv->lookup_table_handler(table_name);

	if (handler != NULL) {
		/* This setting will enforce SQL NULL == SQL NULL.
		For now this is turned-on for intrinsic tables
		only but can be turned on for other tables if needed arises. */
		index->nulls_equal =
			(key->flags & HA_NULL_ARE_EQUAL) ? true : false;

		/* Disable use of AHI for intrinsic table indexes as AHI
		validates the predicated entry using index-id which has to be
		system-wide unique that is not the case with indexes of
		intrinsic table for performance reason.
		Also given the lifetime of these tables and frequent delete
		and update AHI would not help on performance front as it does
		with normal tables. */
		index->disable_ahi = true;
	}

	for (ulint i = 0; i < key->user_defined_key_parts; i++) {
		KEY_PART_INFO*	key_part = key->key_part + i;
		ulint		prefix_len;
		ulint		col_type;
		ulint		is_unsigned;


		/* (The flag HA_PART_KEY_SEG denotes in MySQL a
		column prefix field in an index: we only store a
		specified number of first bytes of the column to
		the index field.) The flag does not seem to be
		properly set by MySQL. Let us fall back on testing
		the length of the key part versus the column.
		We first reach to the table's column; if the index is on a
		prefix, key_part->field is not the table's column (it's a
		"fake" field forged in open_table_from_share() with length
		equal to the length of the prefix); so we have to go to
		form->fied. */
		Field*	field= form->field[key_part->field->field_index];
		if (field == NULL)
		  ut_error;

		const char*	field_name = key_part->field->field_name;
		if (handler != NULL && dict_table_is_intrinsic(handler)) {

			ut_ad(!innobase_is_v_fld(key_part->field));
			ulint	col_no = dict_col_get_no(dict_table_get_nth_col(
					handler, key_part->field->field_index));
			field_name = dict_table_get_col_name(handler, col_no);
		}

		col_type = get_innobase_type_from_mysql_type(
			&is_unsigned, key_part->field);

		if (DATA_LARGE_MTYPE(col_type)
		    || (key_part->length < field->pack_length()
			&& field->type() != MYSQL_TYPE_VARCHAR)
		    || (field->type() == MYSQL_TYPE_VARCHAR
			&& key_part->length < field->pack_length()
			- ((Field_varstring*) field)->length_bytes)) {

			switch (col_type) {
			default:
				prefix_len = key_part->length;
				break;
			case DATA_INT:
			case DATA_FLOAT:
			case DATA_DOUBLE:
			case DATA_DECIMAL:
				sql_print_error(
					"MySQL is trying to create a column"
					" prefix index field, on an"
					" inappropriate data type. Table"
					" name %s, column name %s.",
					table_name,
					key_part->field->field_name);

				prefix_len = 0;
			}
		} else {
			prefix_len = 0;
		}

		field_lengths[i] = key_part->length;

		if (innobase_is_v_fld(key_part->field)) {
			index->type |= DICT_VIRTUAL;
		}

		dict_mem_index_add_field(index, field_name, prefix_len);
	}

	ut_ad(key->flags & HA_FULLTEXT || !(index->type & DICT_FTS));

	/* Even though we've defined max_supported_key_part_length, we
	still do our own checking using field_lengths to be absolutely
	sure we don't create too long indexes. */

	error = convert_error_code_to_mysql(
		row_create_index_for_mysql(index, trx, field_lengths, handler),
		flags, NULL);

	if (error && handler != NULL) {
		priv->unregister_table_handler(table_name);
	}

	my_free(field_lengths);

	DBUG_RETURN(error);
}

/*****************************************************************//**
Creates an index to an InnoDB table when the user has defined no
primary index. */
inline
int
create_clustered_index_when_no_primary(
/*===================================*/
	trx_t*		trx,		/*!< in: InnoDB transaction handle */
	ulint		flags,		/*!< in: InnoDB table flags */
	const char*	table_name)	/*!< in: table name */
{
	dict_index_t*	index;
	dberr_t		error;

	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
	index = dict_mem_index_create(table_name,
				      innobase_index_reserve_name,
				      0, DICT_CLUSTERED, 0);

	innodb_session_t*& priv = thd_to_innodb_session(trx->mysql_thd);

	dict_table_t* handler = priv->lookup_table_handler(table_name);

	if (handler != NULL) {
		/* Disable use of AHI for intrinsic table indexes as AHI
		validates the predicated entry using index-id which has to be
		system-wide unique that is not the case with indexes of
		intrinsic table for performance reason.
		Also given the lifetime of these tables and frequent delete
		and update AHI would not help on performance front as it does
		with normal tables. */
		index->disable_ahi = true;
	}

	error = row_create_index_for_mysql(index, trx, NULL, handler);

	if (error != DB_SUCCESS && handler != NULL) {
		priv->unregister_table_handler(table_name);
	}

	return(convert_error_code_to_mysql(error, flags, NULL));
}

/** Return a display name for the row format
@param[in]	row_format	Row Format
@return row format name */
const char*
get_row_format_name(
	enum row_type	row_format)
{
	switch (row_format) {
	case ROW_TYPE_COMPACT:
		return("COMPACT");
	case ROW_TYPE_COMPRESSED:
		return("COMPRESSED");
	case ROW_TYPE_DYNAMIC:
		return("DYNAMIC");
	case ROW_TYPE_REDUNDANT:
		return("REDUNDANT");
	case ROW_TYPE_DEFAULT:
		return("DEFAULT");
	case ROW_TYPE_FIXED:
		return("FIXED");
	case ROW_TYPE_PAGE:
	case ROW_TYPE_NOT_USED:
	default:
		break;
	}
	return("NOT USED");
}

/** Validate DATA DIRECTORY option.
@return true if valid, false if not. */
bool
create_table_info_t::create_option_data_directory_is_valid()
{
	bool		is_valid = true;

	ut_ad(m_create_info->data_file_name
	      && m_create_info->data_file_name[0] != '\0');

	/* Use DATA DIRECTORY only with file-per-table. */
	if (!m_use_shared_space && !m_allow_file_per_table) {
		push_warning(
			m_thd, Sql_condition::SL_WARNING,
			ER_ILLEGAL_HA_CREATE_OPTION,
			"InnoDB: DATA DIRECTORY requires"
			" innodb_file_per_table.");
		is_valid = false;
	}

	/* Do not use DATA DIRECTORY with TEMPORARY TABLE. */
	if (m_create_info->options & HA_LEX_CREATE_TMP_TABLE) {
		push_warning(
			m_thd, Sql_condition::SL_WARNING,
			ER_ILLEGAL_HA_CREATE_OPTION,
			"InnoDB: DATA DIRECTORY cannot be used"
			" for TEMPORARY tables.");
		is_valid = false;
	}

	/* We check for a DATA DIRECTORY mixed with TABLESPACE in
	create_option_tablespace_is_valid(), no need to here. */

	return(is_valid);
}

/** Validate the tablespace name provided for a tablespace DDL
@param[in]	name		A proposed tablespace name
@param[in]	for_table	Caller is putting a table here
@return MySQL handler error code like HA_... */
static
int
validate_tablespace_name(
	const char*	name,
	bool		for_table)
{
	int	err = 0;

	/* This prefix is reserved by InnoDB for use in internal tablespace names. */
	const char reserved_space_name_prefix[] = "innodb_";

	if (check_tablespace_name(name) != IDENT_NAME_OK) {
		err = HA_WRONG_CREATE_OPTION;
	}

	/* The tablespace name cannot start with `innodb_`. */
	if (strlen(name) >= sizeof(reserved_space_name_prefix) - 1
	    && 0 == memcmp(name, reserved_space_name_prefix,
			   sizeof(reserved_space_name_prefix) - 1)) {

		/* Use a different message for reserved names */
		if (0 == strcmp(name, reserved_file_per_table_space_name)
		    || 0 == strcmp(name, reserved_system_space_name)
		    || 0 == strcmp(name, reserved_temporary_space_name)) {
			/* Allow these names if the caller is putting a
			table into one of these by CREATE/ALTER TABLE */
			if (!for_table) {
				my_printf_error(
					ER_WRONG_TABLESPACE_NAME,
					"InnoDB: `%s` is a reserved"
					" tablespace name.",
					MYF(0), name);
				err = HA_WRONG_CREATE_OPTION;
			}
		} else {
			my_printf_error(ER_WRONG_TABLESPACE_NAME,
					"InnoDB: A general tablespace"
					" name cannot start with `%s`.",
					MYF(0), reserved_space_name_prefix);
			err = HA_WRONG_CREATE_OPTION;
		}
	}

	/* The tablespace name cannot contain a '/'. */
	if (memchr(name, '/', strlen(name)) != NULL) {
		my_printf_error(ER_WRONG_TABLESPACE_NAME,
			"InnoDB: A general tablespace name cannot"
			" contain '/'.", MYF(0));
		err = HA_WRONG_CREATE_OPTION;
	}

	return(err);
}

/** Validate TABLESPACE option.
@return true if valid, false if not. */
bool
create_table_info_t::create_option_tablespace_is_valid()
{
	ut_ad(m_use_shared_space);

	if (0 != validate_tablespace_name(m_create_info->tablespace, true)) {
		return(false);
	}

	/* Look up the tablespace name in the fil_system. */
	ulint	space_id = fil_space_get_id_by_name(
		m_create_info->tablespace);

	if (space_id == ULINT_UNDEFINED) {
		my_printf_error(ER_TABLESPACE_MISSING,
			"InnoDB: A general tablespace named"
			" `%s` cannot be found.", MYF(0),
			m_create_info->tablespace);
		return(false);
	}

	/* Cannot add a second table to a file-per-table tablespace. */
	ulint	fsp_flags = fil_space_get_flags(space_id);
	if (fsp_is_file_per_table(space_id, fsp_flags)) {
		my_printf_error(ER_ILLEGAL_HA_CREATE_OPTION,
			"InnoDB: Tablespace `%s` is file-per-table so no"
			" other table can be added to it.", MYF(0),
			m_create_info->tablespace);
		return(false);
	}

	/* If TABLESPACE=innodb_file_per_table this function is not called
	since tablespace_is_shared_space() will return false.  Any other
	tablespace is incompatible with the DATA DIRECTORY phrase.
	On any ALTER TABLE that contains a DATA DIRECTORY, MySQL will issue
	a warning like "<DATA DIRECTORY> option ignored." The check below is
	needed for CREATE TABLE only. ALTER TABLE may be moving remote
	file-per-table table to a general tablespace, in which case the
	create_info->data_file_name is not null. */
	bool	is_create_table = (thd_sql_command(m_thd) == SQLCOM_CREATE_TABLE);
	if (is_create_table
	    && m_create_info->data_file_name != NULL
	    && m_create_info->data_file_name[0] != '\0') {
		my_printf_error(ER_ILLEGAL_HA_CREATE_OPTION,
			"InnoDB: DATA DIRECTORY cannot be used"
			" with a TABLESPACE assignment.", MYF(0));
		return(false);
	}

	/* Temp tables only belong in temp tablespaces. */
	if (m_create_info->options & HA_LEX_CREATE_TMP_TABLE) {
		if (!FSP_FLAGS_GET_TEMPORARY(fsp_flags)) {
			my_printf_error(ER_ILLEGAL_HA_CREATE_OPTION,
				"InnoDB: Tablespace `%s` cannot contain"
				" TEMPORARY tables.", MYF(0),
				m_create_info->tablespace);
			return(false);
		}

		/* Restrict Compressed Temporary General tablespaces. */
		if (m_create_info->key_block_size
		    || m_create_info->row_type == ROW_TYPE_COMPRESSED) {
			my_printf_error(ER_ILLEGAL_HA_CREATE_OPTION,
				"InnoDB: Temporary tablespace `%s` cannot"
				" contain COMPRESSED tables.", MYF(0),
				m_create_info->tablespace);
			return(false);
		}
	} else if (FSP_FLAGS_GET_TEMPORARY(fsp_flags)) {
		my_printf_error(ER_ILLEGAL_HA_CREATE_OPTION,
			"InnoDB: Tablespace `%s` can only contain"
			" TEMPORARY tables.", MYF(0),
			m_create_info->tablespace);
		return(false);
	}

	/* Make sure the physical page size of the table matches the
	file block size of the tablespace. */
	ulint	block_size_needed;
	bool	table_is_compressed;
	if (m_create_info->key_block_size) {
		block_size_needed = m_create_info->key_block_size * 1024;
		table_is_compressed = true;
	} else if (m_create_info->row_type == ROW_TYPE_COMPRESSED) {
		block_size_needed = ut_min(
			UNIV_PAGE_SIZE / 2,
			static_cast<ulint>(UNIV_ZIP_SIZE_MAX));
		table_is_compressed = true;
	} else {
		block_size_needed = UNIV_PAGE_SIZE;
		table_is_compressed = false;
	}

	const page_size_t	page_size(fsp_flags);

	/* The compression code needs some work in order for a general
	tablespace to contain both compressed and non-compressed tables
	together in the same tablespace.  The problem seems to be that
	each page is either compressed or not based on the fsp flags,
	which is shared by all tables in that general tablespace. */
	if (table_is_compressed && page_size.physical() == UNIV_PAGE_SIZE) {
		my_printf_error(ER_ILLEGAL_HA_CREATE_OPTION,
			"InnoDB: Tablespace `%s` cannot contain a"
			" COMPRESSED table", MYF(0),
			m_create_info->tablespace);
		return(false);
	}

	if (block_size_needed != page_size.physical()) {
		my_printf_error(ER_ILLEGAL_HA_CREATE_OPTION,
			"InnoDB: Tablespace `%s` uses block size " ULINTPF
			" and cannot contain a table with physical"
			" page size " ULINTPF, MYF(0),
			m_create_info->tablespace,
			page_size.physical(),
			block_size_needed);
		return(false);
	}

	return(true);
}

/** Validate the create options. Check that the options KEY_BLOCK_SIZE,
ROW_FORMAT, DATA DIRECTORY, TEMPORARY & TABLESPACE are compatible with
each other and other settings.  These CREATE OPTIONS are not validated
here unless innodb_strict_mode is on. With strict mode, this function
will report each problem it finds using a custom message with error
code ER_ILLEGAL_HA_CREATE_OPTION, not its built-in message.
@return NULL if valid, string name of bad option if not. */
const char*
create_table_info_t::create_options_are_invalid()
{
	bool	has_key_block_size = (m_create_info->key_block_size != 0);

	const char*	ret = NULL;
	enum row_type	row_format	= m_create_info->row_type;

	ut_ad(m_thd != NULL);
	ut_ad(m_create_info != NULL);

	/* The TABLESPACE designation on a CREATE TABLE is not subject to
	non-strict-mode.  If it is incorrect or is incompatible with other
	options, then we will return an error. Make sure the tablespace exists
	and is compatible with this table */
	if (m_use_shared_space
	    && !create_option_tablespace_is_valid()) {
		return("TABLESPACE");
	}

	/* If innodb_strict_mode is not set don't do any more validation. */
	if (!m_use_shared_space && !(THDVAR(m_thd, strict_mode))) {
		return(NULL);
	}

	/* First check if a non-zero KEY_BLOCK_SIZE was specified. */
	if (has_key_block_size) {
		switch (m_create_info->key_block_size) {
			ulint	kbs_max;
		case 1:
		case 2:
		case 4:
		case 8:
		case 16:
			/* The maximum KEY_BLOCK_SIZE (KBS) is
			UNIV_PAGE_SIZE_MAX. But if UNIV_PAGE_SIZE is
			smaller than UNIV_PAGE_SIZE_MAX, the maximum
			KBS is also smaller. */
			kbs_max = ut_min(
				1 << (UNIV_PAGE_SSIZE_MAX - 1),
				1 << (PAGE_ZIP_SSIZE_MAX - 1));
			if (m_create_info->key_block_size > kbs_max) {
				push_warning_printf(
					m_thd, Sql_condition::SL_WARNING,
					ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: KEY_BLOCK_SIZE=%ld"
					" cannot be larger than %ld.",
					m_create_info->key_block_size,
					kbs_max);
				ret = "KEY_BLOCK_SIZE";
			}

			/* The following checks do not appy to shared tablespaces */
			if (m_use_shared_space) {
				break;
			}

			/* Valid KEY_BLOCK_SIZE, check its dependencies. */
			if (!m_allow_file_per_table) {
				push_warning(
					m_thd, Sql_condition::SL_WARNING,
					ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: KEY_BLOCK_SIZE requires"
					" innodb_file_per_table.");
				ret = "KEY_BLOCK_SIZE";
			}
			if (srv_file_format < UNIV_FORMAT_B) {
				push_warning(
					m_thd, Sql_condition::SL_WARNING,
					ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: KEY_BLOCK_SIZE requires"
					" innodb_file_format > Antelope.");
				ret = "KEY_BLOCK_SIZE";
			}
			break;
		default:
			push_warning_printf(
				m_thd, Sql_condition::SL_WARNING,
				ER_ILLEGAL_HA_CREATE_OPTION,
				"InnoDB: invalid KEY_BLOCK_SIZE = %lu."
				" Valid values are [1, 2, 4, 8, 16]",
				m_create_info->key_block_size);
			ret = "KEY_BLOCK_SIZE";
			break;
		}
	}

	/* Check for a valid InnoDB ROW_FORMAT specifier and
	other incompatibilities. */
	switch (row_format) {
	case ROW_TYPE_COMPRESSED:
		if (!m_use_shared_space) {
			if (!m_allow_file_per_table) {
				push_warning_printf(
					m_thd, Sql_condition::SL_WARNING,
					ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: ROW_FORMAT=%s requires"
					" innodb_file_per_table.",
					get_row_format_name(row_format));
				ret = "ROW_FORMAT";
			}
			if (srv_file_format < UNIV_FORMAT_B) {
				push_warning_printf(
					m_thd, Sql_condition::SL_WARNING,
					ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: ROW_FORMAT=%s requires"
					" innodb_file_format > Antelope.",
					get_row_format_name(row_format));
				ret = "ROW_FORMAT";
			}
		}
		break;
	case ROW_TYPE_DYNAMIC:
	case ROW_TYPE_COMPACT:
	case ROW_TYPE_REDUNDANT:
		if (has_key_block_size) {
			push_warning_printf(
				m_thd, Sql_condition::SL_WARNING,
				ER_ILLEGAL_HA_CREATE_OPTION,
				"InnoDB: cannot specify ROW_FORMAT = %s"
				" with KEY_BLOCK_SIZE.",
				get_row_format_name(row_format));
			ret = "KEY_BLOCK_SIZE";
		}
		break;
	case ROW_TYPE_DEFAULT:
		break;
	case ROW_TYPE_FIXED:
	case ROW_TYPE_PAGE:
	case ROW_TYPE_NOT_USED:
	default:
		push_warning(
			m_thd, Sql_condition::SL_WARNING,
			ER_ILLEGAL_HA_CREATE_OPTION,
			"InnoDB: invalid ROW_FORMAT specifier.");
		ret = "ROW_TYPE";
		break;
	}

	if (m_create_info->data_file_name
	    && m_create_info->data_file_name[0] != '\0'
	    && !create_option_data_directory_is_valid()) {
		ret = "DATA DIRECTORY";
	}

	/* Do not allow INDEX_DIRECTORY */
	if (m_create_info->index_file_name) {
		push_warning_printf(
			m_thd, Sql_condition::SL_WARNING,
			ER_ILLEGAL_HA_CREATE_OPTION,
			"InnoDB: INDEX DIRECTORY is not supported");
		ret = "INDEX DIRECTORY";
	}

	/* Don't support compressed table when page size > 16k. */
	if ((has_key_block_size || row_format == ROW_TYPE_COMPRESSED)
	    && UNIV_PAGE_SIZE > UNIV_PAGE_SIZE_DEF) {
		push_warning(m_thd, Sql_condition::SL_WARNING,
			     ER_ILLEGAL_HA_CREATE_OPTION,
			     "InnoDB: Cannot create a COMPRESSED table"
			     " when innodb_page_size > 16k.");

		if (has_key_block_size) {
			ret = "KEY_BLOCK_SIZE";
		} else {
			ret = "ROW_TYPE";
		}
	}

	/* Note: Currently the max length is 4: ZLIB, LZ4, NONE. */

	if (ret == NULL && m_create_info->compress.length > 0) {

		dberr_t		err;
		Compression	compression;

		err = Compression::check(
			m_create_info->compress.str, &compression);

		if (err == DB_UNSUPPORTED) {

			push_warning_printf(
				m_thd,
				Sql_condition::SL_WARNING,
				ER_UNSUPPORTED_EXTENSION,
				"InnoDB: Unsupported compression algorithm '"
				"%s'",
				m_create_info->compress.str);

			ret = "COMPRESSION";

		} else if (m_create_info->key_block_size > 0
			   && compression.m_type != Compression::NONE) {

			push_warning_printf(
				m_thd,
				Sql_condition::SL_WARNING,
				ER_UNSUPPORTED_EXTENSION,
				"InnODB: Attribute not supported with row "
				"format compressed or key block size > 0");

			ret = "COMPRESSION";
		}
	}

	/* Check the encryption option. */
	if (ret == NULL && m_create_info->encrypt_type.length > 0) {
		dberr_t		err;

		err = Encryption::validate(m_create_info->encrypt_type.str);

		if (err == DB_UNSUPPORTED) {
                        my_error(ER_INVALID_ENCRYPTION_OPTION, MYF(0));
			ret = "ENCRYPTION";
		}
	}

	return(ret);
}

/*****************************************************************//**
Update create_info.  Used in SHOW CREATE TABLE et al. */

void
ha_innobase::update_create_info(
/*============================*/
	HA_CREATE_INFO*	create_info)	/*!< in/out: create info */
{
	if (!(create_info->used_fields & HA_CREATE_USED_AUTO)) {
		info(HA_STATUS_AUTO);
		create_info->auto_increment_value = stats.auto_increment_value;
	}

	/* Update the DATA DIRECTORY name from SYS_DATAFILES. */
	dict_get_and_save_data_dir_path(m_prebuilt->table, false);

	if (m_prebuilt->table->data_dir_path) {
		create_info->data_file_name = m_prebuilt->table->data_dir_path;
	}

	/* Update the TABLESPACE name from the Data Dictionary. */
	dict_get_and_save_space_name(m_prebuilt->table, false);

	/* Put this tablespace name into the create_info structure so that
	SHOW CREATE TABLE will display TABLESPACE=name.  This also affects
	an ALTER TABLE which must know the current TABLESPACE so that the
	table will stay there. */
	if (m_prebuilt->table->tablespace != NULL
	    && create_info->tablespace == NULL) {
		create_info->tablespace = m_prebuilt->table->tablespace;
	}
}

/*****************************************************************//**
Initialize the table FTS stopword list
@return TRUE if success */
ibool
innobase_fts_load_stopword(
/*=======================*/
	dict_table_t*	table,	/*!< in: Table has the FTS */
	trx_t*		trx,	/*!< in: transaction */
	THD*		thd)	/*!< in: current thread */
{
	return(fts_load_stopword(table, trx,
				 innobase_server_stopword_table,
				 THDVAR(thd, ft_user_stopword_table),
				 THDVAR(thd, ft_enable_stopword), FALSE));
}

/** Parse the table name into normal name and either temp path or remote path
if needed.
@param[in]	name	Table name (db/table or full path).
@return 0 if successful, otherwise, error number */
int
create_table_info_t::parse_table_name(
	const char*		name)
{
	DBUG_ENTER("parse_table_name");

#ifdef _WIN32
	/* Names passed in from server are in two formats:
	1. <database_name>/<table_name>: for normal table creation
	2. full path: for temp table creation, or DATA DIRECTORY.

	When srv_file_per_table is on and mysqld_embedded is off,
	check for full path pattern, i.e.
	X:\dir\...,		X is a driver letter, or
	\\dir1\dir2\...,	UNC path
	returns error if it is in full path format, but not creating a temp.
	table. Currently InnoDB does not support symbolic link on Windows. */

	if (m_innodb_file_per_table
	    && !mysqld_embedded
	    && !(m_create_info->options & HA_LEX_CREATE_TMP_TABLE)) {

		if ((name[1] == ':')
		    || (name[0] == '\\' && name[1] == '\\')) {
			sql_print_error("Cannot create table %s\n", name);
			DBUG_RETURN(HA_ERR_GENERIC);
		}
	}
#endif

	m_temp_path[0] = '\0';
	m_remote_path[0] = '\0';
	m_tablespace[0] = '\0';

	/* A full path is provided by the server for TEMPORARY tables not
	targeted for a tablespace or when DATA DIRECTORY is given.
	So these two are not compatible.  Likewise, DATA DIRECTORY is not
	compatible with a TABLESPACE assignment. */
	if ((m_create_info->options & HA_LEX_CREATE_TMP_TABLE)
	    && !m_use_shared_space) {
		strncpy(m_temp_path, name, FN_REFLEN - 1);
	}

	/* Make sure DATA DIRECTORY is compatible with other options
	and set the remote path.  In the case of either;
	  CREATE TEMPORARY TABLE ... DATA DIRECTORY={path} ... ;
	  CREATE TABLE ... DATA DIRECTORY={path} TABLESPACE={name}... ;
	we ignore the DATA DIRECTORY. */
	if (m_create_info->data_file_name
	    && m_create_info->data_file_name[0] != '\0') {
		if (!create_option_data_directory_is_valid()) {
			push_warning_printf(
				m_thd, Sql_condition::SL_WARNING,
				WARN_OPTION_IGNORED,
				ER_DEFAULT(WARN_OPTION_IGNORED),
				"DATA DIRECTORY");
			m_flags &= ~DICT_TF_MASK_DATA_DIR;
		} else {
			strncpy(m_remote_path,
				m_create_info->data_file_name,
				FN_REFLEN - 1);
		}
	}

	if (m_create_info->index_file_name) {
		push_warning_printf(
			m_thd, Sql_condition::SL_WARNING,
			WARN_OPTION_IGNORED,
			ER_DEFAULT(WARN_OPTION_IGNORED),
			"INDEX DIRECTORY");
	}

	/* The TABLESPACE designation has already been validated by
	create_option_tablespace_is_valid() irregardless of strict-mode.
	So it only needs to be copied now. */
	if (m_use_shared_space) {
		strncpy(m_tablespace, m_create_info->tablespace,
			NAME_LEN - 1);
	}

	DBUG_RETURN(0);
}

/** Determine InnoDB table flags.
If strict_mode=OFF, this will adjust the flags to what should be assumed.
However, if an existing general tablespace is being targeted, we will NOT
assume anything or adjust these flags.
@retval true if successful, false if error */
bool
create_table_info_t::innobase_table_flags()
{
	DBUG_ENTER("innobase_table_flags");

	const char*	fts_doc_id_index_bad = NULL;
	bool		zip_allowed = true;
	ulint		zip_ssize = 0;
	enum row_type	row_type;
	rec_format_t	innodb_row_format =
		get_row_format(innodb_default_row_format);

	const ulint	zip_ssize_max =
		ut_min(static_cast<ulint>(UNIV_PAGE_SSIZE_MAX),
		       static_cast<ulint>(PAGE_ZIP_SSIZE_MAX));

	/* Cache the value of innodb_file_format, in case it is
	modified by another thread while the table is being created. */
	const ulint	file_format_allowed = srv_file_format;

	m_flags = 0;
	m_flags2 = 0;

	/* Check if there are any FTS indexes defined on this table. */
	for (uint i = 0; i < m_form->s->keys; i++) {
		const KEY*	key = &m_form->key_info[i];

		if (key->flags & HA_FULLTEXT) {
			m_flags2 |= DICT_TF2_FTS;

			/* We don't support FTS indexes in temporary
			tables. */
			if (m_create_info->options & HA_LEX_CREATE_TMP_TABLE) {

				my_error(ER_INNODB_NO_FT_TEMP_TABLE, MYF(0));
				DBUG_RETURN(false);
			}

			if (fts_doc_id_index_bad) {
				goto index_bad;
			}
		} else if (key->flags & HA_SPATIAL) {
			if (m_create_info->options & HA_LEX_CREATE_TMP_TABLE
			    && m_create_info->options
			       & HA_LEX_CREATE_INTERNAL_TMP_TABLE
			    && !m_use_file_per_table) {
				my_error(ER_TABLE_CANT_HANDLE_SPKEYS, MYF(0));
				DBUG_RETURN(false);
			}
		}

		if (innobase_strcasecmp(key->name, FTS_DOC_ID_INDEX_NAME)) {
			continue;
		}

		/* Do a pre-check on FTS DOC ID index */
		if (!(key->flags & HA_NOSAME)
		    || strcmp(key->name, FTS_DOC_ID_INDEX_NAME)
		    || strcmp(key->key_part[0].field->field_name,
			      FTS_DOC_ID_COL_NAME)) {
			fts_doc_id_index_bad = key->name;
		}

		if (fts_doc_id_index_bad && (m_flags2 & DICT_TF2_FTS)) {
index_bad:
			my_error(ER_INNODB_FT_WRONG_DOCID_INDEX, MYF(0),
				 fts_doc_id_index_bad);
			DBUG_RETURN(false);
		}
	}

	if (m_create_info->key_block_size > 0) {
		/* The requested compressed page size (key_block_size)
		is given in kilobytes. If it is a valid number, store
		that value as the number of log2 shifts from 512 in
		zip_ssize. Zero means it is not compressed. */
		ulint	zssize;		/* Zip Shift Size */
		ulint	kbsize;		/* Key Block Size */
		for (zssize = kbsize = 1;
		     zssize <= zip_ssize_max;
		     zssize++, kbsize <<= 1) {
			if (kbsize == m_create_info->key_block_size) {
				zip_ssize = zssize;
				break;
			}
		}

		/* Make sure compressed row format is allowed. */
		if (!m_allow_file_per_table && !m_use_shared_space) {
			push_warning(
				m_thd, Sql_condition::SL_WARNING,
				ER_ILLEGAL_HA_CREATE_OPTION,
				"InnoDB: KEY_BLOCK_SIZE requires"
				" innodb_file_per_table.");
			zip_allowed = false;
		}

		if (file_format_allowed < UNIV_FORMAT_B
		    && !m_use_shared_space) {
			push_warning(
				m_thd, Sql_condition::SL_WARNING,
				ER_ILLEGAL_HA_CREATE_OPTION,
				"InnoDB: KEY_BLOCK_SIZE requires"
				" innodb_file_format > Antelope.");
			zip_allowed = false;
		}

		if (!zip_allowed
		    || zssize > zip_ssize_max) {
			push_warning_printf(
				m_thd, Sql_condition::SL_WARNING,
				ER_ILLEGAL_HA_CREATE_OPTION,
				"InnoDB: ignoring KEY_BLOCK_SIZE=%lu.",
				m_create_info->key_block_size);
		}

	} else if (m_create_info->compress.length > 0) {

		if (m_use_shared_space
		    || (m_create_info->options & HA_LEX_CREATE_TMP_TABLE)) {

			push_warning_printf(
				m_thd,
				Sql_condition::SL_WARNING,
				HA_ERR_UNSUPPORTED,
				"InnoDB: Cannot compress pages of shared "
				"tablespaces");
		}

		const char*     compression = m_create_info->compress.str;

		if (Compression::validate(compression) != DB_SUCCESS) {

			push_warning_printf(
				m_thd,
				Sql_condition::SL_WARNING,
				HA_ERR_UNSUPPORTED,
				"InnoDB: Unsupported compression "
				"algorithm '%s'",
				compression);
		}

	} else if (m_create_info->encrypt_type.length > 0) {

		const char*     encryption = m_create_info->encrypt_type.str;

		if (Encryption::validate(encryption) != DB_SUCCESS) {
			/* Incorrect encryption option */
                        my_error(ER_INVALID_ENCRYPTION_OPTION, MYF(0));
			DBUG_RETURN(false);
		}

		if (m_use_shared_space
		    || (m_create_info->options & HA_LEX_CREATE_TMP_TABLE)) {
			if (!Encryption::is_none(encryption)) {
				/* Can't encrypt shared tablespace */
				my_error(ER_TABLESPACE_CANNOT_ENCRYPT, MYF(0));
				DBUG_RETURN(false);
			}
		}
	}

	row_type = m_form->s->row_type;

	if (zip_ssize && zip_allowed) {
		/* if ROW_FORMAT is set to default,
		automatically change it to COMPRESSED. */
		if (row_type == ROW_TYPE_DEFAULT) {
			row_type = ROW_TYPE_COMPRESSED;
		} else if (row_type != ROW_TYPE_COMPRESSED) {
			/* ROW_FORMAT other than COMPRESSED
			ignores KEY_BLOCK_SIZE.  It does not
			make sense to reject conflicting
			KEY_BLOCK_SIZE and ROW_FORMAT, because
			such combinations can be obtained
			with ALTER TABLE anyway. */
			push_warning_printf(
				m_thd, Sql_condition::SL_WARNING,
				ER_ILLEGAL_HA_CREATE_OPTION,
				"InnoDB: ignoring KEY_BLOCK_SIZE=%lu"
				" unless ROW_FORMAT=COMPRESSED.",
				m_create_info->key_block_size);
			zip_allowed = false;
		}
	} else {
		/* zip_ssize == 0 means no KEY_BLOCK_SIZE. */
		if (row_type == ROW_TYPE_COMPRESSED && zip_allowed) {
			/* ROW_FORMAT=COMPRESSED without KEY_BLOCK_SIZE
			implies half the maximum KEY_BLOCK_SIZE(*1k) or
			UNIV_PAGE_SIZE, whichever is less. */
			zip_ssize = zip_ssize_max - 1;
		}
	}

	/* Validate the row format.  Correct it if necessary */

	switch (row_type) {
	case ROW_TYPE_REDUNDANT:
		innodb_row_format = REC_FORMAT_REDUNDANT;
		break;
	case ROW_TYPE_COMPACT:
		innodb_row_format = REC_FORMAT_COMPACT;
		break;

	case ROW_TYPE_COMPRESSED:
		/* ROW_FORMAT=COMPRESSED requires file_per_table and
		file_format=Barracuda unless there is a target tablespace. */
		if (!m_allow_file_per_table
		    && !m_use_shared_space) {
			push_warning_printf(
				m_thd, Sql_condition::SL_WARNING,
				ER_ILLEGAL_HA_CREATE_OPTION,
				"InnoDB: ROW_FORMAT=COMPRESSED requires"
				" innodb_file_per_table.");

		} else if (file_format_allowed == UNIV_FORMAT_A
			   && !m_use_shared_space) {
			push_warning_printf(
				m_thd, Sql_condition::SL_WARNING,
				ER_ILLEGAL_HA_CREATE_OPTION,
				"InnoDB: ROW_FORMAT=COMPRESSED requires"
				" innodb_file_format > Antelope.");

		} else {
			/* We can use this row_format. */
			innodb_row_format = REC_FORMAT_COMPRESSED;
			break;
		}
		zip_allowed = false;
		/* fall through to set row_type = DYNAMIC */
	case ROW_TYPE_NOT_USED:
	case ROW_TYPE_FIXED:
	case ROW_TYPE_PAGE:
	default:
		push_warning(
			m_thd, Sql_condition::SL_WARNING,
			ER_ILLEGAL_HA_CREATE_OPTION,
			"InnoDB: assuming ROW_FORMAT=DYNAMIC.");
	case ROW_TYPE_DYNAMIC:
		innodb_row_format = REC_FORMAT_DYNAMIC;
		break;
	case ROW_TYPE_DEFAULT:
		;
	}

	/* Don't support compressed table when page size > 16k. */
	if (zip_allowed && zip_ssize && UNIV_PAGE_SIZE > UNIV_PAGE_SIZE_DEF) {
		push_warning(m_thd, Sql_condition::SL_WARNING,
			     ER_ILLEGAL_HA_CREATE_OPTION,
			     "InnoDB: Cannot create a COMPRESSED table"
			     " when innodb_page_size > 16k."
			     " Assuming ROW_FORMAT=DYNAMIC.");
		zip_allowed = false;
	}

	/* Set the table flags */
	if (!zip_allowed) {
		zip_ssize = 0;
	}

	if (m_create_info->options & HA_LEX_CREATE_TMP_TABLE) {
		m_flags2 |= DICT_TF2_TEMPORARY;

		/* Intrinsic tables reside only in the shared temporary
		tablespace and we will always use ROW_FORMAT=DYNAMIC. */
		if ((m_create_info->options & HA_LEX_CREATE_INTERNAL_TMP_TABLE)
		    && !m_use_file_per_table) {
			/* We do not allow compressed instrinsic
			temporary tables. */
			ut_ad(zip_ssize == 0);
			m_flags2 |= DICT_TF2_INTRINSIC;
			innodb_row_format = REC_FORMAT_DYNAMIC;
		}
	}

	/* Set the table flags */
	dict_tf_set(&m_flags, innodb_row_format, zip_ssize,
	            m_use_data_dir, m_use_shared_space);

	if (m_use_file_per_table) {
		ut_ad(!m_use_shared_space);
		m_flags2 |= DICT_TF2_USE_FILE_PER_TABLE;
	}

	/* Set the flags2 when create table or alter tables */
	m_flags2 |= DICT_TF2_FTS_AUX_HEX_NAME;
	DBUG_EXECUTE_IF("innodb_test_wrong_fts_aux_table_name",
			m_flags2 &= ~DICT_TF2_FTS_AUX_HEX_NAME;);

	DBUG_RETURN(true);
}

/** Parse MERGE_THRESHOLD value from the string.
@param[in]	thd	connection
@param[in]	str	string which might include 'MERGE_THRESHOLD='
@return	value parsed. 0 means not found or invalid value. */
static
ulint
innobase_parse_merge_threshold(
	THD*		thd,
	const char*	str)
{
	static const char*	label = "MERGE_THRESHOLD=";
	static const size_t	label_len = strlen(label);
	const char*		pos = str;

	pos = strstr(str, label);

	if (pos == NULL) {
		return(0);
	}

	pos += label_len;

	lint	ret = atoi(pos);

	if (ret > 0 && ret <= 50) {
		return(static_cast<ulint>(ret));
	}

	push_warning_printf(
		thd, Sql_condition::SL_WARNING,
		ER_ILLEGAL_HA_CREATE_OPTION,
		"InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE"
		" statement. The value is ignored.");

	return(0);
}

/** Parse hint for table and its indexes, and update the information
in dictionary.
@param[in]	thd		connection
@param[in,out]	table		target table
@param[in]	table_share	table definition */
void
innobase_parse_hint_from_comment(
	THD*			thd,
	dict_table_t*		table,
	const TABLE_SHARE*	table_share)
{
	ulint	merge_threshold_table;
	ulint	merge_threshold_index[MAX_KEY];
	bool	is_found[MAX_KEY];

	if (table_share->comment.str != NULL) {
		merge_threshold_table
			= innobase_parse_merge_threshold(
				thd, table_share->comment.str);
	} else {
		merge_threshold_table = DICT_INDEX_MERGE_THRESHOLD_DEFAULT;
	}

	if (merge_threshold_table == 0) {
		merge_threshold_table = DICT_INDEX_MERGE_THRESHOLD_DEFAULT;
	}

	for (uint i = 0; i < table_share->keys; i++) {
		KEY*	key_info = &table_share->key_info[i];

		ut_ad(i < sizeof(merge_threshold_index)
			  / sizeof(merge_threshold_index[0]));

		if (key_info->flags & HA_USES_COMMENT
		    && key_info->comment.str != NULL) {
			merge_threshold_index[i]
				= innobase_parse_merge_threshold(
					thd, key_info->comment.str);
		} else {
			merge_threshold_index[i] = merge_threshold_table;
		}

		if (merge_threshold_index[i] == 0) {
			merge_threshold_index[i] = merge_threshold_table;
		}
	}

	/* update SYS_INDEX table */
	if (!dict_table_is_temporary(table)) {
		for (uint i = 0; i < table_share->keys; i++) {
			is_found[i] = false;
		}

		for (dict_index_t* index = UT_LIST_GET_FIRST(table->indexes);
		     index != NULL;
		     index = UT_LIST_GET_NEXT(indexes, index)) {

			if (dict_index_is_auto_gen_clust(index)) {

				/* GEN_CLUST_INDEX should use
				merge_threshold_table */
				dict_index_set_merge_threshold(
					index, merge_threshold_table);
				continue;
			}

			for (uint i = 0; i < table_share->keys; i++) {
				if (is_found[i]) {
					continue;
				}

				KEY*	key_info = &table_share->key_info[i];

				if (innobase_strcasecmp(
					index->name, key_info->name) == 0) {

					dict_index_set_merge_threshold(
						index,
						merge_threshold_index[i]);
					is_found[i] = true;
					break;
				}
			}
		}
	}

	for (uint i = 0; i < table_share->keys; i++) {
		is_found[i] = false;
	}

	/* update in memory */
	for (dict_index_t* index = UT_LIST_GET_FIRST(table->indexes);
	     index != NULL;
	     index = UT_LIST_GET_NEXT(indexes, index)) {

		if (dict_index_is_auto_gen_clust(index)) {

			/* GEN_CLUST_INDEX should use merge_threshold_table */

			/* x-lock index is needed to exclude concurrent
			pessimistic tree operations */
			rw_lock_x_lock(dict_index_get_lock(index));
			index->merge_threshold = merge_threshold_table;
			rw_lock_x_unlock(dict_index_get_lock(index));

			continue;
		}

		for (uint i = 0; i < table_share->keys; i++) {
			if (is_found[i]) {
				continue;
			}

			KEY*	key_info = &table_share->key_info[i];

			if (innobase_strcasecmp(
				index->name, key_info->name) == 0) {

				/* x-lock index is needed to exclude concurrent
				pessimistic tree operations */
				rw_lock_x_lock(dict_index_get_lock(index));
				index->merge_threshold
					= merge_threshold_index[i];
				rw_lock_x_unlock(dict_index_get_lock(index));
				is_found[i] = true;

				break;
			}
		}
	}
}

/** Set m_use_* flags. */
void
create_table_info_t::set_tablespace_type(
	bool	table_being_altered_is_file_per_table)
{
	/* Note whether this table will be created using a shared,
	general or system tablespace. */
	m_use_shared_space = tablespace_is_shared_space(m_create_info);

	/** Allow file_per_table for this table either because:
	1) the setting innodb_file_per_table=on,
	2) the table being altered is currently file_per_table
	3) explicitly requested by tablespace=innodb_file_per_table. */
	m_allow_file_per_table =
		m_innodb_file_per_table
		|| table_being_altered_is_file_per_table
		|| tablespace_is_file_per_table(m_create_info);

	/* All noncompresed temporary tables will be put into the
	system temporary tablespace.  */
	bool is_noncompressed_temporary =
		m_create_info->options & HA_LEX_CREATE_TMP_TABLE
		&& !(m_create_info->row_type == ROW_TYPE_COMPRESSED
		     || m_create_info->key_block_size > 0);

	/* Ignore the current innodb-file-per-table setting if we are
	creating a temporary, non-compressed table or if the
	TABLESPACE= phrase is using an existing shared tablespace. */
	m_use_file_per_table =
		m_allow_file_per_table
		&& !is_noncompressed_temporary
		&& !m_use_shared_space;

	/* DATA DIRECTORY must have m_use_file_per_table but cannot be
	used with TEMPORARY tables. */
	m_use_data_dir =
		m_use_file_per_table
		&& !(m_create_info->options & HA_LEX_CREATE_TMP_TABLE)
		&& (m_create_info->data_file_name != NULL)
		&& (m_create_info->data_file_name[0] != '\0');
	ut_ad(!(m_use_shared_space && m_use_data_dir));
}

/** Initialize the create_table_info_t object.
@return error number */
int
create_table_info_t::initialize()
{
	trx_t*		parent_trx;

	DBUG_ENTER("create_table_info_t::initialize");

	ut_ad(m_thd != NULL);
	ut_ad(m_create_info != NULL);

	if (m_form->s->fields > REC_MAX_N_USER_FIELDS) {
		DBUG_RETURN(HA_ERR_TOO_MANY_FIELDS);
	}

	ut_ad(m_form->s->row_type == m_create_info->row_type);

	/* Check for name conflicts (with reserved name) for
	any user indices to be created. */
	if (innobase_index_name_is_reserved(m_thd, m_form->key_info,
					    m_form->s->keys)) {
		DBUG_RETURN(HA_ERR_WRONG_INDEX);
	}

	/* Get the transaction associated with the current thd, or create one
	if not yet created */

	parent_trx = check_trx_exists(m_thd);

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(parent_trx);
	DBUG_RETURN(0);
}


