mariadb/mysql-test/main/func_isnull.result

drop table if exists t1;
create table t1 (id int auto_increment primary key not null, mydate date not null);
insert into t1 values (0,"2002-05-01"),(0,"2002-05-01"),(0,"2002-05-01");
flush tables;
select * from t1 where isnull(to_days(mydate));
id	mydate
drop table t1;
#
# Bug#53933 crash when using uncacheable subquery in the having clause of outer query
#
CREATE TABLE t1 (f1 INT);
INSERT INTO t1 VALUES (0),(0);
SELECT ISNULL((SELECT GET_LOCK('Bug#53933', 0) FROM t1 GROUP BY f1)) AS f2
FROM t1 GROUP BY f1 HAVING f2 = f2;
f2
0
SELECT RELEASE_LOCK('Bug#53933');
RELEASE_LOCK('Bug#53933')
1
DROP TABLE t1;
End of 5.0 tests
CREATE TABLE t1 (id INTEGER UNSIGNED NOT NULL AUTO_INCREMENT, PRIMARY KEY(id));
INSERT INTO t1( id ) VALUES ( NULL );
SELECT t1.id  FROM t1  WHERE (id  is not null and id is null );
id
DROP TABLE t1;
# End of 5.1 tests
#
# MDEV-14911: IS NULL for field from mergeable view
#
CREATE TABLE t1 (d1 datetime NOT NULL);
INSERT INTO t1 VALUES
('0000-00-00 00:00:00'), ('0000-00-00 00:00:00'), ('1979-09-03 20:49:36');
SELECT * FROM t1;
d1
0000-00-00 00:00:00
0000-00-00 00:00:00
1979-09-03 20:49:36
SELECT * FROM t1 WHERE d1 IS NULL;
d1
0000-00-00 00:00:00
0000-00-00 00:00:00
EXPLAIN EXTENDED SELECT * FROM t1 WHERE d1 IS NULL;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
Warnings:
Note	1003	select `test`.`t1`.`d1` AS `d1` from `test`.`t1` where `test`.`t1`.`d1` = 0
SELECT count(*) FROM t1 WHERE d1 IS NULL;
count(*)
2
CREATE VIEW v1 AS (SELECT * FROM t1);
SELECT * FROM v1;
d1
0000-00-00 00:00:00
0000-00-00 00:00:00
1979-09-03 20:49:36
SELECT * FROM v1 WHERE d1 IS NULL;
d1
0000-00-00 00:00:00
0000-00-00 00:00:00
EXPLAIN EXTENDED SELECT * FROM v1 WHERE d1 IS NULL;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
Warnings:
Note	1003	select `test`.`t1`.`d1` AS `d1` from `test`.`t1` where `test`.`t1`.`d1` = 0
SELECT count(*) FROM v1 WHERE d1 IS NULL;
count(*)
2
SET @save_optimizer_switch=@@optimizer_switch;
SET SESSION optimizer_switch='derived_merge=off';
SELECT count(*) FROM ( SELECT * FROM t1 ) AS a1 WHERE d1 IS NULL;
count(*)
2
SET SESSION optimizer_switch='derived_merge=on';
SELECT count(*) FROM ( SELECT * FROM t1 ) AS a1 WHERE d1 IS NULL;
count(*)
2
SET optimizer_switch=@save_optimizer_switch;
CREATE TABLE t2 (d1 datetime NOT NULL);
INSERT INTO t2 VALUES
('1980-09-03 20:49:36'),  ('0000-00-00 00:00:00'), ('1979-09-03 20:49:36');
SELECT * FROM t2 LEFT JOIN t1 ON t2.d1=t1.d1 WHERE t1.d1 IS NULL;
d1	d1
0000-00-00 00:00:00	0000-00-00 00:00:00
0000-00-00 00:00:00	0000-00-00 00:00:00
1980-09-03 20:49:36	NULL
EXPLAIN EXTENDED
SELECT * FROM t2 LEFT JOIN t1 ON t2.d1=t1.d1 WHERE t1.d1 IS NULL;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
Warnings:
Note	1003	select `test`.`t2`.`d1` AS `d1`,`test`.`t1`.`d1` AS `d1` from `test`.`t2` left join `test`.`t1` on(`test`.`t1`.`d1` = `test`.`t2`.`d1`) where `test`.`t1`.`d1` = 0 or `test`.`t1`.`d1` is null
SELECT * FROM t2 LEFT JOIN v1 ON t2.d1=v1.d1 WHERE v1.d1 IS NULL;
d1	d1
0000-00-00 00:00:00	0000-00-00 00:00:00
0000-00-00 00:00:00	0000-00-00 00:00:00
1980-09-03 20:49:36	NULL
EXPLAIN EXTENDED
SELECT * FROM t2 LEFT JOIN v1 ON t2.d1=v1.d1 WHERE v1.d1 IS NULL;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
Warnings:
Note	1003	select `test`.`t2`.`d1` AS `d1`,`test`.`t1`.`d1` AS `d1` from `test`.`t2` left join (`test`.`t1`) on(`test`.`t1`.`d1` = `test`.`t2`.`d1`) where `test`.`t1`.`d1` = 0 or `test`.`t1`.`d1` is null
DROP VIEW v1;
DROP TABLE t1,t2;
#
# MDEV-15475: Assertion `!table || (!table->read_set ||
# bitmap_is_set(table->read_set, field_index))'
# failed on EXPLAIN EXTENDED with constant table and view
#
CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=MyISAM;
CREATE VIEW v1 AS SELECT * FROM t1;
INSERT INTO t1 VALUES (1);
EXPLAIN EXTENDED SELECT ISNULL(pk) FROM v1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	100.00	
Warnings:
Note	1003	select /*always not null*/ 1 is null AS `ISNULL(pk)` from dual
EXPLAIN EXTENDED SELECT IFNULL(pk,0) FROM v1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	100.00	
Warnings:
Note	1003	select ifnull(1,0) AS `IFNULL(pk,0)` from dual
DROP VIEW v1;
DROP TABLE t1;
#
# End of 5.5 tests
#