test for NULL processing has been added

mysql-test/r/heap_btree.result

@@ -213,6 +213,20 @@ a	b
 INSERT INTO t1 VALUES (1,3);
 Duplicate entry '3' for key 1
 DROP TABLE t1;
+CREATE TABLE t1 (a int, b int, c int, key using BTREE (a, b, c)) type=heap;
+INSERT INTO t1 VALUES (1, NULL, NULL), (1, 1, NULL), (1, NULL, 1);
+SELECT * FROM t1 WHERE a=1 and b IS NULL;
+a	b	c
+1	NULL	NULL
+1	NULL	1
+SELECT * FROM t1 WHERE a=1 and c IS NULL;
+a	b	c
+1	NULL	NULL
+1	1	NULL
+SELECT * FROM t1 WHERE a=1 and b IS NULL and c IS NULL;
+a	b	c
+1	NULL	NULL
+DROP TABLE t1;
 CREATE TABLE t1 (a int not null, primary key using BTREE (a)) type=heap;
 INSERT into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11);
 DELETE from t1 where a < 100;

mysql-test/t/heap_btree.test

@@ -137,6 +137,13 @@ SELECT * FROM t1 WHERE b<=>NULL;
 INSERT INTO t1 VALUES (1,3);
 DROP TABLE t1;
 
+CREATE TABLE t1 (a int, b int, c int, key using BTREE (a, b, c)) type=heap;
+INSERT INTO t1 VALUES (1, NULL, NULL), (1, 1, NULL), (1, NULL, 1);
+SELECT * FROM t1 WHERE a=1 and b IS NULL;
+SELECT * FROM t1 WHERE a=1 and c IS NULL;
+SELECT * FROM t1 WHERE a=1 and b IS NULL and c IS NULL;
+DROP TABLE t1;
+
 #
 # Test when deleting all rows
 #