/** Prepare to create a new table to an InnoDB database.
@param[in]	name	Table name
@return error number */
int
create_table_info_t::prepare_create_table(
	const char*		name)
{
	DBUG_ENTER("prepare_create_table");

	ut_ad(m_thd != NULL);
	ut_ad(m_create_info != NULL);

	ut_ad(m_form->s->row_type == m_create_info->row_type);

	set_tablespace_type(false);

	normalize_table_name(m_table_name, name);

	/* Validate the create options if innodb_strict_mode is set.
	Do not use the regular message for ER_ILLEGAL_HA_CREATE_OPTION
	because InnoDB might actually support the option, but not under
	the current conditions.  The messages revealing the specific
	problems are reported inside this function. */
	if (create_options_are_invalid()) {
		DBUG_RETURN(HA_WRONG_CREATE_OPTION);
	}

	/* Create the table flags and flags2 */
	if (!innobase_table_flags()) {
		DBUG_RETURN(HA_WRONG_CREATE_OPTION);
	}

	if (high_level_read_only && !is_intrinsic_temp_table()) {
		DBUG_RETURN(HA_ERR_INNODB_READ_ONLY);
	}

	DBUG_RETURN(parse_table_name(name));
}

/** Create a new table to an InnoDB database.
@return error number */
int
create_table_info_t::create_table()
{
	int		error;
	int		primary_key_no;
	uint		i;
	dict_table_t*	innobase_table = NULL;
	const char*	stmt;
	size_t		stmt_len;

	DBUG_ENTER("create_table");

	/* Look for a primary key */
	primary_key_no = (m_form->s->primary_key != MAX_KEY ?
			  (int) m_form->s->primary_key : -1);

	/* Our function innobase_get_mysql_key_number_for_index assumes
	the primary key is always number 0, if it exists */
	ut_a(primary_key_no == -1 || primary_key_no == 0);

	error = create_table_def();
	if (error) {
		DBUG_RETURN(error);
	}

	/* Create the keys */

	if (m_form->s->keys == 0 || primary_key_no == -1) {
		/* Create an index which is used as the clustered index;
		order the rows by their row id which is internally generated
		by InnoDB */

		error = create_clustered_index_when_no_primary(
			m_trx, m_flags, m_table_name);
		if (error) {
			DBUG_RETURN(error);
		}
	}

	if (primary_key_no != -1) {
		/* In InnoDB the clustered index must always be created
		first */
		if ((error = create_index(m_trx, m_form, m_flags, m_table_name,
					  (uint) primary_key_no))) {
			DBUG_RETURN(error);
		}
	}

	/* Create the ancillary tables that are common to all FTS indexes on
	this table. */
	if (m_flags2 & DICT_TF2_FTS) {
		fts_doc_id_index_enum	ret;

		innobase_table = dict_table_open_on_name(
			m_table_name, TRUE, FALSE, DICT_ERR_IGNORE_NONE);

		ut_a(innobase_table);

		/* Check whether there already exists FTS_DOC_ID_INDEX */
		ret = innobase_fts_check_doc_id_index_in_def(
			m_form->s->keys, m_form->key_info);

		switch (ret) {
		case FTS_INCORRECT_DOC_ID_INDEX:
			push_warning_printf(m_thd,
					    Sql_condition::SL_WARNING,
					    ER_WRONG_NAME_FOR_INDEX,
					    " InnoDB: Index name %s is reserved"
					    " for the unique index on"
					    " FTS_DOC_ID column for FTS"
					    " Document ID indexing"
					    " on table %s. Please check"
					    " the index definition to"
					    " make sure it is of correct"
					    " type\n",
					    FTS_DOC_ID_INDEX_NAME,
					    innobase_table->name.m_name);

			if (innobase_table->fts) {
				fts_free(innobase_table);
			}

			dict_table_close(innobase_table, TRUE, FALSE);
			my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0),
				 FTS_DOC_ID_INDEX_NAME);
			error = -1;
			DBUG_RETURN(error);
		case FTS_EXIST_DOC_ID_INDEX:
		case FTS_NOT_EXIST_DOC_ID_INDEX:
			break;
		}

		dberr_t	err = fts_create_common_tables(
			m_trx, innobase_table, m_table_name,
			(ret == FTS_EXIST_DOC_ID_INDEX));

		error = convert_error_code_to_mysql(err, 0, NULL);

		dict_table_close(innobase_table, TRUE, FALSE);

		if (error) {
			trx_rollback_to_savepoint(m_trx, NULL);
			m_trx->error_state = DB_SUCCESS;

			row_drop_table_for_mysql(m_table_name, m_trx, FALSE);

			m_trx->error_state = DB_SUCCESS;
			DBUG_RETURN(error);
		}
	}

	for (i = 0; i < m_form->s->keys; i++) {

		if (i != static_cast<uint>(primary_key_no)) {

			if ((error = create_index(m_trx, m_form, m_flags,
						  m_table_name, i))) {
				DBUG_RETURN(error);
			}
		}
	}

	/* Cache all the FTS indexes on this table in the FTS specific
	structure. They are used for FTS indexed column update handling. */
	if (m_flags2 & DICT_TF2_FTS) {
		fts_t*          fts = innobase_table->fts;

		ut_a(fts != NULL);

		dict_table_get_all_fts_indexes(innobase_table, fts->indexes);
	}

	stmt = innobase_get_stmt_unsafe(m_thd, &stmt_len);

	innodb_session_t*&	priv =
		thd_to_innodb_session(m_trx->mysql_thd);
	dict_table_t*		handler =
		priv->lookup_table_handler(m_table_name);

	ut_ad(handler == NULL
	      || (handler != NULL && dict_table_is_intrinsic(handler)));

	/* There is no concept of foreign key for intrinsic tables. */
	if (stmt && (handler == NULL)) {

		dberr_t	err = row_table_add_foreign_constraints(
			m_trx, stmt, stmt_len, m_table_name,
			m_create_info->options & HA_LEX_CREATE_TMP_TABLE);

		switch (err) {

		case DB_PARENT_NO_INDEX:
			push_warning_printf(
				m_thd, Sql_condition::SL_WARNING,
				HA_ERR_CANNOT_ADD_FOREIGN,
				"Create table '%s' with foreign key constraint"
				" failed. There is no index in the referenced"
				" table where the referenced columns appear"
				" as the first columns.\n", m_table_name);
			break;

		case DB_CHILD_NO_INDEX:
			push_warning_printf(
				m_thd, Sql_condition::SL_WARNING,
				HA_ERR_CANNOT_ADD_FOREIGN,
				"Create table '%s' with foreign key constraint"
				" failed. There is no index in the referencing"
				" table where referencing columns appear"
				" as the first columns.\n", m_table_name);
			break;
		case DB_NO_FK_ON_V_BASE_COL:
			push_warning_printf(
				m_thd, Sql_condition::SL_WARNING,
				HA_ERR_CANNOT_ADD_FOREIGN,
				"Create table '%s' with foreign key constraint"
				" failed. Cannot add foreign key constraint"
				" placed on the base column of indexed"
				" virtual column, or constraint placed"
				" on columns being part of virtual index.\n",
				m_table_name);
			break;
		default:
			break;
		}

		error = convert_error_code_to_mysql(err, m_flags, NULL);

		if (error) {
			if (handler != NULL) {
				priv->unregister_table_handler(m_table_name);
			}
			DBUG_RETURN(error);
		}
	}

	if (!is_intrinsic_temp_table()) {
		innobase_table = dict_table_open_on_name(
			m_table_name, TRUE, FALSE, DICT_ERR_IGNORE_NONE);

		if (innobase_table != NULL) {
			dict_table_close(innobase_table, TRUE, FALSE);
		}

	} else {
		innobase_table = NULL;
	}

	DBUG_RETURN(0);
}

/** Update a new table in an InnoDB database.
@return error number */
int
create_table_info_t::create_table_update_dict()
{
	dict_table_t*	innobase_table;

	DBUG_ENTER("create_table_update_dict");

	innobase_table = thd_to_innodb_session(m_thd)->lookup_table_handler(
		m_table_name);

	if (innobase_table == NULL) {
		innobase_table = dict_table_open_on_name(
			m_table_name, FALSE, FALSE, DICT_ERR_IGNORE_NONE);
	} else {
		innobase_table->acquire();
		ut_ad(dict_table_is_intrinsic(innobase_table));
	}

	DBUG_ASSERT(innobase_table != 0);
	if (innobase_table->fts != NULL) {
		if (innobase_table->fts_doc_id_index == NULL) {
			innobase_table->fts_doc_id_index
				= dict_table_get_index_on_name(
					innobase_table, FTS_DOC_ID_INDEX_NAME);
			DBUG_ASSERT(innobase_table->fts_doc_id_index != NULL);
		} else {
			DBUG_ASSERT(innobase_table->fts_doc_id_index
				    == dict_table_get_index_on_name(
						innobase_table,
						FTS_DOC_ID_INDEX_NAME));
		}
	}

	DBUG_ASSERT((innobase_table->fts == NULL)
		    == (innobase_table->fts_doc_id_index == NULL));

	innobase_copy_frm_flags_from_create_info(innobase_table, m_create_info);

	dict_stats_update(innobase_table, DICT_STATS_EMPTY_TABLE);

	if (innobase_table) {
		/* We update the highest file format in the system table
		space, if this table has higher file format setting. */

		trx_sys_file_format_max_upgrade(
			(const char**) &innobase_file_format_max,
			dict_table_get_format(innobase_table));
	}

	/* Load server stopword into FTS cache */
	if (m_flags2 & DICT_TF2_FTS) {
		if (!innobase_fts_load_stopword(innobase_table, NULL, m_thd)) {
			dict_table_close(innobase_table, FALSE, FALSE);
			srv_active_wake_master_thread();
			trx_free_for_mysql(m_trx);
			DBUG_RETURN(-1);
		}
	}

	/* Note: We can't call update_thd() as m_prebuilt will not be
	setup at this stage and so we use thd. */

	/* We need to copy the AUTOINC value from the old table if
	this is an ALTER|OPTIMIZE TABLE or CREATE INDEX because CREATE INDEX
	does a table copy too. If query was one of :

		CREATE TABLE ...AUTO_INCREMENT = x; or
		ALTER TABLE...AUTO_INCREMENT = x;   or
		OPTIMIZE TABLE t; or
		CREATE INDEX x on t(...);

	Find out a table definition from the dictionary and get
	the current value of the auto increment field. Set a new
	value to the auto increment field if the value is greater
	than the maximum value in the column. */

	if (((m_create_info->used_fields & HA_CREATE_USED_AUTO)
	     || thd_sql_command(m_thd) == SQLCOM_ALTER_TABLE
	     || thd_sql_command(m_thd) == SQLCOM_OPTIMIZE
	     || thd_sql_command(m_thd) == SQLCOM_CREATE_INDEX)
	    && m_create_info->auto_increment_value > 0) {
		ib_uint64_t	auto_inc_value;

		auto_inc_value = m_create_info->auto_increment_value;

		dict_table_autoinc_lock(innobase_table);
		dict_table_autoinc_initialize(innobase_table, auto_inc_value);
		dict_table_autoinc_unlock(innobase_table);
	}

	dict_table_close(innobase_table, FALSE, FALSE);

	innobase_parse_hint_from_comment(m_thd, innobase_table, m_form->s);

	DBUG_RETURN(0);
}

/** Allocate a new trx. */
void
create_table_info_t::allocate_trx()
{
	m_trx = innobase_trx_allocate(m_thd);

	m_trx->will_lock++;
	m_trx->ddl = true;
}

/** Create a new table to an InnoDB database.
@param[in]	name		Table name, format: "db/table_name".
@param[in]	form		Table format; columns and index information.
@param[in]	create_info	Create info (including create statement string).
@return	0 if success else error number. */
int
ha_innobase::create(
	const char*	name,
	TABLE*		form,
	HA_CREATE_INFO*	create_info)
{
	int		error;
	char		norm_name[FN_REFLEN];	/* {database}/{tablename} */
	char		temp_path[FN_REFLEN];	/* Absolute path of temp frm */
	char		remote_path[FN_REFLEN];	/* Absolute path of table */
	char		tablespace[NAME_LEN];	/* Tablespace name identifier */
	trx_t*		trx;
	DBUG_ENTER("ha_innobase::create");

	create_table_info_t	info(ha_thd(),
				     form,
				     create_info,
				     norm_name,
				     temp_path,
				     remote_path,
				     tablespace);

	/* Initialize the object. */
	if ((error = info.initialize())) {
		DBUG_RETURN(error);
	}

	/* Prepare for create and validate options. */
	if ((error = info.prepare_create_table(name))) {
		DBUG_RETURN(error);
	}

	info.allocate_trx();

	trx = info.trx();

	/* Latch the InnoDB data dictionary exclusively so that no deadlocks
	or lock waits can happen in it during a table create operation.
	Drop table etc. do this latching in row0mysql.cc.
	Avoid locking dictionary if table is intrinsic.
	Table Object for such table is cached in THD instead of storing it
	to dictionary. */
	if (!info.is_intrinsic_temp_table()) {
		row_mysql_lock_data_dictionary(trx);
	}

	if ((error = info.create_table())) {
		goto cleanup;
	}

	innobase_commit_low(trx);

	if (!info.is_intrinsic_temp_table()) {
		ut_ad(!srv_read_only_mode);
		row_mysql_unlock_data_dictionary(trx);
		/* Flush the log to reduce probability that the .frm files and
		the InnoDB data dictionary get out-of-sync if the user runs
		with innodb_flush_log_at_trx_commit = 0 */
		log_buffer_flush_to_disk();
	}

	error = info.create_table_update_dict();

	/* Tell the InnoDB server that there might be work for
	utility threads: */

	srv_active_wake_master_thread();

	trx_free_for_mysql(trx);

	DBUG_RETURN(error);

cleanup:
	trx_rollback_for_mysql(trx);

	if (!info.is_intrinsic_temp_table()) {
		row_mysql_unlock_data_dictionary(trx);
	} else {
		THD* thd = info.thd();

		dict_table_t* intrinsic_table =
			thd_to_innodb_session(thd)->lookup_table_handler(
			info.table_name());

		if (intrinsic_table != NULL) {
			thd_to_innodb_session(thd)->unregister_table_handler(
				info.table_name());

			for (;;) {
				dict_index_t*	index;
				index = UT_LIST_GET_FIRST(
					intrinsic_table->indexes);
				if (index == NULL) {
					break;
				}
				rw_lock_free(&index->lock);
				UT_LIST_REMOVE(intrinsic_table->indexes, index);
				dict_mem_index_free(index);
				index = NULL;
			}

			dict_mem_table_free(intrinsic_table);
			intrinsic_table = NULL;
		}
	}

	trx_free_for_mysql(trx);

	DBUG_RETURN(error);
}

/*****************************************************************//**
Discards or imports an InnoDB tablespace.
@return 0 == success, -1 == error */

int
ha_innobase::discard_or_import_tablespace(
/*======================================*/
	my_bool		discard)	/*!< in: TRUE if discard, else import */
{

	DBUG_ENTER("ha_innobase::discard_or_import_tablespace");

	ut_a(m_prebuilt->trx != NULL);
	ut_a(m_prebuilt->trx->magic_n == TRX_MAGIC_N);
	ut_a(m_prebuilt->trx == thd_to_trx(ha_thd()));

	if (high_level_read_only) {
		DBUG_RETURN(HA_ERR_TABLE_READONLY);
	}

	dict_table_t*	dict_table = m_prebuilt->table;

	if (dict_table_is_temporary(dict_table)) {

		ib_senderrf(
			m_prebuilt->trx->mysql_thd, IB_LOG_LEVEL_ERROR,
			ER_CANNOT_DISCARD_TEMPORARY_TABLE);

		DBUG_RETURN(HA_ERR_TABLE_NEEDS_UPGRADE);
	}

	if (dict_table->space == srv_sys_space.space_id()) {
		ib_senderrf(
			m_prebuilt->trx->mysql_thd, IB_LOG_LEVEL_ERROR,
			ER_TABLE_IN_SYSTEM_TABLESPACE,
			dict_table->name.m_name);

		DBUG_RETURN(HA_ERR_TABLE_NEEDS_UPGRADE);
	}

	if (DICT_TF_HAS_SHARED_SPACE(dict_table->flags)) {
		my_printf_error(ER_NOT_ALLOWED_COMMAND,
			"InnoDB: Cannot %s table `%s` because it is in"
			" a general tablespace. It must be file-per-table.",
			MYF(0), discard ? "discard" : "import",
			dict_table->name.m_name);

		DBUG_RETURN(HA_ERR_NOT_ALLOWED_COMMAND);
	}

	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	if (trx_in_innodb.is_aborted()) {

		DBUG_RETURN(innobase_rollback(ht, m_user_thd, false));
	}

	trx_start_if_not_started(m_prebuilt->trx, true);

	/* Obtain an exclusive lock on the table. */
	dberr_t	err = row_mysql_lock_table(
		m_prebuilt->trx, dict_table, LOCK_X,
		discard ? "setting table lock for DISCARD TABLESPACE"
			: "setting table lock for IMPORT TABLESPACE");

	if (err != DB_SUCCESS) {
		/* unable to lock the table: do nothing */
	} else if (discard) {

		/* Discarding an already discarded tablespace should be an
		idempotent operation. Also, if the .ibd file is missing the
		user may want to set the DISCARD flag in order to IMPORT
		a new tablespace. */

		if (dict_table->ibd_file_missing) {
			ib_senderrf(
				m_prebuilt->trx->mysql_thd,
				IB_LOG_LEVEL_WARN, ER_TABLESPACE_MISSING,
				dict_table->name.m_name);
		}

		err = row_discard_tablespace_for_mysql(
			dict_table->name.m_name, m_prebuilt->trx);

	} else if (!dict_table->ibd_file_missing) {
		/* Commit the transaction in order to
		release the table lock. */
		trx_commit_for_mysql(m_prebuilt->trx);

		ib::error() << "Unable to import tablespace "
			<< dict_table->name << " because it already"
			" exists.  Please DISCARD the tablespace"
			" before IMPORT.";
		ib_senderrf(
			m_prebuilt->trx->mysql_thd, IB_LOG_LEVEL_ERROR,
			ER_TABLESPACE_EXISTS, dict_table->name.m_name);

		DBUG_RETURN(HA_ERR_TABLE_EXIST);
	} else {
		err = row_import_for_mysql(dict_table, m_prebuilt);

		if (err == DB_SUCCESS) {

			info(HA_STATUS_TIME
			     | HA_STATUS_CONST
			     | HA_STATUS_VARIABLE
			     | HA_STATUS_AUTO);
		}
	}

	/* Commit the transaction in order to release the table lock. */
	trx_commit_for_mysql(m_prebuilt->trx);

	if (err == DB_SUCCESS && !discard
	    && dict_stats_is_persistent_enabled(dict_table)) {
		dberr_t		ret;

		/* Adjust the persistent statistics. */
		ret = dict_stats_update(dict_table,
					DICT_STATS_RECALC_PERSISTENT);

		if (ret != DB_SUCCESS) {
			push_warning_printf(
				ha_thd(),
				Sql_condition::SL_WARNING,
				ER_ALTER_INFO,
				"Error updating stats for table '%s'"
				" after table rebuild: %s",
				dict_table->name.m_name, ut_strerr(ret));
		}
	}

	DBUG_RETURN(convert_error_code_to_mysql(err, dict_table->flags, NULL));
}

/*****************************************************************//**
Deletes all rows of an InnoDB table.
@return error number */

int
ha_innobase::truncate()
/*===================*/
{
	DBUG_ENTER("ha_innobase::truncate");

	/* Truncate of intrinsic table is not allowed truncate for now. */
	if (dict_table_is_intrinsic(m_prebuilt->table)) {
		DBUG_RETURN(HA_ERR_WRONG_COMMAND);
	}

	if (high_level_read_only) {
		DBUG_RETURN(HA_ERR_TABLE_READONLY);
	}

	if (UNIV_UNLIKELY(m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	/* Get the transaction associated with the current thd, or create one
	if not yet created, and update m_prebuilt->trx */

	update_thd(ha_thd());

	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	if (!trx_is_started(m_prebuilt->trx)) {
		++m_prebuilt->trx->will_lock;
	}

	dberr_t	err;

	/* Truncate the table in InnoDB */
	err = row_truncate_table_for_mysql(m_prebuilt->table, m_prebuilt->trx);

	int	error;

	if (UNIV_UNLIKELY(m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	switch (err) {
	case DB_TABLESPACE_DELETED:
	case DB_TABLESPACE_NOT_FOUND:
		ib_senderrf(
			m_prebuilt->trx->mysql_thd, IB_LOG_LEVEL_ERROR,
			(err == DB_TABLESPACE_DELETED ?
			ER_TABLESPACE_DISCARDED : ER_TABLESPACE_MISSING),
			table->s->table_name.str);
		table->status = STATUS_NOT_FOUND;
		error = HA_ERR_TABLESPACE_MISSING;
		break;

	default:
		error = convert_error_code_to_mysql(
			err, m_prebuilt->table->flags,
			m_prebuilt->trx->mysql_thd);

		table->status = STATUS_NOT_FOUND;
		break;
	}

	DBUG_RETURN(error);
}

/*****************************************************************//**
Drops a table from an InnoDB database. Before calling this function,
MySQL calls innobase_commit to commit the transaction of the current user.
Then the current user cannot have locks set on the table. Drop table
operation inside InnoDB will remove all locks any user has on the table
inside InnoDB.
@return error number */

int
ha_innobase::delete_table(
/*======================*/
	const char*	name)	/*!< in: table name */
{
	dberr_t	err;
	THD*	thd = ha_thd();
	char	norm_name[FN_REFLEN];

	DBUG_ENTER("ha_innobase::delete_table");

	DBUG_EXECUTE_IF(
		"test_normalize_table_name_low",
		test_normalize_table_name_low();
	);
	DBUG_EXECUTE_IF(
		"test_ut_format_name",
		test_ut_format_name();
	);

	/* Strangely, MySQL passes the table name without the '.frm'
	extension, in contrast to ::create */
	normalize_table_name(norm_name, name);

	innodb_session_t*&	priv = thd_to_innodb_session(thd);
	dict_table_t*		handler = priv->lookup_table_handler(norm_name);

	if (handler != NULL) {
		for (dict_index_t* index = UT_LIST_GET_FIRST(handler->indexes);
		     index != NULL;
		     index = UT_LIST_GET_NEXT(indexes, index)) {
			index->last_ins_cur->release();
			index->last_sel_cur->release();
		}
	} else if (srv_read_only_mode) {
		DBUG_RETURN(HA_ERR_TABLE_READONLY);
	}

	trx_t*	parent_trx = check_trx_exists(thd);

	TrxInInnoDB	trx_in_innodb(parent_trx);

	/* Remove the to-be-dropped table from the list of modified tables
	by parent_trx. Otherwise we may end up with an orphaned pointer to
	the table object from parent_trx::mod_tables. This could happen in:
	SET AUTOCOMMIT=0;
	CREATE TABLE t (PRIMARY KEY (a)) ENGINE=INNODB SELECT 1 AS a UNION
	ALL SELECT 1 AS a; */
	trx_mod_tables_t::const_iterator	iter;

	for (iter = parent_trx->mod_tables.begin();
	     iter != parent_trx->mod_tables.end();
	     ++iter) {

		dict_table_t*	table_to_drop = *iter;

		if (strcmp(norm_name, table_to_drop->name.m_name) == 0) {
			parent_trx->mod_tables.erase(table_to_drop);
			break;
		}
	}

	trx_t*	trx = innobase_trx_allocate(thd);

	ulint	name_len = strlen(name);

	ut_a(name_len < 1000);

	/* Either the transaction is already flagged as a locking transaction
	or it hasn't been started yet. */

	ut_a(!trx_is_started(trx) || trx->will_lock > 0);

	/* We are doing a DDL operation. */
	++trx->will_lock;

	/* Drop the table in InnoDB */

	err = row_drop_table_for_mysql(
		norm_name, trx, thd_sql_command(thd) == SQLCOM_DROP_DB,
		true, handler);

	if (err == DB_TABLE_NOT_FOUND) {
		/* Test to drop all tables which matches db/tablename + '#'.
		Only partitions can have '#' as non-first character in
		the table name!

		Temporary table names always start with '#', partitions are
		the only 'tables' that can have '#' after the first character
		and table name must have length > 0. User tables cannot have
		'#' since it would be translated to @0023. Therefor this should
		only match partitions. */
		uint	len = (uint) strlen(norm_name);
		ulint	num_partitions;
		ut_a(len < FN_REFLEN);
		norm_name[len] = '#';
		norm_name[len + 1] = 0;
		err = row_drop_database_for_mysql(norm_name, trx,
			&num_partitions);
		norm_name[len] = 0;
		if (num_partitions == 0
		    && !row_is_mysql_tmp_table_name(norm_name)) {
			table_name_t tbl_name;
			tbl_name.m_name = norm_name;
			ib::error() << "Table " << tbl_name <<
				" does not exist in the InnoDB"
				" internal data dictionary though MySQL is"
				" trying to drop it. Have you copied the .frm"
				" file of the table to the MySQL database"
				" directory from another database? "
				<< TROUBLESHOOTING_MSG;
		}
		if (num_partitions == 0) {
			err = DB_TABLE_NOT_FOUND;
		}
	}

	/* TODO: remove this when the conversion tool from ha_partition to
	native innodb partitioning is completed */
	if (err == DB_TABLE_NOT_FOUND
	    && innobase_get_lower_case_table_names() == 1) {
#ifdef _WIN32
		char*	is_part = strstr(norm_name, "#p#");
#else
		char*	is_part = strstr(norm_name, "#P#");
#endif /* _WIN32 */

		if (is_part != NULL) {
			char	par_case_name[FN_REFLEN];

#ifndef _WIN32
			/* Check for the table using lower
			case name, including the partition
			separator "P" */
			strcpy(par_case_name, norm_name);
			innobase_casedn_str(par_case_name);
#else
			/* On Windows platfrom, check
			whether there exists table name in
			system table whose name is
			not being normalized to lower case */
			create_table_info_t::normalize_table_name_low(
				par_case_name, name, FALSE);
#endif /* _WIN32 */
			err = row_drop_table_for_mysql(
				par_case_name, trx,
				thd_sql_command(thd) == SQLCOM_DROP_DB,
				true, handler);
		}
	}

	if (handler == NULL) {
		ut_ad(!srv_read_only_mode);
		/* Flush the log to reduce probability that the .frm files and
		the InnoDB data dictionary get out-of-sync if the user runs
		with innodb_flush_log_at_trx_commit = 0 */

		log_buffer_flush_to_disk();
	} else if (err == DB_SUCCESS) {
		priv->unregister_table_handler(norm_name);
	}

	innobase_commit_low(trx);

	trx_free_for_mysql(trx);

	DBUG_RETURN(convert_error_code_to_mysql(err, 0, NULL));
}

/** Validate the parameters in st_alter_tablespace
before using them in InnoDB tablespace functions.
@param[in]	thd		Connection
@param[in]	alter_info	How to do the command.
@return MySQL handler error code like HA_... */
static
int
validate_create_tablespace_info(
	THD*			thd,
	st_alter_tablespace*	alter_info)
{
	ulint	space_id;

	/* The parser ensures that these fields are provided. */
	ut_a(alter_info->tablespace_name);
	ut_a(alter_info->data_file_name);

	if (high_level_read_only) {
		return(HA_ERR_INNODB_READ_ONLY);
	}

	/* From this point forward, push a warning for each problem found
	instead of returning immediately*/
	int	error = validate_tablespace_name(
			alter_info->tablespace_name, false);

	/* Make sure the tablespace is not already open. */
	space_id = fil_space_get_id_by_name(alter_info->tablespace_name);
	if (space_id != ULINT_UNDEFINED) {
		my_printf_error(ER_TABLESPACE_EXISTS,
				"InnoDB: A tablespace named `%s`"
				" already exists.", MYF(0),
				alter_info->tablespace_name);
		error = HA_ERR_TABLESPACE_EXISTS;
	}

	if (alter_info->file_block_size) {
		/* Check for a bad file block size. */
		if (!ut_is_2pow(alter_info->file_block_size)
		    || alter_info->file_block_size < UNIV_ZIP_SIZE_MIN
		    || alter_info->file_block_size > UNIV_PAGE_SIZE_MAX) {
			my_printf_error(ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB does not support"
					" FILE_BLOCK_SIZE=%llu", MYF(0),
					alter_info->file_block_size);
			error = HA_WRONG_CREATE_OPTION;

		/* Don't allow a file block size larger than UNIV_PAGE_SIZE. */
		} else if (alter_info->file_block_size > UNIV_PAGE_SIZE) {
			my_printf_error(ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: Cannot create a tablespace"
					" with FILE_BLOCK_SIZE=%llu because"
					" INNODB_PAGE_SIZE=%lu.", MYF(0),
					alter_info->file_block_size,
					UNIV_PAGE_SIZE);
			error = HA_WRONG_CREATE_OPTION;

		/* Don't allow a compressed tablespace when page size > 16k. */
		} else if (UNIV_PAGE_SIZE > UNIV_PAGE_SIZE_DEF
			   && alter_info->file_block_size != UNIV_PAGE_SIZE) {
			my_printf_error(ER_ILLEGAL_HA_CREATE_OPTION,
					"InnoDB: Cannot create a COMPRESSED"
					" tablespace when innodb_page_size >"
					" 16k.", MYF(0));
			error = HA_WRONG_CREATE_OPTION;
		}
	}

	/* Validate the ADD DATAFILE name. */
	char*	filepath = mem_strdup(alter_info->data_file_name);
	os_normalize_path(filepath);

	/* It must end with '.ibd' and contain a basename of at least
	1 character before the.ibd extension. */
	ulint dirname_len = dirname_length(filepath);
	const char* basename = filepath + dirname_len;
	ulint	basename_len = strlen(basename);
	if (basename_len < 5) {
		my_error(ER_WRONG_FILE_NAME, MYF(0),
		alter_info->data_file_name);
		ut_free(filepath);
		return(HA_WRONG_CREATE_OPTION);
	}
	if (memcmp(&basename[basename_len - 4], DOT_IBD, 5)) {
		my_error(ER_WRONG_FILE_NAME, MYF(0),
			 alter_info->data_file_name);
		my_printf_error(ER_WRONG_FILE_NAME,
				"An IBD filepath must end with `.ibd`.",
				MYF(0));
		ut_free(filepath);
		return(HA_WRONG_CREATE_OPTION);
	}

	/* Do not allow an invalid colon in the file name. */
	const char* colon = strchr(filepath, ':');
	if (colon != NULL) {
#ifdef _WIN32
		/* Do not allow names like "C:name.ibd" because it
		specifies the "C:" drive but allows a relative location.
		It should be like "c:\". If a single colon is used it must
		be the second byte the the third byte must be a separator. */
		if (colon != &filepath[1]
		    || (colon[1] != OS_PATH_SEPARATOR)
		    || NULL != strchr(&colon[1], ':')) {
#endif /* _WIN32 */
			my_error(ER_WRONG_FILE_NAME, MYF(0),
				 alter_info->data_file_name);
			my_printf_error(ER_WRONG_FILE_NAME,
					"Invalid use of ':'.", MYF(0));
			ut_free(filepath);
			return(HA_WRONG_CREATE_OPTION);
#ifdef _WIN32
		}
#endif /* _WIN32 */
	}

#ifndef _WIN32
	/* On Non-Windows platforms, '\\' is a valid file name character.
	But for InnoDB datafiles, we always assume it is a directory
	separator and convert these to '/' */
	if (strchr(alter_info->data_file_name, '\\') != NULL) {
		ib::warn() << "Converting backslash to forward slash in"
			" ADD DATAFILE " << alter_info->data_file_name;
	}
#endif /* _WIN32 */

	/* The directory path must be pre-existing. */
	Folder folder(filepath, dirname_len);
	ut_free(filepath);
	if (!folder.exists()) {
		my_error(ER_WRONG_FILE_NAME, MYF(0),
			 alter_info->data_file_name);
		my_printf_error(ER_WRONG_FILE_NAME,
				"The directory does not exist.", MYF(0));
		return(HA_WRONG_CREATE_OPTION);
	}

	/* CREATE TABLESPACE...ADD DATAFILE can be inside but not under
	the datadir.*/
	if (folder_mysql_datadir > folder) {
		my_error(ER_WRONG_FILE_NAME, MYF(0),
			 alter_info->data_file_name);
		my_printf_error(ER_WRONG_FILE_NAME,
				"CREATE TABLESPACE data file"
				" cannot be under the datadir.", MYF(0));
		error = HA_WRONG_CREATE_OPTION;
	}

	return(error);
}

/** CREATE a tablespace.
@param[in]	hton		Handlerton of InnoDB
@param[in]	thd		Connection
@param[in]	alter_info	How to do the command
@return MySQL error code*/
static
int
innobase_create_tablespace(
	handlerton*		hton,
	THD*			thd,
	st_alter_tablespace*	alter_info)
{
	trx_t*		trx;
	int		error;
	Tablespace	tablespace;

	DBUG_ENTER("innobase_create_tablespace");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	/* Be sure the input parameters are valid before continuing. */
	error = validate_create_tablespace_info(thd, alter_info);
	if (error) {
		DBUG_RETURN(error);
	}

	/* Create the tablespace object. */
	tablespace.set_name(alter_info->tablespace_name);

	dberr_t err = tablespace.add_datafile(alter_info->data_file_name);
	if (err != DB_SUCCESS) {
		DBUG_RETURN(convert_error_code_to_mysql(err, 0, NULL));
	}

	/* Get the transaction associated with the current thd and make
	sure it will not block this DDL. */
	trx_t*	parent_trx = check_trx_exists(thd);

	/* In case MySQL calls this in the middle of a SELECT
	query, release possible adaptive hash latch to avoid
	deadlocks of threads */
	trx_search_latch_release_if_reserved(parent_trx);

	/* Allocate a new transaction for this DDL */
	trx = innobase_trx_allocate(thd);
	++trx->will_lock;

	trx_start_if_not_started(trx, true);
	row_mysql_lock_data_dictionary(trx);

	/* In FSP_FLAGS, a zip_ssize of zero means that the tablespace
	holds non-compresssed tables.  A non-zero zip_ssize means that
	the general tablespace can ONLY contain compressed tables. */
	ulint	zip_size = static_cast<ulint>(alter_info->file_block_size);
	ut_ad(zip_size <= UNIV_PAGE_SIZE_MAX);
	if (zip_size == 0) {
		zip_size = UNIV_PAGE_SIZE;
	}
	bool	zipped = (zip_size != UNIV_PAGE_SIZE);
	page_size_t	page_size(zip_size, UNIV_PAGE_SIZE, zipped);
	bool atomic_blobs = page_size.is_compressed();

	/* Create the filespace flags */
	ulint	fsp_flags = fsp_flags_init(
		page_size,	/* page sizes and a flag if compressed */
		atomic_blobs,	/* needed only for compressed tables */
		false,		/* This is not a file-per-table tablespace */
		true,		/* This is a general shared tablespace */
		false);		/* Temporary General Tablespaces not allowed */
	tablespace.set_flags(fsp_flags);

	err = dict_build_tablespace(&tablespace);
	if (err != DB_SUCCESS) {
		error = convert_error_code_to_mysql(err, 0, NULL);
		trx_rollback_for_mysql(trx);
		goto cleanup;
	}

	innobase_commit_low(trx);

cleanup:
	row_mysql_unlock_data_dictionary(trx);
	trx_free_for_mysql(trx);

	DBUG_RETURN(error);
}

/** DROP a tablespace.
@param[in]	hton		Handlerton of InnoDB
@param[in]	thd		Connection
@param[in]	alter_info	How to do the command
@return MySQL error code*/
static
int
innobase_drop_tablespace(
	handlerton*		hton,
	THD*			thd,
	st_alter_tablespace*	alter_info)
{
	trx_t*		trx;
	dberr_t		err;
	int		error = 0;
	ulint		space_id;

	DBUG_ENTER("innobase_drop_tablespace");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	if (srv_read_only_mode) {
		DBUG_RETURN(HA_ERR_INNODB_READ_ONLY);
	}

	error = validate_tablespace_name(alter_info->tablespace_name, false);
	if (error != 0) {
		DBUG_RETURN(error);
	}

	/* Be sure that this tablespace is known and valid. */
	space_id = fil_space_get_id_by_name(alter_info->tablespace_name);
	if (space_id == ULINT_UNDEFINED) {
		DBUG_RETURN(HA_ERR_TABLESPACE_MISSING);
	}

	/* The tablespace can only be dropped if it is empty. */
	if (!dict_tablespace_is_empty(space_id)) {
		DBUG_RETURN(HA_ERR_TABLESPACE_IS_NOT_EMPTY);
	}

	/* Get the transaction associated with the current thd and make sure
	it will not block this DDL. */
	trx_t*	parent_trx = check_trx_exists(thd);

	/* In case MySQL calls this in the middle of a SELECT
	query, release possible adaptive hash latch to avoid
	deadlocks of threads */
	trx_search_latch_release_if_reserved(parent_trx);

	/* Allocate a new transaction for this DDL */
	trx = innobase_trx_allocate(thd);
	++trx->will_lock;

	trx_start_if_not_started(trx, true);
	row_mysql_lock_data_dictionary(trx);

	/* Update SYS_TABLESPACES and SYS_DATAFILES */
	err = dict_delete_tablespace_and_datafiles(space_id, trx);
	if (err != DB_SUCCESS) {
		ib::error() << "Unable to delete the dictionary entries"
			" for tablespace `" << alter_info->tablespace_name
			<< "`, Space ID " << space_id;
		error = convert_error_code_to_mysql(err, 0, NULL);
		trx_rollback_for_mysql(trx);
		goto cleanup;
	}

	/* Delete the physical files, fil_space_t & fil_node_t entries. */
	err = fil_delete_tablespace(space_id, BUF_REMOVE_FLUSH_NO_WRITE);
	if (err != DB_SUCCESS) {
		ib::error() << "Unable to delete the tablespace `"
			<< alter_info->tablespace_name
			<< "`, Space ID " << space_id;
		error = convert_error_code_to_mysql(err, 0, NULL);
		trx_rollback_for_mysql(trx);
		goto cleanup;
	}

	innobase_commit_low(trx);

cleanup:
	row_mysql_unlock_data_dictionary(trx);
	trx_free_for_mysql(trx);

	DBUG_RETURN(error);
}

/** This API handles CREATE, ALTER & DROP commands for InnoDB tablespaces.
@param[in]	hton		Handlerton of InnoDB
@param[in]	thd		Connection
@param[in]	alter_info	How to do the command
@return MySQL error code*/
static
int
innobase_alter_tablespace(
	handlerton*		hton,
	THD*			thd,
	st_alter_tablespace*	alter_info)
{
	int		error;		/* return zero for success */
	DBUG_ENTER("innobase_alter_tablespace");

	switch (alter_info->ts_cmd_type) {
	case CREATE_TABLESPACE:
		error = innobase_create_tablespace(hton, thd, alter_info);
		break;

	case DROP_TABLESPACE:
		error = innobase_drop_tablespace(hton, thd, alter_info);
		break;

	default:
		error = HA_ADMIN_NOT_IMPLEMENTED;
	}

	if (error) {
		/* These are the most common message params */
		const char*	object_type = "TABLESPACE";
		const char*	object = alter_info->tablespace_name;

		/* Modify those params as needed. */
		switch (alter_info->ts_cmd_type) {
		case DROP_TABLESPACE:
			ib_errf(thd, IB_LOG_LEVEL_ERROR,
				ER_DROP_FILEGROUP_FAILED,
				"%s %s", object_type, object);
			break;
		case CREATE_TABLESPACE:
			ib_errf(thd, IB_LOG_LEVEL_ERROR,
				ER_CREATE_FILEGROUP_FAILED,
				"%s %s", object_type, object);
			break;
		case CREATE_LOGFILE_GROUP:
			my_error(ER_ILLEGAL_HA_CREATE_OPTION, MYF(0),
			innobase_hton_name, "LOGFILE GROUP");
			break;
		case ALTER_TABLESPACE:
		case ALTER_ACCESS_MODE_TABLESPACE:
		case DROP_LOGFILE_GROUP:
		case ALTER_LOGFILE_GROUP:
		case CHANGE_FILE_TABLESPACE:
		case TS_CMD_NOT_DEFINED:
			break;
		}
	}

	DBUG_RETURN(error);
}

/** Remove all tables in the named database inside InnoDB.
@param[in]	hton	handlerton from InnoDB
@param[in]	path	Database path; Inside InnoDB the name of the last
directory in the path is used as the database name.
For example, in 'mysql/data/test' the database name is 'test'. */
static
void
innobase_drop_database(
	handlerton*	hton,
	char*		path)
{
	char*	namebuf;

	/* Get the transaction associated with the current thd, or create one
	if not yet created */

	DBUG_ASSERT(hton == innodb_hton_ptr);

	if (srv_read_only_mode) {
		return;
	}

	THD*	thd = current_thd;

	/* In the Windows plugin, thd = current_thd is always NULL */
	if (thd != NULL) {
		trx_t*	parent_trx = check_trx_exists(thd);

		/* In case MySQL calls this in the middle of a SELECT
		query, release possible adaptive hash latch to avoid
		deadlocks of threads */

		trx_search_latch_release_if_reserved(parent_trx);
	}

	ulint	len = 0;
	char*	ptr = strend(path) - 2;

	while (ptr >= path && *ptr != '\\' && *ptr != '/') {
		ptr--;
		len++;
	}

	ptr++;
	namebuf = (char*) my_malloc(PSI_INSTRUMENT_ME, (uint) len + 2, MYF(0));

	memcpy(namebuf, ptr, len);
	namebuf[len] = '/';
	namebuf[len + 1] = '\0';

#ifdef	_WIN32
	innobase_casedn_str(namebuf);
#endif /* _WIN32 */

	trx_t*	trx = innobase_trx_allocate(thd);

	/* Either the transaction is already flagged as a locking transaction
	or it hasn't been started yet. */

	ut_a(!trx_is_started(trx) || trx->will_lock > 0);

	/* We are doing a DDL operation. */
	++trx->will_lock;

	ulint	dummy;

	row_drop_database_for_mysql(namebuf, trx, &dummy);

	my_free(namebuf);

	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */

	log_buffer_flush_to_disk();

	innobase_commit_low(trx);

	trx_free_for_mysql(trx);
}

/*********************************************************************//**
Renames an InnoDB table.
@return DB_SUCCESS or error code */
inline __attribute__((warn_unused_result))
dberr_t
innobase_rename_table(
/*==================*/
	trx_t*		trx,	/*!< in: transaction */
	const char*	from,	/*!< in: old name of the table */
	const char*	to)	/*!< in: new name of the table */
{
	dberr_t	error;
	char	norm_to[FN_REFLEN];
	char	norm_from[FN_REFLEN];

	DBUG_ENTER("innobase_rename_table");
	DBUG_ASSERT(trx_get_dict_operation(trx) == TRX_DICT_OP_INDEX);

	ut_ad(!srv_read_only_mode);

	normalize_table_name(norm_to, to);
	normalize_table_name(norm_from, from);

	DEBUG_SYNC_C("innodb_rename_table_ready");

	TrxInInnoDB	trx_in_innodb(trx);

	trx_start_if_not_started(trx, true);

	/* Serialize data dictionary operations with dictionary mutex:
	no deadlocks can occur then in these operations. */

	row_mysql_lock_data_dictionary(trx);

	/* Transaction must be flagged as a locking transaction or it hasn't
	been started yet. */

	ut_a(trx->will_lock > 0);

	error = row_rename_table_for_mysql(norm_from, norm_to, trx, TRUE);

	if (error == DB_TABLE_NOT_FOUND) {
		/* May be partitioned table, which consists of partitions
		named table_name#P#partition_name[#SP#subpartition_name].

