set @read_rnd_buffer_size_save= @@read_rnd_buffer_size;
set read_rnd_buffer_size=79;
select @@read_rnd_buffer_size;
@@read_rnd_buffer_size
79
create table t1(a int);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2(a int);
insert into t2 select A.a + 10*(B.a + 10*C.a) from t1 A, t1 B, t1 C;
create table t3 (
a char(8) not null, b char(8) not null, filler char(200),
key(a)
);
insert into t3 select @a:=concat('c-', 1000+ A.a, '=w'), @a, 'filler' from t2 A;
insert into t3 select concat('c-', 1000+A.a, '=w'), concat('c-', 2000+A.a, '=w'), 
'filler-1' from t2 A;
insert into t3 select concat('c-', 1000+A.a, '=w'), concat('c-', 3000+A.a, '=w'), 
'filler-2' from t2 A;
select a,filler from t3 where a >= 'c-9011=w';
a	filler
select a,filler from t3 where a >= 'c-1011=w' and a <= 'c-1015=w';
a	filler
c-1011=w	filler
c-1011=w	filler-1
c-1011=w	filler-2
c-1012=w	filler
c-1012=w	filler-1
c-1012=w	filler-2
c-1013=w	filler
c-1013=w	filler-1
c-1013=w	filler-2
c-1014=w	filler
c-1014=w	filler-1
c-1014=w	filler-2
c-1015=w	filler
c-1015=w	filler-1
c-1015=w	filler-2
select a,filler from t3 where (a>='c-1011=w' and a <= 'c-1013=w') or
(a>='c-1014=w' and a <= 'c-1015=w');
a	filler
c-1011=w	filler
c-1011=w	filler-1
c-1011=w	filler-2
c-1012=w	filler
c-1012=w	filler-1
c-1012=w	filler-2
c-1013=w	filler
c-1013=w	filler-1
c-1013=w	filler-2
c-1014=w	filler
c-1014=w	filler-1
c-1014=w	filler-2
c-1015=w	filler
c-1015=w	filler-1
c-1015=w	filler-2
insert into t3 values ('c-1013=z', 'c-1013=z', 'err');
insert into t3 values ('a-1014=w', 'a-1014=w', 'err');
select a,filler from t3 where (a>='c-1011=w' and a <= 'c-1013=w') or
(a>='c-1014=w' and a <= 'c-1015=w');
a	filler
c-1011=w	filler
c-1011=w	filler-1
c-1011=w	filler-2
c-1012=w	filler
c-1012=w	filler-1
c-1012=w	filler-2
c-1013=w	filler
c-1013=w	filler-1
c-1013=w	filler-2
c-1014=w	filler
c-1014=w	filler-1
c-1014=w	filler-2
c-1015=w	filler
c-1015=w	filler-1
c-1015=w	filler-2
delete from t3 where b in ('c-1013=z', 'a-1014=w');
select a,filler from t3 where a='c-1011=w' or a='c-1012=w' or a='c-1013=w' or
a='c-1014=w' or a='c-1015=w';
a	filler
c-1011=w	filler
c-1011=w	filler-1
c-1011=w	filler-2
c-1012=w	filler
c-1012=w	filler-1
c-1012=w	filler-2
c-1013=w	filler
c-1013=w	filler-1
c-1013=w	filler-2
c-1014=w	filler
c-1014=w	filler-1
c-1014=w	filler-2
c-1015=w	filler
c-1015=w	filler-1
c-1015=w	filler-2
insert into t3 values ('c-1013=w', 'del-me', 'inserted');
select a,filler from t3 where a='c-1011=w' or a='c-1012=w' or a='c-1013=w' or
a='c-1014=w' or a='c-1015=w';
a	filler
c-1011=w	filler
c-1011=w	filler-1
c-1011=w	filler-2
c-1012=w	filler
c-1012=w	filler-1
c-1012=w	filler-2
c-1013=w	filler
c-1013=w	filler-1
c-1013=w	filler-2
c-1013=w	inserted
c-1014=w	filler
c-1014=w	filler-1
c-1014=w	filler-2
c-1015=w	filler
c-1015=w	filler-1
c-1015=w	filler-2
delete from t3 where b='del-me';
alter table t3 add primary key(b);
select b,filler from t3 where (b>='c-1011=w' and b<= 'c-1018=w') or 
