results fixing

mysql-test/r/subselect.result

@@ -634,7 +634,7 @@ EXPLAIN SELECT * FROM t WHERE id IN (SELECT 1 UNION SELECT 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t	index	NULL	id	5	NULL	2	Using where; Using index
 2	DEPENDENT SUBSELECT	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-3	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+3	DEPENDENT UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 SELECT * FROM t WHERE id IN (SELECT 5 UNION SELECT 3);
 id
 SELECT * FROM t WHERE id IN (SELECT 5 UNION SELECT 2);