		We are doing a DDL operation. */
		++trx->will_lock;
		trx_set_dict_operation(trx, TRX_DICT_OP_INDEX);
		trx_start_if_not_started(trx, true);
		error = row_rename_partitions_for_mysql(norm_from, norm_to,
							trx);
		if (error == DB_TABLE_NOT_FOUND) {
			ib::error() << "Table " << ut_get_name(trx, norm_from)
				<< " does not exist in the InnoDB internal"
				" data dictionary though MySQL is trying to"
				" rename the table. Have you copied the .frm"
				" file of the table to the MySQL database"
				" directory from another database? "
				<< TROUBLESHOOTING_MSG;
		}
	}
	if (error != DB_SUCCESS) {
		if (error == DB_TABLE_NOT_FOUND
		    && innobase_get_lower_case_table_names() == 1) {
			char*	is_part = NULL;
#ifdef _WIN32
			is_part = strstr(norm_from, "#p#");
#else
			is_part = strstr(norm_from, "#P#");
#endif /* _WIN32 */

			if (is_part) {
				char	par_case_name[FN_REFLEN];
#ifndef _WIN32
				/* Check for the table using lower
				case name, including the partition
				separator "P" */
				strcpy(par_case_name, norm_from);
				innobase_casedn_str(par_case_name);
#else
				/* On Windows platfrom, check
				whether there exists table name in
				system table whose name is
				not being normalized to lower case */
				create_table_info_t::normalize_table_name_low(
					par_case_name, from, FALSE);
#endif /* _WIN32 */
				trx_start_if_not_started(trx, true);
				error = row_rename_table_for_mysql(
					par_case_name, norm_to, trx, TRUE);
			}
		}

		if (error == DB_SUCCESS) {
#ifndef _WIN32
			sql_print_warning("Rename partition table %s"
					  " succeeds after converting to lower"
					  " case. The table may have"
					  " been moved from a case"
					  " in-sensitive file system.\n",
					  norm_from);
#else
			sql_print_warning("Rename partition table %s"
					  " succeeds after skipping the step to"
					  " lower case the table name."
					  " The table may have been"
					  " moved from a case sensitive"
					  " file system.\n",
					  norm_from);
#endif /* _WIN32 */
		}
	}

	row_mysql_unlock_data_dictionary(trx);

	/* Flush the log to reduce probability that the .frm
	files and the InnoDB data dictionary get out-of-sync
	if the user runs with innodb_flush_log_at_trx_commit = 0 */

	log_buffer_flush_to_disk();

	DBUG_RETURN(error);
}

/*********************************************************************//**
Renames an InnoDB table.
@return 0 or error code */

int
ha_innobase::rename_table(
/*======================*/
	const char*	from,	/*!< in: old name of the table */
	const char*	to)	/*!< in: new name of the table */
{
	THD*	thd = ha_thd();

	DBUG_ENTER("ha_innobase::rename_table");

	if (high_level_read_only) {
		ib_senderrf(thd, IB_LOG_LEVEL_WARN, ER_READ_ONLY_MODE);
		DBUG_RETURN(HA_ERR_TABLE_READONLY);
	}

	/* Get the transaction associated with the current thd, or create one
	if not yet created */

	trx_t*	parent_trx = check_trx_exists(thd);

	TrxInInnoDB	trx_in_innodb(parent_trx);

	trx_t*	trx = innobase_trx_allocate(thd);

	/* We are doing a DDL operation. */
	++trx->will_lock;
	trx_set_dict_operation(trx, TRX_DICT_OP_INDEX);

	dberr_t	error = innobase_rename_table(trx, from, to);

	DEBUG_SYNC(thd, "after_innobase_rename_table");

	innobase_commit_low(trx);

	trx_free_for_mysql(trx);

	if (error == DB_SUCCESS) {
		char	norm_from[MAX_FULL_NAME_LEN];
		char	norm_to[MAX_FULL_NAME_LEN];
		char	errstr[512];
		dberr_t	ret;

		normalize_table_name(norm_from, from);
		normalize_table_name(norm_to, to);

		ret = dict_stats_rename_table(norm_from, norm_to,
					      errstr, sizeof(errstr));

		if (ret != DB_SUCCESS) {
			ib::error() << errstr;

			push_warning(thd, Sql_condition::SL_WARNING,
				     ER_LOCK_WAIT_TIMEOUT, errstr);
		}
	}

	/* Add a special case to handle the Duplicated Key error
	and return DB_ERROR instead.
	This is to avoid a possible SIGSEGV error from mysql error
	handling code. Currently, mysql handles the Duplicated Key
	error by re-entering the storage layer and getting dup key
	info by calling get_dup_key(). This operation requires a valid
	table handle ('row_prebuilt_t' structure) which could no
	longer be available in the error handling stage. The suggested
	solution is to report a 'table exists' error message (since
	the dup key error here is due to an existing table whose name
	is the one we are trying to rename to) and return the generic
	error code. */
	if (error == DB_DUPLICATE_KEY) {
		my_error(ER_TABLE_EXISTS_ERROR, MYF(0), to);

		error = DB_ERROR;
	}

	DBUG_RETURN(convert_error_code_to_mysql(error, 0, NULL));
}

/*********************************************************************//**
Returns the exact number of records that this client can see using this
handler object.
@return Error code in case something goes wrong.
These errors will abort the current query:
      case HA_ERR_LOCK_DEADLOCK:
      case HA_ERR_LOCK_TABLE_FULL:
      case HA_ERR_LOCK_WAIT_TIMEOUT:
      case HA_ERR_QUERY_INTERRUPTED:
For other error codes, the server will fall back to counting records. */

int
ha_innobase::records(
/*==================*/
	ha_rows*			num_rows) /*!< out: number of rows */
{
	DBUG_ENTER("ha_innobase::records()");

	dberr_t		ret;
	ulint		n_rows = 0;	/* Record count in this view */

	update_thd();

	if (dict_table_is_discarded(m_prebuilt->table)) {
		ib_senderrf(
			m_user_thd,
			IB_LOG_LEVEL_ERROR,
			ER_TABLESPACE_DISCARDED,
			table->s->table_name.str);

		*num_rows = HA_POS_ERROR;
		DBUG_RETURN(HA_ERR_NO_SUCH_TABLE);

	} else if (m_prebuilt->table->ibd_file_missing) {
		ib_senderrf(
			m_user_thd, IB_LOG_LEVEL_ERROR,
			ER_TABLESPACE_MISSING,
			table->s->table_name.str);

		*num_rows = HA_POS_ERROR;
		DBUG_RETURN(HA_ERR_TABLESPACE_MISSING);

	} else if (m_prebuilt->table->corrupted) {
		ib_errf(m_user_thd, IB_LOG_LEVEL_WARN,
			ER_INNODB_INDEX_CORRUPT,
			"Table '%s' is corrupt.",
			table->s->table_name.str);

		*num_rows = HA_POS_ERROR;
		DBUG_RETURN(HA_ERR_INDEX_CORRUPT);
	}

	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	m_prebuilt->trx->op_info = "counting records";

	dict_index_t*	index = dict_table_get_first_index(m_prebuilt->table);

	ut_ad(dict_index_is_clust(index));

	m_prebuilt->index_usable = row_merge_is_index_usable(
		m_prebuilt->trx, index);

	if (!m_prebuilt->index_usable) {
		*num_rows = HA_POS_ERROR;
		DBUG_RETURN(HA_ERR_TABLE_DEF_CHANGED);
	}

	/* (Re)Build the m_prebuilt->mysql_template if it is null to use
	the clustered index and just the key, no off-record data. */
	m_prebuilt->index = index;
	dtuple_set_n_fields(m_prebuilt->search_tuple, 0);
	m_prebuilt->read_just_key = 1;
	build_template(false);

	/* Count the records in the clustered index */
	ret = row_scan_index_for_mysql(m_prebuilt, index, false, &n_rows);
	reset_template();
	switch (ret) {
	case DB_SUCCESS:
		break;
	case DB_DEADLOCK:
	case DB_LOCK_TABLE_FULL:
	case DB_LOCK_WAIT_TIMEOUT:
		*num_rows = HA_POS_ERROR;
		DBUG_RETURN(convert_error_code_to_mysql(ret, 0, m_user_thd));
	case DB_INTERRUPTED:
		*num_rows = HA_POS_ERROR;
		DBUG_RETURN(HA_ERR_QUERY_INTERRUPTED);
	default:
		/* No other error besides the three below is returned from
		row_scan_index_for_mysql(). Make a debug catch. */
		*num_rows = HA_POS_ERROR;
		ut_ad(0);
		DBUG_RETURN(-1);
	}

	m_prebuilt->trx->op_info = "";

	if (thd_killed(m_user_thd)) {
		*num_rows = HA_POS_ERROR;
		DBUG_RETURN(HA_ERR_QUERY_INTERRUPTED);
	}

	*num_rows= n_rows;
	DBUG_RETURN(0);
}

/*********************************************************************//**
Estimates the number of index records in a range.
@return estimated number of rows */

ha_rows
ha_innobase::records_in_range(
/*==========================*/
	uint			keynr,		/*!< in: index number */
	key_range		*min_key,	/*!< in: start key value of the
						range, may also be 0 */
	key_range		*max_key)	/*!< in: range end key val, may
						also be 0 */
{
	KEY*		key;
	dict_index_t*	index;
	dtuple_t*	range_start;
	dtuple_t*	range_end;
	int64_t		n_rows;
	page_cur_mode_t	mode1;
	page_cur_mode_t	mode2;
	mem_heap_t*	heap;

	DBUG_ENTER("records_in_range");

	ut_a(m_prebuilt->trx == thd_to_trx(ha_thd()));

	m_prebuilt->trx->op_info = "estimating records in index range";

	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	active_index = keynr;

	key = table->key_info + active_index;

	index = innobase_get_index(keynr);

	/* There exists possibility of not being able to find requested
	index due to inconsistency between MySQL and InoDB dictionary info.
	Necessary message should have been printed in innobase_get_index() */
	if (dict_table_is_discarded(m_prebuilt->table)) {
		n_rows = HA_POS_ERROR;
		goto func_exit;
	}
	if (!index) {
		n_rows = HA_POS_ERROR;
		goto func_exit;
	}
	if (dict_index_is_corrupted(index)) {
		n_rows = HA_ERR_INDEX_CORRUPT;
		goto func_exit;
	}
	if (!row_merge_is_index_usable(m_prebuilt->trx, index)) {
		n_rows = HA_ERR_TABLE_DEF_CHANGED;
		goto func_exit;
	}

	heap = mem_heap_create(2 * (key->actual_key_parts * sizeof(dfield_t)
				    + sizeof(dtuple_t)));

	range_start = dtuple_create(heap, key->actual_key_parts);
	dict_index_copy_types(range_start, index, key->actual_key_parts);

	range_end = dtuple_create(heap, key->actual_key_parts);
	dict_index_copy_types(range_end, index, key->actual_key_parts);

	row_sel_convert_mysql_key_to_innobase(
		range_start,
		m_prebuilt->srch_key_val1,
		m_prebuilt->srch_key_val_len,
		index,
		(byte*) (min_key ? min_key->key : (const uchar*) 0),
		(ulint) (min_key ? min_key->length : 0),
		m_prebuilt->trx);

	DBUG_ASSERT(min_key
		    ? range_start->n_fields > 0
		    : range_start->n_fields == 0);

	row_sel_convert_mysql_key_to_innobase(
		range_end,
		m_prebuilt->srch_key_val2,
		m_prebuilt->srch_key_val_len,
		index,
		(byte*) (max_key ? max_key->key : (const uchar*) 0),
		(ulint) (max_key ? max_key->length : 0),
		m_prebuilt->trx);

	DBUG_ASSERT(max_key
		    ? range_end->n_fields > 0
		    : range_end->n_fields == 0);

	mode1 = convert_search_mode_to_innobase(
		min_key ? min_key->flag : HA_READ_KEY_EXACT);

	mode2 = convert_search_mode_to_innobase(
		max_key ? max_key->flag : HA_READ_KEY_EXACT);

	if (mode1 != PAGE_CUR_UNSUPP && mode2 != PAGE_CUR_UNSUPP) {

		if (dict_index_is_spatial(index)) {
			/*Only min_key used in spatial index. */
			n_rows = rtr_estimate_n_rows_in_range(
				index, range_start, mode1);
		} else {
			n_rows = btr_estimate_n_rows_in_range(
				index, range_start, mode1, range_end, mode2);
		}
	} else {

		n_rows = HA_POS_ERROR;
	}

	mem_heap_free(heap);

	DBUG_EXECUTE_IF(
		"print_btr_estimate_n_rows_in_range_return_value",
		push_warning_printf(
			ha_thd(), Sql_condition::SL_WARNING,
			ER_NO_DEFAULT,
			"btr_estimate_n_rows_in_range(): %" PRId64, n_rows);
	);

func_exit:

	m_prebuilt->trx->op_info = (char*)"";

	/* The MySQL optimizer seems to believe an estimate of 0 rows is
	always accurate and may return the result 'Empty set' based on that.
	The accuracy is not guaranteed, and even if it were, for a locking
	read we should anyway perform the search to set the next-key lock.
	Add 1 to the value to make sure MySQL does not make the assumption! */

	if (n_rows == 0) {
		n_rows = 1;
	}

	DBUG_RETURN((ha_rows) n_rows);
}

/*********************************************************************//**
Gives an UPPER BOUND to the number of rows in a table. This is used in
filesort.cc.
@return upper bound of rows */

ha_rows
ha_innobase::estimate_rows_upper_bound()
/*====================================*/
{
	const dict_index_t*	index;
	ulonglong		estimate;
	ulonglong		local_data_file_length;

	DBUG_ENTER("estimate_rows_upper_bound");

	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(ha_thd());

	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	m_prebuilt->trx->op_info = "calculating upper bound for table rows";

	index = dict_table_get_first_index(m_prebuilt->table);

	ulint	stat_n_leaf_pages = index->stat_n_leaf_pages;

	ut_a(stat_n_leaf_pages > 0);

	local_data_file_length =
		((ulonglong) stat_n_leaf_pages) * UNIV_PAGE_SIZE;

	/* Calculate a minimum length for a clustered index record and from
	that an upper bound for the number of rows. Since we only calculate
	new statistics in row0mysql.cc when a table has grown by a threshold
	factor, we must add a safety factor 2 in front of the formula below. */

	estimate = 2 * local_data_file_length
		/ dict_index_calc_min_rec_len(index);

	m_prebuilt->trx->op_info = "";

        /* Set num_rows less than MERGEBUFF to simulate the case where we do
        not have enough space to merge the externally sorted file blocks. */
        DBUG_EXECUTE_IF("set_num_rows_lt_MERGEBUFF",
                        estimate = 2;
                        DBUG_SET("-d,set_num_rows_lt_MERGEBUFF");
                       );

	DBUG_RETURN((ha_rows) estimate);
}

/*********************************************************************//**
How many seeks it will take to read through the table. This is to be
comparable to the number returned by records_in_range so that we can
decide if we should scan the table or use keys.
@return estimated time measured in disk seeks */

double
ha_innobase::scan_time()
/*====================*/
{
	/* Since MySQL seems to favor table scans too much over index
	searches, we pretend that a sequential read takes the same time
	as a random disk read, that is, we do not divide the following
	by 10, which would be physically realistic. */

	/* The locking below is disabled for performance reasons. Without
	it we could end up returning uninitialized value to the caller,
	which in the worst case could make some query plan go bogus or
	issue a Valgrind warning. */

	if (m_prebuilt == NULL) {
		/* In case of derived table, Optimizer will try to fetch stat
		for table even before table is create or open. In such
		cases return default value of 1.
		TODO: This will be further improved to return some approximate
		estimate but that would also needs pre-population of stats
		structure. As of now approach is in sync with MyISAM. */
		return(ulonglong2double(stats.data_file_length) / IO_SIZE + 2);
	}

	ulint	stat_clustered_index_size;

	ut_a(m_prebuilt->table->stat_initialized);

	stat_clustered_index_size =
		m_prebuilt->table->stat_clustered_index_size;

	return((double) stat_clustered_index_size);
}

/******************************************************************//**
Calculate the time it takes to read a set of ranges through an index
This enables us to optimise reads for clustered indexes.
@return estimated time measured in disk seeks */

double
ha_innobase::read_time(
/*===================*/
	uint	index,	/*!< in: key number */
	uint	ranges,	/*!< in: how many ranges */
	ha_rows rows)	/*!< in: estimated number of rows in the ranges */
{
	ha_rows total_rows;

	if (index != table->s->primary_key) {
		/* Not clustered */
		return(handler::read_time(index, ranges, rows));
	}

	if (rows <= 2) {

		return((double) rows);
	}

	/* Assume that the read time is proportional to the scan time for all
	rows + at most one seek per range. */

	double	time_for_scan = scan_time();

	if ((total_rows = estimate_rows_upper_bound()) < rows) {

		return(time_for_scan);
	}

	return(ranges + (double) rows / (double) total_rows * time_for_scan);
}

/******************************************************************//**
Return the size of the InnoDB memory buffer. */

longlong
ha_innobase::get_memory_buffer_size() const
/*=======================================*/
{
	return(innobase_buffer_pool_size);
}

/** Update the system variable with the given value of the InnoDB
buffer pool size.
@param[in]	buf_pool_size	given value of buffer pool size.*/
void
innodb_set_buf_pool_size(ulonglong buf_pool_size)
{
	innobase_buffer_pool_size = buf_pool_size;
}

/*********************************************************************//**
Calculates the key number used inside MySQL for an Innobase index. We will
first check the "index translation table" for a match of the index to get
the index number. If there does not exist an "index translation table",
or not able to find the index in the translation table, then we will fall back
to the traditional way of looping through dict_index_t list to find a
match. In this case, we have to take into account if we generated a
default clustered index for the table
@return the key number used inside MySQL */
static
int
innobase_get_mysql_key_number_for_index(
/*====================================*/
	INNOBASE_SHARE*		share,	/*!< in: share structure for index
					translation table. */
	const TABLE*		table,	/*!< in: table in MySQL data
					dictionary */
	dict_table_t*		ib_table,/*!< in: table in InnoDB data
					dictionary */
	const dict_index_t*	index)	/*!< in: index */
{
	const dict_index_t*	ind;
	unsigned int		i;

	/* If index does not belong to the table object of share structure
	(ib_table comes from the share structure) search the index->table
	object instead */
	if (index->table != ib_table) {
		i = 0;
		ind = dict_table_get_first_index(index->table);

		while (index != ind) {
			ind = dict_table_get_next_index(ind);
			i++;
		}

		if (row_table_got_default_clust_index(index->table)) {
			ut_a(i > 0);
			i--;
		}

		return(i);
	}

	/* If index translation table exists, we will first check
	the index through index translation table for a match. */
	if (share->idx_trans_tbl.index_mapping != NULL) {
		for (i = 0; i < share->idx_trans_tbl.index_count; i++) {
			if (share->idx_trans_tbl.index_mapping[i] == index) {
				return(i);
			}
		}

		/* Print an error message if we cannot find the index
		in the "index translation table". */
		if (index->is_committed()) {
			sql_print_error("Cannot find index %s in InnoDB index"
					" translation table.", index->name());
		}
	}

	/* If we do not have an "index translation table", or not able
	to find the index in the translation table, we'll directly find
	matching index with information from mysql TABLE structure and
	InnoDB dict_index_t list */
	for (i = 0; i < table->s->keys; i++) {
		ind = dict_table_get_index_on_name(
			ib_table, table->key_info[i].name);

		if (index == ind) {
			return(i);
		}
	}

	/* Loop through each index of the table and lock them */
	for (ind = dict_table_get_first_index(ib_table);
	     ind != NULL;
	     ind = dict_table_get_next_index(ind)) {
		if (index == ind) {
			/* Temp index is internal to InnoDB, that is
			not present in the MySQL index list, so no
			need to print such mismatch warning. */
			if (index->is_committed()) {
				sql_print_warning(
					"Found index %s in InnoDB index list"
					" but not its MySQL index number."
					" It could be an InnoDB internal"
					" index.",
					index->name());
			}
			return(-1);
		}
	}

	ut_error;

	return(-1);
}

/*********************************************************************//**
Calculate Record Per Key value. Need to exclude the NULL value if
innodb_stats_method is set to "nulls_ignored"
@return estimated record per key value */
rec_per_key_t
innodb_rec_per_key(
/*===============*/
	dict_index_t*	index,		/*!< in: dict_index_t structure */
	ulint		i,		/*!< in: the column we are
					calculating rec per key */
	ha_rows		records)	/*!< in: estimated total records */
{
	rec_per_key_t	rec_per_key;
	ib_uint64_t	n_diff;

	ut_a(index->table->stat_initialized);

	ut_ad(i < dict_index_get_n_unique(index));
	ut_ad(!dict_index_is_spatial(index));

	if (records == 0) {
		/* "Records per key" is meaningless for empty tables.
		Return 1.0 because that is most convenient to the Optimizer. */
		return(1.0);
	}

	n_diff = index->stat_n_diff_key_vals[i];

	if (n_diff == 0) {

		rec_per_key = static_cast<rec_per_key_t>(records);
	} else if (srv_innodb_stats_method == SRV_STATS_NULLS_IGNORED) {
		ib_uint64_t	n_null;
		ib_uint64_t	n_non_null;

		n_non_null = index->stat_n_non_null_key_vals[i];

		/* In theory, index->stat_n_non_null_key_vals[i]
		should always be less than the number of records.
		Since this is statistics value, the value could
		have slight discrepancy. But we will make sure
		the number of null values is not a negative number. */
		if (records < n_non_null) {
			n_null = 0;
		} else {
			n_null = records - n_non_null;
		}

		/* If the number of NULL values is the same as or
		large than that of the distinct values, we could
		consider that the table consists mostly of NULL value.
		Set rec_per_key to 1. */
		if (n_diff <= n_null) {
			rec_per_key = 1.0;
		} else {
			/* Need to exclude rows with NULL values from
			rec_per_key calculation */
			rec_per_key
				= static_cast<rec_per_key_t>(records - n_null)
				/ (n_diff - n_null);
		}
	} else {
		DEBUG_SYNC_C("after_checking_for_0");
		rec_per_key = static_cast<rec_per_key_t>(records) / n_diff;
	}

	if (rec_per_key < 1.0) {
		/* Values below 1.0 are meaningless and must be due to the
		stats being imprecise. */
		rec_per_key = 1.0;
	}

	return(rec_per_key);
}

/*********************************************************************//**
Returns statistics information of the table to the MySQL interpreter,
in various fields of the handle object.
@return HA_ERR_* error code or 0 */

int
ha_innobase::info_low(
/*==================*/
	uint	flag,	/*!< in: what information is requested */
	bool	is_analyze)
{
	dict_table_t*	ib_table;
	ib_uint64_t	n_rows;
	char		path[FN_REFLEN];
	os_file_stat_t	stat_info;

	DBUG_ENTER("info");

	DEBUG_SYNC_C("ha_innobase_info_low");

	/* If we are forcing recovery at a high level, we will suppress
	statistics calculation on tables, because that may crash the
	server if an index is badly corrupted. */

	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(ha_thd());

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	m_prebuilt->trx->op_info = (char*)"returning various info to MySQL";

	trx_search_latch_release_if_reserved(m_prebuilt->trx);

	ib_table = m_prebuilt->table;
	DBUG_ASSERT(ib_table->n_ref_count > 0);

	if (flag & HA_STATUS_TIME) {
		if (is_analyze || innobase_stats_on_metadata) {

			dict_stats_upd_option_t	opt;
			dberr_t			ret;

			m_prebuilt->trx->op_info = "updating table statistics";

			if (dict_stats_is_persistent_enabled(ib_table)) {

				if (is_analyze) {
					opt = DICT_STATS_RECALC_PERSISTENT;
				} else {
					/* This is e.g. 'SHOW INDEXES', fetch
					the persistent stats from disk. */
					opt = DICT_STATS_FETCH_ONLY_IF_NOT_IN_MEMORY;
				}
			} else {
				opt = DICT_STATS_RECALC_TRANSIENT;
			}

			ut_ad(!mutex_own(&dict_sys->mutex));
			ret = dict_stats_update(ib_table, opt);

			if (ret != DB_SUCCESS) {
				m_prebuilt->trx->op_info = "";
				DBUG_RETURN(HA_ERR_GENERIC);
			}

			m_prebuilt->trx->op_info =
				"returning various info to MySQL";
		}


		stats.update_time = (ulong) ib_table->update_time;
	}

	if (flag & HA_STATUS_VARIABLE) {

		ulint	stat_clustered_index_size;
		ulint	stat_sum_of_other_index_sizes;

		if (!(flag & HA_STATUS_NO_LOCK)) {
			dict_table_stats_lock(ib_table, RW_S_LATCH);
		}

		ut_a(ib_table->stat_initialized);

		n_rows = ib_table->stat_n_rows;

		stat_clustered_index_size
			= ib_table->stat_clustered_index_size;

		stat_sum_of_other_index_sizes
			= ib_table->stat_sum_of_other_index_sizes;

		if (!(flag & HA_STATUS_NO_LOCK)) {
			dict_table_stats_unlock(ib_table, RW_S_LATCH);
		}

		/*
		The MySQL optimizer seems to assume in a left join that n_rows
		is an accurate estimate if it is zero. Of course, it is not,
		since we do not have any locks on the rows yet at this phase.
		Since SHOW TABLE STATUS seems to call this function with the
		HA_STATUS_TIME flag set, while the left join optimizer does not
		set that flag, we add one to a zero value if the flag is not
		set. That way SHOW TABLE STATUS will show the best estimate,
		while the optimizer never sees the table empty. */

		if (n_rows == 0 && !(flag & HA_STATUS_TIME)) {
			n_rows++;
		}

		/* Fix bug#40386: Not flushing query cache after truncate.
		n_rows can not be 0 unless the table is empty, set to 1
		instead. The original problem of bug#29507 is actually
		fixed in the server code. */
		if (thd_sql_command(m_user_thd) == SQLCOM_TRUNCATE) {

			n_rows = 1;

			/* We need to reset the m_prebuilt value too, otherwise
			checks for values greater than the last value written
			to the table will fail and the autoinc counter will
			not be updated. This will force write_row() into
			attempting an update of the table's AUTOINC counter. */

			m_prebuilt->autoinc_last_value = 0;
		}

		const page_size_t&	page_size
			= dict_table_page_size(ib_table);

		stats.records = (ha_rows) n_rows;
		stats.deleted = 0;
		stats.data_file_length
			= ((ulonglong) stat_clustered_index_size)
			* page_size.physical();
		stats.index_file_length
			= ((ulonglong) stat_sum_of_other_index_sizes)
			* page_size.physical();

		/* Since fsp_get_available_space_in_free_extents() is
		acquiring latches inside InnoDB, we do not call it if we
		are asked by MySQL to avoid locking. Another reason to
		avoid the call is that it uses quite a lot of CPU.
		See Bug#38185. */
		if (flag & HA_STATUS_NO_LOCK
		    || !(flag & HA_STATUS_VARIABLE_EXTRA)) {
			/* We do not update delete_length if no
			locking is requested so the "old" value can
			remain. delete_length is initialized to 0 in
			the ha_statistics' constructor. Also we only
			need delete_length to be set when
			HA_STATUS_VARIABLE_EXTRA is set */
		} else if (srv_force_recovery >= SRV_FORCE_NO_IBUF_MERGE) {
			/* Avoid accessing the tablespace if
			innodb_crash_recovery is set to a high value. */
			stats.delete_length = 0;
		} else {
			uintmax_t   avail_space;

			avail_space = fsp_get_available_space_in_free_extents(
				ib_table->space);

			if (avail_space == UINTMAX_MAX) {
				THD*	thd;
				char	errbuf[MYSYS_STRERROR_SIZE];

				thd = ha_thd();

				push_warning_printf(
					thd,
					Sql_condition::SL_WARNING,
					ER_CANT_GET_STAT,
					"InnoDB: Trying to get the free"
					" space for table %s but its"
					" tablespace has been discarded or"
					" the .ibd file is missing. Setting"
					" the free space to zero."
					" (errno: %d - %s)",
					ib_table->name.m_name, errno,
					my_strerror(errbuf, sizeof(errbuf),
						    errno));

				stats.delete_length = 0;
			} else {
				stats.delete_length = avail_space * 1024;
			}
		}

		stats.check_time = 0;
		stats.mrr_length_per_rec = ref_length + sizeof(void*);

		if (stats.records == 0) {
			stats.mean_rec_length = 0;
		} else {
			stats.mean_rec_length = (ulong)
				(stats.data_file_length / stats.records);
		}
	}

	if (flag & HA_STATUS_CONST) {
		ulong	i;
		/* Verify the number of index in InnoDB and MySQL
		matches up. If m_prebuilt->clust_index_was_generated
		holds, InnoDB defines GEN_CLUST_INDEX internally */
		ulint	num_innodb_index = UT_LIST_GET_LEN(ib_table->indexes)
			- m_prebuilt->clust_index_was_generated;
		if (table->s->keys < num_innodb_index) {
			/* If there are too many indexes defined
			inside InnoDB, ignore those that are being
			created, because MySQL will only consider
			the fully built indexes here. */

			for (const dict_index_t* index
				     = UT_LIST_GET_FIRST(ib_table->indexes);
			     index != NULL;
			     index = UT_LIST_GET_NEXT(indexes, index)) {

				/* First, online index creation is
				completed inside InnoDB, and then
				MySQL attempts to upgrade the
				meta-data lock so that it can rebuild
				the .frm file. If we get here in that
				time frame, dict_index_is_online_ddl()
				would not hold and the index would
				still not be included in TABLE_SHARE. */
				if (!index->is_committed()) {
					num_innodb_index--;
				}
			}

			if (table->s->keys < num_innodb_index
			    && innobase_fts_check_doc_id_index(
				    ib_table, NULL, NULL)
			    == FTS_EXIST_DOC_ID_INDEX) {
				num_innodb_index--;
			}
		}

		if (table->s->keys != num_innodb_index) {
			sql_print_error("InnoDB: Table %s contains %lu"
					" indexes inside InnoDB, which"
					" is different from the number of"
					" indexes %u defined in MySQL",
					ib_table->name.m_name,
					num_innodb_index, table->s->keys);
		}

		if (!(flag & HA_STATUS_NO_LOCK)) {
			dict_table_stats_lock(ib_table, RW_S_LATCH);
		}

		ut_a(ib_table->stat_initialized);

		for (i = 0; i < table->s->keys; i++) {
			ulong	j;
			/* We could get index quickly through internal
			index mapping with the index translation table.
			The identity of index (match up index name with
			that of table->key_info[i]) is already verified in
			innobase_get_index().  */
			dict_index_t* index = innobase_get_index(i);

			if (index == NULL) {
				sql_print_error("Table %s contains fewer"
						" indexes inside InnoDB than"
						" are defined in the MySQL"
						" .frm file. Have you mixed up"
						" .frm files from different"
						" installations? %s\n",
						ib_table->name.m_name,
						TROUBLESHOOTING_MSG);

				break;
			}

			KEY*	key = &table->key_info[i];

			/* Check if this index supports index statistics. */
			if (!key->supports_records_per_key()) {
				continue;
			}

			for (j = 0; j < key->actual_key_parts; j++) {

				if ((key->flags & HA_FULLTEXT)
				    || (key->flags & HA_SPATIAL)) {
					/* The record per key does not apply to
					FTS or Spatial indexes. */
					key->rec_per_key[j] = 1;
					key->set_records_per_key(j, 1.0);
					continue;
				}

				if (j + 1 > index->n_uniq) {
					sql_print_error(
						"Index %s of %s has %lu columns"
						" unique inside InnoDB, but"
						" MySQL is asking statistics for"
						" %lu columns. Have you mixed"
						" up .frm files from different"
						" installations? %s",
						index->name(),
						ib_table->name.m_name,
						(unsigned long)
						index->n_uniq, j + 1,
						TROUBLESHOOTING_MSG);
					break;
				}

				/* innodb_rec_per_key() will use
				index->stat_n_diff_key_vals[] and the value we
				pass index->table->stat_n_rows. Both are
				calculated by ANALYZE and by the background
				stats gathering thread (which kicks in when too
				much of the table has been changed). In
				addition table->stat_n_rows is adjusted with
				each DML (e.g. ++ on row insert). Those
				adjustments are not MVCC'ed and not even
				reversed on rollback. So,
				index->stat_n_diff_key_vals[] and
				index->table->stat_n_rows could have been
				calculated at different time. This is
				acceptable. */
				const rec_per_key_t	rec_per_key
					= innodb_rec_per_key(
						index, j,
						index->table->stat_n_rows);

				key->set_records_per_key(j, rec_per_key);

				/* The code below is legacy and should be
				removed together with this comment once we
				are sure the new floating point rec_per_key,
				set via set_records_per_key(), works fine. */

				ulong	rec_per_key_int = static_cast<ulong>(
					innodb_rec_per_key(index, j,
							   stats.records));

				/* Since MySQL seems to favor table scans
				too much over index searches, we pretend
				index selectivity is 2 times better than
				our estimate: */

				rec_per_key_int = rec_per_key_int / 2;

				if (rec_per_key_int == 0) {
					rec_per_key_int = 1;
				}

				key->rec_per_key[j] = rec_per_key_int;
			}
		}

		if (!(flag & HA_STATUS_NO_LOCK)) {
			dict_table_stats_unlock(ib_table, RW_S_LATCH);
		}

		my_snprintf(path, sizeof(path), "%s/%s%s",
			    mysql_data_home, table->s->normalized_path.str,
			    reg_ext);

		unpack_filename(path,path);

		/* Note that we do not know the access time of the table,
		nor the CHECK TABLE time, nor the UPDATE or INSERT time. */

		if (os_file_get_status(
			path, &stat_info, false,
			(dict_table_is_intrinsic(ib_table)
			? false : srv_read_only_mode)) == DB_SUCCESS) {
			stats.create_time = (ulong) stat_info.ctime;
		}
	}

	if (srv_force_recovery >= SRV_FORCE_NO_IBUF_MERGE) {

		goto func_exit;

	} else if (flag & HA_STATUS_ERRKEY) {
		const dict_index_t*	err_index;

		ut_a(m_prebuilt->trx);
		ut_a(m_prebuilt->trx->magic_n == TRX_MAGIC_N);

		err_index = trx_get_error_info(m_prebuilt->trx);

		if (err_index) {
			errkey = innobase_get_mysql_key_number_for_index(
					m_share, table, ib_table, err_index);
		} else {
			errkey = (unsigned int) (
				(m_prebuilt->trx->error_key_num
				 == ULINT_UNDEFINED)
					? ~0
					: m_prebuilt->trx->error_key_num);
		}
	}

	if ((flag & HA_STATUS_AUTO) && table->found_next_number_field) {

		ulonglong auto_inc_val = innobase_peek_autoinc();
		/* Initialize autoinc value if not set. */
		if (auto_inc_val == 0) {

			dict_table_autoinc_lock(m_prebuilt->table);
			innobase_initialize_autoinc();
			dict_table_autoinc_unlock(m_prebuilt->table);

			auto_inc_val = innobase_peek_autoinc();
		}
		stats.auto_increment_value = auto_inc_val;
	}

func_exit:
	m_prebuilt->trx->op_info = (char*)"";

	DBUG_RETURN(0);
}

/*********************************************************************//**
Returns statistics information of the table to the MySQL interpreter,
in various fields of the handle object.
@return HA_ERR_* error code or 0 */

int
ha_innobase::info(
/*==============*/
	uint	flag)	/*!< in: what information is requested */
{
	return(info_low(flag, false /* not ANALYZE */));
}

/** Enable indexes.
@param[in]	mode	enable index mode.
@return HA_ERR_* error code or 0 */
int
ha_innobase::enable_indexes(
	uint	mode)
{
	int	error = HA_ERR_WRONG_COMMAND;

	/* Enable index only for intrinsic table. Behavior for all other
	table continue to remain same. */

	if (dict_table_is_intrinsic(m_prebuilt->table)) {
		ut_ad(mode == HA_KEY_SWITCH_ALL);
		for (dict_index_t* index
			= UT_LIST_GET_FIRST(m_prebuilt->table->indexes);
		     index != NULL;
		     index = UT_LIST_GET_NEXT(indexes, index)) {

			/* InnoDB being clustered index we can't disable/enable
			clustered index itself. */
			if (dict_index_is_clust(index)) {
				continue;
			}

			index->allow_duplicates = false;
		}
		error = 0;
	}

	return(error);
}

/** Disable indexes.
@param[in]	mode	disable index mode.
@return HA_ERR_* error code or 0 */
int
ha_innobase::disable_indexes(
	uint	mode)
{
	int	error = HA_ERR_WRONG_COMMAND;

	/* Disable index only for intrinsic table. Behavior for all other
	table continue to remain same. */

	if (dict_table_is_intrinsic(m_prebuilt->table)) {
		ut_ad(mode == HA_KEY_SWITCH_ALL);
		for (dict_index_t* index
			= UT_LIST_GET_FIRST(m_prebuilt->table->indexes);
		     index != NULL;
		     index = UT_LIST_GET_NEXT(indexes, index)) {

			/* InnoDB being clustered index we can't disable/enable
			clustered index itself. */
			if (dict_index_is_clust(index)) {
				continue;
			}

			index->allow_duplicates = true;
		}
		error = 0;
	}

	return(error);
}

/*
Updates index cardinalities of the table, based on random dives into
each index tree. This does NOT calculate exact statistics on the table.
@return HA_ADMIN_* error code or HA_ADMIN_OK */

int
ha_innobase::analyze(
/*=================*/
	THD*		thd,		/*!< in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/*!< in: currently ignored */
{
	if (UNIV_UNLIKELY(m_share && m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		return(HA_ADMIN_CORRUPT);
	}

	/* Simply call info_low() with all the flags
	and request recalculation of the statistics */
	int	ret = info_low(
		HA_STATUS_TIME | HA_STATUS_CONST | HA_STATUS_VARIABLE,
		true /* this is ANALYZE */);

	if (UNIV_UNLIKELY(m_share && m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		return(HA_ADMIN_CORRUPT);
	}

	if (ret != 0) {
		return(HA_ADMIN_FAILED);
	}

	return(HA_ADMIN_OK);
}

/**********************************************************************//**
This is mapped to "ALTER TABLE tablename ENGINE=InnoDB", which rebuilds
the table in MySQL. */

int
ha_innobase::optimize(
/*==================*/
	THD*		thd,		/*!< in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/*!< in: currently ignored */
{

	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	/* FTS-FIXME: Since MySQL doesn't support engine-specific commands,
	we have to hijack some existing command in order to be able to test
	the new admin commands added in InnoDB's FTS support. For now, we
	use MySQL's OPTIMIZE command, normally mapped to ALTER TABLE in
	InnoDB (so it recreates the table anew), and map it to OPTIMIZE.

