diff options
Diffstat (limited to 'mysql-test/t/func_isnull.test')
| -rw-r--r-- | mysql-test/t/func_isnull.test | 48 |
1 files changed, 47 insertions, 1 deletions
diff --git a/mysql-test/t/func_isnull.test b/mysql-test/t/func_isnull.test index 326574e0515..4c59fa3cbe8 100644 --- a/mysql-test/t/func_isnull.test +++ b/mysql-test/t/func_isnull.test @@ -38,5 +38,51 @@ INSERT INTO t1( id ) VALUES ( NULL ); SELECT t1.id FROM t1 WHERE (id is not null and id is null ); DROP TABLE t1; -# End of 5.1 tests +--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 # End of 5.5 tests +--echo # |