b IN ('c-1019=w', 'c-1020=w', 'c-1021=w', 
'c-1022=w', 'c-1023=w', 'c-1024=w');
b	filler
c-1011=w	filler
c-1012=w	filler
c-1013=w	filler
c-1014=w	filler
c-1015=w	filler
c-1016=w	filler
c-1017=w	filler
c-1018=w	filler
c-1019=w	filler
c-1020=w	filler
c-1021=w	filler
c-1022=w	filler
c-1023=w	filler
c-1024=w	filler
select b,filler from t3 where (b>='c-1011=w' and b<= 'c-1020=w') or 
b IN ('c-1021=w', 'c-1022=w', 'c-1023=w');
b	filler
c-1011=w	filler
c-1012=w	filler
c-1013=w	filler
c-1014=w	filler
c-1015=w	filler
c-1016=w	filler
c-1017=w	filler
c-1018=w	filler
c-1019=w	filler
c-1020=w	filler
c-1021=w	filler
c-1022=w	filler
c-1023=w	filler
select b,filler from t3 where (b>='c-1011=w' and b<= 'c-1018=w') or 
b IN ('c-1019=w', 'c-1020=w') or 
(b>='c-1021=w' and b<= 'c-1023=w');
b	filler
c-1011=w	filler
c-1012=w	filler
c-1013=w	filler
c-1014=w	filler
c-1015=w	filler
c-1016=w	filler
c-1017=w	filler
c-1018=w	filler
c-1019=w	filler
c-1020=w	filler
c-1021=w	filler
c-1022=w	filler
c-1023=w	filler
create table t4 (a varchar(10), b int, c char(10), filler char(200),
key idx1 (a, b, c));
insert into t4 (filler) select concat('NULL-', 15-a) from t2 order by a limit 15;
insert into t4 (a,b,c,filler) 
select 'b-1',NULL,'c-1', concat('NULL-', 15-a) from t2 order by a limit 15;
insert into t4 (a,b,c,filler) 
select 'b-1',NULL,'c-222', concat('NULL-', 15-a) from t2 order by a limit 15;
insert into t4 (a,b,c,filler) 
select 'bb-1',NULL,'cc-2', concat('NULL-', 15-a) from t2 order by a limit 15;
insert into t4 (a,b,c,filler) 
select 'zz-1',NULL,'cc-2', 'filler-data' from t2 order by a limit 500;
explain 
select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1'
                                                      or c='no-such-row2');
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t4	NULL	range	idx1	idx1	29	NULL	10	100.00	Using where
Warnings:
Note	1003	/* select#1 */ select `test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t4`.`c` AS `c`,`test`.`t4`.`filler` AS `filler` from `test`.`t4` where (isnull(`test`.`t4`.`a`) and isnull(`test`.`t4`.`b`) and (isnull(`test`.`t4`.`c`) or (`test`.`t4`.`c` = 'no-such-row1') or (`test`.`t4`.`c` = 'no-such-row2')))
select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1'
                                                    or c='no-such-row2');
a	b	c	filler
NULL	NULL	NULL	NULL-15
NULL	NULL	NULL	NULL-14
NULL	NULL	NULL	NULL-13
NULL	NULL	NULL	NULL-12
NULL	NULL	NULL	NULL-11
NULL	NULL	NULL	NULL-10
NULL	NULL	NULL	NULL-9
NULL	NULL	NULL	NULL-8
NULL	NULL	NULL	NULL-7
NULL	NULL	NULL	NULL-6
NULL	NULL	NULL	NULL-5
NULL	NULL	NULL	NULL-4
NULL	NULL	NULL	NULL-3
NULL	NULL	NULL	NULL-2
NULL	NULL	NULL	NULL-1
explain 
select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2');
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t4	NULL	range	idx1	idx1	29	NULL	21	100.00	Using where
Warnings:
