Bug #27531: 5.1 part of the fix

- Renamed "Using join cache" to "Using join buffer".
- "Using join buffer" is now printed on the last
  table that "reads" from the join buffer cache.


mysql-test/r/archive_gis.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/compress.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/ctype_utf8.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/derived.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/distinct.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/func_group.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/func_group_innodb.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/gis.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/greedy_optimizer.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/group_by.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/group_min_max.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/index_merge_myisam.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/information_schema.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/innodb_gis.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/innodb_mysql.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/join.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/join_nested.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/key_diff.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/myisam.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/ndb_condition_pushdown.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/ndb_gis.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/range.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/row.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/select.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/ssl.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/ssl_compress.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/subselect.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/subselect3.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/union.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
mysql-test/r/view.result:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.
sql/sql_select.cc:
  Bug #27531: renamed "Using join cache" to "Using join buffer"
  and moved to the last table in the batch.

mysql-test/r/archive_gis.result

@@ -402,8 +402,8 @@ Equals(g1.g, g2.g) as e, Disjoint(g1.g, g2.g) as d, Touches(g1.g, g2.g) as t,
 Intersects(g1.g, g2.g) as i, Crosses(g1.g, g2.g) as r
 FROM gis_geometrycollection g1, gis_geometrycollection g2 ORDER BY first, second;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort; Using join cache
-1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
+1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
 Warnings:
 Note	1003	select `test`.`g1`.`fid` AS `first`,`test`.`g2`.`fid` AS `second`,within(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `w`,contains(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `c`,overlaps(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `o`,equals(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `e`,disjoint(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `d`,touches(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `t`,intersects(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `i`,crosses(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `r` from `test`.`gis_geometrycollection` `g1` join `test`.`gis_geometrycollection` `g2` order by `test`.`g1`.`fid`,`test`.`g2`.`fid`
 DROP TABLE gis_point, gis_line, gis_polygon, gis_multi_point, gis_multi_line, gis_multi_polygon, gis_geometrycollection, gis_geometry;

mysql-test/r/compress.result

@@ -1434,8 +1434,8 @@ companynr	companynr
 41	40
 explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
+1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
 select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
 fld1	companynr	fld3	period
 038008	37	reporters	1008

mysql-test/r/ctype_utf8.result

@@ -1454,8 +1454,8 @@ insert into t1 values ('123'), ('456');
 explain
 select substr(Z.a,-1), Z.a from t1 as Y join t1 as Z on Y.a=Z.a order by 1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Y	ALL	NULL	NULL	NULL	NULL	2	Using temporary; Using filesort; Using join cache
-1	SIMPLE	Z	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	Y	ALL	NULL	NULL	NULL	NULL	2	Using temporary; Using filesort
+1	SIMPLE	Z	ALL	NULL	NULL	NULL	NULL	2	Using where; Using join buffer
 select substr(Z.a,-1), Z.a from t1 as Y join t1 as Z on Y.a=Z.a order by 1;
 substr(Z.a,-1)	a
 3	123

mysql-test/r/derived.result

@@ -57,8 +57,8 @@ a	b	a	b
 3	c	3	c
 explain select * from t1 as x1, (select * from t1) as x2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	x1	ALL	NULL	NULL	NULL	NULL	4	Using join cache
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	
+1	PRIMARY	x1	ALL	NULL	NULL	NULL	NULL	4	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	Using join buffer
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	
 drop table if exists  t2,t3;
 select * from (select 1) as a;
@@ -188,14 +188,14 @@ pla_id	test
 105	3
 explain SELECT STRAIGHT_JOIN d.pla_id, m2.mat_id FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	m2	ALL	NULL	NULL	NULL	NULL	9	Using join cache
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	PRIMARY	m2	ALL	NULL	NULL	NULL	NULL	9	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
 2	DERIVED	mp	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 2	DERIVED	m1	eq_ref	PRIMARY	PRIMARY	3	test.mp.mat_id	1	
 explain SELECT STRAIGHT_JOIN d.pla_id, m2.test FROM t1 m2  INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	m2	ALL	NULL	NULL	NULL	NULL	9	Using join cache
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	PRIMARY	m2	ALL	NULL	NULL	NULL	NULL	9	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
 2	DERIVED	mp	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 2	DERIVED	m1	eq_ref	PRIMARY	PRIMARY	3	test.mp.mat_id	1	
 drop table t1,t2;
@@ -245,8 +245,8 @@ a	a
 2	2
 explain select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	Using join cache
-1	PRIMARY	<derived4>	ALL	NULL	NULL	NULL	NULL	2	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
+1	PRIMARY	<derived4>	ALL	NULL	NULL	NULL	NULL	2	Using join buffer
 4	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	
 5	UNION	t1	ALL	NULL	NULL	NULL	NULL	2	
 NULL	UNION RESULT	<union4,5>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -312,8 +312,8 @@ b	3.5000
 explain SELECT s.name, AVG(s.val) AS median FROM (SELECT x.name, x.val FROM t1 x, t1 y WHERE x.name=y.name GROUP BY x.name, x.val HAVING SUM(y.val <= x.val) >= COUNT(*)/2 AND SUM(y.val >= x.val) >= COUNT(*)/2) AS s GROUP BY s.name;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	3	Using temporary; Using filesort
-2	DERIVED	x	ALL	NULL	NULL	NULL	NULL	17	Using temporary; Using filesort; Using join cache
-2	DERIVED	y	ALL	NULL	NULL	NULL	NULL	17	Using where
+2	DERIVED	x	ALL	NULL	NULL	NULL	NULL	17	Using temporary; Using filesort
+2	DERIVED	y	ALL	NULL	NULL	NULL	NULL	17	Using where; Using join buffer
 drop table t1;
 create table t2 (a int, b int, primary key (a));
 insert into t2 values (1,7),(2,7);

