1 files changed, 22 insertions, 0 deletions
diff --git a/mysql-test/t/heap.test b/mysql-test/t/heap.test
index abb9e1fd1bc..b08e8f6ea36 100644
--- a/mysql-test/t/heap.test
+++ b/mysql-test/t/heap.test
@@ -100,3 +100,25 @@ update t1 set new_col=btn;
 explain select * from t1 where btn="a";
 explain select * from t1 where btn="a" and new_col="a";
 drop table t1;
+
+#
+# Test of NULL keys
+#
+
+CREATE TABLE t1 (
+  a int default NULL,
+  b int default NULL,
+  KEY a (a),
+  UNIQUE b (b)
+) type=heap;
+INSERT INTO t1 VALUES (NULL,99),(99,NULL),(1,1),(2,2),(1,3);
+SELECT * FROM t1 WHERE a=NULL;
+explain SELECT * FROM t1 WHERE a IS NULL;
+SELECT * FROM t1 WHERE a<=>NULL;
+SELECT * FROM t1 WHERE b=NULL;
+explain SELECT * FROM t1 WHERE b IS NULL;
+SELECT * FROM t1 WHERE b<=>NULL;
+
+--error 1062
+INSERT INTO t1 VALUES (1,3);
+DROP TABLE t1;