Note	1003	/* select#1 */ select `test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t4`.`c` AS `c`,`test`.`t4`.`filler` AS `filler` from `test`.`t4` where (((`test`.`t4`.`a` = 'b-1') or (`test`.`t4`.`a` = 'bb-1')) and isnull(`test`.`t4`.`b`) and ((`test`.`t4`.`c` = 'c-1') or (`test`.`t4`.`c` = 'cc-2')))
select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2');
a	b	c	filler
b-1	NULL	c-1	NULL-15
b-1	NULL	c-1	NULL-14
b-1	NULL	c-1	NULL-13
b-1	NULL	c-1	NULL-12
b-1	NULL	c-1	NULL-11
b-1	NULL	c-1	NULL-10
b-1	NULL	c-1	NULL-9
b-1	NULL	c-1	NULL-8
b-1	NULL	c-1	NULL-7
b-1	NULL	c-1	NULL-6
b-1	NULL	c-1	NULL-5
b-1	NULL	c-1	NULL-4
b-1	NULL	c-1	NULL-3
b-1	NULL	c-1	NULL-2
b-1	NULL	c-1	NULL-1
bb-1	NULL	cc-2	NULL-15
bb-1	NULL	cc-2	NULL-14
bb-1	NULL	cc-2	NULL-13
bb-1	NULL	cc-2	NULL-12
bb-1	NULL	cc-2	NULL-11
bb-1	NULL	cc-2	NULL-10
bb-1	NULL	cc-2	NULL-9
bb-1	NULL	cc-2	NULL-8
bb-1	NULL	cc-2	NULL-7
bb-1	NULL	cc-2	NULL-6
bb-1	NULL	cc-2	NULL-5
bb-1	NULL	cc-2	NULL-4
bb-1	NULL	cc-2	NULL-3
bb-1	NULL	cc-2	NULL-2
bb-1	NULL	cc-2	NULL-1
select * from t4 ignore index(idx1) where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2');
a	b	c	filler
b-1	NULL	c-1	NULL-15
b-1	NULL	c-1	NULL-14
b-1	NULL	c-1	NULL-13
b-1	NULL	c-1	NULL-12
b-1	NULL	c-1	NULL-11
b-1	NULL	c-1	NULL-10
b-1	NULL	c-1	NULL-9
b-1	NULL	c-1	NULL-8
b-1	NULL	c-1	NULL-7
b-1	NULL	c-1	NULL-6
b-1	NULL	c-1	NULL-5
b-1	NULL	c-1	NULL-4
b-1	NULL	c-1	NULL-3
b-1	NULL	c-1	NULL-2
b-1	NULL	c-1	NULL-1
bb-1	NULL	cc-2	NULL-15
bb-1	NULL	cc-2	NULL-14
bb-1	NULL	cc-2	NULL-13
bb-1	NULL	cc-2	NULL-12
bb-1	NULL	cc-2	NULL-11
bb-1	NULL	cc-2	NULL-10
bb-1	NULL	cc-2	NULL-9
bb-1	NULL	cc-2	NULL-8
bb-1	NULL	cc-2	NULL-7
bb-1	NULL	cc-2	NULL-6
bb-1	NULL	cc-2	NULL-5
bb-1	NULL	cc-2	NULL-4
bb-1	NULL	cc-2	NULL-3
bb-1	NULL	cc-2	NULL-2
bb-1	NULL	cc-2	NULL-1
drop table t1, t2, t3, t4;
create table t1 (a int, b int not null,unique key (a,b),index(b));
insert ignore into t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(null,7),(9,9),(8,8),(7,7),(null,9),(null,9),(6,6);
Warnings:
Warning	1062	Duplicate entry '6-6' for key 'a'
create table t2 like t1;
insert into t2 select * from t1;
alter table t1 modify b blob not null, add c int not null, drop key a, add unique key (a,b(20),c), drop key b, add key (b(10));
select * from t1 where a is null;
a	b	c
NULL	7	0
NULL	9	0
NULL	9	0
select * from t1 where (a is null or a > 0 and a < 3) and b > 7 limit 3;
a	b	c
NULL	9	0
NULL	9	0
select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
a	b	c
NULL	7	0
NULL	9	0
NULL	9	0
drop table t1, t2;
CREATE TABLE t1 (
ID int(10) unsigned NOT NULL AUTO_INCREMENT,
col1 int(10) unsigned DEFAULT NULL,
key1 int(10) unsigned NOT NULL DEFAULT '0',
key2 int(10) unsigned DEFAULT NULL,
text1 text,
text2 text,
col2 smallint(6) DEFAULT '100',
col3 enum('headers','bodyandsubject') NOT NULL DEFAULT 'bodyandsubject',
col4 tinyint(3) unsigned NOT NULL DEFAULT '0',
PRIMARY KEY (ID),
KEY (key1),
KEY (key2)
) AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;
INSERT INTO t1 VALUES