mysql-test/r/distinct.result

@@ -174,8 +174,8 @@ INSERT INTO t3 VALUES (1,'1'),(2,'2'),(1,'1'),(2,'2');
 explain SELECT distinct t3.a FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	4	Using temporary
-1	SIMPLE	t3	ref	a	a	5	test.t1.b	2	Using where; Using index; Using join cache
-1	SIMPLE	t2	index	a	a	4	NULL	5	Using where; Using index; Distinct
+1	SIMPLE	t3	ref	a	a	5	test.t1.b	2	Using where; Using index
+1	SIMPLE	t2	index	a	a	4	NULL	5	Using where; Using index; Distinct; Using join buffer
 SELECT distinct t3.a FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a;
 a
 1
@@ -299,12 +299,12 @@ WHERE
 ((t1.id=j_lj_t2.id AND t2_lj.id IS NULL) OR (t1.id=t2.id AND t2.idx=2))
 AND ((t1.id=j_lj_t3.id AND t3_lj.id IS NULL) OR (t1.id=t3.id AND t3.idx=2));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	index	id	id	4	NULL	2	Using index; Using temporary; Using join cache
-1	SIMPLE	t2	index	id	id	8	NULL	1	Using index; Distinct; Using join cache
-1	SIMPLE	t3	index	id	id	8	NULL	1	Using index; Distinct; Using join cache
-1	SIMPLE	j_lj_t2	index	id	id	4	NULL	2	Using where; Using index; Distinct
-1	SIMPLE	t2_lj	ref	id	id	4	test.j_lj_t2.id	1	Using where; Using index; Distinct; Using join cache
-1	SIMPLE	j_lj_t3	index	id	id	4	NULL	2	Using where; Using index; Distinct
+1	SIMPLE	t1	index	id	id	4	NULL	2	Using index; Using temporary
+1	SIMPLE	t2	index	id	id	8	NULL	1	Using index; Distinct; Using join buffer
+1	SIMPLE	t3	index	id	id	8	NULL	1	Using index; Distinct; Using join buffer
+1	SIMPLE	j_lj_t2	index	id	id	4	NULL	2	Using where; Using index; Distinct; Using join buffer
+1	SIMPLE	t2_lj	ref	id	id	4	test.j_lj_t2.id	1	Using where; Using index; Distinct
+1	SIMPLE	j_lj_t3	index	id	id	4	NULL	2	Using where; Using index; Distinct; Using join buffer
 1	SIMPLE	t3_lj	ref	id	id	4	test.j_lj_t3.id	1	Using where; Using index; Distinct
 SELECT DISTINCT
 t1.id
@@ -514,8 +514,8 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
 EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1_1	ALL	NULL	NULL	NULL	NULL	3	Using temporary; Using join cache
-1	SIMPLE	t1_2	index	NULL	PRIMARY	4	NULL	3	Using index; Distinct
+1	SIMPLE	t1_1	ALL	NULL	NULL	NULL	NULL	3	Using temporary
+1	SIMPLE	t1_2	index	NULL	PRIMARY	4	NULL	3	Using index; Distinct; Using join buffer
 EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2
 WHERE t1_1.a = t1_2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

mysql-test/r/func_group.result

@@ -613,8 +613,8 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 explain
 select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 > 'CA';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	k1	k1	7	NULL	1	Using where; Using index; Using join cache
-1	SIMPLE	t2	range	k1	k1	3	NULL	4	Using where; Using index
+1	SIMPLE	t1	range	k1	k1	7	NULL	1	Using where; Using index
+1	SIMPLE	t2	range	k1	k1	3	NULL	4	Using where; Using index; Using join buffer
 explain
 select min(a4 - 0.01) from t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -650,8 +650,8 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 explain
 select concat(min(t1.a1),min(t2.a4)) from t1, t2 where t2.a4 <> 'AME';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	range	k2	k2	4	NULL	6	Using where; Using index; Using join cache
-1	SIMPLE	t1	index	NULL	PRIMARY	3	NULL	15	Using index
+1	SIMPLE	t2	range	k2	k2	4	NULL	6	Using where; Using index
+1	SIMPLE	t1	index	NULL	PRIMARY	3	NULL	15	Using index; Using join buffer
 drop table t1, t2;
 create table t1 (a char(10));
 insert into t1 values ('a'),('b'),('c');

mysql-test/r/func_group_innodb.result

@@ -78,8 +78,8 @@ min(7)
 7
 explain select min(7) from t2i join t1i;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	Using join cache
-1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	
+1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	
+1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
 select min(7) from t2i join t1i;
 min(7)
 NULL
@@ -94,8 +94,8 @@ max(7)
 7
 explain select max(7) from t2i join t1i;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	Using join cache
-1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	
+1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	
+1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
 select max(7) from t2i join t1i;
 max(7)
 NULL

