Update matching_candidates_in_table() to treat all conditions similar

Fixed also that the 'with_found_constraint parameter' to
matching_candidates_in_table() is as documented: It is now true only
if there is a reference to a previous table in the WHERE condition for
the current examined table (as it was originally documented)

Changes in test results:
- Filtered was 25% smaller for some queries (expected).
- Some join order changed (probably because the tables had very few rows).
- Some more table scans, probably because there would be fewer returned
  rows.
- Some tests exposes a bug that if there is more filtered rows, then the
  cost for table scan will be higher. This will be fixed in a later commit.

mysql-test/main/cte_recursive.result

@@ -3260,10 +3260,10 @@ ORDER BY path;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	15	Using filesort
 2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	15	Using where
-3	RECURSIVE UNION	t2	ALL	NULL	NULL	NULL	NULL	15	Using where
+3	RECURSIVE UNION	t2	ALL	NULL	NULL	NULL	NULL	15	
-3	RECURSIVE UNION	<derived2>	ref	key0	key0	5	test.t2.id	2	
+3	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	15	Using where; Using join buffer (flat, BNL join)
-4	RECURSIVE UNION	t2	ALL	NULL	NULL	NULL	NULL	15	Using where
+4	RECURSIVE UNION	t2	ALL	NULL	NULL	NULL	NULL	15	
-4	RECURSIVE UNION	<derived2>	ref	key0	key0	5	test.t2.id	2	
+4	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	15	Using where; Using join buffer (flat, BNL join)
 NULL	UNION RESULT	<union2,3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
 DROP TABLE t1,t2;
 set tmp_memory_table_size=default;
@@ -4467,8 +4467,8 @@ NULL	UNION RESULT	<union4,5>	ALL	NULL	NULL	NULL	NULL	NULL
 3	DERIVED	v	ALL	NULL	NULL	NULL	NULL	12	Using where
 3	DERIVED	h	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 3	DERIVED	w	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (incremental, BNL join)
-2	RECURSIVE UNION	<derived4>	ALL	NULL	NULL	NULL	NULL	2	
+2	RECURSIVE UNION	h	ALL	NULL	NULL	NULL	NULL	12	
-2	RECURSIVE UNION	h	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
+2	RECURSIVE UNION	<derived4>	ALL	NULL	NULL	NULL	NULL	2	Using where; Using join buffer (flat, BNL join)
 2	RECURSIVE UNION	w	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (incremental, BNL join)
 NULL	UNION RESULT	<union3,2>	ALL	NULL	NULL	NULL	NULL	NULL	
 prepare stmt from "with recursive
@@ -4566,8 +4566,8 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 5	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
 NULL	UNION RESULT	<union3,4,5>	ALL	NULL	NULL	NULL	NULL	NULL	
 2	DERIVED	h	ALL	NULL	NULL	NULL	NULL	12	
-2	DERIVED	w	ALL	NULL	NULL	NULL	NULL	12	Using join buffer (flat, BNL join)
+2	DERIVED	<derived3>	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
-2	DERIVED	<derived3>	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (incremental, BNL join)
+2	DERIVED	w	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (incremental, BNL join)
 prepare stmt from "with recursive
 ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
 w_id, w_name, w_dob, w_father, w_mother)

mysql-test/main/delete.result

@@ -205,13 +205,13 @@ insert into t3 values (1,1),(2,1),(1,3);
 select * from t1,t2,t3 where t1.a=t2.a AND t2.b=t3.a and t1.b=t3.b;
 a	b	a	b	a	b
 1	1	1	1	1	1
-2	1	2	2	2	1
 1	3	1	1	1	3
+2	1	2	2	2	1
 explain select * from t1,t2,t3 where t1.a=t2.a AND t2.b=t3.a and t1.b=t3.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
-1	SIMPLE	t2	ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using index
+1	SIMPLE	t2	index	PRIMARY	PRIMARY	8	NULL	3	Using where; Using index; Using join buffer (flat, BNL join)
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	8	test.t2.b,test.t1.b	1	Using index
+1	SIMPLE	t3	index	PRIMARY	PRIMARY	8	NULL	3	Using where; Using index; Using join buffer (incremental, BNL join)
 delete t2.*,t3.* from t1,t2,t3 where t1.a=t2.a AND t2.b=t3.a and t1.b=t3.b;
 select * from t3;
 a	b

mysql-test/main/derived_view.result

@@ -2044,16 +2044,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	2	
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using join buffer (flat, BNL join)
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using join buffer (flat, BNL join)
-1	SIMPLE	t3	ref	e	e	3	test.t2.d	1	Using index
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	5	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t3	index	e	e	7	NULL	8	Using where; Using index; Using join buffer (flat, BNL join)
 SELECT t2.d FROM t1,t2,v3 WHERE v3.e = t2.d AND v3.i < 3;
 d
-w
-w
-w
-w
-w
-w
 d
 d
 d
@@ -2072,6 +2066,12 @@ e
 e
 e
 e
+w
+w
+w
+w
+w
+w
 SET SESSION join_cache_level = @exit_join_cache_level;
 SET SESSION join_buffer_size = @exit_join_buffer_size;
 DROP VIEW v3;
@@ -2459,6 +2459,8 @@ SELECT * FROM t1;
 a
 1
 1
+1
+1
 drop table t1,t2;
 set optimizer_switch=@save968720_optimizer_switch;
 #
@@ -2595,8 +2597,8 @@ CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
 EXPLAIN EXTENDED 
 SELECT v1.c1, v1.c2 FROM v1, t2 WHERE v1.c1=t2.c1 AND v1.c2=t2.c2;
 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	Using where
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	<derived2>	ref	key0	key0	5	test.t2.c2	2	100.00	Using where
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	5	75.00	Using where; Using join buffer (flat, BNL join)
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	5	100.00	
 Warnings:
 Note	1003	/* select#1 */ select `v1`.`c1` AS `c1`,`v1`.`c2` AS `c2` from `test`.`v1` join `test`.`t2` where `v1`.`c1` = `test`.`t2`.`c1` and `v1`.`c2` = `test`.`t2`.`c2`
@@ -2608,8 +2610,8 @@ EXPLAIN EXTENDED
 SELECT t2.c1, t2.c2 FROM (SELECT c1 g, MAX(c2) m FROM t1 GROUP BY c1) t, t2
 WHERE t.g=t2.c1 AND t.m=t2.c2;
 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	Using where
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	<derived2>	ref	key0	key0	5	test.t2.c2	2	100.00	Using where
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	5	75.00	Using where; Using join buffer (flat, BNL join)
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	5	100.00	Using temporary; Using filesort
 Warnings:
 Note	1003	/* select#1 */ select `test`.`t2`.`c1` AS `c1`,`test`.`t2`.`c2` AS `c2` from (/* select#2 */ select `test`.`t1`.`c1` AS `g`,max(`test`.`t1`.`c2`) AS `m` from `test`.`t1` group by `test`.`t1`.`c1`) `t` join `test`.`t2` where `t`.`g` = `test`.`t2`.`c1` and `t`.`m` = `test`.`t2`.`c2`

mysql-test/main/distinct.result

@@ -173,9 +173,9 @@ INSERT INTO t2 values (1),(2),(3);
 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	t2	index	a	a	4	NULL	5	Using index; Using temporary
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	4	Using where; Using temporary
-1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using where
 1	SIMPLE	t3	ref	a	a	5	test.t1.b	2	Using index
+1	SIMPLE	t2	index	a	a	4	NULL	5	Using where; Using index; Using join buffer (flat, BNL join)
 SELECT distinct t3.a FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a;
 a
 1
@@ -523,7 +523,7 @@ 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
 1	SIMPLE	t1_1	ALL	PRIMARY	NULL	NULL	NULL	3	Using temporary
-1	SIMPLE	t1_2	eq_ref	PRIMARY	PRIMARY	4	test.t1_1.a	1	Using index; Distinct
+1	SIMPLE	t1_2	index	PRIMARY	PRIMARY	4	NULL	3	Using where; Using index; Using join buffer (flat, BNL join)
 EXPLAIN SELECT a FROM t1 GROUP BY a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	index	NULL	PRIMARY	4	NULL	3	Using index