	This works OK otherwise, but MySQL locks the entire table during
	calls to OPTIMIZE, which is undesirable. */

	if (innodb_optimize_fulltext_only) {
		if (m_prebuilt->table->fts && m_prebuilt->table->fts->cache
		    && !dict_table_is_discarded(m_prebuilt->table)) {
			fts_sync_table(m_prebuilt->table);
			fts_optimize_table(m_prebuilt->table);
		}
		return(HA_ADMIN_OK);
	} else {

		return(HA_ADMIN_TRY_ALTER);
	}
}

/*******************************************************************//**
Tries to check that an InnoDB table is not corrupted. If corruption is
noticed, prints to stderr information about it. In case of corruption
may also assert a failure and crash the server.
@return HA_ADMIN_CORRUPT or HA_ADMIN_OK */

int
ha_innobase::check(
/*===============*/
	THD*		thd,		/*!< in: user thread handle */
	HA_CHECK_OPT*	check_opt)	/*!< in: check options */
{
	dict_index_t*	index;
	ulint		n_rows;
	ulint		n_rows_in_table	= ULINT_UNDEFINED;
	bool		is_ok		= true;
	ulint		old_isolation_level;
	dberr_t		ret;

	DBUG_ENTER("ha_innobase::check");
	DBUG_ASSERT(thd == ha_thd());
	ut_a(m_prebuilt->trx->magic_n == TRX_MAGIC_N);
	ut_a(m_prebuilt->trx == thd_to_trx(thd));

	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	if (m_prebuilt->mysql_template == NULL) {
		/* Build the template; we will use a dummy template
		in index scans done in checking */

		build_template(true);
	}

	if (dict_table_is_discarded(m_prebuilt->table)) {

		ib_senderrf(
			thd,
			IB_LOG_LEVEL_ERROR,
			ER_TABLESPACE_DISCARDED,
			table->s->table_name.str);

		DBUG_RETURN(HA_ADMIN_CORRUPT);

	} else if (m_prebuilt->table->ibd_file_missing) {

		ib_senderrf(
			thd, IB_LOG_LEVEL_ERROR,
			ER_TABLESPACE_MISSING,
			table->s->table_name.str);

		DBUG_RETURN(HA_ADMIN_CORRUPT);
	}

	m_prebuilt->trx->op_info = "checking table";

	if (m_prebuilt->table->corrupted) {
		/* If some previous oeration has marked the table as
		corrupted in memory, and has not propagated such to
		clustered index, we will do so here */
		index = dict_table_get_first_index(m_prebuilt->table);

		if (!dict_index_is_corrupted(index)) {
			dict_set_corrupted(
				index, m_prebuilt->trx, "CHECK TABLE");
		}

		push_warning_printf(m_user_thd,
				    Sql_condition::SL_WARNING,
				    HA_ERR_INDEX_CORRUPT,
				    "InnoDB: Index %s is marked as"
				    " corrupted",
				    index->name());

		/* Now that the table is already marked as corrupted,
		there is no need to check any index of this table */
		m_prebuilt->trx->op_info = "";
		if (thd_killed(m_user_thd)) {
			thd_set_kill_status(m_user_thd);
		}

		DBUG_RETURN(HA_ADMIN_CORRUPT);
	}

	old_isolation_level = m_prebuilt->trx->isolation_level;

	/* We must run the index record counts at an isolation level
	>= READ COMMITTED, because a dirty read can see a wrong number
	of records in some index; to play safe, we use always
	REPEATABLE READ here */
	m_prebuilt->trx->isolation_level = TRX_ISO_REPEATABLE_READ;

	ut_ad(!m_prebuilt->table->corrupted);

	for (index = dict_table_get_first_index(m_prebuilt->table);
	     index != NULL;
	     index = dict_table_get_next_index(index)) {
		/* If this is an index being created or dropped, skip */
		if (!index->is_committed()) {
			continue;
		}

		if (!(check_opt->flags & T_QUICK)
		    && !dict_index_is_corrupted(index)) {
			/* Enlarge the fatal lock wait timeout during
			CHECK TABLE. */
			os_atomic_increment_ulint(
				&srv_fatal_semaphore_wait_threshold,
				SRV_SEMAPHORE_WAIT_EXTENSION);

			bool valid = btr_validate_index(
					index, m_prebuilt->trx, false);

			/* Restore the fatal lock wait timeout after
			CHECK TABLE. */
			os_atomic_decrement_ulint(
				&srv_fatal_semaphore_wait_threshold,
				SRV_SEMAPHORE_WAIT_EXTENSION);

			if (!valid) {
				is_ok = false;

				push_warning_printf(
					thd,
					Sql_condition::SL_WARNING,
					ER_NOT_KEYFILE,
					"InnoDB: The B-tree of"
					" index %s is corrupted.",
					index->name());
				continue;
			}
		}

		/* Instead of invoking change_active_index(), set up
		a dummy template for non-locking reads, disabling
		access to the clustered index. */
		m_prebuilt->index = index;

		m_prebuilt->index_usable = row_merge_is_index_usable(
			m_prebuilt->trx, m_prebuilt->index);

		if (!m_prebuilt->index_usable) {
			if (dict_index_is_corrupted(m_prebuilt->index)) {
				push_warning_printf(
					m_user_thd,
					Sql_condition::SL_WARNING,
					HA_ERR_INDEX_CORRUPT,
					"InnoDB: Index %s is marked as"
					" corrupted",
					index->name());
				is_ok = false;
			} else {
				push_warning_printf(
					thd,
					Sql_condition::SL_WARNING,
					HA_ERR_TABLE_DEF_CHANGED,
					"InnoDB: Insufficient history for"
					" index %s",
					index->name());
			}
			continue;
		}

		m_prebuilt->sql_stat_start = TRUE;
		m_prebuilt->template_type = ROW_MYSQL_DUMMY_TEMPLATE;
		m_prebuilt->n_template = 0;
		m_prebuilt->need_to_access_clustered = FALSE;

		dtuple_set_n_fields(m_prebuilt->search_tuple, 0);

		m_prebuilt->select_lock_type = LOCK_NONE;

		/* Scan this index. */
		if (dict_index_is_spatial(index)) {
			ret = row_count_rtree_recs(m_prebuilt, &n_rows);
		} else {
			ret = row_scan_index_for_mysql(
				m_prebuilt, index, true, &n_rows);
		}

		DBUG_EXECUTE_IF(
			"dict_set_index_corrupted",
			if (!dict_index_is_clust(index)) {
				ret = DB_CORRUPTION;
			});

		if (ret == DB_INTERRUPTED || thd_killed(m_user_thd)) {
			/* Do not report error since this could happen
			during shutdown */
			break;
		}
		if (ret != DB_SUCCESS) {
			/* Assume some kind of corruption. */
			push_warning_printf(
				thd, Sql_condition::SL_WARNING,
				ER_NOT_KEYFILE,
				"InnoDB: The B-tree of"
				" index %s is corrupted.",
				index->name());
			is_ok = false;
			dict_set_corrupted(
				index, m_prebuilt->trx, "CHECK TABLE-check index");
		}

		if (index == dict_table_get_first_index(m_prebuilt->table)) {
			n_rows_in_table = n_rows;
		} else if (!(index->type & DICT_FTS)
			   && (n_rows != n_rows_in_table)) {
			push_warning_printf(
				thd, Sql_condition::SL_WARNING,
				ER_NOT_KEYFILE,
				"InnoDB: Index '%-.200s' contains %lu"
				" entries, should be %lu.",
				index->name(),
				(ulong) n_rows,
				(ulong) n_rows_in_table);
			is_ok = false;
			dict_set_corrupted(
				index, m_prebuilt->trx,
				"CHECK TABLE; Wrong count");
		}
	}

	/* Restore the original isolation level */
	m_prebuilt->trx->isolation_level = old_isolation_level;
#if defined UNIV_AHI_DEBUG || defined UNIV_DEBUG
	/* We validate the whole adaptive hash index for all tables
	at every CHECK TABLE only when QUICK flag is not present. */

	if (!(check_opt->flags & T_QUICK) && !btr_search_validate()) {
		push_warning(thd, Sql_condition::SL_WARNING,
			     ER_NOT_KEYFILE,
			     "InnoDB: The adaptive hash index is corrupted.");
		is_ok = false;
	}
#endif /* defined UNIV_AHI_DEBUG || defined UNIV_DEBUG */
	m_prebuilt->trx->op_info = "";
	if (thd_killed(m_user_thd)) {
		thd_set_kill_status(m_user_thd);
	}

	if (UNIV_UNLIKELY(m_share && m_share->ib_table
			  && m_share->ib_table->is_corrupt)) {
		DBUG_RETURN(HA_ADMIN_CORRUPT);
	}

	DBUG_RETURN(is_ok ? HA_ADMIN_OK : HA_ADMIN_CORRUPT);
}

/*******************************************************************//**
Gets the foreign key create info for a table stored in InnoDB.
@return own: character string in the form which can be inserted to the
CREATE TABLE statement, MUST be freed with
ha_innobase::free_foreign_key_create_info */

char*
ha_innobase::get_foreign_key_create_info(void)
/*==========================================*/
{
	ut_a(m_prebuilt != NULL);

	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(ha_thd());

	m_prebuilt->trx->op_info = (char*)"getting info on foreign keys";

	/* In case MySQL calls this in the middle of a SELECT query,
	release possible adaptive hash latch to avoid
	deadlocks of threads */

	trx_search_latch_release_if_reserved(m_prebuilt->trx);

	if (!srv_read_only_mode) {
		mutex_enter(&srv_dict_tmpfile_mutex);

		rewind(srv_dict_tmpfile);

		/* Output the data to a temporary file */
		dict_print_info_on_foreign_keys(
			TRUE, srv_dict_tmpfile, m_prebuilt->trx,
			m_prebuilt->table);

		m_prebuilt->trx->op_info = (char*)"";

		long	flen = ftell(srv_dict_tmpfile);

		if (flen < 0) {
			flen = 0;
		}

		/* Allocate buffer for the string, and
		read the contents of the temporary file */

		char*	str = 0;

		str = reinterpret_cast<char*>(
			my_malloc(PSI_INSTRUMENT_ME, flen + 1, MYF(0)));

		if (str != NULL) {
			rewind(srv_dict_tmpfile);

			flen = (uint) fread(str, 1, flen, srv_dict_tmpfile);

			str[flen] = 0;
		}

		mutex_exit(&srv_dict_tmpfile_mutex);

		return(str);
	}

	return(NULL);
}


/***********************************************************************//**
Maps a InnoDB foreign key constraint to a equivalent MySQL foreign key info.
@return pointer to foreign key info */
static
FOREIGN_KEY_INFO*
get_foreign_key_info(
/*=================*/
	THD*			thd,	/*!< in: user thread handle */
	dict_foreign_t*		foreign)/*!< in: foreign key constraint */
{
	FOREIGN_KEY_INFO	f_key_info;
	FOREIGN_KEY_INFO*	pf_key_info;
	uint			i = 0;
	size_t			len;
	char			tmp_buff[NAME_LEN+1];
	char			name_buff[NAME_LEN+1];
	const char*		ptr;
	LEX_STRING*		referenced_key_name;
	LEX_STRING*		name = NULL;

	ptr = dict_remove_db_name(foreign->id);
	f_key_info.foreign_id = thd_make_lex_string(
		thd, 0, ptr, (uint) strlen(ptr), 1);

	/* Name format: database name, '/', table name, '\0' */

	/* Referenced (parent) database name */
	len = dict_get_db_name_len(foreign->referenced_table_name);
	ut_a(len < sizeof(tmp_buff));
	ut_memcpy(tmp_buff, foreign->referenced_table_name, len);
	tmp_buff[len] = 0;

	len = filename_to_tablename(tmp_buff, name_buff, sizeof(name_buff));
	f_key_info.referenced_db = thd_make_lex_string(
		thd, 0, name_buff, static_cast<unsigned int>(len), 1);

	/* Referenced (parent) table name */
	ptr = dict_remove_db_name(foreign->referenced_table_name);
	len = filename_to_tablename(ptr, name_buff, sizeof(name_buff));
	f_key_info.referenced_table = thd_make_lex_string(
		thd, 0, name_buff, static_cast<unsigned int>(len), 1);

	/* Dependent (child) database name */
	len = dict_get_db_name_len(foreign->foreign_table_name);
	ut_a(len < sizeof(tmp_buff));
	ut_memcpy(tmp_buff, foreign->foreign_table_name, len);
	tmp_buff[len] = 0;

	len = filename_to_tablename(tmp_buff, name_buff, sizeof(name_buff));
	f_key_info.foreign_db = thd_make_lex_string(
		thd, 0, name_buff, static_cast<unsigned int>(len), 1);

	/* Dependent (child) table name */
	ptr = dict_remove_db_name(foreign->foreign_table_name);
	len = filename_to_tablename(ptr, name_buff, sizeof(name_buff));
	f_key_info.foreign_table = thd_make_lex_string(
		thd, 0, name_buff, static_cast<unsigned int>(len), 1);

	do {
		ptr = foreign->foreign_col_names[i];
		name = thd_make_lex_string(thd, name, ptr,
					   (uint) strlen(ptr), 1);
		f_key_info.foreign_fields.push_back(name);
		ptr = foreign->referenced_col_names[i];
		name = thd_make_lex_string(thd, name, ptr,
					   (uint) strlen(ptr), 1);
		f_key_info.referenced_fields.push_back(name);
	} while (++i < foreign->n_fields);

	if (foreign->type & DICT_FOREIGN_ON_DELETE_CASCADE) {
		len = 7;
		ptr = "CASCADE";
	} else if (foreign->type & DICT_FOREIGN_ON_DELETE_SET_NULL) {
		len = 8;
		ptr = "SET NULL";
	} else if (foreign->type & DICT_FOREIGN_ON_DELETE_NO_ACTION) {
		len = 9;
		ptr = "NO ACTION";
	} else {
		len = 8;
		ptr = "RESTRICT";
	}

	f_key_info.delete_method = thd_make_lex_string(
		thd, f_key_info.delete_method, ptr,
		static_cast<unsigned int>(len), 1);

	if (foreign->type & DICT_FOREIGN_ON_UPDATE_CASCADE) {
		len = 7;
		ptr = "CASCADE";
	} else if (foreign->type & DICT_FOREIGN_ON_UPDATE_SET_NULL) {
		len = 8;
		ptr = "SET NULL";
	} else if (foreign->type & DICT_FOREIGN_ON_UPDATE_NO_ACTION) {
		len = 9;
		ptr = "NO ACTION";
	} else {
		len = 8;
		ptr = "RESTRICT";
	}

	f_key_info.update_method = thd_make_lex_string(
		thd, f_key_info.update_method, ptr,
		static_cast<unsigned int>(len), 1);

	if (foreign->referenced_index
	    && foreign->referenced_index->name != NULL) {
		referenced_key_name = thd_make_lex_string(
			thd,
			f_key_info.referenced_key_name,
			foreign->referenced_index->name,
			(uint) strlen(foreign->referenced_index->name),
			1);
	} else {
		referenced_key_name = NULL;
	}

	f_key_info.referenced_key_name = referenced_key_name;

	pf_key_info = (FOREIGN_KEY_INFO*) thd_memdup(thd, &f_key_info,
						      sizeof(FOREIGN_KEY_INFO));

	return(pf_key_info);
}

/*******************************************************************//**
Gets the list of foreign keys in this table.
@return always 0, that is, always succeeds */

int
ha_innobase::get_foreign_key_list(
/*==============================*/
	THD*			thd,		/*!< in: user thread handle */
	List<FOREIGN_KEY_INFO>*	f_key_list)	/*!< out: foreign key list */
{
	update_thd(ha_thd());

	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	m_prebuilt->trx->op_info = "getting list of foreign keys";

	mutex_enter(&dict_sys->mutex);

	for (dict_foreign_set::iterator it
		= m_prebuilt->table->foreign_set.begin();
	     it != m_prebuilt->table->foreign_set.end();
	     ++it) {

		FOREIGN_KEY_INFO*	pf_key_info;
		dict_foreign_t*		foreign = *it;

		pf_key_info = get_foreign_key_info(thd, foreign);

		if (pf_key_info != NULL) {
			f_key_list->push_back(pf_key_info);
		}
	}

	mutex_exit(&dict_sys->mutex);

	m_prebuilt->trx->op_info = "";

	return(0);
}

/*******************************************************************//**
Gets the set of foreign keys where this table is the referenced table.
@return always 0, that is, always succeeds */

int
ha_innobase::get_parent_foreign_key_list(
/*=====================================*/
	THD*			thd,		/*!< in: user thread handle */
	List<FOREIGN_KEY_INFO>*	f_key_list)	/*!< out: foreign key list */
{
	update_thd(ha_thd());

	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	m_prebuilt->trx->op_info = "getting list of referencing foreign keys";

	mutex_enter(&dict_sys->mutex);

	for (dict_foreign_set::iterator it
		= m_prebuilt->table->referenced_set.begin();
	     it != m_prebuilt->table->referenced_set.end();
	     ++it) {

		FOREIGN_KEY_INFO*	pf_key_info;
		dict_foreign_t*		foreign = *it;

		pf_key_info = get_foreign_key_info(thd, foreign);

		if (pf_key_info != NULL) {
			f_key_list->push_back(pf_key_info);
		}
	}

	mutex_exit(&dict_sys->mutex);

	m_prebuilt->trx->op_info = "";

	return(0);
}

/** Table list item structure is used to store only the table
and name. It is used by get_cascade_foreign_key_table_list to store
the intermediate result for fetching the table set. */
struct table_list_item {
	/** InnoDB table object */
	const dict_table_t*	table;
	/** Table name */
	const char*		name;
};

/** Structure to compare two st_tablename objects using their
db and tablename. It is used in the ordering of cascade_fk_set.
It returns true if the first argument precedes the second argument
and false otherwise. */
struct tablename_compare {

	bool operator()(const st_handler_tablename lhs,
			const st_handler_tablename rhs) const
	{
		int cmp = strcmp(lhs.db, rhs.db);
		if (cmp == 0) {
			cmp = strcmp(lhs.tablename, rhs.tablename);
		}

		return(cmp < 0);
	}
};

/** Get the table name and database name for the given table.
@param[in,out]	thd		user thread handle
@param[out]	f_key_info	pointer to table_name_info object
@param[in]	foreign		foreign key constraint. */
static
void
get_table_name_info(
	THD*			thd,
	st_handler_tablename*	f_key_info,
	const dict_foreign_t*	foreign)
{
	char	tmp_buff[NAME_CHAR_LEN * FILENAME_CHARSET_MBMAXLEN + 1];
	char	name_buff[NAME_CHAR_LEN * FILENAME_CHARSET_MBMAXLEN + 1];
	const char*	ptr;

	size_t  len = dict_get_db_name_len(
		foreign->referenced_table_name_lookup);
	ut_memcpy(tmp_buff, foreign->referenced_table_name_lookup, len);
	tmp_buff[len] = 0;

	ut_ad(len < sizeof(tmp_buff));

	len = filename_to_tablename(tmp_buff, name_buff, sizeof(name_buff));
	f_key_info->db = thd_strmake(thd, name_buff, len);

	ptr = dict_remove_db_name(foreign->referenced_table_name_lookup);
	len = filename_to_tablename(ptr, name_buff, sizeof(name_buff));
	f_key_info->tablename = thd_strmake(thd, name_buff, len);
}

/** Get the list of tables ordered by the dependency on the other tables using
the 'CASCADE' foreign key constraint.
@param[in,out]	thd		user thread handle
@param[out]	fk_table_list	set of tables name info for the
				dependent table
@retval 0 for success. */
int
ha_innobase::get_cascade_foreign_key_table_list(
	THD*				thd,
	List<st_handler_tablename>*	fk_table_list)
{
	TrxInInnoDB	trx_in_innodb(m_prebuilt->trx);

	m_prebuilt->trx->op_info = "getting cascading foreign keys";

	std::list<table_list_item, ut_allocator<table_list_item> > table_list;

	typedef std::set<st_handler_tablename, tablename_compare,
			 ut_allocator<st_handler_tablename> >	cascade_fk_set;

	cascade_fk_set	fk_set;

	mutex_enter(&dict_sys->mutex);

	/* Initialize the table_list with prebuilt->table name. */
	struct table_list_item	item = {m_prebuilt->table,
					m_prebuilt->table->name.m_name};

	table_list.push_back(item);

	/* Get the parent table, grand parent table info from the
	table list by depth-first traversal. */
	do {
		const dict_table_t*			parent_table;
		dict_table_t*				parent = NULL;
		std::pair<cascade_fk_set::iterator,bool>	ret;

		item = table_list.back();
		table_list.pop_back();
		parent_table = item.table;

		if (parent_table == NULL) {

			ut_ad(item.name != NULL);

			parent_table = parent = dict_table_open_on_name(
					item.name, TRUE, FALSE,
					DICT_ERR_IGNORE_NONE);

			if (parent_table == NULL) {
				/* foreign_key_checks is or was probably
				disabled; ignore the constraint */
				continue;
			}
		}

		for (dict_foreign_set::const_iterator it =
		     parent_table->foreign_set.begin();
		     it != parent_table->foreign_set.end(); ++it) {

			const dict_foreign_t*	foreign = *it;
			st_handler_tablename	f1;

			/* Skip the table if there is no
			cascading operation. */
			if (0 == (foreign->type
				  & ~(DICT_FOREIGN_ON_DELETE_NO_ACTION
				      | DICT_FOREIGN_ON_UPDATE_NO_ACTION))) {
				continue;
			}

			if (foreign->referenced_table_name_lookup != NULL) {
				get_table_name_info(thd, &f1, foreign);
				ret = fk_set.insert(f1);

				/* Ignore the table if it is already
				in the set. */
				if (!ret.second) {
					continue;
				}

				struct table_list_item	item1 = {
					foreign->referenced_table,
					foreign->referenced_table_name_lookup};

				table_list.push_back(item1);

				st_handler_tablename*	fk_table =
					(st_handler_tablename*) thd_memdup(
						thd, &f1, sizeof(*fk_table));

				fk_table_list->push_back(fk_table);
			}
		}

		if (parent != NULL) {
			dict_table_close(parent, true, false);
		}

	} while(!table_list.empty());

	mutex_exit(&dict_sys->mutex);

	m_prebuilt->trx->op_info = "";

	return(0);
}

/*****************************************************************//**
Checks if ALTER TABLE may change the storage engine of the table.
Changing storage engines is not allowed for tables for which there
are foreign key constraints (parent or child tables).
@return TRUE if can switch engines */

bool
ha_innobase::can_switch_engines(void)
/*=================================*/
{
	DBUG_ENTER("ha_innobase::can_switch_engines");

	update_thd();

	m_prebuilt->trx->op_info =
			"determining if there are foreign key constraints";

	row_mysql_freeze_data_dictionary(m_prebuilt->trx);

	bool	can_switch = m_prebuilt->table->referenced_set.empty()
		&& m_prebuilt->table->foreign_set.empty();

	row_mysql_unfreeze_data_dictionary(m_prebuilt->trx);
	m_prebuilt->trx->op_info = "";

	DBUG_RETURN(can_switch);
}

/*******************************************************************//**
Checks if a table is referenced by a foreign key. The MySQL manual states that
a REPLACE is either equivalent to an INSERT, or DELETE(s) + INSERT. Only a
delete is then allowed internally to resolve a duplicate key conflict in
REPLACE, not an update.
@return > 0 if referenced by a FOREIGN KEY */

uint
ha_innobase::referenced_by_foreign_key(void)
/*========================================*/
{
	if (dict_table_is_referenced_by_foreign_key(m_prebuilt->table)) {

		return(1);
	}

	return(0);
}

/*******************************************************************//**
Frees the foreign key create info for a table stored in InnoDB, if it is
non-NULL. */

void
ha_innobase::free_foreign_key_create_info(
/*======================================*/
	char*	str)	/*!< in, own: create info string to free */
{
	if (str != NULL) {
		my_free(str);
	}
}

/*******************************************************************//**
Tells something additional to the handler about how to do things.
@return 0 or error number */

int
ha_innobase::extra(
/*===============*/
	enum ha_extra_function operation)
			   /*!< in: HA_EXTRA_FLUSH or some other flag */
{
	check_trx_exists(ha_thd());

	/* Warning: since it is not sure that MySQL calls external_lock
	before calling this function, the trx field in m_prebuilt can be
	obsolete! */

	switch (operation) {
	case HA_EXTRA_FLUSH:
		if (m_prebuilt->blob_heap) {
			row_mysql_prebuilt_free_blob_heap(m_prebuilt);
		}
		break;
	case HA_EXTRA_RESET_STATE:
		reset_template();
		thd_to_trx(ha_thd())->duplicates = 0;
		break;
	case HA_EXTRA_NO_KEYREAD:
		m_prebuilt->read_just_key = 0;
		break;
	case HA_EXTRA_KEYREAD:
		m_prebuilt->read_just_key = 1;
		break;
	case HA_EXTRA_KEYREAD_PRESERVE_FIELDS:
		m_prebuilt->keep_other_fields_on_keyread = 1;
		break;

		/* IMPORTANT: m_prebuilt->trx can be obsolete in
		this method, because it is not sure that MySQL
		calls external_lock before this method with the
		parameters below.  We must not invoke update_thd()
		either, because the calling threads may change.
		CAREFUL HERE, OR MEMORY CORRUPTION MAY OCCUR! */
	case HA_EXTRA_INSERT_WITH_UPDATE:
		thd_to_trx(ha_thd())->duplicates |= TRX_DUP_IGNORE;
		break;
	case HA_EXTRA_NO_IGNORE_DUP_KEY:
		thd_to_trx(ha_thd())->duplicates &= ~TRX_DUP_IGNORE;
		break;
	case HA_EXTRA_WRITE_CAN_REPLACE:
		thd_to_trx(ha_thd())->duplicates |= TRX_DUP_REPLACE;
		break;
	case HA_EXTRA_WRITE_CANNOT_REPLACE:
		thd_to_trx(ha_thd())->duplicates &= ~TRX_DUP_REPLACE;
		break;
	default:/* Do nothing */
		;
	}

	return(0);
}

/**
MySQL calls this method at the end of each statement. This method
exists for readability only. ha_innobase::reset() doesn't give any
clue about the method. */

int
ha_innobase::end_stmt()
{
	if (m_prebuilt->blob_heap) {
		row_mysql_prebuilt_free_blob_heap(m_prebuilt);
	}

	reset_template();

	m_ds_mrr.reset();

	/* TODO: This should really be reset in reset_template() but for now
	it's safer to do it explicitly here. */

	/* This is a statement level counter. */
	m_prebuilt->autoinc_last_value = 0;

	/* This transaction had called ha_innobase::start_stmt() */
	trx_t*	trx = m_prebuilt->trx;

	if (trx->lock.start_stmt) {
		TrxInInnoDB::end_stmt(trx);

		trx->lock.start_stmt = false;
	}

	return(0);
}

/**
MySQL calls this method at the end of each statement */

int
ha_innobase::reset()
{
	return(end_stmt());
}

/******************************************************************//**
MySQL calls this function at the start of each SQL statement inside LOCK
TABLES. Inside LOCK TABLES the ::external_lock method does not work to
mark SQL statement borders. Note also a special case: if a temporary table
is created inside LOCK TABLES, MySQL has not called external_lock() at all
on that table.
MySQL-5.0 also calls this before each statement in an execution of a stored
procedure. To make the execution more deterministic for binlogging, MySQL-5.0
locks all tables involved in a stored procedure with full explicit table
locks (thd_in_lock_tables(thd) holds in store_lock()) before executing the
procedure.
@return 0 or error code */

int
ha_innobase::start_stmt(
/*====================*/
	THD*		thd,	/*!< in: handle to the user thread */
	thr_lock_type	lock_type)
{
	trx_t*		trx = m_prebuilt->trx;

	DBUG_ENTER("ha_innobase::start_stmt");

	update_thd(thd);

	ut_ad(m_prebuilt->table != NULL);

	TrxInInnoDB	trx_in_innodb(trx);

	if (dict_table_is_intrinsic(m_prebuilt->table)) {

		if (thd_sql_command(thd) == SQLCOM_ALTER_TABLE) {

			DBUG_RETURN(HA_ERR_WRONG_COMMAND);
		}

		DBUG_RETURN(0);
	}

	trx = m_prebuilt->trx;

	innobase_srv_conc_force_exit_innodb(trx);

	/* Reset the AUTOINC statement level counter for multi-row INSERTs. */
	trx->n_autoinc_rows = 0;

	m_prebuilt->sql_stat_start = TRUE;
	m_prebuilt->hint_need_to_fetch_extra_cols = 0;
	reset_template();

	if (dict_table_is_temporary(m_prebuilt->table)
	    && m_mysql_has_locked
	    && m_prebuilt->select_lock_type == LOCK_NONE) {
		dberr_t error;

		switch (thd_sql_command(thd)) {
		case SQLCOM_INSERT:
		case SQLCOM_UPDATE:
		case SQLCOM_DELETE:
			init_table_handle_for_HANDLER();
			m_prebuilt->select_lock_type = LOCK_X;
			m_prebuilt->stored_select_lock_type = LOCK_X;
			error = row_lock_table_for_mysql(m_prebuilt, NULL, 1);

			if (error != DB_SUCCESS) {
				int	st = convert_error_code_to_mysql(
					error, 0, thd);
				DBUG_RETURN(st);
			}
			break;
		}
	}

	if (!m_mysql_has_locked) {
		/* This handle is for a temporary table created inside
		this same LOCK TABLES; since MySQL does NOT call external_lock
		in this case, we must use x-row locks inside InnoDB to be
		prepared for an update of a row */

		m_prebuilt->select_lock_type = LOCK_X;

	} else if (trx->isolation_level != TRX_ISO_SERIALIZABLE
		   && thd_sql_command(thd) == SQLCOM_SELECT
		   && lock_type == TL_READ) {

		/* For other than temporary tables, we obtain
		no lock for consistent read (plain SELECT). */

		m_prebuilt->select_lock_type = LOCK_NONE;
	} else {
		/* Not a consistent read: restore the
		select_lock_type value. The value of
		stored_select_lock_type was decided in:
		1) ::store_lock(),
		2) ::external_lock(),
		3) ::init_table_handle_for_HANDLER(). */

		ut_a(m_prebuilt->stored_select_lock_type != LOCK_NONE_UNSET);

		m_prebuilt->select_lock_type =
			m_prebuilt->stored_select_lock_type;
	}

	*trx->detailed_error = 0;

	innobase_register_trx(ht, thd, trx);

	if (!trx_is_started(trx)) {
		++trx->will_lock;
	}

	/* Only do it once per transaction. */
	if (!trx->lock.start_stmt && lock_type != TL_UNLOCK) {

		TrxInInnoDB::begin_stmt(trx);

		trx->lock.start_stmt = true;
	}

	DBUG_RETURN(0);
}

/******************************************************************//**
Maps a MySQL trx isolation level code to the InnoDB isolation level code
@return InnoDB isolation level */
static inline
ulint
innobase_map_isolation_level(
/*=========================*/
	enum_tx_isolation	iso)	/*!< in: MySQL isolation level code */
{
	switch (iso) {
	case ISO_REPEATABLE_READ:	return(TRX_ISO_REPEATABLE_READ);
	case ISO_READ_COMMITTED:	return(TRX_ISO_READ_COMMITTED);
	case ISO_SERIALIZABLE:		return(TRX_ISO_SERIALIZABLE);
	case ISO_READ_UNCOMMITTED:	return(TRX_ISO_READ_UNCOMMITTED);
	}

	ut_error;

	return(0);
}

/******************************************************************//**
As MySQL will execute an external lock for every new table it uses when it
starts to process an SQL statement (an exception is when MySQL calls
start_stmt for the handle) we can use this function to store the pointer to
the THD in the handle. We will also use this function to communicate
to InnoDB that a new SQL statement has started and that we must store a
savepoint to our transaction handle, so that we are able to roll back
the SQL statement in case of an error.
@return 0 */

int
ha_innobase::external_lock(
/*=======================*/
	THD*	thd,		/*!< in: handle to the user thread */
	int	lock_type)	/*!< in: lock type */
{
	DBUG_ENTER("ha_innobase::external_lock");
	DBUG_PRINT("enter",("lock_type: %d", lock_type));

	update_thd(thd);

	trx_t*		trx = m_prebuilt->trx;

	ut_ad(m_prebuilt->table);

	if (dict_table_is_intrinsic(m_prebuilt->table)) {

		if (thd_sql_command(thd) == SQLCOM_ALTER_TABLE) {

			DBUG_RETURN(HA_ERR_WRONG_COMMAND);
		}

		TrxInInnoDB::begin_stmt(trx);

		DBUG_RETURN(0);
	}

	/* Statement based binlogging does not work in isolation level
	READ UNCOMMITTED and READ COMMITTED since the necessary
	locks cannot be taken. In this case, we print an
	informative error message and return with an error.
	Note: decide_logging_format would give the same error message,
	except it cannot give the extra details. */

	if (lock_type == F_WRLCK
	    && !(table_flags() & HA_BINLOG_STMT_CAPABLE)
	    && thd_binlog_format(thd) == BINLOG_FORMAT_STMT
	    && thd_binlog_filter_ok(thd)
	    && thd_sqlcom_can_generate_row_events(thd)) {

		bool	skip = false;

		/* used by test case */
		DBUG_EXECUTE_IF("no_innodb_binlog_errors", skip = true;);

		if (!skip) {

			my_error(ER_BINLOG_STMT_MODE_AND_ROW_ENGINE, MYF(0),
			         " InnoDB is limited to row-logging when"
			         " transaction isolation level is"
			         " READ COMMITTED or READ UNCOMMITTED.");

			DBUG_RETURN(HA_ERR_LOGGING_IMPOSSIBLE);
		}
	}

	/* Check for UPDATEs in read-only mode. */
	if (srv_read_only_mode
	    && (thd_sql_command(thd) == SQLCOM_UPDATE
		|| thd_sql_command(thd) == SQLCOM_INSERT
		|| thd_sql_command(thd) == SQLCOM_REPLACE
		|| thd_sql_command(thd) == SQLCOM_DROP_TABLE
		|| thd_sql_command(thd) == SQLCOM_ALTER_TABLE
		|| thd_sql_command(thd) == SQLCOM_OPTIMIZE
		|| (thd_sql_command(thd) == SQLCOM_CREATE_TABLE
		    && lock_type == F_WRLCK)
		|| thd_sql_command(thd) == SQLCOM_CREATE_INDEX
		|| thd_sql_command(thd) == SQLCOM_DROP_INDEX
		|| thd_sql_command(thd) == SQLCOM_DELETE)) {

		if (thd_sql_command(thd) == SQLCOM_CREATE_TABLE) {
			ib_senderrf(thd, IB_LOG_LEVEL_WARN,
				    ER_INNODB_READ_ONLY);
			DBUG_RETURN(HA_ERR_INNODB_READ_ONLY);
		} else {
			ib_senderrf(thd, IB_LOG_LEVEL_WARN,
				    ER_READ_ONLY_MODE);
			DBUG_RETURN(HA_ERR_TABLE_READONLY);
		}
	}

	m_prebuilt->sql_stat_start = TRUE;
	m_prebuilt->hint_need_to_fetch_extra_cols = 0;

	reset_template();

	switch (m_prebuilt->table->quiesce) {
	case QUIESCE_START:
		/* Check for FLUSH TABLE t WITH READ LOCK; */
		if (!srv_read_only_mode
		    && thd_sql_command(thd) == SQLCOM_FLUSH
		    && lock_type == F_RDLCK) {

			row_quiesce_table_start(m_prebuilt->table, trx);

			/* Use the transaction instance to track UNLOCK
			TABLES. It can be done via START TRANSACTION; too
			implicitly. */

			++trx->flush_tables;
		}
		break;

	case QUIESCE_COMPLETE:
		/* Check for UNLOCK TABLES; implicit or explicit
		or trx interruption. */
		if (trx->flush_tables > 0
		    && (lock_type == F_UNLCK || trx_is_interrupted(trx))) {

			row_quiesce_table_complete(m_prebuilt->table, trx);

			ut_a(trx->flush_tables > 0);
			--trx->flush_tables;
		}

		break;

	case QUIESCE_NONE:
		break;
	}

	if (lock_type == F_WRLCK) {

		/* If this is a SELECT, then it is in UPDATE TABLE ...
		or SELECT ... FOR UPDATE */
		m_prebuilt->select_lock_type = LOCK_X;
		m_prebuilt->stored_select_lock_type = LOCK_X;
	}

	if (lock_type != F_UNLCK) {
		/* MySQL is setting a new table lock */

		*trx->detailed_error = 0;

		innobase_register_trx(ht, thd, trx);

		if (trx->isolation_level == TRX_ISO_SERIALIZABLE
		    && m_prebuilt->select_lock_type == LOCK_NONE
		    && thd_test_options(
			    thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

			/* To get serializable execution, we let InnoDB
			conceptually add 'LOCK IN SHARE MODE' to all SELECTs
			which otherwise would have been consistent reads. An
			exception is consistent reads in the AUTOCOMMIT=1 mode:
			we know that they are read-only transactions, and they
			can be serialized also if performed as consistent
			reads. */

			m_prebuilt->select_lock_type = LOCK_S;
			m_prebuilt->stored_select_lock_type = LOCK_S;
		}

		/* Starting from 4.1.9, no InnoDB table lock is taken in LOCK
		TABLES if AUTOCOMMIT=1. It does not make much sense to acquire
		an InnoDB table lock if it is released immediately at the end
		of LOCK TABLES, and InnoDB's table locks in that case cause
		VERY easily deadlocks.

		We do not set InnoDB table locks if user has not explicitly
		requested a table lock. Note that thd_in_lock_tables(thd)
		can hold in some cases, e.g., at the start of a stored
		procedure call (SQLCOM_CALL). */

		if (m_prebuilt->select_lock_type != LOCK_NONE) {

			if (thd_sql_command(thd) == SQLCOM_LOCK_TABLES
			    && THDVAR(thd, table_locks)
			    && thd_test_options(thd, OPTION_NOT_AUTOCOMMIT)
			    && thd_in_lock_tables(thd)) {

				dberr_t	error = row_lock_table_for_mysql(
					m_prebuilt, NULL, 0);

				if (error != DB_SUCCESS) {

					DBUG_RETURN(
						convert_error_code_to_mysql(
							error, 0, thd));
				}
			}

			trx->mysql_n_tables_locked++;
		}

		trx->n_mysql_tables_in_use++;
		m_mysql_has_locked = true;

		if (!trx_is_started(trx)
		    && (m_prebuilt->select_lock_type != LOCK_NONE
			|| m_prebuilt->stored_select_lock_type != LOCK_NONE)) {

			++trx->will_lock;
		}

		TrxInInnoDB::begin_stmt(trx);

#ifdef UNIV_DEBUG
		if (thd_trx_is_dd_trx(thd)) {
			trx->is_dd_trx = true;
		}
#endif /* UNIV_DEBUG */
		DBUG_RETURN(0);
	} else {

		TrxInInnoDB::end_stmt(trx);

		DEBUG_SYNC_C("ha_innobase_end_statement");
	}

	/* MySQL is releasing a table lock */

	trx->n_mysql_tables_in_use--;
	m_mysql_has_locked = false;

	innobase_srv_conc_force_exit_innodb(trx);

	/* If the MySQL lock count drops to zero we know that the current SQL
	statement has ended */

	if (trx->n_mysql_tables_in_use == 0) {

		if (UNIV_UNLIKELY(trx->take_stats)) {
			increment_thd_innodb_stats(thd,
						   (unsigned long long) trx->id,
						   trx->io_reads,
						   trx->io_read,
						   trx->io_reads_wait_timer,
						   trx->lock_que_wait_timer,
						   trx->innodb_que_wait_timer,
						   trx->distinct_page_access);

			trx->io_reads = 0;
			trx->io_read = 0;
			trx->io_reads_wait_timer = 0;
			trx->lock_que_wait_timer = 0;
			trx->innodb_que_wait_timer = 0;
			trx->distinct_page_access = 0;
			if (trx->distinct_page_access_hash)
				memset(trx->distinct_page_access_hash, 0,
				       DPAH_SIZE);
		}

		trx->mysql_n_tables_locked = 0;
		m_prebuilt->used_in_HANDLER = FALSE;

		if (!thd_test_options(
				thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

			if (trx_is_started(trx)) {

				innobase_commit(ht, thd, TRUE);
			} else {
				/* Since the trx state is TRX_NOT_STARTED,
				trx_commit() will not be called. Reset
				trx->is_dd_trx here */
				ut_d(trx->is_dd_trx = false);
			}

		} else if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
			   && MVCC::is_view_active(trx->read_view)) {

			mutex_enter(&trx_sys->mutex);

			trx_sys->mvcc->view_close(trx->read_view, true);

			mutex_exit(&trx_sys->mutex);
		}
	}

	if (!trx_is_started(trx)
	    && lock_type != F_UNLCK
	    && (m_prebuilt->select_lock_type != LOCK_NONE
		|| m_prebuilt->stored_select_lock_type != LOCK_NONE)) {

		++trx->will_lock;
	}

	DBUG_RETURN(0);
}

/************************************************************************//**
Here we export InnoDB status variables to MySQL. */
static
void
innodb_export_status()
/*==================*/
{
	if (innodb_inited) {
		srv_export_innodb_status();
	}
}

/************************************************************************//**
Implements the SHOW ENGINE INNODB STATUS command. Sends the output of the
InnoDB Monitor to the client.
@return 0 on success */
static
int
innodb_show_status(
/*===============*/
	handlerton*	hton,	/*!< in: the innodb handlerton */
	THD*		thd,	/*!< in: the MySQL query thread of the caller */
	stat_print_fn*	stat_print)
{
	static const char	truncated_msg[] = "... truncated...\n";
	const long		MAX_STATUS_SIZE = 1048576;
	ulint			trx_list_start = ULINT_UNDEFINED;
	ulint			trx_list_end = ULINT_UNDEFINED;
	bool			ret_val;

	DBUG_ENTER("innodb_show_status");
	DBUG_ASSERT(hton == innodb_hton_ptr);

	/* We don't create the temp files or associated
	mutexes in read-only-mode */

	if (srv_read_only_mode) {
		DBUG_RETURN(0);
	}

	trx_t*	trx = check_trx_exists(thd);

	trx_search_latch_release_if_reserved(trx);

	innobase_srv_conc_force_exit_innodb(trx);

	TrxInInnoDB	trx_in_innodb(trx);

	/* We let the InnoDB Monitor to output at most MAX_STATUS_SIZE
	bytes of text. */

	char*	str;
	ssize_t	flen;

	mutex_enter(&srv_monitor_file_mutex);
	rewind(srv_monitor_file);

	srv_printf_innodb_monitor(srv_monitor_file, FALSE,
				  &trx_list_start, &trx_list_end);

	os_file_set_eof(srv_monitor_file);

	if ((flen = ftell(srv_monitor_file)) < 0) {
		flen = 0;
	}

	ssize_t	usable_len;

	if (flen > MAX_STATUS_SIZE) {
		usable_len = MAX_STATUS_SIZE;
		srv_truncated_status_writes++;
	} else {
		usable_len = flen;
	}

	/* allocate buffer for the string, and
	read the contents of the temporary file */

	if (!(str = (char*) my_malloc(PSI_INSTRUMENT_ME,
                                      usable_len + 1, MYF(0)))) {
		mutex_exit(&srv_monitor_file_mutex);
		DBUG_RETURN(1);
	}

	rewind(srv_monitor_file);

	if (flen < MAX_STATUS_SIZE) {
		/* Display the entire output. */
		flen = fread(str, 1, flen, srv_monitor_file);
	} else if (trx_list_end < (ulint) flen
		   && trx_list_start < trx_list_end
		   && trx_list_start + (flen - trx_list_end)
		   < MAX_STATUS_SIZE - sizeof truncated_msg - 1) {

		/* Omit the beginning of the list of active transactions. */
		ssize_t	len = fread(str, 1, trx_list_start, srv_monitor_file);

		memcpy(str + len, truncated_msg, sizeof truncated_msg - 1);
		len += sizeof truncated_msg - 1;
		usable_len = (MAX_STATUS_SIZE - 1) - len;
		fseek(srv_monitor_file,
		      static_cast<long>(flen - usable_len), SEEK_SET);
		len += fread(str + len, 1, usable_len, srv_monitor_file);
		flen = len;
	} else {
		/* Omit the end of the output. */
		flen = fread(str, 1, MAX_STATUS_SIZE - 1, srv_monitor_file);
	}

	mutex_exit(&srv_monitor_file_mutex);

	ret_val= stat_print(
		thd, innobase_hton_name,
		static_cast<uint>(strlen(innobase_hton_name)),
		STRING_WITH_LEN(""), str, static_cast<uint>(flen));

	my_free(str);

	DBUG_RETURN(ret_val);
}

/** Callback for collecting mutex statistics */
struct ShowStatus {

	/** For tracking the mutex metrics */
	struct Value {

		/** Constructor
		@param[in]	name		Name of the mutex
		@param[in]	spins		Number of spins
		@param[in]	os_waits	OS waits so far
		@param[in]	calls		Number of calls to enter() */
		Value(const char*	name,
		      ulint		spins,
		      uint64_t		waits,
		      uint64_t		calls)
			:
			m_name(name),
			m_spins(spins),
			m_waits(waits),
			m_calls(calls)
		{
			/* No op */
		}

		/** Mutex name */
		std::string		m_name;

		/** Spins so far */
		ulint			m_spins;

		/** Waits so far */
		uint64_t		m_waits;

		/** Number of calls so far */
		uint64_t		m_calls;
	};

	/** Order by m_waits, in descending order. */
	struct OrderByWaits: public std::binary_function<Value, Value, bool>
	{
		/** @return true if rhs < lhs */
		bool operator()(
			const Value& lhs,
			const Value& rhs) const
			UNIV_NOTHROW
		{
			return(rhs.m_waits < lhs.m_waits);
		}
	};

	typedef std::vector<Value, ut_allocator<Value> > Values;

	/** Collect the individual latch counts */
	struct GetCount {
		typedef latch_meta_t::CounterType::Count Count;

		/** Constructor
		@param[in]	name		Latch name
		@param[in,out]	values		Put the values here */
		GetCount(
			const char*	name,
			Values*		values)
			UNIV_NOTHROW
			:
			m_name(name),
			m_values(values)
		{
			/* No op */
		}

		/** Collect the latch metrics. Ignore entries where the
		spins and waits are zero.
		@param[in]	count		The latch metrics */
		void operator()(Count* count)
			UNIV_NOTHROW
		{
			if (count->m_spins > 0 || count->m_waits > 0) {

				m_values->push_back(Value(
					m_name,
					count->m_spins,
					count->m_waits,
					count->m_calls));
			}
		}

		/** The latch name */
		const char*	m_name;

		/** For collecting the active mutex stats. */
		Values*		m_values;
	};

	/** Constructor */
	ShowStatus() { }

	/** Callback for collecting the stats
	@param[in]	latch_meta		Latch meta data
	@return always returns true */
	bool operator()(latch_meta_t& latch_meta)
		UNIV_NOTHROW
	{
		latch_meta_t::CounterType*	counter;

		counter = latch_meta.get_counter();

		GetCount	get_count(latch_meta.get_name(), &m_values);

		counter->iterate(get_count);

		return(true);
	}

	/** Implements the SHOW MUTEX STATUS command, for mutexes.
	The table structure is like so: Engine | Mutex Name | Status
	We store the metrics  in the "Status" column as:

		spins=N,waits=N,calls=N"

	The user has to parse the dataunfortunately
	@param[in,out]	hton		the innodb handlerton
	@param[in,out]	thd		the MySQL query thread of the caller
	@param[in,out]	stat_print	function for printing statistics
	@return true on success. */
	bool to_string(
		handlerton*	hton,
		THD*		thd,
		stat_print_fn*	stat_print)
		UNIV_NOTHROW;

	/** For collecting the active mutex stats. */
	Values		m_values;
};

/** Implements the SHOW MUTEX STATUS command, for mutexes.
The table structure is like so: Engine | Mutex Name | Status
We store the metrics  in the "Status" column as:

	spins=N,waits=N,calls=N"

The user has to parse the dataunfortunately
@param[in,out]	hton		the innodb handlerton
@param[in,out]	thd		the MySQL query thread of the caller
@param[in,out]	stat_print	function for printing statistics
@return true on success. */
bool
ShowStatus::to_string(
	handlerton*	hton,
	THD*		thd,
	stat_print_fn*	stat_print)
	UNIV_NOTHROW
{
	uint		hton_name_len = (uint) strlen(innobase_hton_name);

	std::sort(m_values.begin(), m_values.end(), OrderByWaits());

	Values::iterator	end = m_values.end();

	for (Values::iterator it = m_values.begin(); it != end; ++it) {

		int	name_len;
		char	name_buf[IO_SIZE];

		name_len = ut_snprintf(
			name_buf, sizeof(name_buf), "%s", it->m_name.c_str());

		int	status_len;
		char	status_buf[IO_SIZE];

		status_len = ut_snprintf(
			status_buf, sizeof(status_buf),
			"spins=%lu,waits=%lu,calls=" TRX_ID_FMT,
			static_cast<ulong>(it->m_spins),
			static_cast<long>(it->m_waits),
			it->m_calls);

		if (stat_print(thd, innobase_hton_name,
			       hton_name_len,
			       name_buf, static_cast<uint>(name_len),
			       status_buf, static_cast<uint>(status_len))) {

			return(false);
		}
	}

	return(true);
}

/** Implements the SHOW MUTEX STATUS command, for mutexes.
@param[in,out]	hton		the innodb handlerton
@param[in,out]	thd		the MySQL query thread of the caller
@param[in,out]	stat_print	function for printing statistics
@return 0 on success. */
static
int
innodb_show_mutex_status(
	handlerton*	hton,
	THD*		thd,
	stat_print_fn*	stat_print)
{
	DBUG_ENTER("innodb_show_mutex_status");

	ShowStatus	collector;

	DBUG_ASSERT(hton == innodb_hton_ptr);

	mutex_monitor->iterate(collector);

	if (!collector.to_string(hton, thd, stat_print)) {
		DBUG_RETURN(1);
	}

	DBUG_RETURN(0);
}

/** Implements the SHOW MUTEX STATUS command.
@param[in,out]	hton		the innodb handlerton
@param[in,out]	thd		the MySQL query thread of the caller
@param[in,out]	stat_print	function for printing statistics
@return 0 on success. */
static
int
innodb_show_rwlock_status(
	handlerton*	hton,
	THD*		thd,
	stat_print_fn*	stat_print)
{
	DBUG_ENTER("innodb_show_rwlock_status");

	rw_lock_t*	block_rwlock = NULL;
	ulint		block_rwlock_oswait_count = 0;
	uint		hton_name_len = (uint) strlen(innobase_hton_name);