(1,NULL,1130,NULL,'Hello',NULL,100,'bodyandsubject',0),
(2,NULL,1130,NULL,'bye',NULL,100,'bodyandsubject',0),
(3,NULL,1130,NULL,'red',NULL,100,'bodyandsubject',0),
(4,NULL,1130,NULL,'yellow',NULL,100,'bodyandsubject',0),
(5,NULL,1130,NULL,'blue',NULL,100,'bodyandsubject',0);
select * FROM t1 WHERE key1=1130 AND col1 IS NULL ORDER BY text1;
ID	col1	key1	key2	text1	text2	col2	col3	col4
5	NULL	1130	NULL	blue	NULL	100	bodyandsubject	0
2	NULL	1130	NULL	bye	NULL	100	bodyandsubject	0
1	NULL	1130	NULL	Hello	NULL	100	bodyandsubject	0
3	NULL	1130	NULL	red	NULL	100	bodyandsubject	0
4	NULL	1130	NULL	yellow	NULL	100	bodyandsubject	0
drop table t1;

BUG#37851: Crash in test_if_skip_sort_order tab->select is zero

CREATE TABLE t1 (
pk int(11) NOT NULL AUTO_INCREMENT,
PRIMARY KEY (pk)
);
INSERT INTO t1 VALUES (1);
CREATE TABLE t2 (
pk int(11) NOT NULL AUTO_INCREMENT,
int_key int(11) DEFAULT NULL,
PRIMARY KEY (pk),
KEY int_key (int_key)
);
INSERT INTO t2 VALUES (1,1),(2,6),(3,0);
EXPLAIN EXTENDED
SELECT MIN(t1.pk)
FROM t1 WHERE EXISTS (
SELECT t2.pk
FROM t2
WHERE t2.int_key IS NULL
GROUP BY t2.pk
);
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
2	SUBQUERY	t2	NULL	ref	int_key	int_key	5	const	1	100.00	Using where
Warnings:
Warning	1681	'EXTENDED' is deprecated and will be removed in a future release.
Note	1003	/* select#1 */ select min(`test`.`t1`.`pk`) AS `MIN(t1.pk)` from `test`.`t1` where 0
DROP TABLE t1, t2;
#
# BUG#42048 Discrepancy between MyISAM and Maria's ICP implementation
#
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a int, b char(20), filler char(200), key(a,b(10)));
insert into t1 select A.a + 10*(B.a + 10*C.a), 'bbb','filler' from t0 A, t0 B, t0 C;
update t1 set b=repeat(char(65+a), 20) where a < 25;
This must show range + using index condition:
explain select * from t1 where a < 10 and b = repeat(char(65+a), 20);
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	range	a	a	5	NULL	x	x	Using where
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`filler` AS `filler` from `test`.`t1` where ((`test`.`t1`.`a` < 10) and (`test`.`t1`.`b` = repeat(char((65 + `test`.`t1`.`a`)),20)))
select * from t1 where a < 10 and b = repeat(char(65+a), 20);
a	b	filler
0	AAAAAAAAAAAAAAAAAAAA	filler
1	BBBBBBBBBBBBBBBBBBBB	filler
2	CCCCCCCCCCCCCCCCCCCC	filler
3	DDDDDDDDDDDDDDDDDDDD	filler
4	EEEEEEEEEEEEEEEEEEEE	filler
5	FFFFFFFFFFFFFFFFFFFF	filler
6	GGGGGGGGGGGGGGGGGGGG	filler
7	HHHHHHHHHHHHHHHHHHHH	filler
8	IIIIIIIIIIIIIIIIIIII	filler
9	JJJJJJJJJJJJJJJJJJJJ	filler
drop table t0,t1;
#
# BUG#41136: ORDER BY + range access: EXPLAIN shows "Using MRR" while MRR is actually not used
#
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a int, b int, key(a));
insert into t1 select A.a + 10 *(B.a + 10*C.a), A.a + 10 *(B.a + 10*C.a) from t0 A, t0 B, t0 C;
This mustn't show "Using MRR":
explain select * from t1 where a < 20  order by a;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	range	a	a	5	NULL	20	100.00	Using where