mysql-test/main/greedy_optimizer.result

@@ -142,52 +142,52 @@ Variable_name	Value
 Last_query_cost	1693.637037
 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 where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 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
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
 show status like 'Last_query_cost';
 Variable_name	Value
-Last_query_cost	844.037037
+Last_query_cost	642.737037
 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 where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
 1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using index
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using index
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
 show status like 'Last_query_cost';
 Variable_name	Value
-Last_query_cost	844.037037
+Last_query_cost	642.737037
 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 where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
+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
 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 (flat, BNL join)
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
 show status like 'Last_query_cost';
 Variable_name	Value
-Last_query_cost	844.037037
+Last_query_cost	642.737037
 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 where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
-1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
 1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	Using where
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
 show status like 'Last_query_cost';
 Variable_name	Value
-Last_query_cost	844.037037
+Last_query_cost	642.737037
 set optimizer_prune_level=0;
 select @@optimizer_prune_level;
 @@optimizer_prune_level
@@ -454,52 +454,52 @@ Variable_name	Value
 Last_query_cost	1693.637037
 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 where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 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
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
 show status like 'Last_query_cost';
 Variable_name	Value
-Last_query_cost	844.037037
+Last_query_cost	642.737037
 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 where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
-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	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
+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 (flat, BNL join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
 show status like 'Last_query_cost';
 Variable_name	Value
-Last_query_cost	844.037037
+Last_query_cost	642.737037
 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 where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
-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
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
-show status like 'Last_query_cost';
-Variable_name	Value
-Last_query_cost	844.037037
-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 where
-1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	
 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
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
 show status like 'Last_query_cost';
 Variable_name	Value
-Last_query_cost	844.037037
+Last_query_cost	642.737037
+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	
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
+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 (flat, BNL join)
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
+show status like 'Last_query_cost';
+Variable_name	Value
+Last_query_cost	642.737037
 set optimizer_search_depth=1;
 select @@optimizer_search_depth;
 @@optimizer_search_depth
@@ -606,52 +606,52 @@ Variable_name	Value
 Last_query_cost	1693.637037
 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 where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 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
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
 show status like 'Last_query_cost';
 Variable_name	Value
-Last_query_cost	844.037037
+Last_query_cost	642.737037
 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 where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using index
-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	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
+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 (flat, BNL join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
 show status like 'Last_query_cost';
 Variable_name	Value
-Last_query_cost	844.037037
+Last_query_cost	642.737037
 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 where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.c12	1	
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
-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
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
-1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
-show status like 'Last_query_cost';
-Variable_name	Value
-Last_query_cost	844.037037
-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 where
-1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	
 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
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
 show status like 'Last_query_cost';
 Variable_name	Value
-Last_query_cost	844.037037
+Last_query_cost	642.737037
+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	
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t7	eq_ref	PRIMARY	PRIMARY	4	test.t1.c16	1	Using where
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.c14	1	Using where
+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 (flat, BNL join)
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
+show status like 'Last_query_cost';
+Variable_name	Value
+Last_query_cost	642.737037
 drop table t1,t2,t3,t4,t5,t6,t7;
 CREATE TABLE t1 (a int, b int, d int, i int);
 INSERT INTO t1 VALUES (1,1,1,1);

mysql-test/main/group_by.result

@@ -552,12 +552,12 @@ a	b
 3	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	t2	ALL	a	NULL	NULL	NULL	4	Using temporary; Using filesort
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary; Using filesort
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer (flat, BNL join)
 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	t2	ALL	a	NULL	NULL	NULL	4	Using temporary
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer (flat, BNL join)
 drop table t1,t2;
 SET @@optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity,@@optimizer_switch=@save_optimizer_switch;
 create table t1 (a int, b int);

mysql-test/main/join.result

@@ -258,7 +258,7 @@ name varchar(255) default NULL,
 PRIMARY KEY  (id)
 ) ENGINE=MyISAM;
 INSERT INTO t2 VALUES (1,'s1'),(2,'s2'),(3,'s3'),(4,'s4'),(5,'s5');
-select t1.*, t2.*  from t1, t2 where t2.id=t1.t2_id limit 2;
+select straight_join t1.*, t2.*  from t2, t1 where t2.id=t1.t2_id limit 2;
 t1_id	t2_id	type	cost_unit	min_value	max_value	t3_id	item_id	id	name
 12	5	Percent	Cost	-1	0	-1	-1	5	s5
 14	4	Percent	Cost	-1	0	-1	-1	4	s4

mysql-test/main/join.test

@@ -253,7 +253,7 @@ CREATE TABLE t2 (
   PRIMARY KEY  (id)
 ) ENGINE=MyISAM;
 INSERT INTO t2 VALUES (1,'s1'),(2,'s2'),(3,'s3'),(4,'s4'),(5,'s5');
-select t1.*, t2.*  from t1, t2 where t2.id=t1.t2_id limit 2;
+select straight_join t1.*, t2.*  from t2, t1 where t2.id=t1.t2_id limit 2;
 drop table t1,t2;
 
 #

mysql-test/main/join_cache.result

@@ -3071,11 +3071,11 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.metaid	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t7	ref	PRIMARY	PRIMARY	4	test.t1.metaid	1	Using index
 1	SIMPLE	t8	eq_ref	PRIMARY	PRIMARY	4	test.t7.artistid	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t3	ref	t3_metaid,t3_formatid,t3_metaidformatid	t3_metaidformatid	4	test.t1.metaid	1	Using index condition; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t4	eq_ref	PRIMARY,t4_formatclassid,t4_formats_idx	PRIMARY	4	test.t3.formatid	1	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t9	index	PRIMARY,t9_subgenreid,t9_metaid	PRIMARY	8	NULL	2	Using where; Using index; Using join buffer (incremental, BNL join)
 1	SIMPLE	t10	eq_ref	PRIMARY,t10_genreid	PRIMARY	4	test.t9.subgenreid	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t11	eq_ref	PRIMARY	PRIMARY	4	test.t10.genreid	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+1	SIMPLE	t3	ref	t3_metaid,t3_formatid,t3_metaidformatid	t3_metaidformatid	4	test.t1.metaid	1	Using index condition; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+1	SIMPLE	t4	eq_ref	PRIMARY,t4_formatclassid,t4_formats_idx	PRIMARY	4	test.t3.formatid	1	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 SELECT t1.uniquekey, t1.xml AS affiliateXml,
 t8.name AS artistName, t8.artistid, 
 t11.name AS genreName, t11.genreid, t11.priority AS genrePriority,
@@ -4507,8 +4507,8 @@ SET SESSION join_buffer_size = 256;
 EXPLAIN
 SELECT t1.a, t2.c FROM t1,t2 WHERE t1.a=t2.a AND t2.b=99;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	idx	NULL	NULL	NULL	15	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	36	
-1	SIMPLE	t1	hash_ALL	NULL	#hash#$hj	5	test.t2.a	36	Using where; Using join buffer (flat, BNLH join)
+1	SIMPLE	t2	ALL	idx	NULL	NULL	NULL	15	Using where; Using join buffer (flat, BNL join)
 SELECT t1.a, t2.c FROM t1,t2 WHERE t1.a=t2.a AND t2.b=99;
 a	c
 SET SESSION join_cache_level=@save_join_cache_level;

mysql-test/main/join_nested.result

@@ -1064,7 +1064,7 @@ t0.b=t1.b AND
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	t0	ref	idx_a	idx_a	5	const	2	100.00	
 1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
-1	SIMPLE	t1	ALL	idx_b	NULL	NULL	NULL	7	100.00	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t1	ALL	idx_b	NULL	NULL	NULL	7	75.00	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	7	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

mysql-test/main/join_nested_jcl6.result

@@ -1073,7 +1073,7 @@ t0.b=t1.b AND
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	t0	ref	idx_a	idx_a	5	const	2	100.00	
 1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
-1	SIMPLE	t1	ALL	idx_b	NULL	NULL	NULL	7	100.00	Using where; Using join buffer (incremental, BNL join)
+1	SIMPLE	t1	ALL	idx_b	NULL	NULL	NULL	7	75.00	Using where; Using join buffer (incremental, BNL join)
 1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	7	100.00	Using where; Using join buffer (incremental, BNL join)
 1	SIMPLE	t7	hash_ALL	NULL	#hash#$hj	5	test.t5.b	2	100.00	Using where; Using join buffer (incremental, BNLH join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (incremental, BNL join)
@@ -2120,9 +2120,9 @@ FROM t5 LEFT JOIN
 ON (t5.b=t8.b);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	2	
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (flat, BNL join)
+1	SIMPLE	t8	ALL	b_i	NULL	NULL	NULL	1	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (incremental, BNL join)
 1	SIMPLE	t7	const	PRIMARY	PRIMARY	4	const	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t8	ALL	b_i	NULL	NULL	NULL	1	Using where; Using join buffer (incremental, BNL join)
 SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
 FROM t5 LEFT JOIN                
 (t6 LEFT JOIN t7 ON t7.a=1, t8)
@@ -2137,9 +2137,9 @@ FROM t5 LEFT JOIN
 ON (t5.b=t8.b);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	2	
-1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (flat, BNL join)
+1	SIMPLE	t8	ALL	b_i	NULL	NULL	NULL	1	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (incremental, BNL join)
 1	SIMPLE	t7	ref	b_i	b_i	5	const	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t8	ALL	b_i	NULL	NULL	NULL	1	Using where; Using join buffer (incremental, BNL join)
 SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
 FROM t5 LEFT JOIN                
 (t6 LEFT JOIN t7 ON t7.b=2, t8)