mysql-test/r/gis.result

@@ -394,8 +394,8 @@ Equals(g1.g, g2.g) as e, Disjoint(g1.g, g2.g) as d, Touches(g1.g, g2.g) as t,
 Intersects(g1.g, g2.g) as i, Crosses(g1.g, g2.g) as r
 FROM gis_geometrycollection g1, gis_geometrycollection g2 ORDER BY first, second;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort; Using join cache
-1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
+1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
 Warnings:
 Note	1003	select `test`.`g1`.`fid` AS `first`,`test`.`g2`.`fid` AS `second`,within(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `w`,contains(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `c`,overlaps(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `o`,equals(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `e`,disjoint(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `d`,touches(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `t`,intersects(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `i`,crosses(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `r` from `test`.`gis_geometrycollection` `g1` join `test`.`gis_geometrycollection` `g2` order by `test`.`g1`.`fid`,`test`.`g2`.`fid`
 DROP TABLE gis_point, gis_line, gis_polygon, gis_multi_point, gis_multi_line, gis_multi_polygon, gis_geometrycollection, gis_geometry;

mysql-test/r/greedy_optimizer.result

@@ -120,72 +120,72 @@ select @@optimizer_search_depth;
 63
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	821.837037
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	821.837037
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
 show status like 'Last_query_cost';
 Variable_name	Value
@@ -200,72 +200,72 @@ select @@optimizer_search_depth;
 0
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	821.837037
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	821.837037
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using join buffer
 1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.c21	1	Using where
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	289.418727
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using join buffer
 1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.c21	1	Using where
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	289.418727
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
 1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.c21	1	Using where
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	289.418727
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
 1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.c21	1	Using where
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
 show status like 'Last_query_cost';
 Variable_name	Value
@@ -276,24 +276,24 @@ select @@optimizer_search_depth;
 1
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	821.837037
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
@@ -303,10 +303,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
 1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
-1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
@@ -315,10 +315,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
 1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
-1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
@@ -327,10 +327,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	
 1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
-1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
@@ -339,10 +339,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	
 1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
-1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
@@ -352,72 +352,72 @@ select @@optimizer_search_depth;
 62
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	821.837037
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	821.837037
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using join buffer
 1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.c21	1	Using where
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	289.418727
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using join buffer
 1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.c21	1	Using where
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	289.418727
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
 1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.c21	1	Using where
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	289.418727
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
 1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.c21	1	Using where
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
 show status like 'Last_query_cost';
 Variable_name	Value
@@ -432,72 +432,72 @@ select @@optimizer_search_depth;
 0
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	821.837037
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	821.837037
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
 show status like 'Last_query_cost';
 Variable_name	Value
@@ -508,24 +508,24 @@ select @@optimizer_search_depth;
 1
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	821.837037
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
@@ -535,10 +535,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
 1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
-1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
@@ -547,10 +547,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
 1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
-1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
@@ -559,10 +559,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	
 1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
-1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
@@ -571,10 +571,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	
 1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
-1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
@@ -584,72 +584,72 @@ select @@optimizer_search_depth;
 62
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	821.837037
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.c22	1	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t4.c42	1	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t6.c62	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	821.837037
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
 show status like 'Last_query_cost';
 Variable_name	Value
 Last_query_cost	794.837037
 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where; Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where; Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
 show status like 'Last_query_cost';
 Variable_name	Value

mysql-test/r/group_by.result

@@ -536,12 +536,12 @@ a	b
 1	1
 explain select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary; Using filesort; Using join cache
-1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary; Using filesort
+1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
 explain select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b ORDER BY NULL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary; Using join cache
-1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary
+1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
 drop table t1,t2;
 create table t1 (a int, b int);
 insert into t1 values (1, 4),(10, 40),(1, 4),(10, 43),(1, 4),(10, 41),(1, 4),(10, 43),(1, 4);

mysql-test/r/group_min_max.result

@@ -2266,8 +2266,8 @@ EXPLAIN SELECT 1 FROM t1 AS t1_outer1 JOIN t1 AS t1_outer2
 ON t1_outer1.a = (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) 
 AND t1_outer1.b = t1_outer2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1_outer1	ref	a	a	5	const	1	Using where; Using index; Using join cache
-1	PRIMARY	t1_outer2	index	NULL	a	10	NULL	15	Using where; Using index
+1	PRIMARY	t1_outer1	ref	a	a	5	const	1	Using where; Using index
+1	PRIMARY	t1_outer2	index	NULL	a	10	NULL	15	Using where; Using index; Using join buffer
 2	SUBQUERY	t1	range	NULL	a	5	NULL	8	Using index for group-by
 EXPLAIN SELECT (SELECT (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) x
 FROM t1 AS t1_outer) x2 FROM t1 AS t1_outer2;