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`a` < 20) order by `test`.`t1`.`a`
drop table t0, t1;
set @read_rnd_buffer_size_save= @@read_rnd_buffer_size;
set read_rnd_buffer_size=64;
create table t1(a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2(a char(8), b char(8), c char(8), filler char(100), key k1(a,b,c) );
insert into t2 select 
concat('a-', 1000 + A.a, '-a'),
concat('b-', 1000 + B.a, '-b'),
concat('c-', 1000 + C.a, '-c'),
'filler'
from t1 A, t1 B, t1 C;
EXPLAIN select count(length(a) + length(filler))
from t2 force index (k1)
where a>='a-1000-a' and a <'a-1001-a';
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	NULL	range	k1	k1	9	NULL	92	100.00	Using where
Warnings:
Note	1003	/* select#1 */ select count((length(`test`.`t2`.`a`) + length(`test`.`t2`.`filler`))) AS `count(length(a) + length(filler))` from `test`.`t2` FORCE INDEX (`k1`) where ((`test`.`t2`.`a` >= 'a-1000-a') and (`test`.`t2`.`a` < 'a-1001-a'))
select count(length(a) + length(filler))
from t2 force index (k1)
where a>='a-1000-a' and a <'a-1001-a';
count(length(a) + length(filler))
100
drop table t2;
create table t2 (a char(100), b char(100), c char(100), d int, 
filler char(10), key(d), primary key (a,b,c));
insert into t2 select A.a, B.a, B.a, A.a, 'filler' from t1 A, t1 B;
explain select * from t2 force index (d) where d < 10;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	NULL	range	d	d	5	NULL	#	100.00	Using where
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d`,`test`.`t2`.`filler` AS `filler` from `test`.`t2` FORCE INDEX (`d`) where (`test`.`t2`.`d` < 10)
drop table t2;
drop table t1;
set @@read_rnd_buffer_size= @read_rnd_buffer_size_save;
create table t1 (f1 int not null, f2 int not null,f3 int not null, f4 char(1), primary key (f1,f2), key ix(f3));
select * from t1 where (f3>=5 and f3<=10) or (f3>=1 and f3<=4);
f1	f2	f3	f4
1	1	1	A
10	10	10	A
2	2	2	A
3	3	3	A
4	4	4	A
5	5	5	A
6	6	6	A
7	7	7	A
8	8	8	A
9	9	9	A
drop table t1;

BUG#37977: Wrong result returned on GROUP BY + OR + Innodb

CREATE TABLE t1 (
`pk` int(11) NOT NULL AUTO_INCREMENT,
`int_nokey` int(11) NOT NULL,
`int_key` int(11) NOT NULL,
`date_key` date NOT NULL,
`date_nokey` date NOT NULL,
`time_key` time NOT NULL,
`time_nokey` time NOT NULL,
`datetime_key` datetime NOT NULL,
`datetime_nokey` datetime NOT NULL,
`varchar_key` varchar(5) DEFAULT NULL,
`varchar_nokey` varchar(5) DEFAULT NULL,
PRIMARY KEY (`pk`),
KEY `int_key` (`int_key`),
KEY `date_key` (`date_key`),
KEY `time_key` (`time_key`),
KEY `datetime_key` (`datetime_key`),
KEY `varchar_key` (`varchar_key`)
);
INSERT IGNORE INTO t1 VALUES 
(1,5,5,'2009-10-16','2009-10-16','09:28:15','09:28:15','2007-09-14 05:34:08','2007-09-14 05:34:08','qk','qk'),
(2,6,6,'0000-00-00','0000-00-00','23:06:39','23:06:39','0000-00-00 00:00:00','0000-00-00 00:00:00','j','j'),
(3,10,10,'2000-12-18','2000-12-18','22:16:19','22:16:19','2006-11-04 15:42:50','2006-11-04 15:42:50','aew','aew'),