mysql-test/main/limit_rows_examined.result

@@ -49,11 +49,10 @@ explain
 select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 6;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1i	index	PRIMARY	PRIMARY	2	NULL	4	Using index
-1	SIMPLE	t2i	eq_ref	PRIMARY	PRIMARY	2	test.t1i.c1	1	Using index
+1	SIMPLE	t2i	index	PRIMARY	PRIMARY	2	NULL	4	Using where; Using index; Using join buffer (flat, BNL join)
 select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 6;
 c1	c2
 bb	bb
-cc	cc
 Warnings:
 Warning	1931	Query execution was interrupted. The query examined at least 7 rows, which exceeds LIMIT ROWS EXAMINED (6). The query result may be incomplete
 set @@join_cache_level=6;
@@ -70,11 +69,10 @@ explain
 select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 6;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1i	index	PRIMARY	PRIMARY	2	NULL	4	Using index
-1	SIMPLE	t2i	eq_ref	PRIMARY	PRIMARY	2	test.t1i.c1	1	Using index
+1	SIMPLE	t2i	index	PRIMARY	PRIMARY	2	NULL	4	Using where; Using index; Using join buffer (flat, BNL join)
 select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 6;
 c1	c2
 bb	bb
-cc	cc
 Warnings:
 Warning	1931	Query execution was interrupted. The query examined at least 7 rows, which exceeds LIMIT ROWS EXAMINED (6). The query result may be incomplete
 Mix LIMIT ROWS EXAMINED with LIMIT

mysql-test/main/multi_update.result

@@ -1092,8 +1092,8 @@ a	b	c	a	b	c
 set optimizer_switch='firstmatch=off';
 explain update t1, t2 set t2.c=1 where t1.a=t2.a and t1.b in (select b from t3 where t3.c< t2.c) order by t2.c, t1.c limit 10;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	10	Using where; Using temporary; Using filesort
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	10	Using temporary; Using filesort
-1	PRIMARY	t1	ref	a	a	5	test.t2.a	1	
+1	PRIMARY	t1	ALL	a	NULL	NULL	NULL	10	Using where
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	10	Using where; Start temporary; End temporary
 update t1, t2 set t2.c=1 where t1.a=t2.a and t1.b in (select b from t3 where t3.c<=t2.c) order by t2.c, t1.c limit 5;
 select * from t2;

mysql-test/main/myisam_explain_non_select_all.result

@@ -932,15 +932,15 @@ Warning	1287	'<select expression> INTO <destination>;' is deprecated and will be
 EXPLAIN DELETE t1,t2,t3 FROM t1,t2,t3 WHERE a1=a2 AND b2=a3 AND b1=b3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
-1	SIMPLE	t2	ref	PRIMARY	PRIMARY	4	test.t1.a1	1	
+1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	3	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	8	test.t2.b2,test.t1.b1	1	
+1	SIMPLE	t3	ALL	PRIMARY	NULL	NULL	NULL	3	Using where
 FLUSH STATUS;
 FLUSH TABLES;
 EXPLAIN EXTENDED DELETE t1,t2,t3 FROM t1,t2,t3 WHERE a1=a2 AND b2=a3 AND b1=b3;
 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	
-1	SIMPLE	t2	ref	PRIMARY	PRIMARY	4	test.t1.a1	1	100.00	
+1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	3	75.00	Using where
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	8	test.t2.b2,test.t1.b1	1	100.00	
+1	SIMPLE	t3	ALL	PRIMARY	NULL	NULL	NULL	3	75.00	Using where
 # Status of EXPLAIN EXTENDED query
 Variable_name	Value
 Handler_read_key	13
@@ -949,8 +949,8 @@ FLUSH TABLES;
 EXPLAIN EXTENDED SELECT *        FROM t1,t2,t3 WHERE a1=a2 AND b2=a3 AND b1=b3;
 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	
-1	SIMPLE	t2	ref	PRIMARY	PRIMARY	4	test.t1.a1	1	100.00	Using index
+1	SIMPLE	t2	index	PRIMARY	PRIMARY	8	NULL	3	75.00	Using where; Using index; Using join buffer (flat, BNL join)
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	8	test.t2.b2,test.t1.b1	1	100.00	Using index
+1	SIMPLE	t3	index	PRIMARY	PRIMARY	8	NULL	3	75.00	Using where; Using index; Using join buffer (incremental, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`b1` AS `b1`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`b2` AS `b2`,`test`.`t3`.`a3` AS `a3`,`test`.`t3`.`b3` AS `b3` from `test`.`t1` join `test`.`t2` join `test`.`t3` where `test`.`t2`.`a2` = `test`.`t1`.`a1` and `test`.`t3`.`a3` = `test`.`t2`.`b2` and `test`.`t3`.`b3` = `test`.`t1`.`b1`
 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution
@@ -960,16 +960,16 @@ Warnings:
 Warning	1287	'<select expression> INTO <destination>;' is deprecated and will be removed in a future release. Please use 'SELECT <select list> INTO <destination> FROM...' instead
 # Status of "equivalent" SELECT query execution:
 Variable_name	Value
-Handler_read_key	19
+Handler_read_first	2
-Handler_read_next	3
+Handler_read_key	13
+Handler_read_next	6
 Handler_read_rnd_next	4
 # Status of testing query execution:
 Variable_name	Value
 Handler_delete	8
-Handler_read_key	19
+Handler_read_key	13
-Handler_read_next	3
 Handler_read_rnd	5
-Handler_read_rnd_next	4
+Handler_read_rnd_next	28
 
 DROP TABLE t1, t2, t3;
 #20

mysql-test/main/opt_trace.result

@@ -1114,8 +1114,8 @@ explain select * from t1,t2 where t1.a=t2.b+2 and t2.a= t1.b	{
                             },
                             {
                               "access_type": "scan",
-                              "resulting_rows": 100,
+                              "resulting_rows": 75,
-                              "cost": 2.317382812,
+                              "cost": 7.317382812,
                               "chosen": false
                             }
                           ],
@@ -1162,8 +1162,8 @@ explain select * from t1,t2 where t1.a=t2.b+2 and t2.a= t1.b	{
                             },
                             {
                               "access_type": "scan",
-                              "resulting_rows": 100,
+                              "resulting_rows": 75,
-                              "cost": 2.317382812,
+                              "cost": 7.317382812,
                               "chosen": false
                             }
                           ],
@@ -2688,8 +2688,8 @@ explain select * from t1 left join t2 on t2.a=t1.a	{
                             },
                             {
                               "access_type": "scan",
-                              "resulting_rows": 2,
+                              "resulting_rows": 1.5,
-                              "cost": 8.017578125,
+                              "cost": 8.417578125,
                               "chosen": false
                             }
                           ],
@@ -9493,8 +9493,8 @@ JSON_DETAILED(JSON_EXTRACT(trace, '$**.considered_execution_plans'))
                                     },
                                     {
                                         "access_type": "scan",
-                                        "resulting_rows": 800,
+                                        "resulting_rows": 600,
-                                        "cost": 44.19726562,
+                                        "cost": 84.19726562,
                                         "chosen": false
                                     }
                                 ],
@@ -9722,8 +9722,8 @@ JSON_DETAILED(JSON_EXTRACT(trace, '$**.considered_execution_plans'))
                                     },
                                     {
                                         "access_type": "scan",
-                                        "resulting_rows": 100,
+                                        "resulting_rows": 75,
-                                        "cost": 2.219726562,
+                                        "cost": 7.219726562,
                                         "chosen": false
                                     }
                                 ],
@@ -9779,16 +9779,16 @@ JSON_DETAILED(JSON_EXTRACT(trace, '$**.considered_execution_plans'))
                                     },
                                     {
                                         "access_type": "scan",
-                                        "resulting_rows": 10,
+                                        "resulting_rows": 7.5,
-                                        "cost": 2.021972656,
+                                        "cost": 2.521972656,
                                         "chosen": true
                                     }
                                 ],
                                 "chosen_access_method": 
                                 {
                                     "type": "scan",
-                                    "records": 10,
+                                    "records": 7.5,
-                                    "cost": 2.021972656,
+                                    "cost": 2.521972656,
                                     "uses_join_buffering": true
                                 }
                             }
@@ -9799,10 +9799,10 @@ JSON_DETAILED(JSON_EXTRACT(trace, '$**.considered_execution_plans'))
                     "plan_prefix": 
                     ["t2"],
                     "table": "t1",
-                    "rows_for_plan": 1000,
+                    "rows_for_plan": 750,
-                    "cost_for_plan": 224.2416992,
+                    "cost_for_plan": 174.7416992,
                     "pruned_by_cost": true,
-                    "current_cost": 224.2416992,
+                    "current_cost": 174.7416992,
                     "best_cost": 36.0278306
                 }
             ]
@@ -10193,9 +10193,9 @@ create table t3 (a int, b int, c int);
 insert into t3 values (0,0,0),(1,1,1),(2,2,2),(3,3,3),(4,4,4);
 explain select * from t2,t1,t3 where t2.b= t1.b and t1.a=t3.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
-1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	5	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t1	index	PRIMARY	PRIMARY	12	NULL	5	Using where; Using index; Using join buffer (flat, BNL join)
-1	SIMPLE	t1	ref	PRIMARY	PRIMARY	8	test.t3.a,test.t2.b	1	Using index
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	5	Using where; Using join buffer (incremental, BNL join)
 set @trace=(select trace from information_schema.optimizer_trace);
 set @path= (select json_search(@trace, 'one', 'no predicate for first keypart'));
 set @sub_path= substr(@path, 2, locate('.best_access_path', @path)-2);

