#
# test of ISNULL()
#
--source include/default_optimizer_switch.inc

--disable_warnings
drop table if exists t1;
--enable_warnings

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));
drop table t1;

# End of 4.1 tests

--echo #
--echo # Bug#53933 crash when using uncacheable subquery in the having clause of outer query
--echo #

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;
SELECT RELEASE_LOCK('Bug#53933');

DROP TABLE t1;

--echo End of 5.0 tests

#
# Bug #41371    Select returns 1 row with condition "col is not null and col is null"
#

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 );
DROP TABLE t1;

--echo # End of 5.1 tests

--echo #
--echo # MDEV-14911: IS NULL for field from mergeable view
--echo #

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;
SELECT * FROM t1 WHERE d1 IS NULL;
EXPLAIN EXTENDED SELECT * FROM t1 WHERE d1 IS NULL;
SELECT count(*) FROM t1 WHERE d1 IS NULL;

CREATE VIEW v1 AS (SELECT * FROM t1);
SELECT * FROM v1;
SELECT * FROM v1 WHERE d1 IS NULL;
EXPLAIN EXTENDED SELECT * FROM v1 WHERE d1 IS NULL;
SELECT count(*) FROM v1 WHERE d1 IS NULL;

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;
SET SESSION optimizer_switch='derived_merge=on';
SELECT count(*) FROM ( SELECT * FROM t1 ) AS a1 WHERE d1 IS NULL;

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;
EXPLAIN EXTENDED
SELECT * FROM t2 LEFT JOIN t1 ON t2.d1=t1.d1 WHERE t1.d1 IS NULL;

SELECT * FROM t2 LEFT JOIN v1 ON t2.d1=v1.d1 WHERE v1.d1 IS NULL;
EXPLAIN EXTENDED
SELECT * FROM t2 LEFT JOIN v1 ON t2.d1=v1.d1 WHERE v1.d1 IS NULL;

DROP VIEW v1;
DROP TABLE t1,t2;


--echo #
--echo # MDEV-15475: Assertion `!table || (!table->read_set ||
--echo # bitmap_is_set(table->read_set, field_index))'
--echo # failed on EXPLAIN EXTENDED with constant table and view
--echo #

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;
EXPLAIN EXTENDED SELECT IFNULL(pk,0) FROM v1;
# Cleanup
DROP VIEW v1;
DROP TABLE t1;

--echo #
--echo # End of 5.5 tests
--echo #