(4,0,0,'2001-09-18','2001-09-18','00:00:00','00:00:00','2004-03-23 13:23:35','2004-03-23 13:23:35',NULL,NULL),
(5,6,6,'2007-08-16','2007-08-16','22:13:38','22:13:38','2004-08-19 11:01:28','2004-08-19 11:01:28','qu','qu');
Warnings:
Warning	1264	Out of range value for column 'date_key' at row 2
Warning	1264	Out of range value for column 'date_nokey' at row 2
Warning	1264	Out of range value for column 'datetime_key' at row 2
Warning	1264	Out of range value for column 'datetime_nokey' at row 2
select pk from t1 WHERE `varchar_key` > 'kr' group by pk;
pk
1
5
select pk from t1 WHERE `int_nokey` IS NULL OR  `varchar_key` > 'kr' group by pk;
pk
1
5
drop table t1;
#
# BUG#39447: Error with NOT NULL condition and LIMIT 1
#
CREATE TABLE t1 (                 
id int(11) NOT NULL,                
parent_id int(11) DEFAULT NULL,     
name varchar(10) DEFAULT NULL,      
PRIMARY KEY (id),                   
KEY ind_parent_id (parent_id)     
);
insert into t1 (id, parent_id, name) values
(10,NULL,'A'),
(20,10,'B'),
(30,10,'C'),
(40,NULL,'D'),
(50,40,'E'),
(60,40,'F'),
(70,NULL,'J');
SELECT id FROM t1 WHERE parent_id IS NOT NULL ORDER BY id DESC LIMIT 1;
id
60
This must show type=index, extra=Using where
explain SELECT * FROM t1 WHERE parent_id IS NOT NULL ORDER BY id DESC LIMIT 1;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	index	ind_parent_id	PRIMARY	4	NULL	1	57.14	Using where
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`id` AS `id`,`test`.`t1`.`parent_id` AS `parent_id`,`test`.`t1`.`name` AS `name` from `test`.`t1` where (`test`.`t1`.`parent_id` is not null) order by `test`.`t1`.`id` desc limit 1
SELECT * FROM t1 WHERE parent_id IS NOT NULL ORDER BY id DESC LIMIT 1;
id	parent_id	name
60	40	F
drop table t1;
#
# Bug#50381 "Assertion failing in handler.h:1283: 
#            void COST_VECT::add_io(double, double)"
#
CREATE TABLE t1 (
c1 INT NOT NULL,
c2 VARCHAR(1) DEFAULT NULL,
PRIMARY KEY (c1)
);
CREATE TABLE t2 (
c1 INT NOT NULL,
c2 VARCHAR(1) DEFAULT NULL,
PRIMARY KEY (c1)
);
INSERT INTO t2 VALUES (10,'v');
INSERT INTO t2 VALUES (11,'r');
SELECT t1.c2  
FROM t2 STRAIGHT_JOIN t1 ON t1.c1 < t2.c1;
c2
DROP TABLE t1, t2;
#
# Bug#58463: Error Can't find record on SELECT with JOIN and ORDER BY
#
CREATE TABLE t1 (
pk INT NOT NULL,
PRIMARY KEY (pk)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (2);
CREATE TABLE t2 (
pk INT NOT NULL,
i1 INT NOT NULL,
i2 INT NOT NULL,
c1 VARCHAR(1024) CHARACTER SET utf8,
PRIMARY KEY (pk),
KEY k1 (i1)
);
INSERT INTO t2 VALUES (3, 9, 1, NULL);
EXPLAIN SELECT i1
FROM t1 LEFT JOIN t2 ON t1.pk = t2.i2
WHERE t2.i1 > 5
AND t2.pk IS  NULL
ORDER BY i1;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
Warnings:
Note	1003	/* select#1 */ select '9' AS `i1` from dual where 0 order by '9'
SELECT i1
FROM t1 LEFT JOIN t2 ON t1.pk = t2.i2
WHERE t2.i1 > 5
AND t2.pk IS  NULL
ORDER BY i1;
i1
DROP TABLE t1, t2;