	DBUG_ASSERT(hton == innodb_hton_ptr);

	mutex_enter(&rw_lock_list_mutex);

	for (rw_lock_t* rw_lock = UT_LIST_GET_FIRST(rw_lock_list);
	     rw_lock != NULL;
	     rw_lock = UT_LIST_GET_NEXT(list, rw_lock)) {

		if (rw_lock->count_os_wait == 0) {
			continue;
		}

		int		buf1len;
		char		buf1[IO_SIZE];

		if (rw_lock->is_block_lock) {

			block_rwlock = rw_lock;
			block_rwlock_oswait_count += rw_lock->count_os_wait;

			continue;
		}

		buf1len = ut_snprintf(
			buf1, sizeof buf1, "rwlock: %s:%lu",
			innobase_basename(rw_lock->cfile_name),
			static_cast<ulong>(rw_lock->cline));

		int		buf2len;
		char		buf2[IO_SIZE];

		buf2len = ut_snprintf(
			buf2, sizeof buf2, "waits=%lu",
			static_cast<ulong>(rw_lock->count_os_wait));

		if (stat_print(thd, innobase_hton_name,
			       hton_name_len,
			       buf1, static_cast<uint>(buf1len),
			       buf2, static_cast<uint>(buf2len))) {

			mutex_exit(&rw_lock_list_mutex);

			DBUG_RETURN(1);
		}
	}

	if (block_rwlock != NULL) {

		int		buf1len;
		char		buf1[IO_SIZE];

		buf1len = ut_snprintf(
			buf1, sizeof buf1, "sum rwlock: %s:%lu",
			innobase_basename(block_rwlock->cfile_name),
			static_cast<ulong>(block_rwlock->cline));

		int		buf2len;
		char		buf2[IO_SIZE];

		buf2len = ut_snprintf(
			buf2, sizeof buf2, "waits=%lu",
			static_cast<ulong>(block_rwlock_oswait_count));

		if (stat_print(thd, innobase_hton_name,
			       hton_name_len,
			       buf1, static_cast<uint>(buf1len),
			       buf2, static_cast<uint>(buf2len))) {

			mutex_exit(&rw_lock_list_mutex);

			DBUG_RETURN(1);
		}
	}

	mutex_exit(&rw_lock_list_mutex);

	DBUG_RETURN(0);
}

/** Implements the SHOW MUTEX STATUS command.
@param[in,out]	hton		the innodb handlerton
@param[in,out]	thd		the MySQL query thread of the caller
@param[in,out]	stat_print	function for printing statistics
@return 0 on success. */
static
int
innodb_show_latch_status(
	handlerton*	hton,
	THD*		thd,
	stat_print_fn*	stat_print)
{
	int	ret = innodb_show_mutex_status(hton, thd, stat_print);

	if (ret != 0) {
		return(ret);
	}

	return(innodb_show_rwlock_status(hton, thd, stat_print));
}

/************************************************************************//**
Return 0 on success and non-zero on failure. Note: the bool return type
seems to be abused here, should be an int. */
static
bool
innobase_show_status(
/*=================*/
	handlerton*		hton,	/*!< in: the innodb handlerton */
	THD*			thd,	/*!< in: the MySQL query thread
					of the caller */
	stat_print_fn*		stat_print,
	enum ha_stat_type	stat_type)
{
	DBUG_ASSERT(hton == innodb_hton_ptr);

	switch (stat_type) {
	case HA_ENGINE_STATUS:
		/* Non-zero return value means there was an error. */
		return(innodb_show_status(hton, thd, stat_print) != 0);

	case HA_ENGINE_MUTEX:
		return(innodb_show_latch_status(hton, thd, stat_print) != 0);

	case HA_ENGINE_LOGS:
		/* Not handled */
		break;
	}

	/* Success */
	return(false);
}

/************************************************************************//**
Handling the shared INNOBASE_SHARE structure that is needed to provide table
locking. Register the table name if it doesn't exist in the hash table. */
static
INNOBASE_SHARE*
get_share(
/*======*/
	const char*	table_name)
{
	INNOBASE_SHARE*	share;

	mysql_mutex_lock(&innobase_share_mutex);

	ulint	fold = ut_fold_string(table_name);

	HASH_SEARCH(table_name_hash, innobase_open_tables, fold,
		    INNOBASE_SHARE*, share,
		    ut_ad(share->use_count > 0),
		    !strcmp(share->table_name, table_name));

	if (share == NULL) {

		uint length = (uint) strlen(table_name);

		/* TODO: invoke HASH_MIGRATE if innobase_open_tables
		grows too big */

		share = reinterpret_cast<INNOBASE_SHARE*>(
			my_malloc(PSI_INSTRUMENT_ME,
				  sizeof(*share) + length + 1,
				  MYF(MY_FAE | MY_ZEROFILL)));

		share->table_name = reinterpret_cast<char*>(
			memcpy(share + 1, table_name, length + 1));

		HASH_INSERT(INNOBASE_SHARE, table_name_hash,
			    innobase_open_tables, fold, share);

		/* Index translation table initialization */
		share->idx_trans_tbl.index_mapping = NULL;
		share->idx_trans_tbl.index_count = 0;
		share->idx_trans_tbl.array_size = 0;
	}

	++share->use_count;

	mysql_mutex_unlock(&innobase_share_mutex);

	return(share);
}

/************************************************************************//**
Free the shared object that was registered with get_share(). */
static
void
free_share(
/*=======*/
	INNOBASE_SHARE*	share)	/*!< in/own: table share to free */
{
	mysql_mutex_lock(&innobase_share_mutex);

#ifdef UNIV_DEBUG
	INNOBASE_SHARE* share2;
	ulint		fold = ut_fold_string(share->table_name);

	HASH_SEARCH(table_name_hash, innobase_open_tables, fold,
		    INNOBASE_SHARE*, share2,
		    ut_ad(share->use_count > 0),
		    !strcmp(share->table_name, share2->table_name));

	ut_a(share2 == share);
#endif /* UNIV_DEBUG */

	--share->use_count;

	if (share->use_count == 0) {
		ulint	fold = ut_fold_string(share->table_name);

		HASH_DELETE(INNOBASE_SHARE, table_name_hash,
			    innobase_open_tables, fold, share);

		/* Free any memory from index translation table */
		ut_free(share->idx_trans_tbl.index_mapping);

		my_free(share);

		/* TODO: invoke HASH_MIGRATE if innobase_open_tables
		shrinks too much */
	}

	mysql_mutex_unlock(&innobase_share_mutex);
}

/*********************************************************************//**
Returns number of THR_LOCK locks used for one instance of InnoDB table.
InnoDB no longer relies on THR_LOCK locks so 0 value is returned.
Instead of THR_LOCK locks InnoDB relies on combination of metadata locks
(e.g. for LOCK TABLES and DDL) and its own locking subsystem.
Note that even though this method returns 0, SQL-layer still calls
::store_lock(), ::start_stmt() and ::external_lock() methods for InnoDB
tables. */

uint
ha_innobase::lock_count(void) const
/*===============================*/
{
	return 0;
}

/*****************************************************************//**
Supposed to convert a MySQL table lock stored in the 'lock' field of the
handle to a proper type before storing pointer to the lock into an array
of pointers.
In practice, since InnoDB no longer relies on THR_LOCK locks and its
lock_count() method returns 0 it just informs storage engine about type
of THR_LOCK which SQL-layer would have acquired for this specific statement
on this specific table.
MySQL also calls this if it wants to reset some table locks to a not-locked
state during the processing of an SQL query. An example is that during a
SELECT the read lock is released early on the 'const' tables where we only
fetch one row. MySQL does not call this when it releases all locks at the
end of an SQL statement.
@return pointer to the current element in the 'to' array. */

THR_LOCK_DATA**
ha_innobase::store_lock(
/*====================*/
	THD*			thd,		/*!< in: user thread handle */
	THR_LOCK_DATA**		to,		/*!< in: pointer to the current
						element in an array of pointers
						to lock structs;
						only used as return value */
	thr_lock_type		lock_type)	/*!< in: lock type to store in
						'lock'; this may also be
						TL_IGNORE */
{
	/* Note that trx in this function is NOT necessarily m_prebuilt->trx
	because we call update_thd() later, in ::external_lock()! Failure to
	understand this caused a serious memory corruption bug in 5.1.11. */

	trx_t*	trx = check_trx_exists(thd);

	TrxInInnoDB	trx_in_innodb(trx);

	/* NOTE: MySQL can call this function with lock 'type' TL_IGNORE!
	Be careful to ignore TL_IGNORE if we are going to do something with
	only 'real' locks! */

	/* If no MySQL table is in use, we need to set the isolation level
	of the transaction. */

	if (lock_type != TL_IGNORE
	    && trx->n_mysql_tables_in_use == 0) {
		trx->isolation_level = innobase_map_isolation_level(
			(enum_tx_isolation) thd_tx_isolation(thd));

		if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
		    && MVCC::is_view_active(trx->read_view)) {

			/* At low transaction isolation levels we let
			each consistent read set its own snapshot */

			mutex_enter(&trx_sys->mutex);

			trx_sys->mvcc->view_close(trx->read_view, true);

			mutex_exit(&trx_sys->mutex);
		}
	}

	DBUG_ASSERT(EQ_CURRENT_THD(thd));
	const bool in_lock_tables = thd_in_lock_tables(thd);
	const uint sql_command = thd_sql_command(thd);

	if (srv_read_only_mode
	    && !dict_table_is_intrinsic(m_prebuilt->table)
	    && (sql_command == SQLCOM_UPDATE
		|| sql_command == SQLCOM_INSERT
		|| sql_command == SQLCOM_REPLACE
		|| sql_command == SQLCOM_DROP_TABLE
		|| sql_command == SQLCOM_ALTER_TABLE
		|| sql_command == SQLCOM_OPTIMIZE
		|| (sql_command == SQLCOM_CREATE_TABLE
		    && (lock_type >= TL_WRITE_CONCURRENT_INSERT
			 && lock_type <= TL_WRITE))
		|| sql_command == SQLCOM_CREATE_INDEX
		|| sql_command == SQLCOM_DROP_INDEX
		|| sql_command == SQLCOM_DELETE)) {

		ib_senderrf(trx->mysql_thd,
			    IB_LOG_LEVEL_WARN, ER_READ_ONLY_MODE);

	} else if (sql_command == SQLCOM_FLUSH
		   && lock_type == TL_READ_NO_INSERT) {

		/* Check for FLUSH TABLES ... WITH READ LOCK */

		/* Note: This call can fail, but there is no way to return
		the error to the caller. We simply ignore it for now here
		and push the error code to the caller where the error is
		detected in the function. */

		dberr_t	err = row_quiesce_set_state(
			m_prebuilt->table, QUIESCE_START, trx);

		ut_a(err == DB_SUCCESS || err == DB_UNSUPPORTED);

		if (trx->isolation_level == TRX_ISO_SERIALIZABLE) {
			m_prebuilt->select_lock_type = LOCK_S;
			m_prebuilt->stored_select_lock_type = LOCK_S;
		} else {
			m_prebuilt->select_lock_type = LOCK_NONE;
			m_prebuilt->stored_select_lock_type = LOCK_NONE;
		}

	/* Check for DROP TABLE */
	} else if (sql_command == SQLCOM_DROP_TABLE) {

		/* MySQL calls this function in DROP TABLE though this table
		handle may belong to another thd that is running a query. Let
		us in that case skip any changes to the m_prebuilt struct. */

	/* Check for LOCK TABLE t1,...,tn WITH SHARED LOCKS */
	} else if ((lock_type == TL_READ && in_lock_tables)
		   || (lock_type == TL_READ_HIGH_PRIORITY && in_lock_tables)
		   || lock_type == TL_READ_WITH_SHARED_LOCKS
		   || lock_type == TL_READ_NO_INSERT
		   || (lock_type != TL_IGNORE
		       && sql_command != SQLCOM_SELECT)) {

		/* The OR cases above are in this order:
		1) MySQL is doing LOCK TABLES ... READ LOCAL, or we
		are processing a stored procedure or function, or
		2) (we do not know when TL_READ_HIGH_PRIORITY is used), or
		3) this is a SELECT ... IN SHARE MODE, or
		4) we are doing a complex SQL statement like
		INSERT INTO ... SELECT ... and the logical logging (MySQL
		binlog) requires the use of a locking read, or
		MySQL is doing LOCK TABLES ... READ.
		5) we let InnoDB do locking reads for all SQL statements that
		are not simple SELECTs; note that select_lock_type in this
		case may get strengthened in ::external_lock() to LOCK_X.
		Note that we MUST use a locking read in all data modifying
		SQL statements, because otherwise the execution would not be
		serializable, and also the results from the update could be
		unexpected if an obsolete consistent read view would be
		used. */

		/* Use consistent read for checksum table */

		if (sql_command == SQLCOM_CHECKSUM
		    || ((srv_locks_unsafe_for_binlog
			|| trx->isolation_level <= TRX_ISO_READ_COMMITTED)
			&& trx->isolation_level != TRX_ISO_SERIALIZABLE
			&& (lock_type == TL_READ
			    || lock_type == TL_READ_NO_INSERT)
			&& (sql_command == SQLCOM_INSERT_SELECT
			    || sql_command == SQLCOM_REPLACE_SELECT
			    || sql_command == SQLCOM_UPDATE
			    || sql_command == SQLCOM_CREATE_TABLE))) {

			/* If we either have innobase_locks_unsafe_for_binlog
			option set or this session is using READ COMMITTED
			isolation level and isolation level of the transaction
			is not set to serializable and MySQL is doing
			INSERT INTO...SELECT or REPLACE INTO...SELECT
			or UPDATE ... = (SELECT ...) or CREATE  ...
			SELECT... without FOR UPDATE or IN SHARE
			MODE in select, then we use consistent read
			for select. */

			m_prebuilt->select_lock_type = LOCK_NONE;
			m_prebuilt->stored_select_lock_type = LOCK_NONE;
		} else {
			m_prebuilt->select_lock_type = LOCK_S;
			m_prebuilt->stored_select_lock_type = LOCK_S;
		}

	} else if (lock_type != TL_IGNORE) {

		/* We set possible LOCK_X value in external_lock, not yet
		here even if this would be SELECT ... FOR UPDATE */

		m_prebuilt->select_lock_type = LOCK_NONE;
		m_prebuilt->stored_select_lock_type = LOCK_NONE;
	}

	if (!trx_is_started(trx)
	    && (m_prebuilt->select_lock_type != LOCK_NONE
	        || m_prebuilt->stored_select_lock_type != LOCK_NONE)) {

		++trx->will_lock;
	}

#ifdef UNIV_DEBUG
	if(trx->is_dd_trx) {
		ut_ad(trx->will_lock == 0
		      && m_prebuilt->select_lock_type == LOCK_NONE);
	}
#endif /* UNIV_DEBUG */

	return(to);
}

/*********************************************************************//**
Read the next autoinc value. Acquire the relevant locks before reading
the AUTOINC value. If SUCCESS then the table AUTOINC mutex will be locked
on return and all relevant locks acquired.
@return DB_SUCCESS or error code */

dberr_t
ha_innobase::innobase_get_autoinc(
/*==============================*/
	ulonglong*	value)		/*!< out: autoinc value */
{
	*value = 0;

	m_prebuilt->autoinc_error = innobase_lock_autoinc();

	if (m_prebuilt->autoinc_error == DB_SUCCESS) {

		/* Determine the first value of the interval */
		*value = dict_table_autoinc_read(m_prebuilt->table);

		/* It should have been initialized during open. */
		if (*value == 0) {
			m_prebuilt->autoinc_error = DB_UNSUPPORTED;
			dict_table_autoinc_unlock(m_prebuilt->table);
		}
	}

	return(m_prebuilt->autoinc_error);
}

/*******************************************************************//**
This function reads the global auto-inc counter. It doesn't use the
AUTOINC lock even if the lock mode is set to TRADITIONAL.
@return the autoinc value */

ulonglong
ha_innobase::innobase_peek_autoinc(void)
/*====================================*/
{
	ulonglong	auto_inc;
	dict_table_t*	innodb_table;

	ut_a(m_prebuilt != NULL);
	ut_a(m_prebuilt->table != NULL);

	innodb_table = m_prebuilt->table;

	dict_table_autoinc_lock(innodb_table);

	auto_inc = dict_table_autoinc_read(innodb_table);

	if (auto_inc == 0) {
		ib::info() << "AUTOINC next value generation is disabled for"
			" '" << innodb_table->name << "'";
	}

	dict_table_autoinc_unlock(innodb_table);

	return(auto_inc);
}

/*********************************************************************//**
Returns the value of the auto-inc counter in *first_value and ~0 on failure. */

void
ha_innobase::get_auto_increment(
/*============================*/
	ulonglong	offset,			/*!< in: table autoinc offset */
	ulonglong	increment,		/*!< in: table autoinc
						increment */
	ulonglong	nb_desired_values,	/*!< in: number of values
						reqd */
	ulonglong*	first_value,		/*!< out: the autoinc value */
	ulonglong*	nb_reserved_values)	/*!< out: count of reserved
						values */
{
	trx_t*		trx;
	dberr_t		error;
	ulonglong	autoinc = 0;

	/* Prepare m_prebuilt->trx in the table handle */
	update_thd(ha_thd());

	error = innobase_get_autoinc(&autoinc);

	if (error != DB_SUCCESS) {
		*first_value = (~(ulonglong) 0);
		return;
	}

	/* This is a hack, since nb_desired_values seems to be accurate only
	for the first call to get_auto_increment() for multi-row INSERT and
	meaningless for other statements e.g, LOAD etc. Subsequent calls to
	this method for the same statement results in different values which
	don't make sense. Therefore we store the value the first time we are
	called and count down from that as rows are written (see write_row()).
	*/

	trx = m_prebuilt->trx;

	TrxInInnoDB	trx_in_innodb(trx);

	/* Note: We can't rely on *first_value since some MySQL engines,
	in particular the partition engine, don't initialize it to 0 when
	invoking this method. So we are not sure if it's guaranteed to
	be 0 or not. */

	/* We need the upper limit of the col type to check for
	whether we update the table autoinc counter or not. */
	ulonglong	col_max_value =
		table->next_number_field->get_max_int_value();

	/* Called for the first time ? */
	if (trx->n_autoinc_rows == 0) {

		trx->n_autoinc_rows = (ulint) nb_desired_values;

		/* It's possible for nb_desired_values to be 0:
		e.g., INSERT INTO T1(C) SELECT C FROM T2; */
		if (nb_desired_values == 0) {

			trx->n_autoinc_rows = 1;
		}

		set_if_bigger(*first_value, autoinc);
	/* Not in the middle of a mult-row INSERT. */
	} else if (m_prebuilt->autoinc_last_value == 0) {
		set_if_bigger(*first_value, autoinc);
	/* Check for -ve values. */
	} else if (*first_value > col_max_value && trx->n_autoinc_rows > 0) {
		/* Set to next logical value. */
		ut_a(autoinc > trx->n_autoinc_rows);
		*first_value = (autoinc - trx->n_autoinc_rows) - 1;
	}

	*nb_reserved_values = trx->n_autoinc_rows;

	/* With old style AUTOINC locking we only update the table's
	AUTOINC counter after attempting to insert the row. */
	if (innobase_autoinc_lock_mode != AUTOINC_OLD_STYLE_LOCKING) {
		ulonglong	current;
		ulonglong	next_value;

		current = *first_value > col_max_value ? autoinc : *first_value;

		/* If the increment step of the auto increment column
		decreases then it is not affecting the immediate
		next value in the series. */
		if (m_prebuilt->autoinc_increment > increment) {

			current = autoinc - m_prebuilt->autoinc_increment;

			current = innobase_next_autoinc(
				current, 1, increment, 1, col_max_value);

			dict_table_autoinc_initialize(
				m_prebuilt->table, current);

			*first_value = current;
		}

		/* Compute the last value in the interval */
		next_value = innobase_next_autoinc(
			current, *nb_reserved_values, increment, offset,
			col_max_value);

		m_prebuilt->autoinc_last_value = next_value;

		if (m_prebuilt->autoinc_last_value < *first_value) {
			*first_value = (~(ulonglong) 0);
		} else {
			/* Update the table autoinc variable */
			dict_table_autoinc_update_if_greater(
				m_prebuilt->table,
				m_prebuilt->autoinc_last_value);
		}
	} else {
		/* This will force write_row() into attempting an update
		of the table's AUTOINC counter. */
		m_prebuilt->autoinc_last_value = 0;
	}

	/* The increment to be used to increase the AUTOINC value, we use
	this in write_row() and update_row() to increase the autoinc counter
	for columns that are filled by the user. We need the offset and
	the increment. */
	m_prebuilt->autoinc_offset = offset;
	m_prebuilt->autoinc_increment = increment;

	dict_table_autoinc_unlock(m_prebuilt->table);
}

/*******************************************************************//**
See comment in handler.cc */

bool
ha_innobase::get_error_message(
/*===========================*/
	int	error,
	String*	buf)
{
	trx_t*	trx = check_trx_exists(ha_thd());

	buf->copy(trx->detailed_error, (uint) strlen(trx->detailed_error),
		system_charset_info);

	return(FALSE);
}

/** Retrieves the names of the table and the key for which there was a
duplicate entry in the case of HA_ERR_FOREIGN_DUPLICATE_KEY.

If any of the names is not available, then this method will return
false and will not change any of child_table_name or child_key_name.

@param[out] child_table_name Table name
@param[in] child_table_name_len Table name buffer size
@param[out] child_key_name Key name
@param[in] child_key_name_len Key name buffer size

@retval true table and key names were available and were written into the
corresponding out parameters.
@retval false table and key names were not available, the out parameters
were not touched. */
bool
ha_innobase::get_foreign_dup_key(
/*=============================*/
	char*	child_table_name,
	uint	child_table_name_len,
	char*	child_key_name,
	uint	child_key_name_len)
{
	const dict_index_t*	err_index;

	ut_a(m_prebuilt->trx != NULL);
	ut_a(m_prebuilt->trx->magic_n == TRX_MAGIC_N);

	err_index = trx_get_error_info(m_prebuilt->trx);

	if (err_index == NULL) {
		return(false);
	}
	/* else */

	/* copy table name (and convert from filename-safe encoding to
	system_charset_info) */
	char*	p = strchr(err_index->table->name.m_name, '/');

	/* strip ".../" prefix if any */
	if (p != NULL) {
		p++;
	} else {
		p = err_index->table->name.m_name;
	}

	size_t	len;

	len = filename_to_tablename(p, child_table_name, child_table_name_len);

	child_table_name[len] = '\0';

	/* copy index name */
	ut_snprintf(child_key_name, child_key_name_len, "%s",
		    err_index->name());

	return(true);
}

/*******************************************************************//**
Compares two 'refs'. A 'ref' is the (internal) primary key value of the row.
If there is no explicitly declared non-null unique key or a primary key, then
InnoDB internally uses the row id as the primary key.
@return < 0 if ref1 < ref2, 0 if equal, else > 0 */

int
ha_innobase::cmp_ref(
/*=================*/
	const uchar*	ref1,	/*!< in: an (internal) primary key value in the
				MySQL key value format */
	const uchar*	ref2)	/*!< in: an (internal) primary key value in the
				MySQL key value format */
{
	enum_field_types mysql_type;
	Field*		field;
	KEY_PART_INFO*	key_part;
	KEY_PART_INFO*	key_part_end;
	uint		len1;
	uint		len2;
	int		result;

	if (m_prebuilt->clust_index_was_generated) {
		/* The 'ref' is an InnoDB row id */

		return(memcmp(ref1, ref2, DATA_ROW_ID_LEN));
	}

	/* Do a type-aware comparison of primary key fields. PK fields
	are always NOT NULL, so no checks for NULL are performed. */

	key_part = table->key_info[table->s->primary_key].key_part;

	key_part_end = key_part
		+ table->key_info[table->s->primary_key].user_defined_key_parts;

	for (; key_part != key_part_end; ++key_part) {
		field = key_part->field;
		mysql_type = field->type();

		if (mysql_type == MYSQL_TYPE_TINY_BLOB
			|| mysql_type == MYSQL_TYPE_MEDIUM_BLOB
			|| mysql_type == MYSQL_TYPE_BLOB
			|| mysql_type == MYSQL_TYPE_LONG_BLOB) {

			/* In the MySQL key value format, a column prefix of
			a BLOB is preceded by a 2-byte length field */

			len1 = innobase_read_from_2_little_endian(ref1);
			len2 = innobase_read_from_2_little_endian(ref2);

			result = ((Field_blob*) field)->cmp(
				ref1 + 2, len1, ref2 + 2, len2);
		} else {
			result = field->key_cmp(ref1, ref2);
		}

		if (result) {

			return(result);
		}

		ref1 += key_part->store_length;
		ref2 += key_part->store_length;
	}

	return(0);
}

/*******************************************************************//**
Ask InnoDB if a query to a table can be cached.
@return TRUE if query caching of the table is permitted */

my_bool
ha_innobase::register_query_cache_table(
/*====================================*/
	THD*		thd,		/*!< in: user thread handle */
	char*		table_key,	/*!< in: normalized path to the
					table */
	size_t		key_length,	/*!< in: length of the normalized
					path to the table */
	qc_engine_callback*
			call_back,	/*!< out: pointer to function for
					checking if query caching
					is permitted */
	ulonglong	*engine_data)	/*!< in/out: data to call_back */
{
	*engine_data = 0;

	*call_back = innobase_query_caching_of_table_permitted;

	return(innobase_query_caching_of_table_permitted(
			thd, table_key,
			static_cast<uint>(key_length),
			engine_data));
}

/******************************************************************//**
This function is used to find the storage length in bytes of the first n
characters for prefix indexes using a multibyte character set. The function
finds charset information and returns length of prefix_len characters in the
index field in bytes.
@return number of bytes occupied by the first n characters */
ulint
innobase_get_at_most_n_mbchars(
/*===========================*/
	ulint charset_id,	/*!< in: character set id */
	ulint prefix_len,	/*!< in: prefix length in bytes of the index
				(this has to be divided by mbmaxlen to get the
				number of CHARACTERS n in the prefix) */
	ulint data_len,		/*!< in: length of the string in bytes */
	const char* str)	/*!< in: character string */
{
	ulint char_length;	/*!< character length in bytes */
	ulint n_chars;		/*!< number of characters in prefix */
	CHARSET_INFO* charset;	/*!< charset used in the field */

	charset = get_charset((uint) charset_id, MYF(MY_WME));

	ut_ad(charset);
	ut_ad(charset->mbmaxlen);

	/* Calculate how many characters at most the prefix index contains */

	n_chars = prefix_len / charset->mbmaxlen;

	/* If the charset is multi-byte, then we must find the length of the
	first at most n chars in the string. If the string contains less
	characters than n, then we return the length to the end of the last
	character. */

	if (charset->mbmaxlen > 1) {
		/* my_charpos() returns the byte length of the first n_chars
		characters, or a value bigger than the length of str, if
		there were not enough full characters in str.

		Why does the code below work:
		Suppose that we are looking for n UTF-8 characters.

		1) If the string is long enough, then the prefix contains at
		least n complete UTF-8 characters + maybe some extra
		characters + an incomplete UTF-8 character. No problem in
		this case. The function returns the pointer to the
		end of the nth character.

		2) If the string is not long enough, then the string contains
		the complete value of a column, that is, only complete UTF-8
		characters, and we can store in the column prefix index the
		whole string. */

		char_length = my_charpos(charset, str,
						str + data_len, (int) n_chars);
		if (char_length > data_len) {
			char_length = data_len;
		}
	} else if (data_len < prefix_len) {

		char_length = data_len;

	} else {

		char_length = prefix_len;
	}

	return(char_length);
}

/*******************************************************************//**
This function is used to prepare an X/Open XA distributed transaction.
@return 0 or error number */
static
int
innobase_xa_prepare(
/*================*/
	handlerton*	hton,		/*!< in: InnoDB handlerton */
	THD*		thd,		/*!< in: handle to the MySQL thread of
					the user whose XA transaction should
					be prepared */
	bool		prepare_trx)	/*!< in: true - prepare transaction
					false - the current SQL statement
					ended */
{
	trx_t*		trx = check_trx_exists(thd);

	DBUG_ASSERT(hton == innodb_hton_ptr);

	thd_get_xid(thd, (MYSQL_XID*) trx->xid);

	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the trx_sys->mutex, we have to release the search system
	latch first to obey the latching order. */

	trx_search_latch_release_if_reserved(trx);

	innobase_srv_conc_force_exit_innodb(trx);

	TrxInInnoDB	trx_in_innodb(trx);

	if (trx_in_innodb.is_aborted()) {

		return(innobase_rollback(hton, thd, prepare_trx));
	}

	if (!trx_is_registered_for_2pc(trx) && trx_is_started(trx)) {

		sql_print_error("Transaction not registered for MySQL 2PC,"
				" but transaction is active");
	}

	if (prepare_trx
	    || (!thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {

		/* We were instructed to prepare the whole transaction, or
		this is an SQL statement end and autocommit is on */

		ut_ad(trx_is_registered_for_2pc(trx));

		dberr_t	err = trx_prepare_for_mysql(trx);

		ut_ad(err == DB_SUCCESS || err == DB_FORCED_ABORT);

		if (err == DB_FORCED_ABORT) {
			return(innobase_rollback(hton, thd, prepare_trx));
		}

		DBUG_EXECUTE_IF("crash_innodb_after_prepare",
				DBUG_SUICIDE(););

	} else {
		/* We just mark the SQL statement ended and do not do a
		transaction prepare */

		/* If we had reserved the auto-inc lock for some
		table in this SQL statement we release it now */

		lock_unlock_table_autoinc(trx);

		/* Store the current undo_no of the transaction so that we
		know where to roll back if we have to roll back the next
		SQL statement */

		trx_mark_sql_stat_end(trx);
	}

	if (thd_sql_command(thd) != SQLCOM_XA_PREPARE
	    && (prepare_trx
		|| !thd_test_options(
			thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {

		/* For mysqlbackup to work the order of transactions in binlog
		and InnoDB must be the same. Consider the situation

		  thread1> prepare; write to binlog; ...
			  <context switch>
		  thread2> prepare; write to binlog; commit
		  thread1>			     ... commit

                The server guarantees that writes to the binary log
                and commits are in the same order, so we do not have
                to handle this case. */
	}

	return(0);
}

/*******************************************************************//**
This function is used to recover X/Open XA distributed transactions.
@return number of prepared transactions stored in xid_list */
static
int
innobase_xa_recover(
/*================*/
	handlerton*	hton,	/*!< in: InnoDB handlerton */
	XID*		xid_list,/*!< in/out: prepared transactions */
	uint		len)	/*!< in: number of slots in xid_list */
{
	DBUG_ASSERT(hton == innodb_hton_ptr);

	if (len == 0 || xid_list == NULL) {

		return(0);
	}

	return(trx_recover_for_mysql(xid_list, len));
}

/*******************************************************************//**
This function is used to commit one X/Open XA distributed transaction
which is in the prepared state
@return 0 or error number */
static
int
innobase_commit_by_xid(
/*===================*/
	handlerton*	hton,
	XID*		xid)	/*!< in: X/Open XA transaction identification */
{
	DBUG_ASSERT(hton == innodb_hton_ptr);

	trx_t*	trx = trx_get_trx_by_xid(xid);

	if (trx != NULL) {
		TrxInInnoDB	trx_in_innodb(trx);

		innobase_commit_low(trx);
                ut_ad(trx->mysql_thd == NULL);
		/* use cases are: disconnected xa, slave xa, recovery */
		trx_deregister_from_2pc(trx);
		ut_ad(!trx->will_lock);    /* trx cache requirement */
		trx_free_for_background(trx);

		return(XA_OK);
	} else {
		return(XAER_NOTA);
	}
}

/*******************************************************************//**
This function is used to rollback one X/Open XA distributed transaction
which is in the prepared state
@return 0 or error number */
static
int
innobase_rollback_by_xid(
/*=====================*/
	handlerton*	hton,	/*!< in: InnoDB handlerton */
	XID*		xid)	/*!< in: X/Open XA transaction
				identification */
{
	DBUG_ASSERT(hton == innodb_hton_ptr);

	trx_t*	trx = trx_get_trx_by_xid(xid);

	if (trx != NULL) {
		TrxInInnoDB	trx_in_innodb(trx);

		int	ret = innobase_rollback_trx(trx);

		trx_deregister_from_2pc(trx);
		ut_ad(!trx->will_lock);
		trx_free_for_background(trx);

		return(ret);
	} else {
		return(XAER_NOTA);
	}
}

/*******************************************************************//**
*/

bool
ha_innobase::check_if_incompatible_data(
/*====================================*/
	HA_CREATE_INFO*	info,
	uint		table_changes)
{
	innobase_copy_frm_flags_from_create_info(m_prebuilt->table, info);

	if (table_changes != IS_EQUAL_YES) {

		return(COMPATIBLE_DATA_NO);
	}

	/* Check that auto_increment value was not changed */
	if ((info->used_fields & HA_CREATE_USED_AUTO)
	    && info->auto_increment_value != 0) {

		return(COMPATIBLE_DATA_NO);
	}

	/* Check that row format didn't change */
	if ((info->used_fields & HA_CREATE_USED_ROW_FORMAT)
	    && info->row_type != get_row_type()) {

		return(COMPATIBLE_DATA_NO);
	}

	/* Specifying KEY_BLOCK_SIZE requests a rebuild of the table. */
	if (info->used_fields & HA_CREATE_USED_KEY_BLOCK_SIZE) {
		return(COMPATIBLE_DATA_NO);
	}

	return(COMPATIBLE_DATA_YES);
}

/****************************************************************//**
Update the system variable innodb_io_capacity_max using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_io_capacity_max_update(
/*===========================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	ulong	in_val = *static_cast<const ulong*>(save);

	if (in_val < srv_io_capacity) {
		in_val = srv_io_capacity;
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "innodb_io_capacity_max cannot be"
				    " set lower than innodb_io_capacity.");
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "Setting innodb_io_capacity_max to %lu",
				    srv_io_capacity);
	}

	srv_max_io_capacity = in_val;
}

/****************************************************************//**
Update the system variable innodb_io_capacity using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_io_capacity_update(
/*======================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	ulong	in_val = *static_cast<const ulong*>(save);
	if (in_val > srv_max_io_capacity) {
		in_val = srv_max_io_capacity;
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "innodb_io_capacity cannot be set"
				    " higher than innodb_io_capacity_max.");
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "Setting innodb_io_capacity to %lu",
				    srv_max_io_capacity);
	}

	srv_io_capacity = in_val;
}

/****************************************************************//**
Update the system variable innodb_max_dirty_pages_pct using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_max_dirty_pages_pct_update(
/*==============================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	double	in_val = *static_cast<const double*>(save);
	if (in_val < srv_max_dirty_pages_pct_lwm) {
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "innodb_max_dirty_pages_pct cannot be"
				    " set lower than"
				    " innodb_max_dirty_pages_pct_lwm.");
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "Lowering"
				    " innodb_max_dirty_page_pct_lwm to %lf",
				    in_val);

		srv_max_dirty_pages_pct_lwm = in_val;
	}

	srv_max_buf_pool_modified_pct = in_val;
}

/****************************************************************//**
Update the system variable innodb_max_dirty_pages_pct_lwm using the
"saved" value. This function is registered as a callback with MySQL. */
static
void
innodb_max_dirty_pages_pct_lwm_update(
/*==================================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	double	in_val = *static_cast<const double*>(save);
	if (in_val > srv_max_buf_pool_modified_pct) {
		in_val = srv_max_buf_pool_modified_pct;
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "innodb_max_dirty_pages_pct_lwm"
				    " cannot be set higher than"
				    " innodb_max_dirty_pages_pct.");
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "Setting innodb_max_dirty_page_pct_lwm"
				    " to %lf",
				    in_val);
	}

	srv_max_dirty_pages_pct_lwm = in_val;
}

/************************************************************//**
Validate the file format name and return its corresponding id.
@return valid file format id */
static
uint
innobase_file_format_name_lookup(
/*=============================*/
	const char*	format_name)	/*!< in: pointer to file format name */
{
	char*	endp;
	uint	format_id;

	ut_a(format_name != NULL);

	/* The format name can contain the format id itself instead of
	the name and we check for that. */
	format_id = (uint) strtoul(format_name, &endp, 10);

	/* Check for valid parse. */
	if (*endp == '\0' && *format_name != '\0') {

		if (format_id <= UNIV_FORMAT_MAX) {

			return(format_id);
		}
	} else {

		for (format_id = 0; format_id <= UNIV_FORMAT_MAX;
		     format_id++) {
			const char*	name;

			name = trx_sys_file_format_id_to_name(format_id);

			if (!innobase_strcasecmp(format_name, name)) {

				return(format_id);
			}
		}
	}

	return(UNIV_FORMAT_MAX + 1);
}

/************************************************************//**
Validate the file format check config parameters, as a side effect it
sets the srv_max_file_format_at_startup variable.
@return the format_id if valid config value, otherwise, return -1 */
static
int
innobase_file_format_validate_and_set(
/*==================================*/
	const char*	format_max)	/*!< in: parameter value */
{
	uint		format_id;

	format_id = innobase_file_format_name_lookup(format_max);

	if (format_id < UNIV_FORMAT_MAX + 1) {
		srv_max_file_format_at_startup = format_id;

		return((int) format_id);
	} else {
		return(-1);
	}
}

/*************************************************************//**
Check if it is a valid file format. This function is registered as
a callback with MySQL.
@return 0 for valid file format */
static
int
innodb_file_format_name_validate(
/*=============================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming string */
{
	const char*	file_format_input;
	char		buff[STRING_BUFFER_USUAL_SIZE];
	int		len = sizeof(buff);

	ut_a(save != NULL);
	ut_a(value != NULL);

	file_format_input = value->val_str(value, buff, &len);

	if (file_format_input != NULL) {
		uint	format_id;

		format_id = innobase_file_format_name_lookup(
			file_format_input);

		if (format_id <= UNIV_FORMAT_MAX) {

			/* Save a pointer to the name in the
			'file_format_name_map' constant array. */
			*static_cast<const char**>(save) =
			    trx_sys_file_format_id_to_name(format_id);

			return(0);
		}
	}

	*static_cast<const char**>(save) = NULL;
	return(1);
}

/****************************************************************//**
Update the system variable innodb_file_format using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_file_format_name_update(
/*===========================*/
	THD*				thd,		/*!< in: thread handle */
	struct st_mysql_sys_var*	var,		/*!< in: pointer to
							system variable */
	void*				var_ptr,	/*!< out: where the
							formal string goes */
	const void*			save)		/*!< in: immediate result
							from check function */
{
	const char* format_name;

	ut_a(var_ptr != NULL);
	ut_a(save != NULL);

	push_warning(thd, Sql_condition::SL_WARNING,
		     HA_ERR_WRONG_COMMAND, deprecated_file_format);

	format_name = *static_cast<const char*const*>(save);

	if (format_name) {
		uint	format_id;

		format_id = innobase_file_format_name_lookup(format_name);

		if (format_id <= UNIV_FORMAT_MAX) {
			srv_file_format = format_id;
		}
	}

	*static_cast<const char**>(var_ptr)
		= trx_sys_file_format_id_to_name(srv_file_format);
}

/*************************************************************//**
Check if valid argument to innodb_file_format_max. This function
is registered as a callback with MySQL.
@return 0 for valid file format */
static
int
innodb_file_format_max_validate(
/*============================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming string */
{
	const char*	file_format_input;
	char		buff[STRING_BUFFER_USUAL_SIZE];
	int		len = sizeof(buff);
	int		format_id;

	ut_a(save != NULL);
	ut_a(value != NULL);

	file_format_input = value->val_str(value, buff, &len);

	if (file_format_input != NULL) {

		format_id = innobase_file_format_validate_and_set(
			file_format_input);

		if (format_id >= 0) {
			/* Save a pointer to the name in the
			'file_format_name_map' constant array. */
			*static_cast<const char**>(save) =
			    trx_sys_file_format_id_to_name(
						(uint) format_id);

			return(0);

		} else {
			push_warning_printf(thd,
			  Sql_condition::SL_WARNING,
			  ER_WRONG_ARGUMENTS,
			  "InnoDB: invalid innodb_file_format_max"
			  " value; can be any format up to %s"
			  " or equivalent id of %d",
			  trx_sys_file_format_id_to_name(UNIV_FORMAT_MAX),
			  UNIV_FORMAT_MAX);
		}
	}

	*static_cast<const char**>(save) = NULL;
	return(1);
}

/****************************************************************//**
Update the system variable innodb_file_format_max using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_file_format_max_update(
/*==========================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	const char*	format_name_in;
	const char**	format_name_out;
	uint		format_id;

	ut_a(save != NULL);
	ut_a(var_ptr != NULL);

	push_warning(thd, Sql_condition::SL_WARNING,
		     HA_ERR_WRONG_COMMAND, deprecated_file_format_max);

	format_name_in = *static_cast<const char*const*>(save);

	if (!format_name_in) {

		return;
	}

	format_id = innobase_file_format_name_lookup(format_name_in);

	if (format_id > UNIV_FORMAT_MAX) {
		/* DEFAULT is "on", which is invalid at runtime. */
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "Ignoring SET innodb_file_format=%s",
				    format_name_in);
		return;
	}

	format_name_out = static_cast<const char**>(var_ptr);

	/* Update the max format id in the system tablespace. */
	if (trx_sys_file_format_max_set(format_id, format_name_out)) {
		ib::info() << "The file format in the system tablespace is now"
			" set to " << *format_name_out << ".";
	}
}

/** Update innodb_large_prefix.
@param[in,out]	thd	MySQL client connection
@param[out]	var_ptr	current value
@param[in]	save	to-be-assigned value */
static
void
innodb_large_prefix_update(
	THD*		thd,
	st_mysql_sys_var*,
	void*		var_ptr,
	const void*	save)
{
	push_warning(thd, Sql_condition::SL_WARNING,
		     HA_ERR_WRONG_COMMAND, deprecated_large_prefix);

	*static_cast<my_bool*>(var_ptr) = *static_cast<const my_bool*>(save);
}

/*************************************************************//**
Check whether valid argument given to innobase_*_stopword_table.
This function is registered as a callback with MySQL.
@return 0 for valid stopword table */
static
int
innodb_stopword_table_validate(
/*===========================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming string */
{
	const char*	stopword_table_name;
	char		buff[STRING_BUFFER_USUAL_SIZE];
	int		len = sizeof(buff);
	trx_t*		trx;
	int		ret = 1;

	ut_a(save != NULL);
	ut_a(value != NULL);

	stopword_table_name = value->val_str(value, buff, &len);

	trx = check_trx_exists(thd);

	row_mysql_lock_data_dictionary(trx);

	/* Validate the stopword table's (if supplied) existence and
	of the right format */
	if (!stopword_table_name
	    || fts_valid_stopword_table(stopword_table_name)) {
		*static_cast<const char**>(save) = stopword_table_name;
		ret = 0;
	}

	row_mysql_unlock_data_dictionary(trx);

	return(ret);
}

/** Update the system variable innodb_buffer_pool_size using the "saved"
value. This function is registered as a callback with MySQL.
@param[in]	thd	thread handle
@param[in]	var	pointer to system variable
@param[out]	var_ptr	where the formal string goes
@param[in]	save	immediate result from check function */
static
void
innodb_buffer_pool_size_update(
	THD*				thd,
	struct st_mysql_sys_var*	var,
	void*				var_ptr,
	const void*			save)
{
        longlong	in_val = *static_cast<const longlong*>(save);

	ut_snprintf(export_vars.innodb_buffer_pool_resize_status,
	        sizeof(export_vars.innodb_buffer_pool_resize_status),
		"Requested to resize buffer pool.");

	os_event_set(srv_buf_resize_event);

	ib::info() << export_vars.innodb_buffer_pool_resize_status
		<< " (new size: " << in_val << " bytes)";
}

/*************************************************************//**
Check whether valid argument given to "innodb_fts_internal_tbl_name"
This function is registered as a callback with MySQL.
@return 0 for valid stopword table */
static
int
innodb_internal_table_validate(
/*===========================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming string */
{
	const char*	table_name;
	char		buff[STRING_BUFFER_USUAL_SIZE];
	int		len = sizeof(buff);
	int		ret = 1;
	dict_table_t*	user_table;

	ut_a(save != NULL);
	ut_a(value != NULL);

	table_name = value->val_str(value, buff, &len);

	if (!table_name) {
		*static_cast<const char**>(save) = NULL;
		return(0);
	}

	user_table = dict_table_open_on_name(
		table_name, FALSE, TRUE, DICT_ERR_IGNORE_NONE);

	if (user_table) {
		if (dict_table_has_fts_index(user_table)) {
			*static_cast<const char**>(save) = table_name;
			ret = 0;
		}

		dict_table_close(user_table, FALSE, TRUE);

