Merge

mysql-test/r/subselect4.result

@@ -1219,7 +1219,7 @@ EXPLAIN
 SELECT * FROM (t2 LEFT JOIN t1 ON t1.c1) LEFT JOIN t3 on t3.c1 WHERE 's' IN (SELECT c1 FROM t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	0	const row not found
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where; FirstMatch(t1)
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where; Start temporary; End temporary
 1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	Using where
 SELECT * FROM (t2 LEFT JOIN t1 ON t1.c1) LEFT JOIN t3 on t3.c1 WHERE 's' IN (SELECT c1 FROM t2);
@@ -1227,7 +1227,7 @@ c1	c1	c1
 EXPLAIN
 SELECT * FROM t4 LEFT JOIN t2 ON t4.c1 WHERE 's' IN (SELECT c1 FROM t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where; FirstMatch
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where; Start temporary; End temporary
 1	PRIMARY	t4	index	NULL	PRIMARY	3	NULL	2	Using index; Using join buffer (flat, BNL join)
 1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 SELECT * FROM t4 LEFT JOIN t2 ON t4.c1 WHERE 's' IN (SELECT c1 FROM t2);

mysql-test/r/subselect_sj.result

@@ -1457,8 +1457,8 @@ explain
 select * from t0 where a in (select t1.a from t1 left join t2 on t1.a=t2.a);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	4	Using where
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	1	Using where; FirstMatch(t0)
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	4	Using where; Start temporary
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	1	Using where; End temporary
 select * from t0 where a in (select t1.a from t1 left join t2 on t1.a=t2.a);
 a
 1

mysql-test/r/subselect_sj2.result

@@ -267,10 +267,10 @@ explain select *
 from t0 where a in
 (select t2.a+t3.a from t1 left join (t2 join t3) on t2.a=t1.a and t3.a=t1.a);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	10	
-1	PRIMARY	t1	index	NULL	a	5	NULL	10	Using index
+1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	10	Start temporary
+1	PRIMARY	t1	index	NULL	a	5	NULL	10	Using index; Using join buffer (flat, BNL join)
 1	PRIMARY	t2	ref	a	a	5	test.t1.a	1	Using where; Using index
-1	PRIMARY	t3	ref	a	a	5	test.t1.a	1	Using where; Using index; FirstMatch(t0)
+1	PRIMARY	t3	ref	a	a	5	test.t1.a	1	Using where; Using index; End temporary
 drop table t0, t1,t2,t3;
 CREATE TABLE t1 (
 ID int(11) NOT NULL auto_increment,

mysql-test/r/subselect_sj2_jcl6.result

@@ -275,10 +275,10 @@ explain select *
 from t0 where a in
 (select t2.a+t3.a from t1 left join (t2 join t3) on t2.a=t1.a and t3.a=t1.a);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	10	
+1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	10	Start temporary
 1	PRIMARY	t1	index	NULL	a	5	NULL	10	Using index; Using join buffer (flat, BNL join)
 1	PRIMARY	t2	ref	a	a	5	test.t1.a	1	Using where; Using index
-1	PRIMARY	t3	ref	a	a	5	test.t1.a	1	Using where; Using index; FirstMatch(t0)
+1	PRIMARY	t3	ref	a	a	5	test.t1.a	1	Using where; Using index; End temporary
 drop table t0, t1,t2,t3;
 CREATE TABLE t1 (
 ID int(11) NOT NULL auto_increment,

sql/opt_subselect.cc

@@ -2160,7 +2160,8 @@ void advance_sj_state(JOIN *join, table_map remaining_tables,
   table_map handled_by_fm_or_ls= 0;
   /* FirstMatch Strategy */
   if (new_join_tab->emb_sj_nest &&
-      optimizer_flag(join->thd, OPTIMIZER_SWITCH_FIRSTMATCH))
+      optimizer_flag(join->thd, OPTIMIZER_SWITCH_FIRSTMATCH) &&
+      !join->outer_join)
   {
     const table_map outer_corr_tables=
       new_join_tab->emb_sj_nest->nested_join->sj_corr_tables |
@@ -2255,7 +2256,7 @@ void advance_sj_state(JOIN *join, table_map remaining_tables,
       If we got an option to use LooseScan for the current table, start
       considering using LooseScan strategy
     */
-    if (loose_scan_pos->read_time != DBL_MAX)
+    if (loose_scan_pos->read_time != DBL_MAX && !join->outer_join)
     {
       pos->first_loosescan_table= idx;
       pos->loosescan_need_tables=