mysql-test/r/index_merge_myisam.result

@@ -270,8 +270,8 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 explain select * from t0,t1 where t0.key1 = 5 and
 (t1.key1 = t0.key1 or t1.key8 = t0.key1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	ref	i1	i1	4	const	1	Using join cache
-1	SIMPLE	t1	index_merge	i1,i8	i1,i8	4,4	NULL	2	Using union(i1,i8); Using where
+1	SIMPLE	t0	ref	i1	i1	4	const	1	
+1	SIMPLE	t1	index_merge	i1,i8	i1,i8	4,4	NULL	2	Using union(i1,i8); Using where; Using join buffer
 explain select * from t0,t1 where t0.key1 < 3 and
 (t1.key1 = t0.key1 or t1.key8 = t0.key1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -347,8 +347,8 @@ from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
 where (A.key1 < 500000 or A.key2 < 3)
 and   (B.key1 < 500000 or B.key2 < 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	A	index_merge	i1,i2	i1,i2	4,4	NULL	1013	Using sort_union(i1,i2); Using where; Using join cache
-1	SIMPLE	B	index_merge	i1,i2	i1,i2	4,4	NULL	1013	Using sort_union(i1,i2); Using where
+1	SIMPLE	A	index_merge	i1,i2	i1,i2	4,4	NULL	1013	Using sort_union(i1,i2); Using where
+1	SIMPLE	B	index_merge	i1,i2	i1,i2	4,4	NULL	1013	Using sort_union(i1,i2); Using where; Using join buffer
 select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
 from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
 where (A.key1 < 500000 or A.key2 < 3)
@@ -361,8 +361,8 @@ from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
 where (A.key1 = 1 or A.key2 = 1)
 and   (B.key1 = 1 or B.key2 = 1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	A	index_merge	i1,i2	i1,i2	4,4	NULL	1020	Using union(i1,i2); Using where; Using join cache
-1	SIMPLE	B	index_merge	i1,i2	i1,i2	4,4	NULL	1020	Using union(i1,i2); Using where
+1	SIMPLE	A	index_merge	i1,i2	i1,i2	4,4	NULL	1020	Using union(i1,i2); Using where
+1	SIMPLE	B	index_merge	i1,i2	i1,i2	4,4	NULL	1020	Using union(i1,i2); Using where; Using join buffer
 select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
 from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
 where (A.key1 = 1 or A.key2 = 1)
@@ -376,8 +376,8 @@ from t0 as A, t0 as B
 where (A.key1 = 1 and A.key2 = 1 and A.key3 = 1 and A.key4=1 and A.key5=1 and A.key6=1 and A.key7 = 1 or A.key8=1)
 and (B.key1 = 1 and B.key2 = 1 and B.key3 = 1 and B.key4=1 and B.key5=1 and B.key6=1 and B.key7 = 1 or B.key8=1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	A	index_merge	i1,i2,i3,i4,i5,i6,i7?,i8	i2,i3,i4,i5,i6,i7?,i8	X	NULL	#	Using union(intersect(i2,i3,i4,i5,i6,i7?),i8); Using where; Using join cache
-1	SIMPLE	B	index_merge	i1,i2,i3,i4,i5,i6,i7?,i8	i2,i3,i4,i5,i6,i7?,i8	X	NULL	#	Using union(intersect(i2,i3,i4,i5,i6,i7?),i8); Using where
+1	SIMPLE	A	index_merge	i1,i2,i3,i4,i5,i6,i7?,i8	i2,i3,i4,i5,i6,i7?,i8	X	NULL	#	Using union(intersect(i2,i3,i4,i5,i6,i7?),i8); Using where
+1	SIMPLE	B	index_merge	i1,i2,i3,i4,i5,i6,i7?,i8	i2,i3,i4,i5,i6,i7?,i8	X	NULL	#	Using union(intersect(i2,i3,i4,i5,i6,i7?),i8); Using where; Using join buffer
 select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
 from t0 as A, t0 as B
 where (A.key1 = 1 and A.key2 = 1 and A.key3 = 1 and A.key4=1 and A.key5=1 and A.key6=1 and A.key7 = 1 or A.key8=1)

mysql-test/r/information_schema.result

@@ -289,8 +289,8 @@ explain select a.ROUTINE_NAME from information_schema.ROUTINES a,
 information_schema.SCHEMATA b where
 a.ROUTINE_SCHEMA = b.SCHEMA_NAME;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	#	ALL	NULL	NULL	NULL	NULL	2	Using join cache
-1	SIMPLE	#	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	#	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	#	ALL	NULL	NULL	NULL	NULL	2	Using where; Using join buffer
 select a.ROUTINE_NAME, b.name from information_schema.ROUTINES a,
 mysql.proc b where a.ROUTINE_NAME = convert(b.name using utf8) order by 1;
 ROUTINE_NAME	name

mysql-test/r/innodb_gis.result

@@ -402,8 +402,8 @@ Equals(g1.g, g2.g) as e, Disjoint(g1.g, g2.g) as d, Touches(g1.g, g2.g) as t,
 Intersects(g1.g, g2.g) as i, Crosses(g1.g, g2.g) as r
 FROM gis_geometrycollection g1, gis_geometrycollection g2 ORDER BY first, second;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort; Using join cache
-1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
+1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
 Warnings:
 Note	1003	select `test`.`g1`.`fid` AS `first`,`test`.`g2`.`fid` AS `second`,within(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `w`,contains(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `c`,overlaps(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `o`,equals(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `e`,disjoint(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `d`,touches(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `t`,intersects(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `i`,crosses(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `r` from `test`.`gis_geometrycollection` `g1` join `test`.`gis_geometrycollection` `g2` order by `test`.`g1`.`fid`,`test`.`g2`.`fid`
 DROP TABLE gis_point, gis_line, gis_polygon, gis_multi_point, gis_multi_line, gis_multi_polygon, gis_geometrycollection, gis_geometry;

mysql-test/r/innodb_mysql.result

@@ -184,8 +184,8 @@ min(7)
 7
 explain select min(7) from t2i join t1i;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	Using join cache
-1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	
+1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	
+1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
 select min(7) from t2i join t1i;
 min(7)
 NULL
@@ -200,8 +200,8 @@ max(7)
 7
 explain select max(7) from t2i join t1i;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	Using join cache
-1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	
+1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	
+1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
 select max(7) from t2i join t1i;
 max(7)
 NULL