		DBUG_EXECUTE_IF("innodb_evict_autoinc_table",
			mutex_enter(&dict_sys->mutex);
			dict_table_remove_from_cache_low(user_table, TRUE);
			mutex_exit(&dict_sys->mutex);
		);
	}

	return(ret);
}

/****************************************************************//**
Update the system variable innodb_adaptive_hash_index using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_adaptive_hash_index_update(
/*==============================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	if (*(my_bool*) save) {
		btr_search_enable();
	} else {
		btr_search_disable(true);
	}
}

/****************************************************************//**
Update the system variable innodb_cmp_per_index using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_cmp_per_index_update(
/*========================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	/* Reset the stats whenever we enable the table
	INFORMATION_SCHEMA.innodb_cmp_per_index. */
	if (!srv_cmp_per_index_enabled && *(my_bool*) save) {
		page_zip_reset_stat_per_index();
	}

	srv_cmp_per_index_enabled = !!(*(my_bool*) save);
}

/****************************************************************//**
Update the system variable innodb_old_blocks_pct using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_old_blocks_pct_update(
/*=========================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	innobase_old_blocks_pct = static_cast<uint>(
		buf_LRU_old_ratio_update(
			*static_cast<const uint*>(save), TRUE));
}

/****************************************************************//**
Update the system variable innodb_old_blocks_pct using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_change_buffer_max_size_update(
/*=================================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	srv_change_buffer_max_size =
			(*static_cast<const uint*>(save));
	ibuf_max_size_update(srv_change_buffer_max_size);
}

#ifdef UNIV_DEBUG
ulong srv_fil_make_page_dirty_debug = 0;
ulong srv_saved_page_number_debug = 0;

/****************************************************************//**
Save an InnoDB page number. */
static
void
innodb_save_page_no(
/*================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	srv_saved_page_number_debug = *static_cast<const ulong*>(save);

	ib::info() << "Saving InnoDB page number: "
		<< srv_saved_page_number_debug;
}

/****************************************************************//**
Make the first page of given user tablespace dirty. */
static
void
innodb_make_page_dirty(
/*===================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	mtr_t		mtr;
	ulong		space_id = *static_cast<const ulong*>(save);
	fil_space_t*	space = fil_space_acquire_silent(space_id);

	if (space == NULL) {
		return;
	}

	if (srv_saved_page_number_debug > space->size) {
		fil_space_release(space);
		return;
	}

	mtr.start();
	mtr.set_named_space(space);

	buf_block_t*	block = buf_page_get(
		page_id_t(space_id, srv_saved_page_number_debug),
		page_size_t(space->flags), RW_X_LATCH, &mtr);

	if (block != NULL) {
		byte*	page = block->frame;

		ib::info() << "Dirtying page: " << page_id_t(
			page_get_space_id(page), page_get_page_no(page));

		mlog_write_ulint(page + FIL_PAGE_TYPE,
				 fil_page_get_type(page),
				 MLOG_2BYTES, &mtr);
	}
	mtr.commit();
	fil_space_release(space);
}
#endif // UNIV_DEBUG
/*************************************************************//**
Find the corresponding ibuf_use_t value that indexes into
innobase_change_buffering_values[] array for the input
change buffering option name.
@return corresponding IBUF_USE_* value for the input variable
name, or IBUF_USE_COUNT if not able to find a match */
static
ibuf_use_t
innodb_find_change_buffering_value(
/*===============================*/
	const char*	input_name)	/*!< in: input change buffering
					option name */
{
	for (ulint i = 0;
	     i < UT_ARR_SIZE(innobase_change_buffering_values);
	     ++i) {

		/* found a match */
		if (!innobase_strcasecmp(
			input_name, innobase_change_buffering_values[i])) {
			return(static_cast<ibuf_use_t>(i));
		}
	}

	/* Did not find any match */
	return(IBUF_USE_COUNT);
}

/*************************************************************//**
Check if it is a valid value of innodb_change_buffering. This function is
registered as a callback with MySQL.
@return 0 for valid innodb_change_buffering */
static
int
innodb_change_buffering_validate(
/*=============================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming string */
{
	const char*	change_buffering_input;
	char		buff[STRING_BUFFER_USUAL_SIZE];
	int		len = sizeof(buff);

	ut_a(save != NULL);
	ut_a(value != NULL);

	change_buffering_input = value->val_str(value, buff, &len);

	if (change_buffering_input != NULL) {
		ibuf_use_t	use;

		use = innodb_find_change_buffering_value(
			change_buffering_input);

		if (use != IBUF_USE_COUNT) {
			/* Find a matching change_buffering option value. */
			*static_cast<const char**>(save) =
				innobase_change_buffering_values[use];

			return(0);
		}
	}

	/* No corresponding change buffering option for user supplied
	"change_buffering_input" */
	return(1);
}

/****************************************************************//**
Update the system variable innodb_change_buffering using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_change_buffering_update(
/*===========================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	ibuf_use_t	use;

	ut_a(var_ptr != NULL);
	ut_a(save != NULL);

	use = innodb_find_change_buffering_value(
		*static_cast<const char*const*>(save));

	ut_a(use < IBUF_USE_COUNT);

	ibuf_use = use;
	*static_cast<const char**>(var_ptr) =
		 *static_cast<const char*const*>(save);
}

/*************************************************************//**
Just emit a warning that the usage of the variable is deprecated.
@return 0 */
static
void
innodb_stats_sample_pages_update(
/*=============================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{

	const char*	STATS_SAMPLE_PAGES_DEPRECATED_MSG =
		"Using innodb_stats_sample_pages is deprecated and"
		" the variable may be removed in future releases."
		" Please use innodb_stats_transient_sample_pages instead.";

	push_warning(thd, Sql_condition::SL_WARNING,
		     HA_ERR_WRONG_COMMAND, STATS_SAMPLE_PAGES_DEPRECATED_MSG);

	ib::warn() << STATS_SAMPLE_PAGES_DEPRECATED_MSG;

	srv_stats_transient_sample_pages =
		*static_cast<const unsigned long long*>(save);
}

/****************************************************************//**
Update the monitor counter according to the "set_option",  turn
on/off or reset specified monitor counter. */
static
void
innodb_monitor_set_option(
/*======================*/
	const monitor_info_t* monitor_info,/*!< in: monitor info for the monitor
					to set */
	mon_option_t	set_option)	/*!< in: Turn on/off reset the
					counter */
{
	monitor_id_t	monitor_id = monitor_info->monitor_id;

	/* If module type is MONITOR_GROUP_MODULE, it cannot be
	turned on/off individually. It should never use this
	function to set options */
	ut_a(!(monitor_info->monitor_type & MONITOR_GROUP_MODULE));

	switch (set_option) {
	case MONITOR_TURN_ON:
		MONITOR_ON(monitor_id);
		MONITOR_INIT(monitor_id);
		MONITOR_SET_START(monitor_id);

		/* If the monitor to be turned on uses
		exisitng monitor counter (status variable),
		make special processing to remember existing
		counter value. */
		if (monitor_info->monitor_type & MONITOR_EXISTING) {
			srv_mon_process_existing_counter(
				monitor_id, MONITOR_TURN_ON);
		}

		if (MONITOR_IS_ON(MONITOR_LATCHES)) {

			mutex_monitor->enable();
		}
		break;

	case MONITOR_TURN_OFF:
		if (monitor_info->monitor_type & MONITOR_EXISTING) {
			srv_mon_process_existing_counter(
				monitor_id, MONITOR_TURN_OFF);
		}

		MONITOR_OFF(monitor_id);
		MONITOR_SET_OFF(monitor_id);

		if (!MONITOR_IS_ON(MONITOR_LATCHES)) {

			mutex_monitor->disable();
		}
		break;

	case MONITOR_RESET_VALUE:
		srv_mon_reset(monitor_id);

		if (monitor_id == (MONITOR_LATCHES)) {

			mutex_monitor->reset();
		}
		break;

	case MONITOR_RESET_ALL_VALUE:
		srv_mon_reset_all(monitor_id);
		mutex_monitor->reset();
		break;

	default:
		ut_error;
	}
}

/****************************************************************//**
Find matching InnoDB monitor counters and update their status
according to the "set_option",  turn on/off or reset specified
monitor counter. */
static
void
innodb_monitor_update_wildcard(
/*===========================*/
	const char*	name,		/*!< in: monitor name to match */
	mon_option_t	set_option)	/*!< in: the set option, whether
					to turn on/off or reset the counter */
{
	ut_a(name);

	for (ulint use = 0; use < NUM_MONITOR; use++) {
		ulint		type;
		monitor_id_t	monitor_id = static_cast<monitor_id_t>(use);
		monitor_info_t*	monitor_info;

		if (!innobase_wildcasecmp(
			srv_mon_get_name(monitor_id), name)) {
			monitor_info = srv_mon_get_info(monitor_id);

			type = monitor_info->monitor_type;

			/* If the monitor counter is of MONITOR_MODULE
			type, skip it. Except for those also marked with
			MONITOR_GROUP_MODULE flag, which can be turned
			on only as a module. */
			if (!(type & MONITOR_MODULE)
			     && !(type & MONITOR_GROUP_MODULE)) {
				innodb_monitor_set_option(monitor_info,
							  set_option);
			}

			/* Need to special handle counters marked with
			MONITOR_GROUP_MODULE, turn on the whole module if
			any one of it comes here. Currently, only
			"module_buf_page" is marked with MONITOR_GROUP_MODULE */
			if (type & MONITOR_GROUP_MODULE) {
				if ((monitor_id >= MONITOR_MODULE_BUF_PAGE)
				     && (monitor_id < MONITOR_MODULE_OS)) {
					if (set_option == MONITOR_TURN_ON
					    && MONITOR_IS_ON(
						MONITOR_MODULE_BUF_PAGE)) {
						continue;
					}

					srv_mon_set_module_control(
						MONITOR_MODULE_BUF_PAGE,
						set_option);
				} else {
					/* If new monitor is added with
					MONITOR_GROUP_MODULE, it needs
					to be added here. */
					ut_ad(0);
				}
			}
		}
	}
}

/*************************************************************//**
Given a configuration variable name, find corresponding monitor counter
and return its monitor ID if found.
@return monitor ID if found, MONITOR_NO_MATCH if there is no match */
static
ulint
innodb_monitor_id_by_name_get(
/*==========================*/
	const char*	name)	/*!< in: monitor counter namer */
{
	ut_a(name);

	/* Search for wild character '%' in the name, if
	found, we treat it as a wildcard match. We do not search for
	single character wildcard '_' since our monitor names already contain
	such character. To avoid confusion, we request user must include
	at least one '%' character to activate the wildcard search. */
	if (strchr(name, '%')) {
		return(MONITOR_WILDCARD_MATCH);
	}

	/* Not wildcard match, check for an exact match */
	for (ulint i = 0; i < NUM_MONITOR; i++) {
		if (!innobase_strcasecmp(
			name, srv_mon_get_name(static_cast<monitor_id_t>(i)))) {
			return(i);
		}
	}

	return(MONITOR_NO_MATCH);
}
/*************************************************************//**
Validate that the passed in monitor name matches at least one
monitor counter name with wildcard compare.
@return TRUE if at least one monitor name matches */
static
ibool
innodb_monitor_validate_wildcard_name(
/*==================================*/
	const char*	name)	/*!< in: monitor counter namer */
{
	for (ulint i = 0; i < NUM_MONITOR; i++) {
		if (!innobase_wildcasecmp(
			srv_mon_get_name(static_cast<monitor_id_t>(i)), name)) {
			return(TRUE);
		}
	}

	return(FALSE);
}
/*************************************************************//**
Validate the passed in monitor name, find and save the
corresponding monitor name in the function parameter "save".
@return 0 if monitor name is valid */
static
int
innodb_monitor_valid_byname(
/*========================*/
	void*			save,	/*!< out: immediate result
					for update function */
	const char*		name)	/*!< in: incoming monitor name */
{
	ulint		use;
	monitor_info_t*	monitor_info;

	if (!name) {
		return(1);
	}

	use = innodb_monitor_id_by_name_get(name);

	/* No monitor name matches, nor it is wildcard match */
	if (use == MONITOR_NO_MATCH) {
		return(1);
	}

	if (use < NUM_MONITOR) {
		monitor_info = srv_mon_get_info((monitor_id_t) use);

		/* If the monitor counter is marked with
		MONITOR_GROUP_MODULE flag, then this counter
		cannot be turned on/off individually, instead
		it shall be turned on/off as a group using
		its module name */
		if ((monitor_info->monitor_type & MONITOR_GROUP_MODULE)
		    && (!(monitor_info->monitor_type & MONITOR_MODULE))) {
			sql_print_warning(
				"Monitor counter '%s' cannot"
				" be turned on/off individually."
				" Please use its module name"
				" to turn on/off the counters"
				" in the module as a group.\n",
				name);

			return(1);
		}

	} else {
		ut_a(use == MONITOR_WILDCARD_MATCH);

		/* For wildcard match, if there is not a single monitor
		counter name that matches, treat it as an invalid
		value for the system configuration variables */
		if (!innodb_monitor_validate_wildcard_name(name)) {
			return(1);
		}
	}

	/* Save the configure name for innodb_monitor_update() */
	*static_cast<const char**>(save) = name;

	return(0);
}
/*************************************************************//**
Validate passed-in "value" is a valid monitor counter name.
This function is registered as a callback with MySQL.
@return 0 for valid name */
static
int
innodb_monitor_validate(
/*====================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming string */
{
	const char*	name;
	char*		monitor_name;
	char		buff[STRING_BUFFER_USUAL_SIZE];
	int		len = sizeof(buff);
	int		ret;

	ut_a(save != NULL);
	ut_a(value != NULL);

	name = value->val_str(value, buff, &len);

	/* monitor_name could point to memory from MySQL
	or buff[]. Always dup the name to memory allocated
	by InnoDB, so we can access it in another callback
	function innodb_monitor_update() and free it appropriately */
	if (name) {
		monitor_name = my_strdup(PSI_INSTRUMENT_ME,
                                         name, MYF(0));
	} else {
		return(1);
	}

	ret = innodb_monitor_valid_byname(save, monitor_name);

	if (ret) {
		/* Validation failed */
		my_free(monitor_name);
	} else {
		/* monitor_name will be freed in separate callback function
		innodb_monitor_update(). Assert "save" point to
		the "monitor_name" variable */
		ut_ad(*static_cast<char**>(save) == monitor_name);
	}

	return(ret);
}

/****************************************************************//**
Update the system variable innodb_enable(disable/reset/reset_all)_monitor
according to the "set_option" and turn on/off or reset specified monitor
counter. */
static
void
innodb_monitor_update(
/*==================*/
	THD*			thd,		/*!< in: thread handle */
	void*			var_ptr,	/*!< out: where the
						formal string goes */
	const void*		save,		/*!< in: immediate result
						from check function */
	mon_option_t		set_option,	/*!< in: the set option,
						whether to turn on/off or
						reset the counter */
	ibool			free_mem)	/*!< in: whether we will
						need to free the memory */
{
	monitor_info_t*	monitor_info;
	ulint		monitor_id;
	ulint		err_monitor = 0;
	const char*	name;

	ut_a(save != NULL);

	name = *static_cast<const char*const*>(save);

	if (!name) {
		monitor_id = MONITOR_DEFAULT_START;
	} else {
		monitor_id = innodb_monitor_id_by_name_get(name);

		/* Double check we have a valid monitor ID */
		if (monitor_id == MONITOR_NO_MATCH) {
			return;
		}
	}

	if (monitor_id == MONITOR_DEFAULT_START) {
		/* If user set the variable to "default", we will
		print a message and make this set operation a "noop".
		The check is being made here is because "set default"
		does not go through validation function */
		if (thd) {
			push_warning_printf(
				thd, Sql_condition::SL_WARNING,
				ER_NO_DEFAULT,
				"Default value is not defined for"
				" this set option. Please specify"
				" correct counter or module name.");
		} else {
			sql_print_error(
				"Default value is not defined for"
				" this set option. Please specify"
				" correct counter or module name.\n");
		}

		if (var_ptr) {
			*(const char**) var_ptr = NULL;
		}
	} else if (monitor_id == MONITOR_WILDCARD_MATCH) {
		innodb_monitor_update_wildcard(name, set_option);
	} else {
		monitor_info = srv_mon_get_info(
			static_cast<monitor_id_t>(monitor_id));

		ut_a(monitor_info);

		/* If monitor is already truned on, someone could already
		collect monitor data, exit and ask user to turn off the
		monitor before turn it on again. */
		if (set_option == MONITOR_TURN_ON
		    && MONITOR_IS_ON(monitor_id)) {
			err_monitor = monitor_id;
			goto exit;
		}

		if (var_ptr) {
			*(const char**) var_ptr = monitor_info->monitor_name;
		}

		/* Depending on the monitor name is for a module or
		a counter, process counters in the whole module or
		individual counter. */
		if (monitor_info->monitor_type & MONITOR_MODULE) {
			srv_mon_set_module_control(
				static_cast<monitor_id_t>(monitor_id),
				set_option);
		} else {
			innodb_monitor_set_option(monitor_info, set_option);
		}
	}
exit:
	/* Only if we are trying to turn on a monitor that already
	been turned on, we will set err_monitor. Print related
	information */
	if (err_monitor) {
		sql_print_warning("InnoDB: Monitor %s is already enabled.",
				  srv_mon_get_name((monitor_id_t) err_monitor));
	}

	if (free_mem && name) {
		my_free((void*) name);
	}

	return;
}

#ifdef _WIN32
/*************************************************************//**
Validate if passed-in "value" is a valid value for
innodb_buffer_pool_filename. On Windows, file names with colon (:)
are not allowed.

@return 0 for valid name */
static
int
innodb_srv_buf_dump_filename_validate(
/*==================================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming string */
{
	char		buff[OS_FILE_MAX_PATH];
	int		len = sizeof(buff);

	ut_a(save != NULL);
	ut_a(value != NULL);

	const char*	buf_name = value->val_str(value, buff, &len);

	if (buf_name != NULL) {
		if (is_filename_allowed(buf_name, len, FALSE)){
			*static_cast<const char**>(save) = buf_name;
			return(0);
		} else {
			push_warning_printf(thd,
				Sql_condition::SL_WARNING,
				ER_WRONG_ARGUMENTS,
				"InnoDB: innodb_buffer_pool_filename"
				" cannot have colon (:) in the file name.");

		}
	}

	return(1);
}
#else /* _WIN32 */
# define innodb_srv_buf_dump_filename_validate NULL
#endif /* _WIN32 */

#ifdef UNIV_DEBUG
static char* srv_buffer_pool_evict;

/****************************************************************//**
Evict all uncompressed pages of compressed tables from the buffer pool.
Keep the compressed pages in the buffer pool.
@return whether all uncompressed pages were evicted */
static __attribute__((warn_unused_result))
bool
innodb_buffer_pool_evict_uncompressed(void)
/*=======================================*/
{
	bool	all_evicted = true;

	for (ulint i = 0; i < srv_buf_pool_instances; i++) {
		buf_pool_t*	buf_pool = &buf_pool_ptr[i];

		mutex_enter(&buf_pool->LRU_list_mutex);

		for (buf_block_t* block = UT_LIST_GET_LAST(
			     buf_pool->unzip_LRU);
		     block != NULL; ) {
			buf_block_t*	prev_block = UT_LIST_GET_PREV(
				unzip_LRU, block);
			ut_ad(buf_block_get_state(block)
			      == BUF_BLOCK_FILE_PAGE);
			ut_ad(block->in_unzip_LRU_list);
			ut_ad(block->page.in_LRU_list);

			rw_lock_t* hash_lock
				= buf_page_hash_lock_get(buf_pool,
							 block->page.id);
			rw_lock_x_lock(hash_lock);
			mutex_enter(&block->mutex);

			if (!buf_page_can_relocate(&block->page)
			    || block->page.oldest_modification) {
				rw_lock_x_unlock(hash_lock);
				mutex_exit(&block->mutex);
				all_evicted = false;
			} else {
				buf_LRU_free_one_page(&block->page, false);
			}

			block = prev_block;
		}

		mutex_exit(&buf_pool->LRU_list_mutex);
	}

	return(all_evicted);
}

/****************************************************************//**
Called on SET GLOBAL innodb_buffer_pool_evict=...
Handles some values specially, to evict pages from the buffer pool.
SET GLOBAL innodb_buffer_pool_evict='uncompressed'
evicts all uncompressed page frames of compressed tablespaces. */
static
void
innodb_buffer_pool_evict_update(
/*============================*/
	THD*			thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*var,	/*!< in: pointer to system variable */
	void*			var_ptr,/*!< out: ignored */
	const void*		save)	/*!< in: immediate result
					from check function */
{
	if (const char* op = *static_cast<const char*const*>(save)) {
		if (!strcmp(op, "uncompressed")) {
			for (uint tries = 0; tries < 10000; tries++) {
				if (innodb_buffer_pool_evict_uncompressed()) {
					return;
				}

				os_thread_sleep(10000);
			}

			/* We failed to evict all uncompressed pages. */
			ut_ad(0);
		}
	}
}
#endif /* UNIV_DEBUG */

/****************************************************************//**
Update the system variable innodb_monitor_enable and enable
specified monitor counter.
This function is registered as a callback with MySQL. */
static
void
innodb_enable_monitor_update(
/*=========================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	innodb_monitor_update(thd, var_ptr, save, MONITOR_TURN_ON, TRUE);
}

/****************************************************************//**
Update the system variable innodb_monitor_disable and turn
off specified monitor counter. */
static
void
innodb_disable_monitor_update(
/*==========================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	innodb_monitor_update(thd, var_ptr, save, MONITOR_TURN_OFF, TRUE);
}

/****************************************************************//**
Update the system variable innodb_monitor_reset and reset
specified monitor counter(s).
This function is registered as a callback with MySQL. */
static
void
innodb_reset_monitor_update(
/*========================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	innodb_monitor_update(thd, var_ptr, save, MONITOR_RESET_VALUE, TRUE);
}

/****************************************************************//**
Update the system variable innodb_monitor_reset_all and reset
all value related monitor counter.
This function is registered as a callback with MySQL. */
static
void
innodb_reset_all_monitor_update(
/*============================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	innodb_monitor_update(thd, var_ptr, save, MONITOR_RESET_ALL_VALUE,
			      TRUE);
}

/****************************************************************//**
Parse and enable InnoDB monitor counters during server startup.
User can list the monitor counters/groups to be enable by specifying
"loose-innodb_monitor_enable=monitor_name1;monitor_name2..."
in server configuration file or at the command line. The string
separate could be ";", "," or empty space. */
static
void
innodb_enable_monitor_at_startup(
/*=============================*/
	char*	str)	/*!< in/out: monitor counter enable list */
{
	static const char*	sep = " ;,";
	char*			last;

	ut_a(str);

	/* Walk through the string, and separate each monitor counter
	and/or counter group name, and calling innodb_monitor_update()
	if successfully updated. Please note that the "str" would be
	changed by strtok_r() as it walks through it. */
	for (char* option = my_strtok_r(str, sep, &last);
	     option;
	     option = my_strtok_r(NULL, sep, &last)) {
		ulint	ret;
		char*	option_name;

		ret = innodb_monitor_valid_byname(&option_name, option);

		/* The name is validated if ret == 0 */
		if (!ret) {
			innodb_monitor_update(NULL, NULL, &option,
					      MONITOR_TURN_ON, FALSE);
		} else {
			sql_print_warning("Invalid monitor counter"
					  " name: '%s'", option);
		}
	}
}

#if defined(UNIV_LINUX) && (defined(UNIV_DEBUG) || (UNIV_PERF_DEBUG))

/****************************************************************//**
Update the innodb_sched_priority_purge variable and set the thread
priorities accordingly.  */
static
void
innodb_sched_priority_purge_update(
/*===============================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	ulint	priority = *static_cast<const ulint *>(save);

	if (srv_read_only_mode) {
		return;
	}

	for (ulint i = 0; i < srv_n_purge_threads; i++) {

		ulint actual_priority
			= os_thread_set_priority(srv_purge_tids[i], priority);
		if (UNIV_UNLIKELY(actual_priority != priority)) {

			push_warning_printf(thd,
					    Sql_condition::SL_WARNING,
					    ER_WRONG_ARGUMENTS,
					    "Failed to set the purge "
					    "thread priority to %lu, the "
					    "current priority is %lu, "
					    "aborting priority update",
					    priority, actual_priority);
			return;
		}
	}

	srv_sched_priority_purge = priority;
}

/****************************************************************//**
Update the innodb_sched_priority_io variable and set the thread
priorities accordingly.  */
static
void
innodb_sched_priority_io_update(
/*============================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
					        system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	ulint	priority = *static_cast<const ulint *>(save);

	for (ulint i = 0; i < srv_n_file_io_threads; i++) {

		ulint actual_priority = os_thread_set_priority(srv_io_tids[i],
							       priority);

		if (UNIV_UNLIKELY(actual_priority != priority)) {

			push_warning_printf(thd,
					    Sql_condition::SL_WARNING,
					    ER_WRONG_ARGUMENTS,
					    "Failed to set the I/O "
					    "thread priority to %lu, the "
					    "current priority is %lu, "
					    "aborting priority update",
					    priority, actual_priority);
			return;
		}
	}

	srv_sched_priority_io = priority;
}

/****************************************************************//**
Update the innodb_sched_priority_master variable and set the thread
priorities accordingly.  */
static
void
innodb_sched_priority_master_update(
/*================================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	ulint	priority = *static_cast<const lint *>(save);
	ulint	actual_priority;

	if (srv_read_only_mode) {
		return;
	}

	actual_priority = os_thread_set_priority(srv_master_tid, priority);
	if (UNIV_UNLIKELY(actual_priority != priority)) {

		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "Failed to set the master thread "
				    "priority to %lu,  "
				    "the current priority is %lu", priority,
				    actual_priority);
	} else {

		srv_sched_priority_master = priority;
	}
}

#endif /* defined(UNIV_LINUX) && (defined(UNIV_DEBUG) || (UNIV_PERF_DEBUG)) */

#ifdef UNIV_DEBUG
/*************************************************************//**
Check if it is a valid value of innodb_track_changed_pages.
Changed pages tracking is not working correctly without initialization
procedure on server startup. The function allows to temporary
disable tracking, but only if the feature was enabled on startup.
This function is registered as a callback with MySQL.
@return	0 for valid innodb_track_changed_pages */
static
int
innodb_track_changed_pages_validate(
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming bool */
{
	static bool     enabled_on_startup = false;
	long long	intbuf = 0;

	if (value->val_int(value, &intbuf)) {
		/* The value is NULL. That is invalid. */
		return 1;
	}

	if (srv_track_changed_pages || enabled_on_startup) {
		enabled_on_startup = true;
		*reinterpret_cast<ulong*>(save)
			= static_cast<ulong>(intbuf);
		return 0;
	}

	if (intbuf == srv_track_changed_pages)
		return 0;

	return 1;
}
#endif

/****************************************************************//**
Callback function for accessing the InnoDB variables from MySQL:
SHOW VARIABLES. */
static
int
show_innodb_vars(
/*=============*/
	THD*		thd,
	SHOW_VAR*	var,
	char*		buff)
{
	innodb_export_status();
	var->type = SHOW_ARRAY;
	var->value = (char*) &innodb_status_variables;
  var->scope = SHOW_SCOPE_GLOBAL;

	return(0);
}

/****************************************************************//**
This function checks each index name for a table against reserved
system default primary index name 'GEN_CLUST_INDEX'. If a name
matches, this function pushes an warning message to the client,
and returns true.
@return true if the index name matches the reserved name */
bool
innobase_index_name_is_reserved(
/*============================*/
	THD*		thd,		/*!< in/out: MySQL connection */
	const KEY*	key_info,	/*!< in: Indexes to be created */
	ulint		num_of_keys)	/*!< in: Number of indexes to
					be created. */
{
	const KEY*	key;
	uint		key_num;	/* index number */

	for (key_num = 0; key_num < num_of_keys; key_num++) {
		key = &key_info[key_num];

		if (innobase_strcasecmp(key->name,
					innobase_index_reserve_name) == 0) {
			/* Push warning to mysql */
			push_warning_printf(thd,
					    Sql_condition::SL_WARNING,
					    ER_WRONG_NAME_FOR_INDEX,
					    "Cannot Create Index with name"
					    " '%s'. The name is reserved"
					    " for the system default primary"
					    " index.",
					    innobase_index_reserve_name);

			my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0),
				 innobase_index_reserve_name);

			return(true);
		}
	}

	return(false);
}

/***********************************************************************
Retrieve the FTS Relevance Ranking result for doc with doc_id
of m_prebuilt->fts_doc_id
@return the relevance ranking value */
float
innobase_fts_retrieve_ranking(
/*============================*/
		FT_INFO * fts_hdl)	/*!< in: FTS handler */
{
	fts_result_t*	result;
	row_prebuilt_t*	ft_prebuilt;

	result = reinterpret_cast<NEW_FT_INFO*>(fts_hdl)->ft_result;

	ft_prebuilt = reinterpret_cast<NEW_FT_INFO*>(fts_hdl)->ft_prebuilt;

	fts_ranking_t*  ranking = rbt_value(fts_ranking_t, result->current);
	ft_prebuilt->fts_doc_id= ranking->doc_id;

	return(ranking->rank);
}

/***********************************************************************
functions for kill session of idle transaction */
bool
innobase_thd_is_idle(
/*=================*/
	const void*	thd)	/*!< in: thread handle (THD*) */
{
	return(thd_command((const THD*) thd) == COM_SLEEP);
}

ib_uint64_t
innobase_thd_get_start_time(
/*========================*/
	const void*	thd)	/*!< in: thread handle (THD*) */
{
	return((ib_uint64_t)thd_start_time((const THD*) thd));
}

/***********************************************************************
Free the memory for the FTS handler */
void
innobase_fts_close_ranking(
/*=======================*/
		FT_INFO * fts_hdl)
{
	fts_result_t*	result;

	result = reinterpret_cast<NEW_FT_INFO*>(fts_hdl)->ft_result;

	fts_query_free_result(result);

	my_free((uchar*) fts_hdl);

	return;
}

void
innobase_thd_kill(
/*==============*/
	ulong	thd_id)
{
	thd_kill(thd_id);
}

/***********************************************************************
Find and Retrieve the FTS Relevance Ranking result for doc with doc_id
of m_prebuilt->fts_doc_id
@return the relevance ranking value */
float
innobase_fts_find_ranking(
/*======================*/
		FT_INFO*	fts_hdl,	/*!< in: FTS handler */
		uchar*		record,		/*!< in: Unused */
		uint		len)		/*!< in: Unused */
{
	fts_result_t*	result;
	row_prebuilt_t*	ft_prebuilt;

	ft_prebuilt = reinterpret_cast<NEW_FT_INFO*>(fts_hdl)->ft_prebuilt;
	result = reinterpret_cast<NEW_FT_INFO*>(fts_hdl)->ft_result;

	/* Retrieve the ranking value for doc_id with value of
	m_prebuilt->fts_doc_id */
	return(fts_retrieve_ranking(result, ft_prebuilt->fts_doc_id));
}

#ifdef UNIV_DEBUG
static my_bool	innodb_background_drop_list_empty = TRUE;
static my_bool	innodb_purge_run_now = TRUE;
static my_bool	innodb_purge_stop_now = TRUE;
static my_bool	innodb_log_checkpoint_now = TRUE;
static my_bool	innodb_buf_flush_list_now = TRUE;
static my_bool	innodb_track_redo_log_now = TRUE;
static uint	innodb_merge_threshold_set_all_debug
	= DICT_INDEX_MERGE_THRESHOLD_DEFAULT;

/** Wait for the background drop list to become empty. */
static
void
wait_background_drop_list_empty(
	THD*				thd	/*!< in: thread handle */
					__attribute__((unused)),
	struct st_mysql_sys_var*	var	/*!< in: pointer to system
						variable */
					__attribute__((unused)),
	void*				var_ptr	/*!< out: where the formal
						string goes */
					__attribute__((unused)),
	const void*			save)	/*!< in: immediate result from
						check function */
{
	row_wait_for_background_drop_list_empty();
}

/****************************************************************//**
Set the purge state to RUN. If purge is disabled then it
is a no-op. This function is registered as a callback with MySQL. */
static
void
purge_run_now_set(
/*==============*/
	THD*				thd	/*!< in: thread handle */
					__attribute__((unused)),
	struct st_mysql_sys_var*	var	/*!< in: pointer to system
						variable */
					__attribute__((unused)),
	void*				var_ptr	/*!< out: where the formal
						string goes */
					__attribute__((unused)),
	const void*			save)	/*!< in: immediate result from
						check function */
{
	if (*(my_bool*) save && trx_purge_state() != PURGE_STATE_DISABLED) {
		trx_purge_run();
	}
}

/****************************************************************//**
Set the purge state to STOP. If purge is disabled then it
is a no-op. This function is registered as a callback with MySQL. */
static
void
purge_stop_now_set(
/*===============*/
	THD*				thd	/*!< in: thread handle */
					__attribute__((unused)),
	struct st_mysql_sys_var*	var	/*!< in: pointer to system
						variable */
					__attribute__((unused)),
	void*				var_ptr	/*!< out: where the formal
						string goes */
					__attribute__((unused)),
	const void*			save)	/*!< in: immediate result from
						check function */
{
	if (*(my_bool*) save && trx_purge_state() != PURGE_STATE_DISABLED) {
		trx_purge_stop();
	}
}

/****************************************************************//**
Force innodb to checkpoint. */
static
void
checkpoint_now_set(
/*===============*/
	THD*				thd	/*!< in: thread handle */
					__attribute__((unused)),
	struct st_mysql_sys_var*	var	/*!< in: pointer to system
						variable */
					__attribute__((unused)),
	void*				var_ptr	/*!< out: where the formal
						string goes */
					__attribute__((unused)),
	const void*			save)	/*!< in: immediate result from
						check function */
{
	if (*(my_bool*) save) {
		while (log_sys->last_checkpoint_lsn
		       + SIZE_OF_MLOG_CHECKPOINT
		       + (log_sys->append_on_checkpoint != NULL
			  ? log_sys->append_on_checkpoint->size() : 0)
		       < log_sys->lsn) {
			log_make_checkpoint_at(LSN_MAX, TRUE);
			fil_flush_file_spaces(FIL_TYPE_LOG);
		}
		fil_write_flushed_lsn(log_sys->lsn);
	}
}

/****************************************************************//**
Force a dirty pages flush now. */
static
void
buf_flush_list_now_set(
/*===================*/
	THD*				thd	/*!< in: thread handle */
					__attribute__((unused)),
	struct st_mysql_sys_var*	var	/*!< in: pointer to system
						variable */
					__attribute__((unused)),
	void*				var_ptr	/*!< out: where the formal
						string goes */
					__attribute__((unused)),
	const void*			save)	/*!< in: immediate result from
						check function */
{
	if (*(my_bool*) save) {
		buf_flush_sync_all_buf_pools();
	}
}

/****************************************************************//**
Force log tracker to track the log synchronously.  */
static
void
track_redo_log_now_set(
/*===================*/
	THD*				thd	/*!< in: thread handle */
	__attribute__((unused)),
	struct st_mysql_sys_var*	var	/*!< in: pointer to system
						  variable */
	__attribute__((unused)),
	void*				var_ptr	/*!< out: where the formal
						  string goes */
	__attribute__((unused)),
	const void*			save)	/*!< in: immediate result from
						  check function */
{
	if (*(my_bool*) save && srv_track_changed_pages) {

		log_online_follow_redo_log();
	}
}

/** Override current MERGE_THRESHOLD setting for all indexes at dictionary
now.
@param[in]	thd	thread handle
@param[in]	var	pointer to system variable
@param[out]	var_ptr	where the formal string goes
@param[in]	save	immediate result from check function */
static
void
innodb_merge_threshold_set_all_debug_update(
	THD*				thd,
	struct st_mysql_sys_var*	var,
	void*				var_ptr,
	const void*			save)
{
	innodb_merge_threshold_set_all_debug
		= (*static_cast<const uint*>(save));
	dict_set_merge_threshold_all_debug(
		innodb_merge_threshold_set_all_debug);
}
#endif /* UNIV_DEBUG */

/***********************************************************************
@return version of the extended FTS API */
uint
innobase_fts_get_version()
/*======================*/
{
	/* Currently this doesn't make much sense as returning
	HA_CAN_FULLTEXT_EXT automatically mean this version is supported.
	This supposed to ease future extensions.  */
	return(2);
}

/***********************************************************************
@return Which part of the extended FTS API is supported */
ulonglong
innobase_fts_flags()
/*================*/
{
	return(FTS_ORDERED_RESULT | FTS_DOCID_IN_RESULT);
}


/***********************************************************************
Find and Retrieve the FTS doc_id for the current result row
@return the document ID */
ulonglong
innobase_fts_retrieve_docid(
/*========================*/
	FT_INFO_EXT*	fts_hdl)	/*!< in: FTS handler */
{
	fts_result_t*	result;
	row_prebuilt_t* ft_prebuilt;

	ft_prebuilt = reinterpret_cast<NEW_FT_INFO *>(fts_hdl)->ft_prebuilt;
	result = reinterpret_cast<NEW_FT_INFO *>(fts_hdl)->ft_result;

	if (ft_prebuilt->read_just_key) {

		fts_ranking_t* ranking =
			rbt_value(fts_ranking_t, result->current);

		return(ranking->doc_id);
	}

	return(ft_prebuilt->fts_doc_id);
}

ulong
innobase_thd_get_thread_id(
/*=======================*/
	const void*	thd)
{
	return(thd_get_thread_id((const THD*) thd));
}

/***********************************************************************
Find and retrieve the size of the current result
@return number of matching rows */
ulonglong
innobase_fts_count_matches(
/*=======================*/
	FT_INFO_EXT*	fts_hdl)	/*!< in: FTS handler */
{
	NEW_FT_INFO*	handle = reinterpret_cast<NEW_FT_INFO *>(fts_hdl);

	if (handle->ft_result->rankings_by_id != 0) {
		return rbt_size(handle->ft_result->rankings_by_id);
	} else {
		return(0);
	}
}

/* These variables are never read by InnoDB or changed. They are a kind of
dummies that are needed by the MySQL infrastructure to call
buffer_pool_dump_now(), buffer_pool_load_now() and buffer_pool_load_abort()
by the user by doing:
  SET GLOBAL innodb_buffer_pool_dump_now=ON;
  SET GLOBAL innodb_buffer_pool_load_now=ON;
  SET GLOBAL innodb_buffer_pool_load_abort=ON;
Their values are read by MySQL and displayed to the user when the variables
are queried, e.g.:
  SELECT @@innodb_buffer_pool_dump_now;
  SELECT @@innodb_buffer_pool_load_now;
  SELECT @@innodb_buffer_pool_load_abort; */
static my_bool	innodb_buffer_pool_dump_now = FALSE;
static my_bool	innodb_buffer_pool_load_now = FALSE;
static my_bool	innodb_buffer_pool_load_abort = FALSE;

/****************************************************************//**
Trigger a dump of the buffer pool if innodb_buffer_pool_dump_now is set
to ON. This function is registered as a callback with MySQL. */
static
void
buffer_pool_dump_now(
/*=================*/
	THD*				thd	/*!< in: thread handle */
					__attribute__((unused)),
	struct st_mysql_sys_var*	var	/*!< in: pointer to system
						variable */
					__attribute__((unused)),
	void*				var_ptr	/*!< out: where the formal
						string goes */
					__attribute__((unused)),
	const void*			save)	/*!< in: immediate result from
						check function */
{
	if (*(my_bool*) save && !srv_read_only_mode) {
		buf_dump_start();
	}
}

/****************************************************************//**
Trigger a load of the buffer pool if innodb_buffer_pool_load_now is set
to ON. This function is registered as a callback with MySQL. */
static
void
buffer_pool_load_now(
/*=================*/
	THD*				thd	/*!< in: thread handle */
					__attribute__((unused)),
	struct st_mysql_sys_var*	var	/*!< in: pointer to system
						variable */
					__attribute__((unused)),
	void*				var_ptr	/*!< out: where the formal
						string goes */
					__attribute__((unused)),
	const void*			save)	/*!< in: immediate result from
						check function */
{
	if (*(my_bool*) save) {
		buf_load_start();
	}
}

/****************************************************************//**
Abort a load of the buffer pool if innodb_buffer_pool_load_abort
is set to ON. This function is registered as a callback with MySQL. */
static
void
buffer_pool_load_abort(
/*===================*/
	THD*				thd	/*!< in: thread handle */
					__attribute__((unused)),
	struct st_mysql_sys_var*	var	/*!< in: pointer to system
						variable */
					__attribute__((unused)),
	void*				var_ptr	/*!< out: where the formal
						string goes */
					__attribute__((unused)),
	const void*			save)	/*!< in: immediate result from
						check function */
{
	if (*(my_bool*) save) {
		buf_load_abort();
	}
}

/****************************************************************//**
Update the system variable innodb_log_write_ahead_size using the "saved"
value. This function is registered as a callback with MySQL. */
static
void
innodb_log_write_ahead_size_update(
/*===============================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to
						system variable */
	void*				var_ptr,/*!< out: where the
						formal string goes */
	const void*			save)	/*!< in: immediate result
						from check function */
{
	ulong	val = OS_FILE_LOG_BLOCK_SIZE;
	ulong	in_val = *static_cast<const ulong*>(save);

	while (val < in_val) {
		val = val * 2;
	}

	if (val > UNIV_PAGE_SIZE) {
		val = UNIV_PAGE_SIZE;
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "innodb_log_write_ahead_size cannot"
				    " be set higher than innodb_page_size.");
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "Setting innodb_log_write_ahead_size"
				    " to %lu",
				    UNIV_PAGE_SIZE);
	} else if (val != in_val) {
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "innodb_log_write_ahead_size should be"
				    " set 2^n value and larger than 512.");
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "Setting innodb_log_write_ahead_size"
				    " to %lu",
				    val);
	}

	srv_log_write_ahead_size = val;
}

/** Update innodb_status_output or innodb_status_output_locks,
which control InnoDB "status monitor" output to the error log.
@param[out]	var_ptr	current value
@param[in]	save	to-be-assigned value */
static
void
innodb_status_output_update(
	THD*,
	struct st_mysql_sys_var*,
	void*				var_ptr,
	const void*			save)
{
	*static_cast<my_bool*>(var_ptr) = *static_cast<const my_bool*>(save);
	/* The lock timeout monitor thread also takes care of this
	output. */
	os_event_set(lock_sys->timeout_event);
}

/*************************************************************//**
Empty free list algorithm.
Checks if buffer pool is big enough to enable backoff algorithm.
InnoDB empty free list algorithm backoff requires free pages
from LRU for the best performance.
buf_LRU_buf_pool_running_out cancels query if 1/4 of 
buffer pool belongs to LRU or freelist.
At the same time buf_flush_LRU_list_batch
keeps up to BUF_LRU_MIN_LEN in LRU.
In order to avoid deadlock baclkoff requires buffer pool
to be at least 4*BUF_LRU_MIN_LEN,
but flush peformance is bad because of trashing
and additional BUF_LRU_MIN_LEN pages are requested.
@return	true if it's possible to enable backoff. */
static
bool
innodb_empty_free_list_algorithm_backoff_allowed(
	srv_empty_free_list_t	algorithm,	/*!< in: desired algorithm
						from srv_empty_free_list_t */
	long long		buf_pool_pages)	/*!< in: total number
						of pages inside buffer pool */
{
	return(buf_pool_pages >= BUF_LRU_MIN_LEN * (4 + 1)
			|| algorithm != SRV_EMPTY_FREE_LIST_BACKOFF);
}

