drop table if exists t1;
set @@session.sql_auto_is_null=1;
select {fn length("hello")}, { date "1997-10-20" };
{fn length("hello")}	1997-10-20
5	1997-10-20
create table t1 (a int not null auto_increment,b int not null,primary key (a,b));
insert into t1 SET A=NULL,B=1;
insert into t1 SET a=null,b=2;
select * from t1 where a is null and b=2;
a	b
select * from t1 where a is null;
a	b
2	2
analyze table t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
explain select * from t1 where b is null;
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
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where 0
drop table t1;
CREATE TABLE t1 (a INT AUTO_INCREMENT PRIMARY KEY);
INSERT INTO t1 VALUES (NULL);
SELECT sql_no_cache a, last_insert_id() FROM t1 WHERE a IS NULL;
a	last_insert_id()
1	1
Warnings:
Warning	1681	'SQL_NO_CACHE' is deprecated and will be removed in a future release.
SELECT sql_no_cache a, last_insert_id() FROM t1 WHERE a IS NULL;
a	last_insert_id()
Warnings:
Warning	1681	'SQL_NO_CACHE' is deprecated and will be removed in a future release.
SELECT sql_no_cache a, last_insert_id() FROM t1;
a	last_insert_id()
1	1
Warnings:
Warning	1681	'SQL_NO_CACHE' is deprecated and will be removed in a future release.
DROP TABLE t1;
set @@session.sql_auto_is_null=default;