mysql-test/main/rowid_filter.result

@@ -2257,8 +2257,8 @@ pk1	a1	b1	pk2	a2	b2
 EXPLAIN EXTENDED SELECT * FROM t1 INNER JOIN t2 ON ( pk1+1 = pk2+2 AND a1 = a2 )
 WHERE b1 <= ( SELECT MAX(b2) FROM t2 WHERE pk2 <= 1 );
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	101	100.00	Using where
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	101	100.00	
-1	PRIMARY	t1	ref	a1,b1	a1	5	test.t2.a2	36	28.75	Using where
+1	PRIMARY	t1	ALL	a1,b1	NULL	NULL	NULL	400	21.56	Using where; Using join buffer (flat, BNL join)
 2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	100.00	Using index condition
 Warnings:
 Note	1003	/* select#1 */ select `test`.`t1`.`pk1` AS `pk1`,`test`.`t1`.`a1` AS `a1`,`test`.`t1`.`b1` AS `b1`,`test`.`t2`.`pk2` AS `pk2`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`b2` AS `b2` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a1` = `test`.`t2`.`a2` and `test`.`t1`.`b1` <= (/* select#2 */ select max(`test`.`t2`.`b2`) from `test`.`t2` where `test`.`t2`.`pk2` <= 1) and `test`.`t1`.`pk1` + 1 = `test`.`t2`.`pk2` + 2
@@ -2274,22 +2274,23 @@ EXPLAIN
           "table_name": "t2",
           "access_type": "ALL",
           "rows": 101,
-          "filtered": 100,
+          "filtered": 100
-          "attached_condition": "t2.a2 is not null"
         }
       },
       {
+        "block-nl-join": {
           "table": {
             "table_name": "t1",
-          "access_type": "ref",
+            "access_type": "ALL",
             "possible_keys": ["a1", "b1"],
-          "key": "a1",
+            "rows": 400,
-          "key_length": "5",
+            "filtered": 21.5625,
-          "used_key_parts": ["a1"],
+            "attached_condition": "t1.b1 <= (subquery#2)"
-          "ref": ["test.t2.a2"],
+          },
-          "rows": 36,
+          "buffer_type": "flat",
-          "filtered": 28.75,
+          "buffer_size": "1Kb",
-          "attached_condition": "t1.b1 <= (subquery#2) and t1.pk1 + 1 = t2.pk2 + 2"
+          "join_type": "BNL",
+          "attached_condition": "t1.a1 = t2.a2 and t1.pk1 + 1 = t2.pk2 + 2"
         }
       }
     ],

mysql-test/main/rowid_filter_innodb.result

@@ -2247,8 +2247,8 @@ pk1	a1	b1	pk2	a2	b2
 EXPLAIN EXTENDED SELECT * FROM t1 INNER JOIN t2 ON ( pk1+1 = pk2+2 AND a1 = a2 )
 WHERE b1 <= ( SELECT MAX(b2) FROM t2 WHERE pk2 <= 1 );
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	101	100.00	Using where
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	101	100.00	
-1	PRIMARY	t1	ref	a1,b1	a1	5	test.t2.a2	36	28.75	Using where
+1	PRIMARY	t1	ALL	a1,b1	NULL	NULL	NULL	400	21.56	Using where; Using join buffer (flat, BNL join)
 2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	100.00	Using index condition
 Warnings:
 Note	1003	/* select#1 */ select `test`.`t1`.`pk1` AS `pk1`,`test`.`t1`.`a1` AS `a1`,`test`.`t1`.`b1` AS `b1`,`test`.`t2`.`pk2` AS `pk2`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`b2` AS `b2` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a1` = `test`.`t2`.`a2` and `test`.`t1`.`b1` <= (/* select#2 */ select max(`test`.`t2`.`b2`) from `test`.`t2` where `test`.`t2`.`pk2` <= 1) and `test`.`t1`.`pk1` + 1 = `test`.`t2`.`pk2` + 2
@@ -2264,22 +2264,23 @@ EXPLAIN
           "table_name": "t2",
           "access_type": "ALL",
           "rows": 101,
-          "filtered": 100,
+          "filtered": 100
-          "attached_condition": "t2.a2 is not null"
         }
       },
       {
+        "block-nl-join": {
           "table": {
             "table_name": "t1",
-          "access_type": "ref",
+            "access_type": "ALL",
             "possible_keys": ["a1", "b1"],
-          "key": "a1",
+            "rows": 400,
-          "key_length": "5",
+            "filtered": 21.5625,
-          "used_key_parts": ["a1"],
+            "attached_condition": "t1.b1 <= (subquery#2)"
-          "ref": ["test.t2.a2"],
+          },
-          "rows": 36,
+          "buffer_type": "flat",
-          "filtered": 28.75,
+          "buffer_size": "1Kb",
-          "attached_condition": "t1.b1 <= (subquery#2) and t1.pk1 + 1 = t2.pk2 + 2"
+          "join_type": "BNL",
+          "attached_condition": "t1.a1 = t2.a2 and t1.pk1 + 1 = t2.pk2 + 2"
         }
       }
     ],

mysql-test/main/select.result

@@ -3480,7 +3480,7 @@ EXPLAIN
 SELECT a, c, d, f FROM t1,t2 WHERE a=c AND b BETWEEN 4 AND 6 AND a > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using where
-1	SIMPLE	t2	ref	c	c	5	test.t1.a	2	
+1	SIMPLE	t2	ALL	c	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
 DROP TABLE t1, t2;
 create table t1 (
 a int unsigned    not null auto_increment primary key,

mysql-test/main/select_jcl6.result

@@ -3491,7 +3491,7 @@ EXPLAIN
 SELECT a, c, d, f FROM t1,t2 WHERE a=c AND b BETWEEN 4 AND 6 AND a > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using where; Rowid-ordered scan
-1	SIMPLE	t2	ref	c	c	5	test.t1.a	2	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+1	SIMPLE	t2	ALL	c	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
 DROP TABLE t1, t2;
 create table t1 (
 a int unsigned    not null auto_increment primary key,

mysql-test/main/select_pkeycache.result

@@ -3480,7 +3480,7 @@ EXPLAIN
 SELECT a, c, d, f FROM t1,t2 WHERE a=c AND b BETWEEN 4 AND 6 AND a > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using where
-1	SIMPLE	t2	ref	c	c	5	test.t1.a	2	
+1	SIMPLE	t2	ALL	c	NULL	NULL	NULL	18	Using where; Using join buffer (flat, BNL join)
 DROP TABLE t1, t2;
 create table t1 (
 a int unsigned    not null auto_increment primary key,