mysql-test/r/join.result

@@ -403,8 +403,8 @@ EXPLAIN
 SELECT STRAIGHT_JOIN t2.e FROM t1,t2 WHERE t2.d=1 AND t1.b=t2.e
 ORDER BY t1.b, t1.c;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	32	Using temporary; Using filesort; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	16	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	32	Using temporary; Using filesort
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	16	Using where; Using join buffer
 SELECT STRAIGHT_JOIN t2.e FROM t1,t2 WHERE t2.d=1 AND t1.b=t2.e
 ORDER BY t1.b, t1.c;
 e

mysql-test/r/join_nested.result

@@ -228,8 +228,8 @@ LEFT JOIN
 t8
 ON t7.b=t8.b AND t6.b < 10;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join cache
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using join buffer
 1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	
 Warnings:
 Note	1003	select `test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b` from `test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t7`.`b` = `test`.`t8`.`b`) and (`test`.`t6`.`b` < 10))) where 1
@@ -543,8 +543,8 @@ WHERE t0.a=1 AND
 t0.b=t1.b AND          
 (t2.a >= 4 OR t2.c IS NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join cache
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	
@@ -638,16 +638,16 @@ t0.b=t1.b AND
 (t8.b=t9.b OR t8.c IS NULL) AND
 (t9.a=1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join cache
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
-1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join cache
-1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
 Warnings:
 Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
 SELECT t9.a,t9.b
@@ -835,8 +835,8 @@ t2
 ON t3.a=1 AND t2.b=t4.b
 WHERE t1.a <= 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using join buffer
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	
 Warnings:
@@ -849,8 +849,8 @@ LEFT JOIN
 (t1,t2)
 ON t3.a=1 AND t3.b=t2.b AND t2.b=t4.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join cache
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
 1	SIMPLE	t2	ref	idx_b	idx_b	5	test.t3.b	2	100.00	
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
 Warnings:
@@ -905,16 +905,16 @@ t0.b=t1.b AND
 (t8.b=t9.b OR t8.c IS NULL) AND
 (t9.a=1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join cache
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
-1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join cache
-1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
 Warnings:
 Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
 CREATE INDEX idx_b ON t4(b);
@@ -955,16 +955,16 @@ t0.b=t1.b AND
 (t8.b=t9.b OR t8.c IS NULL) AND
 (t9.a=1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join cache
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	100.00	Using where
 1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	3	100.00	Using where
 1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
-1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join cache
-1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
 Warnings:
 Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
 CREATE INDEX idx_b ON t8(b);
@@ -1004,16 +1004,16 @@ t0.b=t1.b AND
 (t8.b=t9.b OR t8.c IS NULL) AND
 (t9.a=1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join cache
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	100.00	Using where
 1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	3	100.00	Using where
 1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
-1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t5.b	2	100.00	Using where; Using join cache
-1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t5.b	2	100.00	Using where
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
 Warnings:
 Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
 CREATE INDEX idx_b ON t1(b);
@@ -1062,8 +1062,8 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	3	100.00	Using where
 1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
-1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t5.b	2	100.00	Using where; Using join cache
-1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t5.b	2	100.00	Using where
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
 Warnings:
 Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
 SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,

mysql-test/r/key_diff.result

@@ -35,8 +35,8 @@ D	E	a	a
 a	a	a	a
 explain select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using join cache
-1	SIMPLE	t2	ALL	b	NULL	NULL	NULL	5	Using where
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	
+1	SIMPLE	t2	ALL	b	NULL	NULL	NULL	5	Using where; Using join buffer
 select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B order by binary t1.a,t2.a;
 a	b	a	b
 A	B	a	a

mysql-test/r/myisam.result

@@ -345,12 +345,12 @@ t1	1	c_2	1	c	A	5	NULL	NULL	YES	BTREE
 t1	1	c_2	2	a	A	5	NULL	NULL		BTREE	
 explain select * from t1,t2 where t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	2	Using join cache
-1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where
+1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	2	
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where; Using join buffer
 explain select * from t1,t2 force index(a) where t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	2	Using join cache
-1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where
+1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	2	
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where; Using join buffer
 explain select * from t1 force index(a),t2 force index(a) where t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	2	
@@ -361,8 +361,8 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	b	b	5	test.t2.b	1	Using where
 explain select * from t1,t2 force index(c) where t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using join cache
-1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where; Using join buffer
 explain select * from t1 where a=0 or a=2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where

mysql-test/r/ndb_condition_pushdown.result

@@ -1730,8 +1730,8 @@ pk1	attr1	attr2	attr3	attr4
 explain
 select * from t2,t3 where t2.attr1 < 1 and t2.attr2 = t3.attr2 and t3.attr1 < 5 order by t2.pk1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	#	Using where with pushed condition; Using temporary; Using filesort; Using join cache
-1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	#	Using where with pushed condition
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	#	Using where with pushed condition; Using temporary; Using filesort
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	#	Using where with pushed condition; Using join buffer
 select * from t2,t3 where t2.attr1 < 1 and t2.attr2 = t3.attr2 and t3.attr1 < 5 order by t2.pk1;
 pk1	attr1	attr2	attr3	pk1	attr1	attr2	attr3	attr4
 0	0	0	a	0	0	0	0	a
@@ -1746,8 +1746,8 @@ pk1	attr1	attr2	attr3	attr4
 explain
 select * from t3,t4 where t4.attr1 > 1 and t4.attr2 = t3.attr2 and t4.attr3 < 5 order by t4.pk1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	range	attr1	attr1	4	NULL	#	Using where with pushed condition; Using temporary; Using filesort; Using join cache
-1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	#	Using where
+1	SIMPLE	t4	range	attr1	attr1	4	NULL	#	Using where with pushed condition; Using temporary; Using filesort
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	#	Using where; Using join buffer
 select * from t3,t4 where t4.attr1 > 1 and t4.attr2 = t3.attr2 and t4.attr3 < 5 order by t4.pk1;
 pk1	attr1	attr2	attr3	attr4	pk1	attr1	attr2	attr3	attr4
 2	2	9223372036854775804	2	c	2	2	9223372036854775804	2	c

