Update test results.

mysql-test/r/subselect_mat.result

@@ -1861,6 +1861,24 @@ WHERE 'condition'='impossible'
 MIN(a)
 NULL
 DROP TABLE t1;
+#
+# BUG#938131: Subquery materialization is not used in CREATE TABLE SELECT
+# 
+CREATE TABLE t1(a int);
+INSERT INTO t1 values(1),(2);
+CREATE TABLE t2(a int);
+INSERT INTO t2 values(1),(2);
+# Should use Materialization:
+EXPLAIN SELECT * FROM t1 WHERE a IN (SELECT * FROM t2 GROUP BY a HAVING a > 1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+2	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	2	Using temporary
+flush status;
+CREATE TABLE t3 SELECT * FROM t1 WHERE a IN (SELECT * FROM t2 GROUP BY a HAVING a > 1);
+SHOW STATUS LIKE 'Created_tmp_tables';
+Variable_name	Value
+Created_tmp_tables	3
+DROP TABLE t1,t2,t3;
 # This must be at the end:
 set optimizer_switch=@subselect_sj_mat_tmp;
 set join_cache_level=@save_join_cache_level;