#
# Bug#12321461: CRASH IN DSMRR_IMPL::DSMRR_INIT ON SELECT STRAIGHT_JOIN
#
set @save_optimizer_switch = @@optimizer_switch;
set optimizer_switch='block_nested_loop=off,batched_key_access=off';
CREATE TABLE t1 (
pk INTEGER,
c1 VARCHAR(1) NOT NULL,
PRIMARY KEY (pk)
);
CREATE TABLE t2 (
c1 VARCHAR(1) NOT NULL
);
INSERT INTO t2 VALUES ('v'), ('c');
EXPLAIN SELECT STRAIGHT_JOIN t1.c1
FROM t1 RIGHT OUTER JOIN t2 ON t1.c1 = t2.c1
WHERE t1.pk > 176;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	NULL	ALL	NULL	NULL	NULL	NULL	2	100.00	NULL
1	SIMPLE	t1	NULL	range	PRIMARY	PRIMARY	4	NULL	1	100.00	Using where
Warnings:
Note	1003	/* select#1 */ select straight_join `test`.`t1`.`c1` AS `c1` from `test`.`t2` join `test`.`t1` where ((`test`.`t1`.`c1` = `test`.`t2`.`c1`) and (`test`.`t1`.`pk` > 176))
SELECT STRAIGHT_JOIN t1.c1
FROM t1 RIGHT OUTER JOIN t2 ON t1.c1 = t2.c1
WHERE t1.pk > 176;
c1
DROP TABLE t1,t2;
set optimizer_switch= @save_optimizer_switch;
#
# Bug#13249966 MRR: RANDOM ERROR DUE TO UNINITIALIZED RES WITH 
#              SMALL READ_RND_BUFFER_SIZE
#
set @read_rnd_buffer_size_save= @@read_rnd_buffer_size;
set read_rnd_buffer_size=1;
select @@read_rnd_buffer_size;
@@read_rnd_buffer_size
1
CREATE TABLE t1 (
i1 INTEGER NOT NULL,
i2 INTEGER NOT NULL,
KEY (i2)
);
INSERT INTO t1 VALUES (0,1),(1,2),(2,3);
EXPLAIN SELECT i1
FROM t1
WHERE i2 > 2;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	range	i2	i2	4	NULL	2	100.00	Using where
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`i1` AS `i1` from `test`.`t1` where (`test`.`t1`.`i2` > 2)
SELECT i1
FROM t1
WHERE i2 > 2;
i1
2
DROP TABLE t1;
set @@read_rnd_buffer_size= @read_rnd_buffer_size_save;
select @@read_rnd_buffer_size;
@@read_rnd_buffer_size
79
#
# Bug 12365385 STRAIGHT_JOIN QUERY QUICKLY EXHAUSTS SYSTEM+VIRT. 
#              MEMORY LEADING TO SYSTEM CRASH
#
CREATE TABLE ten (a INTEGER);
INSERT INTO ten VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
CREATE TABLE t1 (
pk INTEGER NOT NULL,
i1 INTEGER NOT NULL,
c1 VARCHAR(10) NOT NULL,
PRIMARY KEY (pk)
);
INSERT INTO t1
SELECT a, 1, 'MySQL' FROM ten;
CREATE TABLE t2 (
pk INTEGER NOT NULL,
c1 VARCHAR(10) NOT NULL,
c2 varchar(10) NOT NULL,
PRIMARY KEY (pk)
);
INSERT INTO t2
SELECT a, 'MySQL', 'MySQL' FROM ten;
CREATE TABLE t3 (
pk INTEGER NOT NULL,
c1 VARCHAR(10) NOT NULL,
PRIMARY KEY (pk)
);
INSERT INTO t3
SELECT a, 'MySQL' FROM ten;
CREATE TABLE t4 (
pk int(11) NOT NULL,
c1_key varchar(10) CHARACTER SET utf8 NOT NULL,
c2 varchar(10) NOT NULL,
c3 varchar(10) NOT NULL,
PRIMARY KEY (pk),
KEY k1 (c1_key)
);
CREATE TABLE t5 (
pk INTEGER NOT NULL,
c1 VARCHAR(10) NOT NULL,
PRIMARY KEY (pk)
);
INSERT INTO t5
SELECT a, 'MySQL' FROM ten;
EXPLAIN SELECT STRAIGHT_JOIN *
FROM 
(t1 LEFT JOIN 
(t2 LEFT JOIN
(t3 LEFT OUTER JOIN t4 ON t3.c1 <= t4.c1_key)
ON t2.c1 = t4.c3) 
ON t1.c1 = t4.c2)
RIGHT OUTER JOIN t5 ON t2.c2 <= t5.c1