mysql-test/main/selectivity.result

@@ -114,17 +114,17 @@ order by
 s_acctbal desc, n_name, s_name, p_partkey;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	region	ALL	PRIMARY	NULL	NULL	NULL	5	20.00	Using where; Using temporary; Using filesort
-1	PRIMARY	nation	ref	PRIMARY,i_n_regionkey	i_n_regionkey	5	dbt3_s001.region.r_regionkey	5	100.00	
-1	PRIMARY	supplier	ref	PRIMARY,i_s_nationkey	i_s_nationkey	5	dbt3_s001.nation.n_nationkey	1	100.00	
 1	PRIMARY	part	ALL	PRIMARY	NULL	NULL	NULL	200	2.08	Using where; Using join buffer (flat, BNL join)
-1	PRIMARY	partsupp	eq_ref	PRIMARY,i_ps_partkey,i_ps_suppkey	PRIMARY	8	dbt3_s001.part.p_partkey,dbt3_s001.supplier.s_suppkey	1	100.00	Using where
+1	PRIMARY	partsupp	ref	PRIMARY,i_ps_partkey,i_ps_suppkey	i_ps_partkey	4	dbt3_s001.part.p_partkey	3	100.00	Using where
+1	PRIMARY	supplier	eq_ref	PRIMARY,i_s_nationkey	PRIMARY	4	dbt3_s001.partsupp.ps_suppkey	1	100.00	Using where
+1	PRIMARY	nation	eq_ref	PRIMARY,i_n_regionkey	PRIMARY	4	dbt3_s001.supplier.s_nationkey	1	100.00	Using where
 2	DEPENDENT SUBQUERY	region	ALL	PRIMARY	NULL	NULL	NULL	5	20.00	Using where
 2	DEPENDENT SUBQUERY	partsupp	ref	PRIMARY,i_ps_partkey,i_ps_suppkey	i_ps_partkey	4	dbt3_s001.part.p_partkey	3	100.00	
 2	DEPENDENT SUBQUERY	supplier	eq_ref	PRIMARY,i_s_nationkey	PRIMARY	4	dbt3_s001.partsupp.ps_suppkey	1	100.00	Using where
 2	DEPENDENT SUBQUERY	nation	eq_ref	PRIMARY,i_n_regionkey	PRIMARY	4	dbt3_s001.supplier.s_nationkey	1	100.00	Using where
 Warnings:
 Note	1276	Field or reference 'dbt3_s001.part.p_partkey' of SELECT #2 was resolved in SELECT #1
-Note	1003	/* select#1 */ select `dbt3_s001`.`supplier`.`s_acctbal` AS `s_acctbal`,`dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`nation`.`n_name` AS `n_name`,`dbt3_s001`.`part`.`p_partkey` AS `p_partkey`,`dbt3_s001`.`part`.`p_mfgr` AS `p_mfgr`,`dbt3_s001`.`supplier`.`s_address` AS `s_address`,`dbt3_s001`.`supplier`.`s_phone` AS `s_phone`,`dbt3_s001`.`supplier`.`s_comment` AS `s_comment` from `dbt3_s001`.`part` join `dbt3_s001`.`supplier` join `dbt3_s001`.`partsupp` join `dbt3_s001`.`nation` join `dbt3_s001`.`region` where `dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey` and `dbt3_s001`.`partsupp`.`ps_suppkey` = `dbt3_s001`.`supplier`.`s_suppkey` and `dbt3_s001`.`part`.`p_size` = 9 and `dbt3_s001`.`supplier`.`s_nationkey` = `dbt3_s001`.`nation`.`n_nationkey` and `dbt3_s001`.`nation`.`n_regionkey` = `dbt3_s001`.`region`.`r_regionkey` and `dbt3_s001`.`region`.`r_name` = 'ASIA' and `dbt3_s001`.`part`.`p_type` like '%TIN' and `dbt3_s001`.`partsupp`.`ps_supplycost` = <expr_cache><`dbt3_s001`.`part`.`p_partkey`>((/* select#2 */ select min(`dbt3_s001`.`partsupp`.`ps_supplycost`) from `dbt3_s001`.`partsupp` join `dbt3_s001`.`supplier` join `dbt3_s001`.`nation` join `dbt3_s001`.`region` where `dbt3_s001`.`supplier`.`s_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey` and `dbt3_s001`.`nation`.`n_nationkey` = `dbt3_s001`.`supplier`.`s_nationkey` and `dbt3_s001`.`nation`.`n_regionkey` = `dbt3_s001`.`region`.`r_regionkey` and `dbt3_s001`.`region`.`r_name` = 'ASIA' and `dbt3_s001`.`part`.`p_partkey` = `dbt3_s001`.`partsupp`.`ps_partkey`)) order by `dbt3_s001`.`supplier`.`s_acctbal` desc,`dbt3_s001`.`nation`.`n_name`,`dbt3_s001`.`supplier`.`s_name`,`dbt3_s001`.`part`.`p_partkey`
+Note	1003	/* select#1 */ select `dbt3_s001`.`supplier`.`s_acctbal` AS `s_acctbal`,`dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`nation`.`n_name` AS `n_name`,`dbt3_s001`.`part`.`p_partkey` AS `p_partkey`,`dbt3_s001`.`part`.`p_mfgr` AS `p_mfgr`,`dbt3_s001`.`supplier`.`s_address` AS `s_address`,`dbt3_s001`.`supplier`.`s_phone` AS `s_phone`,`dbt3_s001`.`supplier`.`s_comment` AS `s_comment` from `dbt3_s001`.`part` join `dbt3_s001`.`supplier` join `dbt3_s001`.`partsupp` join `dbt3_s001`.`nation` join `dbt3_s001`.`region` where `dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey` and `dbt3_s001`.`supplier`.`s_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey` and `dbt3_s001`.`part`.`p_size` = 9 and `dbt3_s001`.`nation`.`n_nationkey` = `dbt3_s001`.`supplier`.`s_nationkey` and `dbt3_s001`.`nation`.`n_regionkey` = `dbt3_s001`.`region`.`r_regionkey` and `dbt3_s001`.`region`.`r_name` = 'ASIA' and `dbt3_s001`.`part`.`p_type` like '%TIN' and `dbt3_s001`.`partsupp`.`ps_supplycost` = <expr_cache><`dbt3_s001`.`part`.`p_partkey`>((/* select#2 */ select min(`dbt3_s001`.`partsupp`.`ps_supplycost`) from `dbt3_s001`.`partsupp` join `dbt3_s001`.`supplier` join `dbt3_s001`.`nation` join `dbt3_s001`.`region` where `dbt3_s001`.`supplier`.`s_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey` and `dbt3_s001`.`nation`.`n_nationkey` = `dbt3_s001`.`supplier`.`s_nationkey` and `dbt3_s001`.`nation`.`n_regionkey` = `dbt3_s001`.`region`.`r_regionkey` and `dbt3_s001`.`region`.`r_name` = 'ASIA' and `dbt3_s001`.`part`.`p_partkey` = `dbt3_s001`.`partsupp`.`ps_partkey`)) order by `dbt3_s001`.`supplier`.`s_acctbal` desc,`dbt3_s001`.`nation`.`n_name`,`dbt3_s001`.`supplier`.`s_name`,`dbt3_s001`.`part`.`p_partkey`
 === Q15 ===
 create view revenue0 (supplier_no, total_revenue) as
 select l_suppkey, sum(l_extendedprice * (1 - l_discount))