mysql-test/r/ndb_gis.result

@@ -402,8 +402,8 @@ Equals(g1.g, g2.g) as e, Disjoint(g1.g, g2.g) as d, Touches(g1.g, g2.g) as t,
 Intersects(g1.g, g2.g) as i, Crosses(g1.g, g2.g) as r
 FROM gis_geometrycollection g1, gis_geometrycollection g2 ORDER BY first, second;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort; Using join cache
-1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
+1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
 Warnings:
 Note	1003	select `test`.`g1`.`fid` AS `first`,`test`.`g2`.`fid` AS `second`,within(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `w`,contains(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `c`,overlaps(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `o`,equals(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `e`,disjoint(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `d`,touches(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `t`,intersects(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `i`,crosses(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `r` from `test`.`gis_geometrycollection` `g1` join `test`.`gis_geometrycollection` `g2` order by `test`.`g1`.`fid`,`test`.`g2`.`fid`
 DROP TABLE gis_point, gis_line, gis_polygon, gis_multi_point, gis_multi_line, gis_multi_polygon, gis_geometrycollection, gis_geometry;
@@ -952,8 +952,8 @@ Equals(g1.g, g2.g) as e, Disjoint(g1.g, g2.g) as d, Touches(g1.g, g2.g) as t,
 Intersects(g1.g, g2.g) as i, Crosses(g1.g, g2.g) as r
 FROM gis_geometrycollection g1, gis_geometrycollection g2 ORDER BY first, second;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort; Using join cache
-1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
+1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
 Warnings:
 Note	1003	select `test`.`g1`.`fid` AS `first`,`test`.`g2`.`fid` AS `second`,within(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `w`,contains(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `c`,overlaps(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `o`,equals(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `e`,disjoint(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `d`,touches(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `t`,intersects(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `i`,crosses(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `r` from `test`.`gis_geometrycollection` `g1` join `test`.`gis_geometrycollection` `g2` order by `test`.`g1`.`fid`,`test`.`g2`.`fid`
 DROP TABLE gis_point, gis_line, gis_polygon, gis_multi_point, gis_multi_line, gis_multi_polygon, gis_geometrycollection, gis_geometry;

mysql-test/r/range.result

@@ -220,28 +220,28 @@ insert into t1 (x) values (1),(2),(3),(4),(5),(6),(7),(8),(9);
 update t1 set y=x;
 explain select * from t1, t1 t2 where t1.y = 8 and t2.x between 7 and t1.y+0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ref	y	y	5	const	1	Using where; Using join cache
-1	SIMPLE	t2	range	x	x	5	NULL	2	Using where
+1	SIMPLE	t1	ref	y	y	5	const	1	Using where
+1	SIMPLE	t2	range	x	x	5	NULL	2	Using where; Using join buffer
 explain select * from t1, t1 t2 where t1.y = 8 and t2.x >= 7 and t2.x <= t1.y+0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ref	y	y	5	const	1	Using where; Using join cache
-1	SIMPLE	t2	range	x	x	5	NULL	2	Using where
+1	SIMPLE	t1	ref	y	y	5	const	1	Using where
+1	SIMPLE	t2	range	x	x	5	NULL	2	Using where; Using join buffer
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x between t1.y-1 and t1.y+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ref	y	y	5	const	1	Using where; Using join cache
-1	SIMPLE	t2	range	x	x	5	NULL	3	Using where
+1	SIMPLE	t1	ref	y	y	5	const	1	Using where
+1	SIMPLE	t2	range	x	x	5	NULL	3	Using where; Using join buffer
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x >= t1.y-1 and t2.x <= t1.y+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ref	y	y	5	const	1	Using where; Using join cache
-1	SIMPLE	t2	range	x	x	5	NULL	3	Using where
+1	SIMPLE	t1	ref	y	y	5	const	1	Using where
+1	SIMPLE	t2	range	x	x	5	NULL	3	Using where; Using join buffer
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x between 0 and t1.y;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ref	y	y	5	const	1	Using where; Using join cache
-1	SIMPLE	t2	range	x	x	5	NULL	2	Using where
+1	SIMPLE	t1	ref	y	y	5	const	1	Using where
+1	SIMPLE	t2	range	x	x	5	NULL	2	Using where; Using join buffer
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x >= 0 and t2.x <= t1.y;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ref	y	y	5	const	1	Using where; Using join cache
-1	SIMPLE	t2	range	x	x	5	NULL	2	Using where
+1	SIMPLE	t1	ref	y	y	5	const	1	Using where
+1	SIMPLE	t2	range	x	x	5	NULL	2	Using where; Using join buffer
 explain select count(*) from t1 where x in (1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	x	x	5	const	1	Using where; Using index
@@ -255,13 +255,13 @@ CREATE TABLE t2 (keya int(11) NOT NULL default '0', KEY j1 (keya));
 INSERT INTO t2 VALUES (0),(0),(1),(1),(2),(2);
 explain select * from t1, t2 where (t1.key1 <t2.keya + 1) and t2.keya=3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ref	j1	j1	4	const	1	Using index; Using join cache
-1	SIMPLE	t1	index	i1	i1	4	NULL	7	Using where; Using index
+1	SIMPLE	t2	ref	j1	j1	4	const	1	Using index
+1	SIMPLE	t1	index	i1	i1	4	NULL	7	Using where; Using index; Using join buffer
 explain select * from t1 force index(i1), t2 force index(j1) where 
 (t1.key1 <t2.keya + 1) and t2.keya=3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ref	j1	j1	4	const	1	Using index; Using join cache
-1	SIMPLE	t1	index	i1	i1	4	NULL	7	Using where; Using index
+1	SIMPLE	t2	ref	j1	j1	4	const	1	Using index
+1	SIMPLE	t1	index	i1	i1	4	NULL	7	Using where; Using index; Using join buffer
 DROP TABLE t1,t2;
 CREATE TABLE t1 (
 a int(11) default NULL,