/*************************************************************//**
Empty free list algorithm. This function is registered as
a callback with MySQL. 
@return	0 for valid algorithm */
static
int
innodb_srv_empty_free_list_algorithm_validate(
/*===========================*/
	THD*				thd,	/*!< in: thread handle */
	struct st_mysql_sys_var*	var,	/*!< in: pointer to system
						variable */
	void*				save,	/*!< out: immediate result
						for update function */
	struct st_mysql_value*		value)	/*!< in: incoming string */
{
	const char*	algorithm_name;
	char		buff[STRING_BUFFER_USUAL_SIZE];
	int		len = sizeof(buff);
	ulint	algo;
	srv_empty_free_list_t 		algorithm;

	algorithm_name = value->val_str(value, buff, &len);

	if (!algorithm_name) {
		return(1);
	}

	for (algo = 0; algo < array_elements(
				innodb_empty_free_list_algorithm_names
				) - 1;
			algo++) {
		if (!innobase_strcasecmp(
				algorithm_name,
				innodb_empty_free_list_algorithm_names[algo]))
			break;
	}

	if (algo == array_elements( innodb_empty_free_list_algorithm_names) - 1)
		return(1);

	algorithm = static_cast<srv_empty_free_list_t>(algo);
	if (!innodb_empty_free_list_algorithm_backoff_allowed(
				algorithm,
				innobase_buffer_pool_size / srv_page_size)) {
		sql_print_warning(
				"InnoDB: innodb_empty_free_list_algorithm "
				"= 'backoff' requires at least"
				" 20MB buffer pool.\n");
		return(1);
	}

	*reinterpret_cast<ulong*>(save) = static_cast<ulong>(algorithm);
	return(0);
}

/** Update the innodb_log_checksums parameter.
@param[in]	thd	thread handle
@param[in]	var	system variable
@param[out]	var_ptr	current value
@param[in]	save	immediate result from check function */
static
void
innodb_log_checksums_update(
	THD*				thd,
	struct st_mysql_sys_var*	var,
	void*				var_ptr,
	const void*			save)
{
	my_bool	check = *static_cast<my_bool*>(var_ptr)
		= *static_cast<const my_bool*>(save);

	/* Make sure we are the only log user */
	mutex_enter(&log_sys->mutex);
	innodb_log_checksums_func_update(check);
	mutex_exit(&log_sys->mutex);
}

static SHOW_VAR innodb_status_variables_export[]= {
	{"Innodb", (char*) &show_innodb_vars, SHOW_FUNC, SHOW_SCOPE_GLOBAL},
	{NullS, NullS, SHOW_LONG, SHOW_SCOPE_GLOBAL}
};

static struct st_mysql_storage_engine innobase_storage_engine=
{ MYSQL_HANDLERTON_INTERFACE_VERSION };

/* plugin options */

static MYSQL_SYSVAR_ENUM(checksum_algorithm, srv_checksum_algorithm,
  PLUGIN_VAR_RQCMDARG,
  "The algorithm InnoDB uses for page checksumming. Possible values are"
  " CRC32 (hardware accelerated if the CPU supports it)"
    " write crc32, allow any of the other checksums to match when reading;"
  " STRICT_CRC32"
    " write crc32, do not allow other algorithms to match when reading;"
  " INNODB"
    " write a software calculated checksum, allow any other checksums"
    " to match when reading;"
  " STRICT_INNODB"
    " write a software calculated checksum, do not allow other algorithms"
    " to match when reading;"
  " NONE"
    " write a constant magic number, do not do any checksum verification"
    " when reading (same as innodb_checksums=OFF);"
  " STRICT_NONE"
    " write a constant magic number, do not allow values other than that"
    " magic number when reading;"
  " Files updated when this option is set to crc32 or strict_crc32 will"
  " not be readable by MySQL versions older than 5.6.3",
  NULL, NULL, SRV_CHECKSUM_ALGORITHM_CRC32,
  &innodb_checksum_algorithm_typelib);

static MYSQL_SYSVAR_BOOL(log_checksums, innodb_log_checksums,
  PLUGIN_VAR_RQCMDARG,
  "Whether to compute and require checksums for InnoDB redo log blocks",
  NULL, innodb_log_checksums_update, TRUE);

static MYSQL_SYSVAR_BOOL(checksums, innobase_use_checksums,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "DEPRECATED. Use innodb_checksum_algorithm=NONE instead of setting"
  " this to OFF."
  " Enable InnoDB checksums validation (enabled by default)."
  " Disable with --skip-innodb-checksums.",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_STR(data_home_dir, innobase_data_home_dir,
  PLUGIN_VAR_READONLY,
  "The common part for InnoDB table spaces.",
  NULL, NULL, NULL);

static MYSQL_SYSVAR_BOOL(doublewrite, innobase_use_doublewrite,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "Enable InnoDB doublewrite buffer (enabled by default)."
  " Disable with --skip-innodb-doublewrite.",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_ULONG(io_capacity, srv_io_capacity,
  PLUGIN_VAR_RQCMDARG,
  "Number of IOPs the server can do. Tunes the background IO rate",
  NULL, innodb_io_capacity_update, 200, 100, ~0UL, 0);

static MYSQL_SYSVAR_ULONG(io_capacity_max, srv_max_io_capacity,
  PLUGIN_VAR_RQCMDARG,
  "Limit to which innodb_io_capacity can be inflated.",
  NULL, innodb_io_capacity_max_update,
  SRV_MAX_IO_CAPACITY_DUMMY_DEFAULT, 100,
  SRV_MAX_IO_CAPACITY_LIMIT, 0);

#ifdef UNIV_DEBUG
static MYSQL_SYSVAR_BOOL(background_drop_list_empty,
  innodb_background_drop_list_empty,
  PLUGIN_VAR_OPCMDARG,
  "Wait for the background drop list to become empty",
  NULL, wait_background_drop_list_empty, FALSE);

static MYSQL_SYSVAR_BOOL(purge_run_now, innodb_purge_run_now,
  PLUGIN_VAR_OPCMDARG,
  "Set purge state to RUN",
  NULL, purge_run_now_set, FALSE);

static MYSQL_SYSVAR_BOOL(purge_stop_now, innodb_purge_stop_now,
  PLUGIN_VAR_OPCMDARG,
  "Set purge state to STOP",
  NULL, purge_stop_now_set, FALSE);

static MYSQL_SYSVAR_BOOL(log_checkpoint_now, innodb_log_checkpoint_now,
  PLUGIN_VAR_OPCMDARG,
  "Force checkpoint now",
  NULL, checkpoint_now_set, FALSE);

static MYSQL_SYSVAR_BOOL(buf_flush_list_now, innodb_buf_flush_list_now,
  PLUGIN_VAR_OPCMDARG,
  "Force dirty page flush now",
  NULL, buf_flush_list_now_set, FALSE);

static MYSQL_SYSVAR_BOOL(track_redo_log_now,
  innodb_track_redo_log_now,
  PLUGIN_VAR_OPCMDARG,
  "Force log tracker to catch up with checkpoint now",
  NULL, track_redo_log_now_set, FALSE);

static MYSQL_SYSVAR_UINT(merge_threshold_set_all_debug,
  innodb_merge_threshold_set_all_debug,
  PLUGIN_VAR_RQCMDARG,
  "Override current MERGE_THRESHOLD setting for all indexes at dictionary"
  " cache by the specified value dynamically, at the time.",
  NULL, innodb_merge_threshold_set_all_debug_update,
  DICT_INDEX_MERGE_THRESHOLD_DEFAULT, 1, 50, 0);
#endif /* UNIV_DEBUG */

static MYSQL_SYSVAR_ULONG(purge_batch_size, srv_purge_batch_size,
  PLUGIN_VAR_OPCMDARG,
  "Number of UNDO log pages to purge in one batch from the history list.",
  NULL, NULL,
  300,			/* Default setting */
  1,			/* Minimum value */
  5000, 0);		/* Maximum value */

static MYSQL_SYSVAR_ULONG(purge_threads, srv_n_purge_threads,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
  "Purge threads can be from 1 to 32. Default is 4.",
  NULL, NULL,
  4,			/* Default setting */
  1,			/* Minimum value */
  SRV_MAX_N_PURGE_THREADS, 0);		/* Maximum value */

static MYSQL_SYSVAR_ULONG(sync_array_size, srv_sync_array_size,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
  "Size of the mutex/lock wait array.",
  NULL, NULL,
  1,			/* Default setting */
  1,			/* Minimum value */
  1024, 0);		/* Maximum value */

static MYSQL_SYSVAR_ULONG(fast_shutdown, innobase_fast_shutdown,
  PLUGIN_VAR_OPCMDARG,
  "Speeds up the shutdown process of the InnoDB storage engine. Possible"
  " values are 0, 1 (faster) or 2 (fastest - crash-like).",
  NULL, NULL, 1, 0, 2, 0);

static MYSQL_SYSVAR_BOOL(file_per_table, srv_file_per_table,
  PLUGIN_VAR_NOCMDARG,
  "Stores each InnoDB table to an .ibd file in the database dir.",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_STR(file_format, innobase_file_format_name,
  PLUGIN_VAR_RQCMDARG,
  "File format to use for new tables in .ibd files.",
  innodb_file_format_name_validate,
  innodb_file_format_name_update, innodb_file_format_default);

/* "innobase_file_format_check" decides whether we would continue
booting the server if the file format stamped on the system
table space exceeds the maximum file format supported
by the server. Can be set during server startup at command
line or configure file, and a read only variable after
server startup */
static MYSQL_SYSVAR_BOOL(file_format_check, innobase_file_format_check,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "Whether to perform system file format check.",
  NULL, NULL, TRUE);

/* If a new file format is introduced, the file format
name needs to be updated accordingly. Please refer to
file_format_name_map[] defined in trx0sys.cc for the next
file format name. */
static MYSQL_SYSVAR_STR(file_format_max, innobase_file_format_max,
  PLUGIN_VAR_OPCMDARG,
  "The highest file format in the tablespace.",
  innodb_file_format_max_validate,
  innodb_file_format_max_update, innodb_file_format_max_default);

static MYSQL_SYSVAR_STR(ft_server_stopword_table, innobase_server_stopword_table,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_MEMALLOC,
  "The user supplied stopword table name.",
  innodb_stopword_table_validate,
  NULL,
  NULL);

static MYSQL_SYSVAR_UINT(flush_log_at_timeout, srv_flush_log_at_timeout,
  PLUGIN_VAR_OPCMDARG,
  "Write and flush logs every (n) second.",
  NULL, NULL, 1, 0, 2700, 0);

/* Changed to the THDVAR */
//static MYSQL_SYSVAR_ULONG(flush_log_at_trx_commit, srv_flush_log_at_trx_commit,
//  PLUGIN_VAR_OPCMDARG,
//  "Set to 0 (write and flush once per second),"
//  " 1 (write and flush at each commit)"
//  " or 2 (write at commit, flush once per second).",
//  NULL, NULL, 1, 0, 2, 0);

static MYSQL_SYSVAR_BOOL(use_global_flush_log_at_trx_commit, srv_use_global_flush_log_at_trx_commit,
  PLUGIN_VAR_NOCMDARG,
  "Use global innodb_flush_log_at_trx_commit value. (default: ON).",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_STR(flush_method, innobase_file_flush_method,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "With which method to flush data.", NULL, NULL, NULL);

static MYSQL_SYSVAR_BOOL(large_prefix, innobase_large_prefix,
  PLUGIN_VAR_NOCMDARG,
  "Support large index prefix length of REC_VERSION_56_MAX_INDEX_COL_LEN (3072) bytes.",
  NULL, innodb_large_prefix_update, TRUE);

static MYSQL_SYSVAR_BOOL(force_load_corrupted, srv_load_corrupted,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "Force InnoDB to load metadata of corrupted table.",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_BOOL(locks_unsafe_for_binlog, innobase_locks_unsafe_for_binlog,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "DEPRECATED. This option may be removed in future releases."
  " Please use READ COMMITTED transaction isolation level instead."
  " Force InnoDB to not use next-key locking, to use only row-level locking.",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_ULONG(show_verbose_locks, srv_show_verbose_locks,
  PLUGIN_VAR_OPCMDARG,
  "Whether to show records locked in SHOW INNODB STATUS.",
  NULL, NULL, 0, 0, 1, 0);

static MYSQL_SYSVAR_ULONG(show_locks_held, srv_show_locks_held,
  PLUGIN_VAR_RQCMDARG,
  "Number of locks held to print for each InnoDB transaction in SHOW INNODB STATUS.",
  NULL, NULL, 10, 0, 1000, 0);

static MYSQL_SYSVAR_STR(log_group_home_dir, srv_log_group_home_dir,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Path to InnoDB log files.", NULL, NULL, NULL);

static MYSQL_SYSVAR_ULONG(page_cleaners, srv_n_page_cleaners,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
  "Page cleaner threads can be from 1 to 64. Default is 4.",
  NULL, NULL, 4, 1, 64, 0);

static MYSQL_SYSVAR_DOUBLE(max_dirty_pages_pct, srv_max_buf_pool_modified_pct,
  PLUGIN_VAR_RQCMDARG,
  "Percentage of dirty pages allowed in bufferpool.",
  NULL, innodb_max_dirty_pages_pct_update, 75.0, 0, 99.999, 0);

static MYSQL_SYSVAR_DOUBLE(max_dirty_pages_pct_lwm,
  srv_max_dirty_pages_pct_lwm,
  PLUGIN_VAR_RQCMDARG,
  "Percentage of dirty pages at which flushing kicks in.",
  NULL, innodb_max_dirty_pages_pct_lwm_update, 0, 0, 99.999, 0);

static MYSQL_SYSVAR_ULONG(adaptive_flushing_lwm,
  srv_adaptive_flushing_lwm,
  PLUGIN_VAR_RQCMDARG,
  "Percentage of log capacity below which no adaptive flushing happens.",
  NULL, NULL, 10, 0, 70, 0);

static MYSQL_SYSVAR_BOOL(adaptive_flushing, srv_adaptive_flushing,
  PLUGIN_VAR_NOCMDARG,
  "Attempt flushing dirty pages to avoid IO bursts at checkpoints.",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_BOOL(flush_sync, srv_flush_sync,
  PLUGIN_VAR_NOCMDARG,
  "Allow IO bursts at the checkpoints ignoring io_capacity setting.",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_ULONG(flushing_avg_loops,
  srv_flushing_avg_loops,
  PLUGIN_VAR_RQCMDARG,
  "Number of iterations over which the background flushing is averaged.",
  NULL, NULL, 30, 1, 1000, 0);

static MYSQL_SYSVAR_ULONG(max_purge_lag, srv_max_purge_lag,
  PLUGIN_VAR_RQCMDARG,
  "Desired maximum length of the purge queue (0 = no limit)",
  NULL, NULL, 0, 0, ~0UL, 0);

static MYSQL_SYSVAR_ULONG(max_purge_lag_delay, srv_max_purge_lag_delay,
   PLUGIN_VAR_RQCMDARG,
   "Maximum delay of user threads in micro-seconds",
   NULL, NULL,
   0L,			/* Default seting */
   0L,			/* Minimum value */
   10000000UL, 0);	/* Maximum value */

static MYSQL_SYSVAR_BOOL(rollback_on_timeout, innobase_rollback_on_timeout,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
  "Roll back the complete transaction on lock wait timeout, for 4.x compatibility (disabled by default)",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_BOOL(status_file, innobase_create_status_file,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_NOSYSVAR,
  "Enable SHOW ENGINE INNODB STATUS output in the innodb_status.<pid> file",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_BOOL(stats_on_metadata, innobase_stats_on_metadata,
  PLUGIN_VAR_OPCMDARG,
  "Enable statistics gathering for metadata commands such as"
  " SHOW TABLE STATUS for tables that use transient statistics (off by default)",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_ULONGLONG(stats_sample_pages, srv_stats_transient_sample_pages,
  PLUGIN_VAR_RQCMDARG,
  "Deprecated, use innodb_stats_transient_sample_pages instead",
  NULL, innodb_stats_sample_pages_update, 8, 1, ~0ULL, 0);

static MYSQL_SYSVAR_ULONGLONG(stats_transient_sample_pages,
  srv_stats_transient_sample_pages,
  PLUGIN_VAR_RQCMDARG,
  "The number of leaf index pages to sample when calculating transient"
  " statistics (if persistent statistics are not used, default 8)",
  NULL, NULL, 8, 1, ~0ULL, 0);

static MYSQL_SYSVAR_BOOL(stats_persistent, srv_stats_persistent,
  PLUGIN_VAR_OPCMDARG,
  "InnoDB persistent statistics enabled for all tables unless overridden"
  " at table level",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_BOOL(stats_auto_recalc, srv_stats_auto_recalc,
  PLUGIN_VAR_OPCMDARG,
  "InnoDB automatic recalculation of persistent statistics enabled for all"
  " tables unless overridden at table level (automatic recalculation is only"
  " done when InnoDB decides that the table has changed too much and needs a"
  " new statistics)",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_ULONGLONG(stats_persistent_sample_pages,
  srv_stats_persistent_sample_pages,
  PLUGIN_VAR_RQCMDARG,
  "The number of leaf index pages to sample when calculating persistent"
  " statistics (by ANALYZE, default 20)",
  NULL, NULL, 20, 1, ~0ULL, 0);

static MYSQL_SYSVAR_BOOL(adaptive_hash_index, btr_search_enabled,
  PLUGIN_VAR_OPCMDARG,
  "Enable InnoDB adaptive hash index (enabled by default). "
  " Disable with --skip-innodb-adaptive-hash-index.",
  NULL, innodb_adaptive_hash_index_update, true);

/** Number of distinct partitions of AHI.
Each partition is protected by its own latch and so we have parts number
of latches protecting complete search system. */
static MYSQL_SYSVAR_ULONG(adaptive_hash_index_parts, btr_ahi_parts,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
  "Number of InnoDB Adapative Hash Index Partitions. (default = 8). ",
  NULL, NULL, 8, 1, 512, 0);

static MYSQL_SYSVAR_ULONG(replication_delay, srv_replication_delay,
  PLUGIN_VAR_RQCMDARG,
  "Replication thread delay (ms) on the slave server if"
  " innodb_thread_concurrency is reached (0 by default)",
  NULL, NULL, 0, 0, ~0UL, 0);

static MYSQL_SYSVAR_UINT(compression_level, page_zip_level,
  PLUGIN_VAR_RQCMDARG,
  "Compression level used for compressed row format.  0 is no compression"
  ", 1 is fastest, 9 is best compression and default is 6.",
  NULL, NULL, DEFAULT_COMPRESSION_LEVEL, 0, 9, 0);

static MYSQL_SYSVAR_BOOL(log_compressed_pages, page_zip_log_pages,
       PLUGIN_VAR_OPCMDARG,
  "Enables/disables the logging of entire compressed page images."
  " InnoDB logs the compressed pages to prevent corruption if"
  " the zlib compression algorithm changes."
  " When turned OFF, InnoDB will assume that the zlib"
  " compression algorithm doesn't change.",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_ULONG(autoextend_increment,
  sys_tablespace_auto_extend_increment,
  PLUGIN_VAR_RQCMDARG,
  "Data file autoextend increment in megabytes",
  NULL, NULL, 64L, 1L, 1000L, 0);

/** Validate the requested buffer pool size.  Also, reserve the necessary
memory needed for buffer pool resize.
@param[in]	thd	thread handle
@param[in]	var	pointer to system variable
@param[out]	save	immediate result for update function
@param[in]	value	incoming string
@return 0 on success, 1 on failure.
*/
static
int
innodb_buffer_pool_size_validate(
	THD*				thd,
	struct st_mysql_sys_var*	var,
	void*				save,
	struct st_mysql_value*		value);

/* If the default value of innodb_buffer_pool_size is increased to be more than
BUF_POOL_SIZE_THRESHOLD (srv/srv0start.cc), then srv_buf_pool_instances_default
can be removed and 8 used instead. The problem with the current setup is that
with 128MiB default buffer pool size and 8 instances by default we would emit
a warning when no options are specified. */
static MYSQL_SYSVAR_LONGLONG(buffer_pool_size, innobase_buffer_pool_size,
  PLUGIN_VAR_RQCMDARG,
  "The size of the memory buffer InnoDB uses to cache data and indexes of its tables.",
  innodb_buffer_pool_size_validate,
  innodb_buffer_pool_size_update,
  static_cast<longlong>(srv_buf_pool_def_size),
  static_cast<longlong>(srv_buf_pool_min_size),
  LLONG_MAX, 1024*1024L);

static MYSQL_SYSVAR_ULONG(buffer_pool_chunk_size, srv_buf_pool_chunk_unit,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Size of a single memory chunk within each buffer pool instance"
  " for resizing buffer pool. Online buffer pool resizing happens"
  " at this granularity. 0 means disable resizing buffer pool.",
  NULL, NULL,
  128 * 1024 * 1024, 1024 * 1024, LONG_MAX, 1024 * 1024);

#if defined UNIV_DEBUG || defined UNIV_PERF_DEBUG
static MYSQL_SYSVAR_ULONG(page_hash_locks, srv_n_page_hash_locks,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
  "Number of rw_locks protecting buffer pool page_hash. Rounded up to the next power of 2",
  NULL, NULL, 16, 1, MAX_PAGE_HASH_LOCKS, 0);

static MYSQL_SYSVAR_ULONG(doublewrite_batch_size, srv_doublewrite_batch_size,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
  "Number of pages reserved in doublewrite buffer for batch flushing",
  NULL, NULL, 120, 1, MAX_DOUBLEWRITE_BATCH_SIZE, 0);

#ifdef UNIV_LINUX

static MYSQL_SYSVAR_ULONG(sched_priority_purge, srv_sched_priority_purge,
  PLUGIN_VAR_RQCMDARG,
  "Nice value for the purge thread scheduling",
  NULL, innodb_sched_priority_purge_update, 19, 0, 39, 0);

static MYSQL_SYSVAR_ULONG(sched_priority_io, srv_sched_priority_io,
  PLUGIN_VAR_RQCMDARG,
  "Nice value for the I/O handler thread scheduling",
  NULL, innodb_sched_priority_io_update, 19, 0, 39, 0);

static MYSQL_SYSVAR_ULONG(sched_priority_master, srv_sched_priority_master,
  PLUGIN_VAR_RQCMDARG,
  "Nice value for the master thread scheduling",
  NULL, innodb_sched_priority_master_update, 19, 0, 39, 0);

static MYSQL_SYSVAR_BOOL(priority_purge, srv_purge_thread_priority,
  PLUGIN_VAR_OPCMDARG,
  "Make purge coordinator and worker threads acquire shared resources with "
  "priority", NULL, NULL, FALSE);

static MYSQL_SYSVAR_BOOL(priority_master, srv_master_thread_priority,
  PLUGIN_VAR_OPCMDARG,
  "Make buffer pool cleaner thread acquire shared resources with priority",
   NULL, NULL, FALSE);

#endif /* UNIV_LINUX */

// TODO: the option is here, but currently a no-op
static MYSQL_SYSVAR_ULONG(cleaner_max_lru_time, srv_cleaner_max_lru_time,
  PLUGIN_VAR_RQCMDARG,
  "The maximum time limit for a single LRU tail flush iteration by the page "
  "cleaner thread in miliseconds",
  NULL, NULL, 1000, 0, ~0UL, 0);

// TODO: the option is here, but currently a no-op
static MYSQL_SYSVAR_ULONG(cleaner_max_flush_time, srv_cleaner_max_flush_time,
  PLUGIN_VAR_RQCMDARG,
  "The maximum time limit for a single flush list flush iteration by the page "
  "cleaner thread in miliseconds",
  NULL, NULL, 1000, 0, ~0UL, 0);

#endif /* defined UNIV_DEBUG || defined UNIV_PERF_DEBUG */

static MYSQL_SYSVAR_ENUM(cleaner_lsn_age_factor,
  srv_cleaner_lsn_age_factor,
  PLUGIN_VAR_OPCMDARG,
  "The formula for LSN age factor for page cleaner adaptive flushing. "
  "LEGACY: Original Oracle MySQL 5.6 formula. "
  "HIGH_CHECKPOINT: (the default) Percona Server 5.6 formula.",
  NULL, NULL, SRV_CLEANER_LSN_AGE_FACTOR_HIGH_CHECKPOINT,
  &innodb_cleaner_lsn_age_factor_typelib);

static MYSQL_SYSVAR_ENUM(empty_free_list_algorithm,
  srv_empty_free_list_algorithm,
  PLUGIN_VAR_OPCMDARG,
  "The algorithm to use for empty free list handling.  Allowed values: "
  "LEGACY: (default) Original Oracle MySQL 5.6 handling with single page flushes; "
  "BACKOFF: Wait until cleaner produces a free page.",
  innodb_srv_empty_free_list_algorithm_validate, NULL,
  SRV_EMPTY_FREE_LIST_BACKOFF,
  &innodb_empty_free_list_algorithm_typelib);

static MYSQL_SYSVAR_ULONG(buffer_pool_instances, srv_buf_pool_instances,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Number of buffer pool instances, set to higher value on high-end machines to increase scalability",
  NULL, NULL, srv_buf_pool_instances_default, 0, MAX_BUFFER_POOLS, 0);

static MYSQL_SYSVAR_STR(buffer_pool_filename, srv_buf_dump_filename,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_MEMALLOC,
  "Filename to/from which to dump/load the InnoDB buffer pool",
  innodb_srv_buf_dump_filename_validate, NULL, SRV_BUF_DUMP_FILENAME_DEFAULT);

static MYSQL_SYSVAR_BOOL(buffer_pool_dump_now, innodb_buffer_pool_dump_now,
  PLUGIN_VAR_RQCMDARG,
  "Trigger an immediate dump of the buffer pool into a file named @@innodb_buffer_pool_filename",
  NULL, buffer_pool_dump_now, FALSE);

static MYSQL_SYSVAR_BOOL(buffer_pool_dump_at_shutdown, srv_buffer_pool_dump_at_shutdown,
  PLUGIN_VAR_RQCMDARG,
  "Dump the buffer pool into a file named @@innodb_buffer_pool_filename",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_ULONG(buffer_pool_dump_pct, srv_buf_pool_dump_pct,
  PLUGIN_VAR_RQCMDARG,
  "Dump only the hottest N% of each buffer pool, defaults to 25",
  NULL, NULL, 25, 1, 100, 0);

#ifdef UNIV_DEBUG
static MYSQL_SYSVAR_STR(buffer_pool_evict, srv_buffer_pool_evict,
  PLUGIN_VAR_RQCMDARG,
  "Evict pages from the buffer pool",
  NULL, innodb_buffer_pool_evict_update, "");
#endif /* UNIV_DEBUG */

static MYSQL_SYSVAR_BOOL(buffer_pool_load_now, innodb_buffer_pool_load_now,
  PLUGIN_VAR_RQCMDARG,
  "Trigger an immediate load of the buffer pool from a file named @@innodb_buffer_pool_filename",
  NULL, buffer_pool_load_now, FALSE);

static MYSQL_SYSVAR_BOOL(buffer_pool_load_abort, innodb_buffer_pool_load_abort,
  PLUGIN_VAR_RQCMDARG,
  "Abort a currently running load of the buffer pool",
  NULL, buffer_pool_load_abort, FALSE);

/* there is no point in changing this during runtime, thus readonly */
static MYSQL_SYSVAR_BOOL(buffer_pool_load_at_startup, srv_buffer_pool_load_at_startup,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Load the buffer pool from a file named @@innodb_buffer_pool_filename",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_ULONG(lru_scan_depth, srv_LRU_scan_depth,
  PLUGIN_VAR_RQCMDARG,
  "How deep to scan LRU to keep it clean",
  NULL, NULL, 1024, 100, ~0UL, 0);

static MYSQL_SYSVAR_ULONG(flush_neighbors, srv_flush_neighbors,
  PLUGIN_VAR_OPCMDARG,
  "Set to 0 (don't flush neighbors from buffer pool),"
  " 1 (flush contiguous neighbors from buffer pool)"
  " or 2 (flush neighbors from buffer pool),"
  " when flushing a block",
  NULL, NULL, 1, 0, 2, 0);

static MYSQL_SYSVAR_ULONG(commit_concurrency, innobase_commit_concurrency,
  PLUGIN_VAR_RQCMDARG,
  "Helps in performance tuning in heavily concurrent environments.",
  innobase_commit_concurrency_validate, NULL, 0, 0, 1000, 0);

static MYSQL_SYSVAR_ULONG(concurrency_tickets, srv_n_free_tickets_to_enter,
  PLUGIN_VAR_RQCMDARG,
  "Number of times a thread is allowed to enter InnoDB within the same SQL query after it has once got the ticket",
  NULL, NULL, 5000L, 1L, ~0UL, 0);

static MYSQL_SYSVAR_LONG(kill_idle_transaction, srv_kill_idle_transaction,
  PLUGIN_VAR_RQCMDARG,
  "If non-zero value, the idle session with transaction which is idle over "
  "the value in seconds is killed by InnoDB.",
  NULL, NULL, 0, 0, LONG_MAX, 0);

static MYSQL_SYSVAR_LONG(fill_factor, innobase_fill_factor,
  PLUGIN_VAR_RQCMDARG,
  "Percentage of B-tree page filled during bulk insert",
  NULL, NULL, 100, 10, 100, 0);

static MYSQL_SYSVAR_BOOL(ft_enable_diag_print, fts_enable_diag_print,
  PLUGIN_VAR_OPCMDARG,
  "Whether to enable additional FTS diagnostic printout ",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_BOOL(disable_sort_file_cache, srv_disable_sort_file_cache,
  PLUGIN_VAR_OPCMDARG,
  "Whether to disable OS system file cache for sort I/O",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_STR(ft_aux_table, fts_internal_tbl_name,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_MEMALLOC,
  "FTS internal auxiliary table to be checked",
  innodb_internal_table_validate,
  NULL, NULL);

static MYSQL_SYSVAR_ULONG(ft_cache_size, fts_max_cache_size,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "InnoDB Fulltext search cache size in bytes",
  NULL, NULL, 8000000, 1600000, 80000000, 0);

static MYSQL_SYSVAR_ULONG(ft_total_cache_size, fts_max_total_cache_size,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Total memory allocated for InnoDB Fulltext Search cache",
  NULL, NULL, 640000000, 32000000, 1600000000, 0);

static MYSQL_SYSVAR_ULONG(ft_result_cache_limit, fts_result_cache_limit,
  PLUGIN_VAR_RQCMDARG,
  "InnoDB Fulltext search query result cache limit in bytes",
  NULL, NULL, 2000000000L, 1000000L, 4294967295UL, 0);

static MYSQL_SYSVAR_ULONG(ft_min_token_size, fts_min_token_size,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "InnoDB Fulltext search minimum token size in characters",
  NULL, NULL, 3, 0, 16, 0);

static MYSQL_SYSVAR_ULONG(ft_max_token_size, fts_max_token_size,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "InnoDB Fulltext search maximum token size in characters",
  NULL, NULL, FTS_MAX_WORD_LEN_IN_CHAR, 10, FTS_MAX_WORD_LEN_IN_CHAR, 0);

static MYSQL_SYSVAR_ULONG(ft_num_word_optimize, fts_num_word_optimize,
  PLUGIN_VAR_OPCMDARG,
  "InnoDB Fulltext search number of words to optimize for each optimize table call ",
  NULL, NULL, 2000, 1000, 10000, 0);

static MYSQL_SYSVAR_ULONG(ft_sort_pll_degree, fts_sort_pll_degree,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "InnoDB Fulltext search parallel sort degree, will round up to nearest power of 2 number",
  NULL, NULL, 2, 1, 16, 0);

static MYSQL_SYSVAR_ULONG(sort_buffer_size, srv_sort_buf_size,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Memory buffer size for index creation",
  NULL, NULL, 1048576, 65536, 64<<20, 0);

static MYSQL_SYSVAR_ULONGLONG(online_alter_log_max_size, srv_online_max_size,
  PLUGIN_VAR_RQCMDARG,
  "Maximum modification log file size for online index creation",
  NULL, NULL, 128<<20, 65536, ~0ULL, 0);

static MYSQL_SYSVAR_BOOL(optimize_fulltext_only, innodb_optimize_fulltext_only,
  PLUGIN_VAR_NOCMDARG,
  "Only optimize the Fulltext index of the table",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_ULONG(read_io_threads, innobase_read_io_threads,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Number of background read I/O threads in InnoDB.",
  NULL, NULL, 4, 1, 64, 0);

static MYSQL_SYSVAR_ULONG(write_io_threads, innobase_write_io_threads,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Number of background write I/O threads in InnoDB.",
  NULL, NULL, 4, 1, 64, 0);

static MYSQL_SYSVAR_ULONG(force_recovery, srv_force_recovery,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Helps to save your data in case the disk image of the database becomes corrupt.",
  NULL, NULL, 0, 0, 6, 0);

#ifndef DBUG_OFF
static MYSQL_SYSVAR_ULONG(force_recovery_crash, srv_force_recovery_crash,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Kills the server during crash recovery.",
  NULL, NULL, 0, 0, 100, 0);
#endif /* !DBUG_OFF */

static MYSQL_SYSVAR_ULONG(page_size, srv_page_size,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
  "Page size to use for all InnoDB tablespaces.",
  NULL, NULL, UNIV_PAGE_SIZE_DEF,
  UNIV_PAGE_SIZE_MIN, UNIV_PAGE_SIZE_MAX, 0);

static MYSQL_SYSVAR_LONG(log_buffer_size, innobase_log_buffer_size,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "The size of the buffer which InnoDB uses to write log to the log files on disk.",
  NULL, NULL, 16*1024*1024L, 256*1024L, LONG_MAX, 1024);

static MYSQL_SYSVAR_LONGLONG(log_file_size, innobase_log_file_size,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Size of each log file in a log group.",
  NULL, NULL, 48*1024*1024L, 4*1024*1024L, LLONG_MAX, 1024*1024L);

static MYSQL_SYSVAR_ULONG(log_files_in_group, srv_n_log_files,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Number of log files in the log group. InnoDB writes to the files in a circular fashion.",
  NULL, NULL, 2, 2, SRV_N_LOG_FILES_MAX, 0);

static MYSQL_SYSVAR_ULONG(log_write_ahead_size, srv_log_write_ahead_size,
  PLUGIN_VAR_RQCMDARG,
  "Redo log write ahead unit size to avoid read-on-write,"
  " it should match the OS cache block IO size",
  NULL, innodb_log_write_ahead_size_update,
  8*1024L, OS_FILE_LOG_BLOCK_SIZE, UNIV_PAGE_SIZE_DEF, OS_FILE_LOG_BLOCK_SIZE);

static MYSQL_SYSVAR_UINT(old_blocks_pct, innobase_old_blocks_pct,
  PLUGIN_VAR_RQCMDARG,
  "Percentage of the buffer pool to reserve for 'old' blocks.",
  NULL, innodb_old_blocks_pct_update, 100 * 3 / 8, 5, 95, 0);

static MYSQL_SYSVAR_UINT(old_blocks_time, buf_LRU_old_threshold_ms,
  PLUGIN_VAR_RQCMDARG,
  "Move blocks to the 'new' end of the buffer pool if the first access"
  " was at least this many milliseconds ago."
  " The timeout is disabled if 0.",
  NULL, NULL, 1000, 0, UINT_MAX32, 0);

static MYSQL_SYSVAR_LONG(open_files, innobase_open_files,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "How many files at the maximum InnoDB keeps open at the same time.",
  NULL, NULL, 0L, 0L, LONG_MAX, 0);

static MYSQL_SYSVAR_ULONG(sync_spin_loops, srv_n_spin_wait_rounds,
  PLUGIN_VAR_RQCMDARG,
  "Count of spin-loop rounds in InnoDB mutexes (30 by default)",
  NULL, NULL, 30L, 0L, ~0UL, 0);

static MYSQL_SYSVAR_ULONG(spin_wait_delay, srv_spin_wait_delay,
  PLUGIN_VAR_OPCMDARG,
  "Maximum delay between polling for a spin lock (6 by default)",
  NULL, NULL, 6L, 0L, ~0UL, 0);

static MYSQL_SYSVAR_ULONG(thread_concurrency, srv_thread_concurrency,
  PLUGIN_VAR_RQCMDARG,
  "Helps in performance tuning in heavily concurrent environments. Sets the maximum number of threads allowed inside InnoDB. Value 0 will disable the thread throttling.",
  NULL, NULL, 0, 0, 1000, 0);

static MYSQL_SYSVAR_ULONG(
  adaptive_max_sleep_delay, srv_adaptive_max_sleep_delay,
  PLUGIN_VAR_RQCMDARG,
  "The upper limit of the sleep delay in usec. Value of 0 disables it.",
  NULL, NULL,
  150000,			/* Default setting */
  0,				/* Minimum value */
  1000000, 0);			/* Maximum value */

static MYSQL_SYSVAR_ULONG(thread_sleep_delay, srv_thread_sleep_delay,
  PLUGIN_VAR_RQCMDARG,
  "Time of innodb thread sleeping before joining InnoDB queue (usec)."
  " Value 0 disable a sleep",
  NULL, NULL,
  10000L,
  0L,
  1000000L, 0);

static MYSQL_SYSVAR_STR(data_file_path, innobase_data_file_path,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Path to individual files and their sizes.",
  NULL, NULL, NULL);

static MYSQL_SYSVAR_STR(temp_data_file_path, innobase_temp_data_file_path,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Path to files and their sizes making temp-tablespace.",
  NULL, NULL, NULL);

static MYSQL_SYSVAR_STR(undo_directory, srv_undo_dir,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Directory where undo tablespace files live, this path can be absolute.",
  NULL, NULL, NULL);

static MYSQL_SYSVAR_ULONG(undo_tablespaces, srv_undo_tablespaces,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Number of undo tablespaces to use. ",
  NULL, NULL,
  0L,			/* Default seting */
  0L,			/* Minimum value */
  95L, 0);		/* Maximum value */

static MYSQL_SYSVAR_ULONG(undo_logs, srv_undo_logs,
  PLUGIN_VAR_OPCMDARG,
  "Number of undo logs to use.",
  NULL, NULL,
  TRX_SYS_N_RSEGS,	/* Default setting */
  1,			/* Minimum value */
  TRX_SYS_N_RSEGS, 0);	/* Maximum value */

static MYSQL_SYSVAR_ULONGLONG(max_undo_log_size, srv_max_undo_log_size,
  PLUGIN_VAR_OPCMDARG,
  "Maximum size of UNDO tablespace in MB (If UNDO tablespace grows"
  " beyond this size it will be truncated in due course). ",
  NULL, NULL,
  1024 * 1024 * 1024L,
  10 * 1024 * 1024L,
  ~0ULL, 0);

static MYSQL_SYSVAR_ULONG(purge_rseg_truncate_frequency,
  srv_purge_rseg_truncate_frequency,
  PLUGIN_VAR_OPCMDARG,
  "Dictates rate at which UNDO records are purged. Value N means"
  " purge rollback segment(s) on every Nth iteration of purge invocation",
  NULL, NULL, 128, 1, 128, 0);

static MYSQL_SYSVAR_BOOL(undo_log_truncate, srv_undo_log_truncate,
  PLUGIN_VAR_OPCMDARG,
  "Enable or Disable Truncate of UNDO tablespace.",
  NULL, NULL, FALSE);

/* Alias for innodb_undo_logs, this config variable is deprecated. */
static MYSQL_SYSVAR_ULONG(rollback_segments, srv_undo_logs,
  PLUGIN_VAR_OPCMDARG,
  "Number of undo logs to use (deprecated).",
  NULL, NULL,
  TRX_SYS_N_RSEGS,	/* Default setting */
  1,			/* Minimum value */
  TRX_SYS_N_RSEGS, 0);	/* Maximum value */

static MYSQL_SYSVAR_LONG(autoinc_lock_mode, innobase_autoinc_lock_mode,
  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "The AUTOINC lock modes supported by InnoDB:"
  " 0 => Old style AUTOINC locking (for backward compatibility);"
  " 1 => New style AUTOINC locking;"
  " 2 => No AUTOINC locking (unsafe for SBR)",
  NULL, NULL,
  AUTOINC_NEW_STYLE_LOCKING,	/* Default setting */
  AUTOINC_OLD_STYLE_LOCKING,	/* Minimum value */
  AUTOINC_NO_LOCKING, 0);	/* Maximum value */

static MYSQL_SYSVAR_STR(version, innodb_version_str,
  PLUGIN_VAR_NOCMDOPT | PLUGIN_VAR_READONLY,
  "Percona-InnoDB-plugin version", NULL, NULL, INNODB_VERSION_STR);

static MYSQL_SYSVAR_BOOL(use_native_aio, srv_use_native_aio,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "Use native AIO if supported on this platform.",
  NULL, NULL, TRUE);

#if defined(HAVE_LIBNUMA) && defined(WITH_NUMA)
static MYSQL_SYSVAR_BOOL(numa_interleave, srv_numa_interleave,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "Use NUMA interleave memory policy to allocate InnoDB buffer pool.",
  NULL, NULL, FALSE);
#endif /* HAVE_LIBNUMA && WITH_NUMA */

static MYSQL_SYSVAR_BOOL(api_enable_binlog, ib_binlog_enabled,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "Enable binlog for applications direct access InnoDB through InnoDB APIs",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_BOOL(api_enable_mdl, ib_mdl_enabled,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "Enable MDL for applications direct access InnoDB through InnoDB APIs",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_BOOL(api_disable_rowlock, ib_disable_row_lock,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
  "Disable row lock when direct access InnoDB through InnoDB APIs",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_ULONG(api_trx_level, ib_trx_level_setting,
  PLUGIN_VAR_OPCMDARG,
  "InnoDB API transaction isolation level",
  NULL, NULL,
  0,		/* Default setting */
  0,		/* Minimum value */
  3, 0);	/* Maximum value */

static MYSQL_SYSVAR_ULONG(api_bk_commit_interval, ib_bk_commit_interval,
  PLUGIN_VAR_OPCMDARG,
  "Background commit interval in seconds",
  NULL, NULL,
  5,		/* Default setting */
  1,		/* Minimum value */
  1024 * 1024 * 1024, 0);	/* Maximum value */

static MYSQL_SYSVAR_STR(change_buffering, innobase_change_buffering,
  PLUGIN_VAR_RQCMDARG,
  "Buffer changes to reduce random access:"
  " OFF, ON, inserting, deleting, changing, or purging.",
  innodb_change_buffering_validate,
  innodb_change_buffering_update, "all");

static MYSQL_SYSVAR_UINT(change_buffer_max_size,
  srv_change_buffer_max_size,
  PLUGIN_VAR_RQCMDARG,
  "Maximum on-disk size of change buffer in terms of percentage"
  " of the buffer pool.",
  NULL, innodb_change_buffer_max_size_update,
  CHANGE_BUFFER_DEFAULT_SIZE, 0, 50, 0);

static MYSQL_SYSVAR_ENUM(stats_method, srv_innodb_stats_method,
   PLUGIN_VAR_RQCMDARG,
  "Specifies how InnoDB index statistics collection code should"
  " treat NULLs. Possible values are NULLS_EQUAL (default),"
  " NULLS_UNEQUAL and NULLS_IGNORED",
   NULL, NULL, SRV_STATS_NULLS_EQUAL, &innodb_stats_method_typelib);

static MYSQL_SYSVAR_BOOL(track_changed_pages, srv_track_changed_pages,
  PLUGIN_VAR_NOCMDARG
#ifndef UNIV_DEBUG
  /* Make this variable dynamic for debug builds to
  provide a testcase sync facility */
  | PLUGIN_VAR_READONLY
#endif
  ,
  "Track the redo log for changed pages and output a changed page bitmap",
#ifdef UNIV_DEBUG
  innodb_track_changed_pages_validate,
#else
  NULL,
#endif
  NULL, FALSE);

static MYSQL_SYSVAR_ULONGLONG(max_bitmap_file_size, srv_max_bitmap_file_size,
    PLUGIN_VAR_RQCMDARG,
    "The maximum size of changed page bitmap files",
    NULL, NULL, 100*1024*1024ULL, 4096ULL, ~0ULL, 0);

static MYSQL_SYSVAR_ULONGLONG(max_changed_pages, srv_max_changed_pages,
  PLUGIN_VAR_RQCMDARG,
  "The maximum number of rows for "
  "INFORMATION_SCHEMA.INNODB_CHANGED_PAGES table, "
  "0 - unlimited",
  NULL, NULL, 1000000, 0, ~0ULL, 0);