mysql-test/main/stat_tables.result

@@ -71,10 +71,10 @@ order by revenue desc;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	region	ALL	PRIMARY	NULL	NULL	NULL	5	Using where; Using temporary; Using filesort
 1	SIMPLE	nation	ref	PRIMARY,i_n_regionkey	i_n_regionkey	5	dbt3_s001.region.r_regionkey	5	
-1	SIMPLE	supplier	ref	PRIMARY,i_s_nationkey	i_s_nationkey	5	dbt3_s001.nation.n_nationkey	1	
 1	SIMPLE	customer	ref	PRIMARY,i_c_nationkey	i_c_nationkey	5	dbt3_s001.nation.n_nationkey	6	
 1	SIMPLE	orders	ref|filter	PRIMARY,i_o_orderdate,i_o_custkey	i_o_custkey|i_o_orderdate	5|4	dbt3_s001.customer.c_custkey	15 (12%)	Using where; Using rowid filter
 1	SIMPLE	lineitem	ref	PRIMARY,i_l_suppkey,i_l_orderkey,i_l_orderkey_quantity	i_l_orderkey	4	dbt3_s001.orders.o_orderkey	4	Using where
+1	SIMPLE	supplier	eq_ref	PRIMARY,i_s_nationkey	PRIMARY	4	dbt3_s001.lineitem.l_suppkey	1	Using where
 select n_name, sum(l_extendedprice * (1 - l_discount)) as revenue
 from customer, orders, lineitem, supplier, nation, region
 where c_custkey = o_custkey and l_orderkey = o_orderkey
@@ -85,7 +85,7 @@ and r_name = 'AMERICA' and o_orderdate >= date '1995-01-01'
 group by n_name
 order by revenue desc;
 n_name	revenue
-PERU	321915.87150000007
+PERU	321915.8715
 ARGENTINA	69817.1451
 set optimizer_switch=@save_optimizer_switch;
 delete from mysql.index_stats;
@@ -178,10 +178,10 @@ order by revenue desc;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	region	ALL	PRIMARY	NULL	NULL	NULL	5	Using where; Using temporary; Using filesort
 1	SIMPLE	nation	ref	PRIMARY,i_n_regionkey	i_n_regionkey	5	dbt3_s001.region.r_regionkey	5	
-1	SIMPLE	supplier	ref	PRIMARY,i_s_nationkey	i_s_nationkey	5	dbt3_s001.nation.n_nationkey	1	
 1	SIMPLE	customer	ref	PRIMARY,i_c_nationkey	i_c_nationkey	5	dbt3_s001.nation.n_nationkey	6	
 1	SIMPLE	orders	ref|filter	PRIMARY,i_o_orderdate,i_o_custkey	i_o_custkey|i_o_orderdate	5|4	dbt3_s001.customer.c_custkey	15 (12%)	Using where; Using rowid filter
 1	SIMPLE	lineitem	ref	PRIMARY,i_l_suppkey,i_l_orderkey,i_l_orderkey_quantity	i_l_orderkey	4	dbt3_s001.orders.o_orderkey	4	Using where
+1	SIMPLE	supplier	eq_ref	PRIMARY,i_s_nationkey	PRIMARY	4	dbt3_s001.lineitem.l_suppkey	1	Using where
 select n_name, sum(l_extendedprice * (1 - l_discount)) as revenue
 from customer, orders, lineitem, supplier, nation, region
 where c_custkey = o_custkey and l_orderkey = o_orderkey
@@ -192,7 +192,7 @@ and r_name = 'AMERICA' and o_orderdate >= date '1995-01-01'
 group by n_name
 order by revenue desc;
 n_name	revenue
-PERU	321915.87150000007
+PERU	321915.8715
 ARGENTINA	69817.1451
 set optimizer_switch=@save_optimizer_switch;
 EXPLAIN select o_year,

mysql-test/main/subselect.result

@@ -345,7 +345,7 @@ patient_uq	clinic_uq
 explain extended select * from t6 where exists (select * from t7 where uq = clinic_uq);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t7	index	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index
-1	PRIMARY	t6	ALL	i1	NULL	NULL	NULL	4	100.00	Using where; Using join buffer (flat, BNL join)
+1	PRIMARY	t6	ALL	i1	NULL	NULL	NULL	4	75.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1276	Field or reference 'test.t6.clinic_uq' of SELECT #2 was resolved in SELECT #1
 Note	1003	select `test`.`t6`.`patient_uq` AS `patient_uq`,`test`.`t6`.`clinic_uq` AS `clinic_uq` from `test`.`t7` join `test`.`t6` where `test`.`t6`.`clinic_uq` = `test`.`t7`.`uq`
@@ -1440,7 +1440,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	100.00	Using index
+1	PRIMARY	t1	index	PRIMARY	PRIMARY	4	NULL	4	75.00	Using where; Using index; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a` = `test`.`t2`.`a`
 select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
@@ -1450,7 +1450,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	100.00	Using where
+1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	75.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a` = `test`.`t2`.`a` and `test`.`t1`.`b` <> 30
 select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
@@ -1459,11 +1459,11 @@ a
 3
 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	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
+1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	100.00	
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	100.00	
+1	PRIMARY	t3	index	PRIMARY	PRIMARY	4	NULL	3	75.00	Using where; Using index; Using join buffer (flat, BNL join)
-1	PRIMARY	t3	index	PRIMARY	PRIMARY	4	NULL	3	100.00	Using where; Using index; Using join buffer (flat, BNL join)
+1	PRIMARY	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	100.00	Using index
 Warnings:
-Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t3` join `test`.`t2` where `test`.`t3`.`a` = `test`.`t1`.`b` and `test`.`t1`.`a` = `test`.`t2`.`a`
+Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t3` join `test`.`t2` where `test`.`t3`.`a` = `test`.`t1`.`b` and `test`.`t2`.`a` = `test`.`t1`.`a`
 drop table t1, t2, t3;
 create table t1 (a int, b int, index a (a,b));
 create table t2 (a int, index a (a));

mysql-test/main/subselect3.result

@@ -166,7 +166,7 @@ from t3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	
 2	DEPENDENT SUBQUERY	t1	ref_or_null	a	a	5	func	4	100.00	Using where; Full scan on NULL key
-2	DEPENDENT SUBQUERY	t2	ref	a	a	5	test.t1.b	1	100.00	Using where
+2	DEPENDENT SUBQUERY	t2	ALL	a	NULL	NULL	NULL	10	75.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1276	Field or reference 'test.t3.oref' of SELECT #2 was resolved in SELECT #1
 Note	1003	/* select#1 */ select `test`.`t3`.`a` AS `a`,`test`.`t3`.`oref` AS `oref`,<expr_cache><`test`.`t3`.`a`,`test`.`t3`.`oref`>(<in_optimizer>(`test`.`t3`.`a`,<exists>(/* select#2 */ select `test`.`t1`.`a` from `test`.`t1` join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`b` and `test`.`t2`.`b` = `test`.`t3`.`oref` and trigcond(<cache>(`test`.`t3`.`a`) = `test`.`t1`.`a` or `test`.`t1`.`a` is null) having trigcond(`test`.`t1`.`a` is null)))) AS `Z` from `test`.`t3`

mysql-test/main/subselect3_jcl6.result

@@ -169,7 +169,7 @@ from t3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	
 2	DEPENDENT SUBQUERY	t1	ref_or_null	a	a	5	func	4	100.00	Using where; Full scan on NULL key
-2	DEPENDENT SUBQUERY	t2	ref	a	a	5	test.t1.b	1	100.00	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+2	DEPENDENT SUBQUERY	t2	ALL	a	NULL	NULL	NULL	10	75.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1276	Field or reference 'test.t3.oref' of SELECT #2 was resolved in SELECT #1
 Note	1003	/* select#1 */ select `test`.`t3`.`a` AS `a`,`test`.`t3`.`oref` AS `oref`,<expr_cache><`test`.`t3`.`a`,`test`.`t3`.`oref`>(<in_optimizer>(`test`.`t3`.`a`,<exists>(/* select#2 */ select `test`.`t1`.`a` from `test`.`t1` join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`b` and `test`.`t2`.`b` = `test`.`t3`.`oref` and trigcond(<cache>(`test`.`t3`.`a`) = `test`.`t1`.`a` or `test`.`t1`.`a` is null) having trigcond(`test`.`t1`.`a` is null)))) AS `Z` from `test`.`t3`

mysql-test/main/subselect_exists2in.result

@@ -52,7 +52,7 @@ explain extended
 SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	index	aa	aa	4	NULL	2	100.00	Using index
-1	PRIMARY	t3	ALL	bb	NULL	NULL	NULL	2	100.00	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
+1	PRIMARY	t3	ALL	bb	NULL	NULL	NULL	2	75.00	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
 Warnings:
 Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
 Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3`) where `test`.`t3`.`b` = `test`.`t1`.`a`

mysql-test/main/subselect_mat.result

@@ -1889,8 +1889,8 @@ WHERE alias4.c = alias3.b
 );
 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
-3	MATERIALIZED	alias3	ALL	NULL	NULL	NULL	NULL	2	Using where
+3	MATERIALIZED	alias3	ALL	NULL	NULL	NULL	NULL	2	
-3	MATERIALIZED	alias4	ref	c	c	11	test.alias3.b	2	Using where; Using index
+3	MATERIALIZED	alias4	index	c	c	11	NULL	2	Using where; Using index; Using join buffer (flat, BNL join)
 DROP TABLE t1,t2;
 #
 # BUG#928048: Query containing IN subquery with OR in the where clause returns a wrong result