mysql-test/r/row.result

@@ -376,8 +376,8 @@ a	b	a	b	c
 3	2	3	1	3
 EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t1.a-1,t1.b)=(t2.a-1,t2.b+1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	index	NULL	PRIMARY	8	NULL	6	100.00	Using index; Using join cache
-1	SIMPLE	t2	index	NULL	PRIMARY	12	NULL	7	100.00	Using where; Using index
+1	SIMPLE	t1	index	NULL	PRIMARY	8	NULL	6	100.00	Using index
+1	SIMPLE	t2	index	NULL	PRIMARY	12	NULL	7	100.00	Using where; Using index; Using join buffer
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where (((`test`.`t1`.`a` - 1) = (`test`.`t2`.`a` - 1)) and (`test`.`t1`.`b` = (`test`.`t2`.`b` + 1)))
 SELECT * FROM t1,t2 WHERE (t1.a-1,t1.b)=(t2.a-1,t2.b+1);

mysql-test/r/select.result

@@ -1430,8 +1430,8 @@ companynr	companynr
 41	40
 explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
+1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
 select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
 fld1	companynr	fld3	period
 038008	37	reporters	1008
@@ -2362,16 +2362,16 @@ insert into t1 values (1,2), (2,2), (3,2), (4,2);
 insert into t2 values (1,3), (2,3), (3,4), (4,4);
 explain select * from t1 left join t2 on a=c where d in (4);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ref	c,d	d	5	const	2	Using where; Using join cache
-1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t2	ref	c,d	d	5	const	2	Using where
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
 select * from t1 left join t2 on a=c where d in (4);
 a	b	c	d
 3	2	3	4
 4	2	4	4
 explain select * from t1 left join t2 on a=c where d = 4;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ref	c,d	d	5	const	2	Using where; Using join cache
-1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t2	ref	c,d	d	5	const	2	Using where
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
 select * from t1 left join t2 on a=c where d = 4;
 a	b	c	d
 3	2	3	4
@@ -2716,8 +2716,8 @@ explain select straight_join DISTINCT t2.a,t2.b, t1.c from t1, t3, t2
 where (t1.c=t2.a or (t1.c=t3.a and t2.a=t3.b)) and t1.b=556476786 and 
 t2.b like '%%' order by t2.b limit 0,1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ref	b,c	b	5	const	1	Using where; Using temporary; Using filesort; Using join cache
-1	SIMPLE	t3	index	PRIMARY,a,b	PRIMARY	8	NULL	2	Using index
+1	SIMPLE	t1	ref	b,c	b	5	const	1	Using where; Using temporary; Using filesort
+1	SIMPLE	t3	index	PRIMARY,a,b	PRIMARY	8	NULL	2	Using index; Using join buffer
 1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	2	Range checked for each record (index map: 0x1)
 DROP TABLE t1,t2,t3;
 CREATE TABLE t1 (a int, INDEX idx(a));
@@ -2737,8 +2737,8 @@ INSERT INTO t2 VALUES (1,NULL), (2,10);
 ALTER TABLE t1 ENABLE KEYS;
 EXPLAIN SELECT STRAIGHT_JOIN SQL_NO_CACHE COUNT(*) FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	index	b	b	5	NULL	2	Using index; Using join cache
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t2	index	b	b	5	NULL	2	Using index
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
 SELECT STRAIGHT_JOIN SQL_NO_CACHE * FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
 a	b	a	b
 1	NULL	1	1
@@ -2747,8 +2747,8 @@ a	b	a	b
 2	10	4	10
 EXPLAIN SELECT STRAIGHT_JOIN SQL_NO_CACHE COUNT(*) FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	index	b	b	5	NULL	2	Using index; Using join cache
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t2	index	b	b	5	NULL	2	Using index
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
 SELECT STRAIGHT_JOIN SQL_NO_CACHE * FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
 a	b	a	b
 1	NULL	1	1
@@ -2901,12 +2901,12 @@ a
 4
 EXPLAIN SELECT t1.a FROM t1 STRAIGHT_JOIN t2 ON t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
 EXPLAIN SELECT t1.a FROM t1 INNER JOIN t2 ON t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using join cache
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	Using where; Using join buffer
 DROP TABLE t1,t2;
 select x'10' + 0, X'10' + 0, b'10' + 0, B'10' + 0;
 x'10' + 0	X'10' + 0	b'10' + 0	B'10' + 0