#if defined UNIV_DEBUG || defined UNIV_IBUF_DEBUG
static MYSQL_SYSVAR_UINT(change_buffering_debug, ibuf_debug,
  PLUGIN_VAR_RQCMDARG,
  "Debug flags for InnoDB change buffering (0=none, 2=crash at merge)",
  NULL, NULL, 0, 0, 2, 0);

static MYSQL_SYSVAR_BOOL(disable_background_merge,
  srv_ibuf_disable_background_merge,
  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_RQCMDARG,
  "Disable change buffering merges by the master thread",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_ENUM(compress_debug, srv_debug_compress,
  PLUGIN_VAR_RQCMDARG,
  "Compress all tables, without specifying the COMRPESS table attribute",
  NULL, NULL, Compression::NONE, &innodb_debug_compress_typelib);
#endif /* UNIV_DEBUG || UNIV_IBUF_DEBUG */

static MYSQL_SYSVAR_BOOL(random_read_ahead, srv_random_read_ahead,
  PLUGIN_VAR_NOCMDARG,
  "Whether to use read ahead for random access within an extent.",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_ULONG(read_ahead_threshold, srv_read_ahead_threshold,
  PLUGIN_VAR_RQCMDARG,
  "Number of pages that must be accessed sequentially for InnoDB to"
  " trigger a readahead.",
  NULL, NULL, 56, 0, 64, 0);

static MYSQL_SYSVAR_STR(monitor_enable, innobase_enable_monitor_counter,
  PLUGIN_VAR_RQCMDARG,
  "Turn on a monitor counter",
  innodb_monitor_validate,
  innodb_enable_monitor_update, NULL);

static MYSQL_SYSVAR_STR(monitor_disable, innobase_disable_monitor_counter,
  PLUGIN_VAR_RQCMDARG,
  "Turn off a monitor counter",
  innodb_monitor_validate,
  innodb_disable_monitor_update, NULL);

static MYSQL_SYSVAR_STR(monitor_reset, innobase_reset_monitor_counter,
  PLUGIN_VAR_RQCMDARG,
  "Reset a monitor counter",
  innodb_monitor_validate,
  innodb_reset_monitor_update, NULL);

static MYSQL_SYSVAR_STR(monitor_reset_all, innobase_reset_all_monitor_counter,
  PLUGIN_VAR_RQCMDARG,
  "Reset all values for a monitor counter",
  innodb_monitor_validate,
  innodb_reset_all_monitor_update, NULL);

static MYSQL_SYSVAR_BOOL(status_output, srv_print_innodb_monitor,
  PLUGIN_VAR_OPCMDARG, "Enable InnoDB monitor output to the error log.",
  NULL, innodb_status_output_update, FALSE);

static MYSQL_SYSVAR_BOOL(status_output_locks, srv_print_innodb_lock_monitor,
  PLUGIN_VAR_OPCMDARG, "Enable InnoDB lock monitor output to the error log."
  " Requires innodb_status_output=ON.",
  NULL, innodb_status_output_update, FALSE);

static MYSQL_SYSVAR_BOOL(print_all_deadlocks, srv_print_all_deadlocks,
  PLUGIN_VAR_OPCMDARG,
  "Print all deadlocks to MySQL error log (off by default)",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_ULONG(compression_failure_threshold_pct,
  zip_failure_threshold_pct, PLUGIN_VAR_OPCMDARG,
  "If the compression failure rate of a table is greater than this number"
  " more padding is added to the pages to reduce the failures. A value of"
  " zero implies no padding",
  NULL, NULL, 5, 0, 100, 0);

static MYSQL_SYSVAR_ULONG(compression_pad_pct_max,
  zip_pad_max, PLUGIN_VAR_OPCMDARG,
  "Percentage of empty space on a data page that can be reserved"
  " to make the page compressible.",
  NULL, NULL, 50, 0, 75, 0);

static MYSQL_SYSVAR_BOOL(read_only, srv_read_only_mode,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
  "Start InnoDB in read only mode (off by default)",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_BOOL(cmp_per_index_enabled, srv_cmp_per_index_enabled,
  PLUGIN_VAR_OPCMDARG,
  "Enable INFORMATION_SCHEMA.innodb_cmp_per_index,"
  " may have negative impact on performance (off by default)",
  NULL, innodb_cmp_per_index_update, FALSE);

static MYSQL_SYSVAR_ENUM(default_row_format, innodb_default_row_format,
  PLUGIN_VAR_RQCMDARG,
  "The default ROW FORMAT for all innodb tables created without explicit"
  " ROW_FORMAT. Possible values are REDUNDANT, COMPACT, and DYNAMIC."
  " The ROW_FORMAT value COMPRESSED is not allowed",
  NULL, NULL, DEFAULT_ROW_FORMAT_DYNAMIC,
  &innodb_default_row_format_typelib);

#ifdef UNIV_DEBUG
static MYSQL_SYSVAR_UINT(trx_rseg_n_slots_debug, trx_rseg_n_slots_debug,
  PLUGIN_VAR_RQCMDARG,
  "Debug flags for InnoDB to limit TRX_RSEG_N_SLOTS for trx_rsegf_undo_find_free()",
  NULL, NULL, 0, 0, 1024, 0);

static MYSQL_SYSVAR_UINT(limit_optimistic_insert_debug,
  btr_cur_limit_optimistic_insert_debug, PLUGIN_VAR_RQCMDARG,
  "Artificially limit the number of records per B-tree page (0=unlimited).",
  NULL, NULL, 0, 0, UINT_MAX32, 0);

static MYSQL_SYSVAR_BOOL(trx_purge_view_update_only_debug,
  srv_purge_view_update_only_debug, PLUGIN_VAR_NOCMDARG,
  "Pause actual purging any delete-marked records, but merely update the purge view."
  " It is to create artificially the situation the purge view have been updated"
  " but the each purges were not done yet.",
  NULL, NULL, FALSE);

static MYSQL_SYSVAR_ULONG(fil_make_page_dirty_debug,
  srv_fil_make_page_dirty_debug, PLUGIN_VAR_OPCMDARG,
  "Make the first page of the given tablespace dirty.",
  NULL, innodb_make_page_dirty, 0, 0, UINT_MAX32, 0);

static MYSQL_SYSVAR_ULONG(saved_page_number_debug,
  srv_saved_page_number_debug, PLUGIN_VAR_OPCMDARG,
  "An InnoDB page number.",
  NULL, innodb_save_page_no, 0, 0, UINT_MAX32, 0);

static MYSQL_SYSVAR_BOOL(disable_resize_buffer_pool_debug,
  buf_disable_resize_buffer_pool_debug, PLUGIN_VAR_NOCMDARG,
  "Disable resizing buffer pool to make assertion code not expensive.",
  NULL, NULL, TRUE);

static MYSQL_SYSVAR_BOOL(page_cleaner_disabled_debug,
  innodb_page_cleaner_disabled_debug,
  PLUGIN_VAR_OPCMDARG,
  "Disable page cleaner",
  NULL, buf_flush_page_cleaner_disabled_debug_update, FALSE);

static MYSQL_SYSVAR_BOOL(dict_stats_disabled_debug,
  innodb_dict_stats_disabled_debug,
  PLUGIN_VAR_OPCMDARG,
  "Disable dict_stats thread",
  NULL, dict_stats_disabled_debug_update, FALSE);

static MYSQL_SYSVAR_BOOL(master_thread_disabled_debug,
  srv_master_thread_disabled_debug,
  PLUGIN_VAR_OPCMDARG,
  "Disable master thread",
  NULL, srv_master_thread_disabled_debug_update, FALSE);

static MYSQL_SYSVAR_BOOL(sync_debug, srv_sync_debug,
  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
  "Enable the sync debug checks",
  NULL, NULL, FALSE);
#endif /* UNIV_DEBUG */

const char *corrupt_table_action_names[]=
{
  "assert", /* 0 */
  "warn", /* 1 */
  "salvage", /* 2 */
  NullS
};
TYPELIB corrupt_table_action_typelib=
{
  array_elements(corrupt_table_action_names) - 1, "corrupt_table_action_typelib",
  corrupt_table_action_names, NULL
};
static	MYSQL_SYSVAR_ENUM(corrupt_table_action, srv_pass_corrupt_table,
  PLUGIN_VAR_RQCMDARG,
  "Warn corruptions of user tables as 'corrupt table' instead of not crashing itself, "
  "when used with file_per_table. "
  "All file io for the datafile after detected as corrupt are disabled, "
  "except for the deletion.",
  NULL, NULL, 0, &corrupt_table_action_typelib);

static MYSQL_SYSVAR_STR(parallel_doublewrite_path,
  srv_parallel_doublewrite_path, PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
  "Path to the parallel doublewrite file. If a relative path or a filename "
  "only is given, it's relative to the server data directory.",
  NULL, NULL, SRV_PARALLEL_DOUBLEWRITE_PATH_DEFAULT);

static struct st_mysql_sys_var* innobase_system_variables[]= {
  MYSQL_SYSVAR(api_trx_level),
  MYSQL_SYSVAR(api_bk_commit_interval),
  MYSQL_SYSVAR(autoextend_increment),
  MYSQL_SYSVAR(buffer_pool_size),
  MYSQL_SYSVAR(buffer_pool_chunk_size),
  MYSQL_SYSVAR(buffer_pool_instances),
  MYSQL_SYSVAR(buffer_pool_filename),
  MYSQL_SYSVAR(buffer_pool_dump_now),
  MYSQL_SYSVAR(buffer_pool_dump_at_shutdown),
  MYSQL_SYSVAR(buffer_pool_dump_pct),
#ifdef UNIV_DEBUG
  MYSQL_SYSVAR(buffer_pool_evict),
#endif /* UNIV_DEBUG */
  MYSQL_SYSVAR(buffer_pool_load_now),
  MYSQL_SYSVAR(buffer_pool_load_abort),
  MYSQL_SYSVAR(buffer_pool_load_at_startup),
  MYSQL_SYSVAR(lru_scan_depth),
  MYSQL_SYSVAR(flush_neighbors),
  MYSQL_SYSVAR(checksum_algorithm),
  MYSQL_SYSVAR(log_checksums),
  MYSQL_SYSVAR(checksums),
  MYSQL_SYSVAR(commit_concurrency),
  MYSQL_SYSVAR(concurrency_tickets),
  MYSQL_SYSVAR(compression_level),
  MYSQL_SYSVAR(kill_idle_transaction),
  MYSQL_SYSVAR(data_file_path),
  MYSQL_SYSVAR(temp_data_file_path),
  MYSQL_SYSVAR(data_home_dir),
  MYSQL_SYSVAR(doublewrite),
  MYSQL_SYSVAR(api_enable_binlog),
  MYSQL_SYSVAR(api_enable_mdl),
  MYSQL_SYSVAR(api_disable_rowlock),
  MYSQL_SYSVAR(fast_shutdown),
  MYSQL_SYSVAR(read_io_threads),
  MYSQL_SYSVAR(write_io_threads),
  MYSQL_SYSVAR(file_per_table),
  MYSQL_SYSVAR(file_format),
  MYSQL_SYSVAR(file_format_check),
  MYSQL_SYSVAR(file_format_max),
  MYSQL_SYSVAR(flush_log_at_timeout),
  MYSQL_SYSVAR(flush_log_at_trx_commit),
  MYSQL_SYSVAR(use_global_flush_log_at_trx_commit),
  MYSQL_SYSVAR(flush_method),
  MYSQL_SYSVAR(force_recovery),
#ifndef DBUG_OFF
  MYSQL_SYSVAR(force_recovery_crash),
#endif /* !DBUG_OFF */
  MYSQL_SYSVAR(fill_factor),
  MYSQL_SYSVAR(ft_cache_size),
  MYSQL_SYSVAR(ft_total_cache_size),
  MYSQL_SYSVAR(ft_result_cache_limit),
  MYSQL_SYSVAR(ft_enable_stopword),
  MYSQL_SYSVAR(ft_max_token_size),
  MYSQL_SYSVAR(ft_min_token_size),
  MYSQL_SYSVAR(ft_num_word_optimize),
  MYSQL_SYSVAR(ft_sort_pll_degree),
  MYSQL_SYSVAR(large_prefix),
  MYSQL_SYSVAR(force_load_corrupted),
  MYSQL_SYSVAR(locks_unsafe_for_binlog),
  MYSQL_SYSVAR(lock_wait_timeout),
  MYSQL_SYSVAR(page_size),
  MYSQL_SYSVAR(log_buffer_size),
  MYSQL_SYSVAR(log_file_size),
  MYSQL_SYSVAR(log_files_in_group),
  MYSQL_SYSVAR(log_write_ahead_size),
  MYSQL_SYSVAR(log_group_home_dir),
  MYSQL_SYSVAR(log_compressed_pages),
  MYSQL_SYSVAR(max_dirty_pages_pct),
  MYSQL_SYSVAR(max_dirty_pages_pct_lwm),
  MYSQL_SYSVAR(adaptive_flushing_lwm),
  MYSQL_SYSVAR(adaptive_flushing),
  MYSQL_SYSVAR(flush_sync),
  MYSQL_SYSVAR(flushing_avg_loops),
  MYSQL_SYSVAR(max_purge_lag),
  MYSQL_SYSVAR(max_purge_lag_delay),
  MYSQL_SYSVAR(old_blocks_pct),
  MYSQL_SYSVAR(old_blocks_time),
  MYSQL_SYSVAR(open_files),
  MYSQL_SYSVAR(optimize_fulltext_only),
  MYSQL_SYSVAR(rollback_on_timeout),
  MYSQL_SYSVAR(ft_aux_table),
  MYSQL_SYSVAR(ft_enable_diag_print),
  MYSQL_SYSVAR(ft_server_stopword_table),
  MYSQL_SYSVAR(ft_user_stopword_table),
  MYSQL_SYSVAR(disable_sort_file_cache),
  MYSQL_SYSVAR(stats_on_metadata),
  MYSQL_SYSVAR(stats_sample_pages),
  MYSQL_SYSVAR(stats_transient_sample_pages),
  MYSQL_SYSVAR(stats_persistent),
  MYSQL_SYSVAR(stats_persistent_sample_pages),
  MYSQL_SYSVAR(stats_auto_recalc),
  MYSQL_SYSVAR(adaptive_hash_index),
  MYSQL_SYSVAR(adaptive_hash_index_parts),
  MYSQL_SYSVAR(stats_method),
  MYSQL_SYSVAR(replication_delay),
  MYSQL_SYSVAR(status_file),
  MYSQL_SYSVAR(strict_mode),
  MYSQL_SYSVAR(support_xa),
  MYSQL_SYSVAR(sort_buffer_size),
  MYSQL_SYSVAR(online_alter_log_max_size),
  MYSQL_SYSVAR(sync_spin_loops),
  MYSQL_SYSVAR(spin_wait_delay),
  MYSQL_SYSVAR(table_locks),
  MYSQL_SYSVAR(thread_concurrency),
  MYSQL_SYSVAR(adaptive_max_sleep_delay),
  MYSQL_SYSVAR(thread_sleep_delay),
  MYSQL_SYSVAR(tmpdir),
  MYSQL_SYSVAR(autoinc_lock_mode),
  MYSQL_SYSVAR(show_verbose_locks),
  MYSQL_SYSVAR(show_locks_held),
  MYSQL_SYSVAR(version),
  MYSQL_SYSVAR(use_native_aio),
#if defined(HAVE_LIBNUMA) && defined(WITH_NUMA)
  MYSQL_SYSVAR(numa_interleave),
#endif /* HAVE_LIBNUMA && WITH_NUMA */
  MYSQL_SYSVAR(change_buffering),
  MYSQL_SYSVAR(change_buffer_max_size),
  MYSQL_SYSVAR(track_changed_pages),
  MYSQL_SYSVAR(max_bitmap_file_size),
  MYSQL_SYSVAR(max_changed_pages),
#if defined UNIV_DEBUG || defined UNIV_IBUF_DEBUG
  MYSQL_SYSVAR(change_buffering_debug),
  MYSQL_SYSVAR(disable_background_merge),
#endif /* UNIV_DEBUG || UNIV_IBUF_DEBUG */
  MYSQL_SYSVAR(random_read_ahead),
  MYSQL_SYSVAR(read_ahead_threshold),
  MYSQL_SYSVAR(read_only),
  MYSQL_SYSVAR(io_capacity),
  MYSQL_SYSVAR(io_capacity_max),
  MYSQL_SYSVAR(page_cleaners),
  MYSQL_SYSVAR(monitor_enable),
  MYSQL_SYSVAR(monitor_disable),
  MYSQL_SYSVAR(monitor_reset),
  MYSQL_SYSVAR(monitor_reset_all),
  MYSQL_SYSVAR(purge_threads),
  MYSQL_SYSVAR(purge_batch_size),
#ifdef UNIV_DEBUG
  MYSQL_SYSVAR(background_drop_list_empty),
  MYSQL_SYSVAR(purge_run_now),
  MYSQL_SYSVAR(purge_stop_now),
  MYSQL_SYSVAR(log_checkpoint_now),
  MYSQL_SYSVAR(buf_flush_list_now),
  MYSQL_SYSVAR(track_redo_log_now),
  MYSQL_SYSVAR(merge_threshold_set_all_debug),
#endif /* UNIV_DEBUG */
#if defined UNIV_DEBUG || defined UNIV_PERF_DEBUG
  MYSQL_SYSVAR(page_hash_locks),
  MYSQL_SYSVAR(doublewrite_batch_size),
#ifdef UNIV_LINUX
  MYSQL_SYSVAR(sched_priority_purge),
  MYSQL_SYSVAR(sched_priority_io),
  MYSQL_SYSVAR(sched_priority_master),
  MYSQL_SYSVAR(priority_purge),
  MYSQL_SYSVAR(priority_master),
#endif /* UNIV_LINUX */
  MYSQL_SYSVAR(cleaner_max_lru_time),
  MYSQL_SYSVAR(cleaner_max_flush_time),
#endif /* defined UNIV_DEBUG || defined UNIV_PERF_DEBUG */
  MYSQL_SYSVAR(status_output),
  MYSQL_SYSVAR(status_output_locks),
  MYSQL_SYSVAR(cleaner_lsn_age_factor),
  MYSQL_SYSVAR(empty_free_list_algorithm),
  MYSQL_SYSVAR(print_all_deadlocks),
  MYSQL_SYSVAR(cmp_per_index_enabled),
  MYSQL_SYSVAR(undo_logs),
  MYSQL_SYSVAR(max_undo_log_size),
  MYSQL_SYSVAR(purge_rseg_truncate_frequency),
  MYSQL_SYSVAR(undo_log_truncate),
  MYSQL_SYSVAR(rollback_segments),
  MYSQL_SYSVAR(undo_directory),
  MYSQL_SYSVAR(undo_tablespaces),
  MYSQL_SYSVAR(sync_array_size),
  MYSQL_SYSVAR(compression_failure_threshold_pct),
  MYSQL_SYSVAR(compression_pad_pct_max),
  MYSQL_SYSVAR(default_row_format),
#ifdef UNIV_DEBUG
  MYSQL_SYSVAR(trx_rseg_n_slots_debug),
  MYSQL_SYSVAR(limit_optimistic_insert_debug),
  MYSQL_SYSVAR(trx_purge_view_update_only_debug),
  MYSQL_SYSVAR(fil_make_page_dirty_debug),
  MYSQL_SYSVAR(saved_page_number_debug),
  MYSQL_SYSVAR(compress_debug),
  MYSQL_SYSVAR(disable_resize_buffer_pool_debug),
  MYSQL_SYSVAR(page_cleaner_disabled_debug),
  MYSQL_SYSVAR(dict_stats_disabled_debug),
  MYSQL_SYSVAR(master_thread_disabled_debug),
  MYSQL_SYSVAR(sync_debug),
#endif /* UNIV_DEBUG */
  MYSQL_SYSVAR(corrupt_table_action),
  MYSQL_SYSVAR(parallel_doublewrite_path),
  NULL
};

mysql_declare_plugin(innobase)
{
  MYSQL_STORAGE_ENGINE_PLUGIN,
  &innobase_storage_engine,
  innobase_hton_name,
  plugin_author,
  "Percona-XtraDB, Supports transactions, row-level locking, and foreign keys",
  PLUGIN_LICENSE_GPL,
  innobase_init, /* Plugin Init */
  NULL, /* Plugin Deinit */
  INNODB_VERSION_SHORT,
  innodb_status_variables_export,/* status variables             */
  innobase_system_variables, /* system variables */
  NULL, /* reserved */
  0,    /* flags */
},
i_s_xtradb_read_view,
i_s_xtradb_internal_hash_tables,
i_s_xtradb_rseg,
i_s_innodb_trx,
i_s_innodb_locks,
i_s_innodb_lock_waits,
i_s_innodb_cmp,
i_s_innodb_cmp_reset,
i_s_innodb_cmpmem,
i_s_innodb_cmpmem_reset,
i_s_innodb_cmp_per_index,
i_s_innodb_cmp_per_index_reset,
i_s_innodb_buffer_page,
i_s_innodb_buffer_page_lru,
i_s_innodb_buffer_stats,
i_s_innodb_temp_table_info,
i_s_innodb_metrics,
i_s_innodb_ft_default_stopword,
i_s_innodb_ft_deleted,
i_s_innodb_ft_being_deleted,
i_s_innodb_ft_config,
i_s_innodb_ft_index_cache,
i_s_innodb_ft_index_table,
i_s_innodb_sys_tables,
i_s_innodb_sys_tablestats,
i_s_innodb_sys_indexes,
i_s_innodb_sys_columns,
i_s_innodb_sys_fields,
i_s_innodb_sys_foreign,
i_s_innodb_sys_foreign_cols,
i_s_innodb_sys_tablespaces,
i_s_innodb_sys_datafiles,
i_s_innodb_changed_pages,
i_s_innodb_sys_virtual

mysql_declare_plugin_end;

/** @brief Initialize the default value of innodb_commit_concurrency.

Once InnoDB is running, the innodb_commit_concurrency must not change
from zero to nonzero. (Bug #42101)

The initial default value is 0, and without this extra initialization,
SET GLOBAL innodb_commit_concurrency=DEFAULT would set the parameter
to 0, even if it was initially set to nonzero at the command line
or configuration file. */
static
void
innobase_commit_concurrency_init_default()
/*======================================*/
{
	MYSQL_SYSVAR_NAME(commit_concurrency).def_val
		= innobase_commit_concurrency;
}

/** @brief Initialize the default and max value of innodb_undo_logs.

Once InnoDB is running, the default value and the max value of
innodb_undo_logs must be equal to the available undo logs,
given by srv_available_undo_logs. */
static
void
innobase_undo_logs_init_default_max()
/*=================================*/
{
	MYSQL_SYSVAR_NAME(undo_logs).max_val
		= MYSQL_SYSVAR_NAME(undo_logs).def_val
		= static_cast<unsigned long>(srv_available_undo_logs);
}

/****************************************************************************
 * DS-MRR implementation
 ***************************************************************************/

/**
Multi Range Read interface, DS-MRR calls */
int
ha_innobase::multi_range_read_init(
	RANGE_SEQ_IF*	seq,
	void*		seq_init_param,
	uint		n_ranges,
	uint		mode,
	HANDLER_BUFFER*	buf)
{
	return(m_ds_mrr.dsmrr_init(this, seq, seq_init_param,
				 n_ranges, mode, buf));
}

int
ha_innobase::multi_range_read_next(
	char**		range_info)
{
	return(m_ds_mrr.dsmrr_next(range_info));
}

ha_rows
ha_innobase::multi_range_read_info_const(
	uint		keyno,
	RANGE_SEQ_IF*	seq,
	void*		seq_init_param,
	uint		n_ranges,
	uint*		bufsz,
	uint*		flags,
	Cost_estimate*	cost)
{
	/* See comments in ha_myisam::multi_range_read_info_const */
	m_ds_mrr.init(this, table);

	return(m_ds_mrr.dsmrr_info_const(
			keyno, seq, seq_init_param,
			n_ranges, bufsz, flags, cost));
}

ha_rows
ha_innobase::multi_range_read_info(
	uint		keyno,
	uint		n_ranges,
	uint		keys,
	uint*		bufsz,
	uint*		flags,
	Cost_estimate*	cost)
{
	m_ds_mrr.init(this, table);

	return(m_ds_mrr.dsmrr_info(keyno, n_ranges, keys, bufsz, flags, cost));
}

/**
Index Condition Pushdown interface implementation */

/*************************************************************//**
InnoDB index push-down condition check
@return ICP_NO_MATCH, ICP_MATCH, or ICP_OUT_OF_RANGE */
ICP_RESULT
innobase_index_cond(
/*================*/
	void*	file)	/*!< in/out: pointer to ha_innobase */
{
	DBUG_ENTER("innobase_index_cond");

	ha_innobase*	h = reinterpret_cast<class ha_innobase*>(file);

	DBUG_ASSERT(h->pushed_idx_cond);
	DBUG_ASSERT(h->pushed_idx_cond_keyno != MAX_KEY);

	if (h->end_range && h->compare_key_icp(h->end_range) > 0) {

		/* caller should return HA_ERR_END_OF_FILE already */
		DBUG_RETURN(ICP_OUT_OF_RANGE);
	}

	DBUG_RETURN(h->pushed_idx_cond->val_int() ? ICP_MATCH : ICP_NO_MATCH);
}


/** Get the computed value by supplying the base column values.
@param[in,out]	table	the table whose virtual column template to be built */
void
innobase_init_vc_templ(
	dict_table_t*	table)
{
	THD*    thd = current_thd;
	char    dbname[MAX_DATABASE_NAME_LEN + 1];
	char    tbname[MAX_TABLE_NAME_LEN + 1];
	char*   name = table->name.m_name;
	ulint   dbnamelen = dict_get_db_name_len(name);
	ulint   tbnamelen = strlen(name) - dbnamelen - 1;
	char    t_dbname[MAX_DATABASE_NAME_LEN + 1];
	char    t_tbname[MAX_TABLE_NAME_LEN + 1];

	mutex_enter(&dict_sys->mutex);

	if (table->vc_templ != NULL) {
		mutex_exit(&dict_sys->mutex);

		return;
	}

	strncpy(dbname, name, dbnamelen);
	dbname[dbnamelen] = 0;
	strncpy(tbname, name + dbnamelen + 1, tbnamelen);
	tbname[tbnamelen] =0;

	/* For partition table, remove the partition name and use the
	"main" table name to build the template */
#ifdef _WIN32
        char*	is_part = strstr(tbname, "#p#");
#else
        char*	is_part = strstr(tbname, "#P#");
#endif /* _WIN32 */

	if (is_part != NULL) {
		*is_part = '\0';
		tbnamelen = is_part - tbname;
	}

	table->vc_templ = UT_NEW_NOKEY(dict_vcol_templ_t());
	table->vc_templ->vtempl = NULL;

	dbnamelen = filename_to_tablename(dbname, t_dbname,
					  MAX_DATABASE_NAME_LEN + 1);
	tbnamelen = filename_to_tablename(tbname, t_tbname,
					  MAX_TABLE_NAME_LEN + 1);

#ifdef UNIV_DEBUG
	bool ret =
#endif /* UNIV_DEBUG */
	handler::my_prepare_gcolumn_template(
		thd, t_dbname, t_tbname,
		&innobase_build_v_templ_callback,
		static_cast<void*>(table));
	ut_ad(!ret);
	table->vc_templ_purge = true;
	mutex_exit(&dict_sys->mutex);
}

/** Get the computed value by supplying the base column values.
@param[in,out]	row		the data row
@param[in]	col		virtual column
@param[in]	index		index
@param[in,out]	local_heap	heap memory for processing large data etc.
@param[in,out]	heap		memory heap that copies the actual index row
@param[in]	ifield		index field
@param[in]	thd		MySQL thread handle
@param[in,out]	mysql_table	mysql table object
@return the field filled with computed value, or NULL if just want
to store the value in passed in "my_rec" */
dfield_t*
innobase_get_computed_value(
	const dtuple_t*		row,
	const dict_v_col_t*	col,
	const dict_index_t*	index,
	mem_heap_t**		local_heap,
	mem_heap_t*		heap,
	const dict_field_t*	ifield,
	THD*			thd,
	TABLE*			mysql_table)
{
	byte		rec_buf1[REC_VERSION_56_MAX_INDEX_COL_LEN];
	byte		rec_buf2[REC_VERSION_56_MAX_INDEX_COL_LEN];
	byte*		mysql_rec;
	byte*		buf;
	dfield_t*	field;
	ulint		len;
	const page_size_t page_size = dict_table_page_size(index->table);
	ulint		ret = 0;

	ut_ad(index->table->vc_templ);
	ut_ad(thd != NULL);

	const mysql_row_templ_t*
			vctempl =  index->table->vc_templ->vtempl[
				index->table->vc_templ->n_col + col->v_pos];

	if (!heap || index->table->vc_templ->rec_len
		     >= REC_VERSION_56_MAX_INDEX_COL_LEN) {
		if (*local_heap == NULL) {
			*local_heap = mem_heap_create(UNIV_PAGE_SIZE);
		}

		mysql_rec = static_cast<byte*>(mem_heap_alloc(
			    *local_heap, index->table->vc_templ->rec_len));
		buf = static_cast<byte*>(mem_heap_alloc(
				*local_heap, index->table->vc_templ->rec_len));
	} else {
		mysql_rec = rec_buf1;
		buf = rec_buf2;
	}

	for (ulint i = 0; i < col->num_base; i++) {
		dict_col_t*			base_col = col->base_col[i];
		const dfield_t*			row_field;
		ulint				col_no = base_col->ind;
		const mysql_row_templ_t*	templ
			= index->table->vc_templ->vtempl[col_no];
		const byte*			data;

		row_field = dtuple_get_nth_field(row, col_no);

		data = static_cast<const byte*>(row_field->data);
		len = row_field->len;

		if (row_field->ext) {
			if (*local_heap == NULL) {
				*local_heap = mem_heap_create(UNIV_PAGE_SIZE);
			}

			data = btr_copy_externally_stored_field(
				&len, data, page_size,
				dfield_get_len(row_field), *local_heap);
		}

		if (len == UNIV_SQL_NULL) {
                        mysql_rec[templ->mysql_null_byte_offset]
                                |= (byte) templ->mysql_null_bit_mask;
                        memcpy(mysql_rec + templ->mysql_col_offset,
                               static_cast<const byte*>(
					index->table->vc_templ->default_rec
					+ templ->mysql_col_offset),
                               templ->mysql_col_len);
                } else {

			row_sel_field_store_in_mysql_format(
				mysql_rec + templ->mysql_col_offset,
				templ, index, templ->clust_rec_field_no,
				(const byte*)data, len);

			if (templ->mysql_null_bit_mask) {
				/* It is a nullable column with a
				non-NULL value */
				mysql_rec[templ->mysql_null_byte_offset]
					&= ~(byte) templ->mysql_null_bit_mask;
			}
		}
	}

	field = dtuple_get_nth_v_field(row, col->v_pos);

	/* Bitmap for specifying which virtual columns the server
	should evaluate */
	MY_BITMAP	column_map;
	my_bitmap_map	col_map_storage[bitmap_buffer_size(REC_MAX_N_FIELDS)];

	bitmap_init(&column_map, col_map_storage, REC_MAX_N_FIELDS, false);

	/* Specify the column the server should evaluate */
	bitmap_set_bit(&column_map, col->m_col.ind);

	if (mysql_table == NULL) {
		if (vctempl->type == DATA_BLOB) {
			ulint	max_len;

			if (vctempl->mysql_col_len - 8 == 1) {
				/* This is for TINYBLOB only, which needs
				only 1 byte, other BLOBs won't be affected */
				max_len = 255;
			} else {
				max_len = DICT_MAX_FIELD_LEN_BY_FORMAT(
						index->table) + 1;
			}

			byte*   blob_mem = static_cast<byte*>(
				mem_heap_alloc(heap, max_len));

			row_mysql_store_blob_ref(
				mysql_rec + vctempl->mysql_col_offset,
				vctempl->mysql_col_len, blob_mem, max_len);
                }

		ret = handler::my_eval_gcolumn_expr_with_open(
			thd, index->table->vc_templ->db_name.c_str(),
			index->table->vc_templ->tb_name.c_str(), &column_map,
			(uchar *)mysql_rec);
        } else {
		ret = handler::my_eval_gcolumn_expr(
			thd, mysql_table, &column_map,
			(uchar *)mysql_rec);
	}

	if (ret != 0) {
#ifdef INNODB_VIRTUAL_DEBUG
		ib::warn() << "Compute virtual column values failed ";
		fputs("InnoDB: Cannot compute value for following record ",
		      stderr);
		dtuple_print(stderr, row);
#endif /* INNODB_VIRTUAL_DEBUG */
		return(NULL);
	}

	/* we just want to store the data in passed in MySQL record */
	if (ret != 0) {
		return(NULL);
	}

	if (vctempl->mysql_null_bit_mask
	    && (mysql_rec[vctempl->mysql_null_byte_offset]
	        & vctempl->mysql_null_bit_mask)) {
		dfield_set_null(field);
		field->type.prtype |= DATA_VIRTUAL;
		return(field);
	}

	row_mysql_store_col_in_innobase_format(
		field, buf,
		TRUE, mysql_rec + vctempl->mysql_col_offset,
		vctempl->mysql_col_len, dict_table_is_comp(index->table));
	field->type.prtype |= DATA_VIRTUAL;

	ulint	max_prefix = col->m_col.max_prefix;

	if (max_prefix && ifield
	    && (ifield->prefix_len == 0
	        || ifield->prefix_len > col->m_col.max_prefix)) {
		max_prefix = ifield->prefix_len;
	}

	/* If this is a prefix index, we only need a portion of the field */
	if (max_prefix) {
		len = dtype_get_at_most_n_mbchars(
			col->m_col.prtype,
			col->m_col.mbminmaxlen,
			max_prefix,
			field->len,
			static_cast<char*>(dfield_get_data(field)));
		dfield_set_len(field, len);
	}

	if (heap) {
		dfield_dup(field, heap);
	}

	return(field);
}

/** Attempt to push down an index condition.
@param[in] keyno MySQL key number
@param[in] idx_cond Index condition to be checked
@return Part of idx_cond which the handler will not evaluate */

class Item*
ha_innobase::idx_cond_push(
	uint		keyno,
	class Item*	idx_cond)
{
	DBUG_ENTER("ha_innobase::idx_cond_push");
	DBUG_ASSERT(keyno != MAX_KEY);
	DBUG_ASSERT(idx_cond != NULL);

	pushed_idx_cond = idx_cond;
	pushed_idx_cond_keyno = keyno;
	in_range_check_pushed_down = TRUE;
	/* We will evaluate the condition entirely */
	DBUG_RETURN(NULL);
}

/******************************************************************//**
Use this when the args are passed to the format string from
errmsg-utf8.txt directly as is.

Push a warning message to the client, it is a wrapper around:

void push_warning_printf(
	THD *thd, Sql_condition::enum_condition_level level,
	uint code, const char *format, ...);
*/
void
ib_senderrf(
/*========*/
	THD*		thd,		/*!< in/out: session */
	ib_log_level_t	level,		/*!< in: warning level */
	ib_uint32_t	code,		/*!< MySQL error code */
	...)				/*!< Args */
{
	va_list		args;
	char*		str = NULL;
	const char*	format = innobase_get_err_msg(code);

	/* If the caller wants to push a message to the client then
	the caller must pass a valid session handle. */

	ut_a(thd != 0);

	/* The error code must exist in the errmsg-utf8.txt file. */
	ut_a(format != 0);

	va_start(args, code);

#ifdef _WIN32
	int		size = _vscprintf(format, args) + 1;
	if (size > 0) {
		str = static_cast<char*>(malloc(size));
	}
	if (str == NULL) {
		va_end(args);
		return;	/* Watch for Out-Of-Memory */
	}
	str[size - 1] = 0x0;
	vsnprintf(str, size, format, args);
#elif HAVE_VASPRINTF
	int	ret;
	ret = vasprintf(&str, format, args);
	if (ret < 0) {
		va_end(args);
		return;	/* Watch for Out-Of-Memory */
	}
#else
	/* Use a fixed length string. */
	str = static_cast<char*>(malloc(BUFSIZ));
	if (str == NULL) {
		va_end(args);
		return;	/* Watch for Out-Of-Memory */
	}
	my_vsnprintf(str, BUFSIZ, format, args);
#endif /* _WIN32 */

	Sql_condition::enum_severity_level	l;

	l = Sql_condition::SL_NOTE;

	switch (level) {
	case IB_LOG_LEVEL_INFO:
		break;
	case IB_LOG_LEVEL_WARN:
		l = Sql_condition::SL_WARNING;
		break;
	case IB_LOG_LEVEL_ERROR:
		/* We can't use push_warning_printf(), it is a hard error. */
		my_printf_error(code, "%s", MYF(0), str);
		break;
	case IB_LOG_LEVEL_FATAL:
		l = Sql_condition::SEVERITY_END;
		break;
	}

	if (level != IB_LOG_LEVEL_ERROR) {
		push_warning_printf(thd, l, code, "InnoDB: %s", str);
	}

	va_end(args);
	free(str);

	if (level == IB_LOG_LEVEL_FATAL) {
		ut_error;
	}
}

/******************************************************************//**
Use this when the args are first converted to a formatted string and then
passed to the format string from errmsg-utf8.txt. The error message format
must be: "Some string ... %s".

Push a warning message to the client, it is a wrapper around:

void push_warning_printf(
	THD *thd, Sql_condition::enum_condition_level level,
	uint code, const char *format, ...);
*/
void
ib_errf(
/*====*/
	THD*		thd,		/*!< in/out: session */
	ib_log_level_t	level,		/*!< in: warning level */
	ib_uint32_t	code,		/*!< MySQL error code */
	const char*	format,		/*!< printf format */
	...)				/*!< Args */
{
	char*		str = NULL;
	va_list         args;

	/* If the caller wants to push a message to the client then
	the caller must pass a valid session handle. */

	ut_a(thd != 0);
	ut_a(format != 0);

	va_start(args, format);

#ifdef _WIN32
	int		size = _vscprintf(format, args) + 1;
	if (size > 0) {
		str = static_cast<char*>(malloc(size));
	}
	if (str == NULL) {
		va_end(args);
		return;	/* Watch for Out-Of-Memory */
	}
	str[size - 1] = 0x0;
	vsnprintf(str, size, format, args);
#elif HAVE_VASPRINTF
	int	ret;
	ret = vasprintf(&str, format, args);
	if (ret < 0) {
		va_end(args);
		return;	/* Watch for Out-Of-Memory */
	}
#else
	/* Use a fixed length string. */
	str = static_cast<char*>(malloc(BUFSIZ));
	if (str == NULL) {
		va_end(args);
		return;	/* Watch for Out-Of-Memory */
	}
	my_vsnprintf(str, BUFSIZ, format, args);
#endif /* _WIN32 */

	ib_senderrf(thd, level, code, str);

	va_end(args);
	free(str);
}

/* Keep the first 16 characters as-is, since the url is sometimes used
as an offset from this.*/
const char*	TROUBLESHOOTING_MSG =
	"Please refer to " REFMAN "innodb-troubleshooting.html"
	" for how to resolve the issue.";

const char*	TROUBLESHOOT_DATADICT_MSG =
	"Please refer to " REFMAN "innodb-troubleshooting-datadict.html"
	" for how to resolve the issue.";

const char*	BUG_REPORT_MSG =
	"Submit a detailed bug report to http://bugs.mysql.com";

const char*	FORCE_RECOVERY_MSG =
	"Please refer to " REFMAN "forcing-innodb-recovery.html"
	" for information about forcing recovery.";

const char*	ERROR_CREATING_MSG =
	"Please refer to " REFMAN "error-creating-innodb.html";

const char*	OPERATING_SYSTEM_ERROR_MSG =
	"Some operating system error numbers are described at"
	" " REFMAN "operating-system-error-codes.html";

const char*	FOREIGN_KEY_CONSTRAINTS_MSG =
	"Please refer to " REFMAN "innodb-foreign-key-constraints.html"
	" for correct foreign key definition.";

const char*	SET_TRANSACTION_MSG =
	"Please refer to " REFMAN "set-transaction.html";

const char*	INNODB_PARAMETERS_MSG =
	"Please refer to " REFMAN "innodb-parameters.html";

/**********************************************************************
Converts an identifier from my_charset_filename to UTF-8 charset.
@return result string length, as returned by strconvert() */
uint
innobase_convert_to_filename_charset(
/*=================================*/
	char*		to,	/* out: converted identifier */
	const char*	from,	/* in: identifier to convert */
	ulint		len)	/* in: length of 'to', in bytes */
{
	uint		errors;
	CHARSET_INFO*	cs_to = &my_charset_filename;
	CHARSET_INFO*	cs_from = system_charset_info;

	return(static_cast<uint>(strconvert(
		cs_from, from, cs_to, to, static_cast<size_t>(len), &errors)));
}

/**********************************************************************
Converts an identifier from my_charset_filename to UTF-8 charset.
@return result string length, as returned by strconvert() */
uint
innobase_convert_to_system_charset(
/*===============================*/
	char*		to,	/* out: converted identifier */
	const char*	from,	/* in: identifier to convert */
	ulint		len,	/* in: length of 'to', in bytes */
	uint*		errors)	/* out: error return */
{
	CHARSET_INFO*	cs1 = &my_charset_filename;
	CHARSET_INFO*	cs2 = system_charset_info;

	return(static_cast<uint>(strconvert(
		cs1, from, cs2, to, static_cast<size_t>(len), errors)));
}

/**********************************************************************
Issue a warning that the row is too big. */
void
ib_warn_row_too_big(const dict_table_t*	table)
{
	/* If prefix is true then a 768-byte prefix is stored
	locally for BLOB fields. Refer to dict_table_get_format() */
	const bool prefix = (dict_tf_get_format(table->flags)
			     == UNIV_FORMAT_A);

	const ulint	free_space = page_get_free_space_of_empty(
		table->flags & DICT_TF_COMPACT) / 2;

	THD*	thd = current_thd;

	push_warning_printf(
		thd, Sql_condition::SL_WARNING, HA_ERR_TOO_BIG_ROW,
		"Row size too large (> %lu). Changing some columns to TEXT"
		" or BLOB %smay help. In current row format, BLOB prefix of"
		" %d bytes is stored inline.", free_space
		, prefix ? "or using ROW_FORMAT=DYNAMIC or"
		" ROW_FORMAT=COMPRESSED ": ""
		, prefix ? DICT_MAX_FIXED_COL_LEN : 0);
}

/** Validate the requested buffer pool size.  Also, reserve the necessary
memory needed for buffer pool resize.
@param[in]	thd	thread handle
@param[in]	var	pointer to system variable
@param[out]	save	immediate result for update function
@param[in]	value	incoming string
@return 0 on success, 1 on failure.
*/
static
int
innodb_buffer_pool_size_validate(
	THD*				thd,
	struct st_mysql_sys_var*	var,
	void*				save,
	struct st_mysql_value*		value)
{
	longlong	intbuf;


	value->val_int(value, &intbuf);

	if (!srv_was_started) {
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "Cannot update innodb_buffer_pool_size,"
				    " because InnoDB is not started.");
		return(1);
	}

#ifdef UNIV_DEBUG
	if (buf_disable_resize_buffer_pool_debug == TRUE) {
		push_warning_printf(thd, Sql_condition::SL_WARNING,
			ER_WRONG_ARGUMENTS,
			"Cannot update innodb_buffer_pool_size,"
			" because innodb_disable_resize_buffer_pool_debug"
			" is set.");
		ib::warn() << "Cannot update innodb_buffer_pool_size,"
			" because innodb_disable_resize_buffer_pool_debug"
			" is set.";
		return(1);
	}
#endif /* UNIV_DEBUG */

	os_rmb;

	if (srv_buf_pool_old_size != srv_buf_pool_size) {
		my_error(ER_BUFPOOL_RESIZE_INPROGRESS, MYF(0));
		return(1);
	}

	if (srv_buf_pool_instances > 1 && intbuf < BUF_POOL_SIZE_THRESHOLD) {

		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_WRONG_ARGUMENTS,
				    "Cannot update innodb_buffer_pool_size"
				    " to less than 1GB if"
				    " innodb_buffer_pool_instances > 1.");
		return(1);
	}

	ulint	requested_buf_pool_size
		= buf_pool_size_align(static_cast<ulint>(intbuf));

	*static_cast<longlong*>(save) = requested_buf_pool_size;

	if (srv_buf_pool_size == requested_buf_pool_size) {
		/* nothing to do */
		return(0);
	}

	srv_buf_pool_size = requested_buf_pool_size;
	os_wmb;

	if (intbuf != static_cast<longlong>(requested_buf_pool_size)) {
		char	buf[64];
		int	len = 64;
		value->val_str(value, buf, &len);
		push_warning_printf(thd, Sql_condition::SL_WARNING,
				    ER_TRUNCATED_WRONG_VALUE,
				    ER(ER_TRUNCATED_WRONG_VALUE),
				    mysql_sysvar_buffer_pool_size.name,
				    value->val_str(value, buf, &len));
	}

	return(0);
}