mysql-test/main/subselect_mat_cost_bugs.result

@@ -97,7 +97,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	9	100.00	Using where
 2	DEPENDENT SUBQUERY	t1b	ALL	NULL	NULL	NULL	NULL	9	100.00	
 2	DEPENDENT SUBQUERY	t1a	ref	c2	c2	5	test.t1b.pk	1	100.00	Using where
-2	DEPENDENT SUBQUERY	t2	index	c3	c3	9	NULL	2	100.00	Using where; Using index; Using join buffer (flat, BNL join)
+2	DEPENDENT SUBQUERY	t2	index	c3	c3	9	NULL	2	75.00	Using where; Using index; Using join buffer (flat, BNL join)
 Warnings:
 Note	1276	Field or reference 'test.t1.pk' of SELECT #2 was resolved in SELECT #1
 Note	1003	/* select#1 */ select `test`.`t1`.`pk` AS `pk` from `test`.`t1` where <expr_cache><`test`.`t1`.`c1`,`test`.`t1`.`pk`>(<in_optimizer>(`test`.`t1`.`c1`,<exists>(/* select#2 */ select `test`.`t1a`.`c1` from `test`.`t1b` join `test`.`t2` left join `test`.`t1a` on(`test`.`t1a`.`c2` = `test`.`t1b`.`pk` and 2) where `test`.`t2`.`c3` = `test`.`t1b`.`c4` and `test`.`t1`.`pk` <> 0 and <cache>(`test`.`t1`.`c1`) = `test`.`t1a`.`c1`)))

mysql-test/main/subselect_no_exists_to_in.result

@@ -1444,7 +1444,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	100.00	Using index
+1	PRIMARY	t1	index	PRIMARY	PRIMARY	4	NULL	4	75.00	Using where; Using index; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a` = `test`.`t2`.`a`
 select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
@@ -1454,7 +1454,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	100.00	Using where
+1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	75.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a` = `test`.`t2`.`a` and `test`.`t1`.`b` <> 30
 select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
@@ -1463,11 +1463,11 @@ a
 3
 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	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
+1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	100.00	
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	100.00	
+1	PRIMARY	t3	index	PRIMARY	PRIMARY	4	NULL	3	75.00	Using where; Using index; Using join buffer (flat, BNL join)
-1	PRIMARY	t3	index	PRIMARY	PRIMARY	4	NULL	3	100.00	Using where; Using index; Using join buffer (flat, BNL join)
+1	PRIMARY	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	100.00	Using index
 Warnings:
-Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t3` join `test`.`t2` where `test`.`t3`.`a` = `test`.`t1`.`b` and `test`.`t1`.`a` = `test`.`t2`.`a`
+Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t3` join `test`.`t2` where `test`.`t3`.`a` = `test`.`t1`.`b` and `test`.`t2`.`a` = `test`.`t1`.`a`
 drop table t1, t2, t3;
 create table t1 (a int, b int, index a (a,b));
 create table t2 (a int, index a (a));

mysql-test/main/subselect_no_mat.result

@@ -352,7 +352,7 @@ patient_uq	clinic_uq
 explain extended select * from t6 where exists (select * from t7 where uq = clinic_uq);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t7	index	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index
-1	PRIMARY	t6	ALL	i1	NULL	NULL	NULL	4	100.00	Using where; Using join buffer (flat, BNL join)
+1	PRIMARY	t6	ALL	i1	NULL	NULL	NULL	4	75.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1276	Field or reference 'test.t6.clinic_uq' of SELECT #2 was resolved in SELECT #1
 Note	1003	select `test`.`t6`.`patient_uq` AS `patient_uq`,`test`.`t6`.`clinic_uq` AS `clinic_uq` from `test`.`t7` join `test`.`t6` where `test`.`t6`.`clinic_uq` = `test`.`t7`.`uq`
@@ -1447,7 +1447,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	100.00	Using index
+1	PRIMARY	t1	index	PRIMARY	PRIMARY	4	NULL	4	75.00	Using where; Using index; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a` = `test`.`t2`.`a`
 select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
@@ -1457,7 +1457,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	100.00	Using where
+1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	75.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a` = `test`.`t2`.`a` and `test`.`t1`.`b` <> 30
 select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
@@ -1466,11 +1466,11 @@ a
 3
 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	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
+1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	100.00	
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	100.00	
+1	PRIMARY	t3	index	PRIMARY	PRIMARY	4	NULL	3	75.00	Using where; Using index; Using join buffer (flat, BNL join)
-1	PRIMARY	t3	index	PRIMARY	PRIMARY	4	NULL	3	100.00	Using where; Using index; Using join buffer (flat, BNL join)
+1	PRIMARY	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	100.00	Using index
 Warnings:
-Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t3` join `test`.`t2` where `test`.`t3`.`a` = `test`.`t1`.`b` and `test`.`t1`.`a` = `test`.`t2`.`a`
+Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t3` join `test`.`t2` where `test`.`t3`.`a` = `test`.`t1`.`b` and `test`.`t2`.`a` = `test`.`t1`.`a`
 drop table t1, t2, t3;
 create table t1 (a int, b int, index a (a,b));
 create table t2 (a int, index a (a));

mysql-test/main/subselect_no_opts.result

@@ -1506,10 +1506,10 @@ 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	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 index
-2	DEPENDENT SUBQUERY	t1	ref	a	a	10	func,test.t3.a	1167	100.00	Using index
+2	DEPENDENT SUBQUERY	t3	index	a	a	5	NULL	3	75.00	Using where; Using index; Using join buffer (flat, BNL join)
 Warnings:
-Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,<exists>(/* select#2 */ select `test`.`t1`.`a` from `test`.`t1` join `test`.`t3` where `test`.`t1`.`b` = `test`.`t3`.`a` and <cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`))
+Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,<exists>(/* select#2 */ select `test`.`t1`.`a` 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);
 select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
 a

mysql-test/main/subselect_no_scache.result

@@ -351,7 +351,7 @@ patient_uq	clinic_uq
 explain extended select * from t6 where exists (select * from t7 where uq = clinic_uq);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t7	index	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index
-1	PRIMARY	t6	ALL	i1	NULL	NULL	NULL	4	100.00	Using where; Using join buffer (flat, BNL join)
+1	PRIMARY	t6	ALL	i1	NULL	NULL	NULL	4	75.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1276	Field or reference 'test.t6.clinic_uq' of SELECT #2 was resolved in SELECT #1
 Note	1003	select `test`.`t6`.`patient_uq` AS `patient_uq`,`test`.`t6`.`clinic_uq` AS `clinic_uq` from `test`.`t7` join `test`.`t6` where `test`.`t6`.`clinic_uq` = `test`.`t7`.`uq`
@@ -1446,7 +1446,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	100.00	Using index
+1	PRIMARY	t1	index	PRIMARY	PRIMARY	4	NULL	4	75.00	Using where; Using index; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a` = `test`.`t2`.`a`
 select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
@@ -1456,7 +1456,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	100.00	Using where
+1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	75.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a` = `test`.`t2`.`a` and `test`.`t1`.`b` <> 30
 select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
@@ -1465,11 +1465,11 @@ a
 3
 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	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
+1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	100.00	
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	100.00	
+1	PRIMARY	t3	index	PRIMARY	PRIMARY	4	NULL	3	75.00	Using where; Using index; Using join buffer (flat, BNL join)
-1	PRIMARY	t3	index	PRIMARY	PRIMARY	4	NULL	3	100.00	Using where; Using index; Using join buffer (flat, BNL join)
+1	PRIMARY	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	100.00	Using index
 Warnings:
-Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t3` join `test`.`t2` where `test`.`t3`.`a` = `test`.`t1`.`b` and `test`.`t1`.`a` = `test`.`t2`.`a`
+Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t3` join `test`.`t2` where `test`.`t3`.`a` = `test`.`t1`.`b` and `test`.`t2`.`a` = `test`.`t1`.`a`
 drop table t1, t2, t3;
 create table t1 (a int, b int, index a (a,b));
 create table t2 (a int, index a (a));