WHERE t1.i1 = 1;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t5	NULL	ALL	NULL	NULL	NULL	NULL	10	100.00	NULL
1	SIMPLE	t1	NULL	ALL	NULL	NULL	NULL	NULL	10	10.00	Using where; Using join buffer (Block Nested Loop)
1	SIMPLE	t2	NULL	ALL	NULL	NULL	NULL	NULL	10	33.33	Using where; Using join buffer (Block Nested Loop)
1	SIMPLE	t3	NULL	ALL	NULL	NULL	NULL	NULL	10	100.00	Using join buffer (Block Nested Loop)
1	SIMPLE	t4	NULL	ALL	k1	NULL	NULL	NULL	0	0.00	Range checked for each record (index map: 0x2)
Warnings:
Note	1003	/* select#1 */ select straight_join `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`i1` AS `i1`,`test`.`t1`.`c1` AS `c1`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`c1` AS `c1`,`test`.`t2`.`c2` AS `c2`,`test`.`t3`.`pk` AS `pk`,`test`.`t3`.`c1` AS `c1`,`test`.`t4`.`pk` AS `pk`,`test`.`t4`.`c1_key` AS `c1_key`,`test`.`t4`.`c2` AS `c2`,`test`.`t4`.`c3` AS `c3`,`test`.`t5`.`pk` AS `pk`,`test`.`t5`.`c1` AS `c1` from `test`.`t5` join `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` where ((`test`.`t4`.`c3` = `test`.`t2`.`c1`) and (`test`.`t4`.`c2` = `test`.`t1`.`c1`) and (`test`.`t1`.`i1` = 1) and (`test`.`t2`.`c2` <= `test`.`t5`.`c1`) and (convert(`test`.`t3`.`c1` using utf8) <= `test`.`t4`.`c1_key`))
SELECT STRAIGHT_JOIN *
FROM 
(t1 LEFT JOIN 
(t2 LEFT JOIN
(t3 LEFT OUTER JOIN t4 ON t3.c1 <= t4.c1_key)
ON t2.c1 = t4.c3) 
ON t1.c1 = t4.c2)
RIGHT OUTER JOIN t5 ON t2.c2 <= t5.c1
WHERE t1.i1 = 1;
pk	i1	c1	pk	c1	c2	pk	c1	pk	c1_key	c2	c3	pk	c1
DROP TABLE ten, t1, t2, t3, t4, t5;
#
# Bug 18172819 CRASH ON DSMRR_IMPL::CHOOSE_MRR_IMPL IN SQL/HANDLER.CC 
#
set @big_tables_save= @@big_tables;
set @optimizer_switch_save=@@optimizer_switch;
set big_tables=ON;
set optimizer_switch='derived_merge=off';
SELECT @@big_tables;
@@big_tables
1
CREATE TABLE t1 (
i1 INTEGER NOT NULL,
c1 VARCHAR(1)
);
INSERT INTO t1 VALUES (1,'a'), (2, NULL);
CREATE TABLE t2 (
c1 VARCHAR(1),
i1 INTEGER NOT NULL,
KEY (c1)
);
INSERT INTO t2 VALUES ('a', 1), (NULL, 2);
EXPLAIN SELECT *
FROM
( SELECT * FROM  t1 ) AS d1
WHERE d1.c1 IN ( SELECT c1 FROM t2 )
AND d1.c1 IS NULL
ORDER BY d1.i1;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	NULL	ref	<auto_key0>	<auto_key0>	4	const	1	100.00	Using where; Using filesort
3	DEPENDENT SUBQUERY	t2	NULL	index_subquery	c1	c1	4	func	1	100.00	Using index
2	DERIVED	t1	NULL	ALL	NULL	NULL	NULL	NULL	2	100.00	NULL
Warnings:
Note	1003	/* select#1 */ select `d1`.`i1` AS `i1`,`d1`.`c1` AS `c1` from (/* select#2 */ select `test`.`t1`.`i1` AS `i1`,`test`.`t1`.`c1` AS `c1` from `test`.`t1`) `d1` where (<in_optimizer>(`d1`.`c1`,<exists>(<index_lookup>(<cache>(`d1`.`c1`) in t2 on c1))) and isnull(`d1`.`c1`)) order by `d1`.`i1`
SELECT *
FROM
( SELECT * FROM  t1 ) AS d1
WHERE d1.c1 IN ( SELECT c1 FROM t2 )
AND d1.c1 IS NULL
ORDER BY d1.i1;
i1	c1
DROP TABLE t1, t2;
set big_tables=@big_tables_save;
set optimizer_switch=@optimizer_switch_save;
set @@read_rnd_buffer_size= @read_rnd_buffer_size_save;
set optimizer_switch=default;