mysql-test/r/ssl.result

@@ -1431,8 +1431,8 @@ companynr	companynr
 41	40
 explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
+1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
 select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
 fld1	companynr	fld3	period
 038008	37	reporters	1008

mysql-test/r/ssl_compress.result

@@ -1434,8 +1434,8 @@ companynr	companynr
 41	40
 explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary; Using join cache
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
+1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
 select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
 fld1	companynr	fld3	period
 038008	37	reporters	1008

mysql-test/r/subselect.result

@@ -904,8 +904,8 @@ a	t1.a in (select t2.a from t2,t3 where t3.a=t2.a)
 explain extended SELECT t1.a, t1.a in (select t2.a from t2,t3 where t3.a=t2.a) FROM t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	index	NULL	PRIMARY	4	NULL	4	100.00	Using index
-2	DEPENDENT SUBQUERY	t2	ref_or_null	a	a	5	func	2	100.00	Using where; Using index; Using join cache
-2	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+2	DEPENDENT SUBQUERY	t2	ref_or_null	a	a	5	func	2	100.00	Using where; Using index
+2	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,<in_optimizer>(`test`.`t1`.`a`,<exists>(select 1 AS `Not_used` from `test`.`t2` join `test`.`t3` where ((`test`.`t3`.`a` = `test`.`t2`.`a`) and ((<cache>(`test`.`t1`.`a`) = `test`.`t2`.`a`) or isnull(`test`.`t2`.`a`))) having <is_not_null_test>(`test`.`t2`.`a`))) AS `t1.a in (select t2.a from t2,t3 where t3.a=t2.a)` from `test`.`t1`
 drop table t1,t2,t3;
@@ -1354,8 +1354,8 @@ a
 explain extended select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	NULL	a	5	NULL	4	100.00	Using where; Using index
-2	DEPENDENT SUBQUERY	t1	ref	a	a	5	func	1001	100.00	Using where; Using index; Using join cache
-2	DEPENDENT SUBQUERY	t3	index	a	a	5	NULL	3	100.00	Using where; Using index
+2	DEPENDENT SUBQUERY	t1	ref	a	a	5	func	1001	100.00	Using where; Using index
+2	DEPENDENT SUBQUERY	t3	index	a	a	5	NULL	3	100.00	Using where; Using index; Using join buffer
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,<exists>(select 1 AS `Not_used` from `test`.`t1` join `test`.`t3` where ((`test`.`t3`.`a` = `test`.`t1`.`b`) and (<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`))))
 insert into t1 values (3,31);

mysql-test/r/subselect3.result

@@ -254,8 +254,8 @@ select a,b, oref,
 from t2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	
-2	DEPENDENT SUBQUERY	t1	ref_or_null	a	a	5	func	2	100.00	Using where; Full scan on NULL key; Using join cache
-2	DEPENDENT SUBQUERY	t4	ALL	NULL	NULL	NULL	NULL	100	100.00	Using where
+2	DEPENDENT SUBQUERY	t1	ref_or_null	a	a	5	func	2	100.00	Using where; Full scan on NULL key
+2	DEPENDENT SUBQUERY	t4	ALL	NULL	NULL	NULL	NULL	100	100.00	Using where; Using join buffer
 Warnings:
 Note	1276	Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
 Note	1003	select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`oref` AS `oref`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t4` where ((`test`.`t1`.`c` = `test`.`t2`.`oref`) and trigcond(((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`))) and trigcond(((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`b`) or isnull(`test`.`t1`.`b`)))) having (trigcond(<is_not_null_test>(`test`.`t1`.`a`)) and trigcond(<is_not_null_test>(`test`.`t1`.`b`))))) AS `Z` from `test`.`t2`

mysql-test/r/union.result

@@ -499,8 +499,8 @@ a	b
 explain (select * from t1 where a=1 and b=10) union (select straight_join t1.a,t2.a from t1,t2 where t1.a=t2.a);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
-2	UNION	t1	index	PRIMARY	PRIMARY	4	NULL	4	Using index; Using join cache
-2	UNION	t2	index	PRIMARY	PRIMARY	4	NULL	4	Using where; Using index
+2	UNION	t1	index	PRIMARY	PRIMARY	4	NULL	4	Using index
+2	UNION	t2	index	PRIMARY	PRIMARY	4	NULL	4	Using where; Using index; Using join buffer
 NULL	UNION RESULT	<union1,2>	ALL	NULL	NULL	NULL	NULL	NULL	
 explain (select * from t1 where a=1) union (select * from t1 where b=1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

mysql-test/r/view.result

@@ -2317,8 +2317,8 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ref	a	a	10	const,test.t1.b	2	Using where; Using index
 EXPLAIN SELECT * FROM v2 WHERE a=1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ref	a	a	5	const	1	Using where; Using index; Using join cache
-1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	ref	a	a	5	const	1	Using where; Using index
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
 DROP VIEW v1,v2;
 DROP TABLE t1,t2,t3;
 create table t1 (f1 int);

sql/sql_select.cc

@@ -15564,8 +15564,8 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
             break;
           }
         }
-        if (tab->next_select == sub_select_cache)
-          extra.append(STRING_WITH_LEN("; Using join cache"));
+        if (i > 0 && tab[-1].next_select == sub_select_cache)
+          extra.append(STRING_WITH_LEN("; Using join buffer"));
         
         /* Skip initial "; "*/
         const char *str= extra.ptr();