MDEV-11078: NULL NOT IN (non-empty subquery) should never return results

Disabling the cond guards during the creation of Tricond Item for
constant and NULL left expression items

1 files changed, 19 insertions, 0 deletions

diff --git a/mysql-test/t/subselect4.test b/mysql-test/t/subselect4.test
index 7a7dd7e492e..056152cc706 100644
--- a/mysql-test/t/subselect4.test
+++ b/mysql-test/t/subselect4.test
@@ -2000,5 +2000,24 @@ EXECUTE stmt;
 
 drop table t1, t2, t3;
 
+--echo #
+--echo # MDEV-11078: NULL NOT IN (non-empty subquery) should never return results
+--echo #
+
+create table t1(a int,b int);
+create table t2(a int,b int);
+insert into t1 value (1,2);
+select (NULL)  in (select 1 from t1);
+select (null)  in (select 1 from t2);
+select 1 in (select 1 from t1);
+select 1 in (select 1 from t2);
+select 1 from dual where null in (select 1 from t1);
+select 1 from dual where null in (select 1 from t2);
+select (null,null) in (select * from t1);
+select (null,null) in (select * from t2);
+select 1 from dual where null not in (select 1 from t1);
+select 1 from dual where null not in (select 1 from t2);
+drop table t1,t2;
+
 SET optimizer_switch= @@global.optimizer_switch;
 set @@tmp_table_size= @@global.tmp_table_size;