mysql-test/main/subselect_no_semijoin.result

@@ -925,10 +925,10 @@ 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	MATERIALIZED	t2	index	a	a	5	NULL	3	100.00	Using index
+2	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	
-2	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
+2	MATERIALIZED	t2	index	a	a	5	NULL	3	75.00	Using where; Using index; Using join buffer (flat, BNL join)
 Warnings:
-Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,<expr_cache><`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (/* select#2 */ select `test`.`t2`.`a` from `test`.`t2` join `test`.`t3` where `test`.`t3`.`a` = `test`.`t2`.`a` ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where `test`.`t1`.`a` = `<subquery2>`.`a`)))) AS `t1.a in (select t2.a from t2,t3 where t3.a=t2.a)` from `test`.`t1`
+Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,<expr_cache><`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (/* select#2 */ select `test`.`t2`.`a` from `test`.`t2` join `test`.`t3` where `test`.`t2`.`a` = `test`.`t3`.`a` ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where `test`.`t1`.`a` = `<subquery2>`.`a`)))) AS `t1.a in (select t2.a from t2,t3 where t3.a=t2.a)` from `test`.`t1`
 drop table t1,t2,t3;
 # check correct NULL Processing for normal IN/ALL/ANY
 # and 2 ways of max/min optimization
@@ -1463,10 +1463,10 @@ 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	PRIMARY	4	NULL	4	100.00	Using where; Using index
-2	MATERIALIZED	t3	index	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index
+2	MATERIALIZED	t1	ALL	PRIMARY	NULL	NULL	NULL	4	100.00	
-2	MATERIALIZED	t1	ALL	PRIMARY	NULL	NULL	NULL	4	100.00	Using where; Using join buffer (flat, BNL join)
+2	MATERIALIZED	t3	index	PRIMARY	PRIMARY	4	NULL	3	75.00	Using where; Using index; Using join buffer (flat, BNL join)
 Warnings:
-Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a` from `test`.`t2` where <expr_cache><`test`.`t2`.`a`>(<in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (/* select#2 */ select `test`.`t1`.`a` from `test`.`t1` join `test`.`t3` where `test`.`t1`.`b` = `test`.`t3`.`a` ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where `test`.`t2`.`a` = `<subquery2>`.`a`))))
+Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a` from `test`.`t2` where <expr_cache><`test`.`t2`.`a`>(<in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (/* select#2 */ select `test`.`t1`.`a` from `test`.`t1` join `test`.`t3` where `test`.`t3`.`a` = `test`.`t1`.`b` ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where `test`.`t2`.`a` = `<subquery2>`.`a`))))
 drop table t1, t2, t3;
 create table t1 (a int, b int, index a (a,b));
 create table t2 (a int, index a (a));
@@ -1506,10 +1506,10 @@ 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	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 index
-2	DEPENDENT SUBQUERY	t1	ref	a	a	10	func,test.t3.a	1167	100.00	Using index
+2	DEPENDENT SUBQUERY	t3	index	a	a	5	NULL	3	75.00	Using where; Using index; Using join buffer (flat, BNL join)
 Warnings:
-Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a` from `test`.`t2` where <expr_cache><`test`.`t2`.`a`>(<in_optimizer>(`test`.`t2`.`a`,<exists>(/* select#2 */ select `test`.`t1`.`a` from `test`.`t1` join `test`.`t3` where `test`.`t1`.`b` = `test`.`t3`.`a` and <cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`)))
+Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a` from `test`.`t2` where <expr_cache><`test`.`t2`.`a`>(<in_optimizer>(`test`.`t2`.`a`,<exists>(/* select#2 */ select `test`.`t1`.`a` 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);
 select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
 a

mysql-test/main/subselect_sj.result

@@ -1249,8 +1249,8 @@ INSERT INTO t2 VALUES (1, 0), (1, 1), (2, 0), (2, 1);
 EXPLAIN
 SELECT * FROM t1 WHERE (i) IN (SELECT i FROM t2 where j > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t2	index	k	k	10	NULL	4	Using where; Using index; Start temporary
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	Using where; End temporary; Using join buffer (flat, BNL join)
+1	PRIMARY	t2	index	k	k	10	NULL	4	Using where; Using index; Start temporary; End temporary
 SELECT * FROM t1 WHERE (i) IN (SELECT i FROM t2 where j > 0);
 i
 1
@@ -1610,9 +1610,9 @@ A.t1field IN (SELECT C.t2field FROM t2 C
 WHERE C.t2field IN (SELECT D.t2field FROM t2 D));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	A	index	PRIMARY	PRIMARY	4	NULL	3	Using index
-1	PRIMARY	C	eq_ref	PRIMARY	PRIMARY	4	test.A.t1field	1	Using index
-1	PRIMARY	D	eq_ref	PRIMARY	PRIMARY	4	test.A.t1field	1	Using index
 1	PRIMARY	B	index	NULL	PRIMARY	4	NULL	3	Using index; Start temporary; End temporary
+1	PRIMARY	C	index	PRIMARY	PRIMARY	4	NULL	3	Using where; Using index; Using join buffer (flat, BNL join)
+1	PRIMARY	D	eq_ref	PRIMARY	PRIMARY	4	test.A.t1field	1	Using index
 SELECT * FROM t1 A 
 WHERE 
 A.t1field IN (SELECT A.t1field FROM t2 B) AND 
@@ -2154,8 +2154,8 @@ explain
 SELECT * FROM t1, t2 WHERE (t2.a , t1.b) IN (SELECT a, b FROM t3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	2	Using index; Using join buffer (flat, BNL join)
+1	PRIMARY	t3	ALL	b	NULL	NULL	NULL	5	Using where; Start temporary
-1	PRIMARY	t3	ALL	b	NULL	NULL	NULL	5	Using where; Start temporary; End temporary
+1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	2	Using where; Using index; End temporary; Using join buffer (flat, BNL join)
 SELECT * FROM t1, t2 WHERE (t2.a , t1.b) IN (SELECT a, b FROM t3);
 b	a
 5	6
@@ -2350,8 +2350,8 @@ SELECT * FROM t1 WHERE (a) IN (SELECT a FROM t2 JOIN t3 ON b = a);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	9	
 1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	
-2	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	13	Using where
+2	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	13	
-2	MATERIALIZED	t2	ref	b	b	4	test.t3.a	1	Using index
+2	MATERIALIZED	t2	index	b	b	8	NULL	7	Using where; Using index
 SELECT * FROM t1 WHERE (a) IN (SELECT a FROM t2 JOIN t3 ON b = a);
 a
 19

mysql-test/main/subselect_sj_jcl6.result

@@ -1260,8 +1260,8 @@ INSERT INTO t2 VALUES (1, 0), (1, 1), (2, 0), (2, 1);
 EXPLAIN
 SELECT * FROM t1 WHERE (i) IN (SELECT i FROM t2 where j > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t2	index	k	k	10	NULL	4	Using where; Using index; Start temporary
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	Using where; End temporary; Using join buffer (flat, BNL join)
+1	PRIMARY	t2	index	k	k	10	NULL	4	Using where; Using index; Start temporary; End temporary; Using join buffer (flat, BNL join)
 SELECT * FROM t1 WHERE (i) IN (SELECT i FROM t2 where j > 0);
 i
 1
@@ -1621,9 +1621,9 @@ A.t1field IN (SELECT C.t2field FROM t2 C
 WHERE C.t2field IN (SELECT D.t2field FROM t2 D));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	A	index	PRIMARY	PRIMARY	4	NULL	3	Using index
-1	PRIMARY	C	eq_ref	PRIMARY	PRIMARY	4	test.A.t1field	1	Using index
+1	PRIMARY	B	index	NULL	PRIMARY	4	NULL	3	Using index; FirstMatch(A); Using join buffer (flat, BNL join)
+1	PRIMARY	C	index	PRIMARY	PRIMARY	4	NULL	3	Using where; Using index; Using join buffer (incremental, BNL join)
 1	PRIMARY	D	eq_ref	PRIMARY	PRIMARY	4	test.A.t1field	1	Using index
-1	PRIMARY	B	index	NULL	PRIMARY	4	NULL	3	Using index; FirstMatch(D); Using join buffer (flat, BNL join)
 SELECT * FROM t1 A 
 WHERE 
 A.t1field IN (SELECT A.t1field FROM t2 B) AND 
@@ -2165,8 +2165,8 @@ explain
 SELECT * FROM t1, t2 WHERE (t2.a , t1.b) IN (SELECT a, b FROM t3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	2	Using index; Using join buffer (flat, BNL join)
+1	PRIMARY	t3	ALL	b	NULL	NULL	NULL	5	Using where; Start temporary; Using join buffer (flat, BNL join)
-1	PRIMARY	t3	ALL	b	NULL	NULL	NULL	5	Using where; Start temporary; End temporary; Using join buffer (incremental, BNL join)
+1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	2	Using where; Using index; End temporary; Using join buffer (incremental, BNL join)
 SELECT * FROM t1, t2 WHERE (t2.a , t1.b) IN (SELECT a, b FROM t3);
 b	a
 5	6
@@ -2361,8 +2361,8 @@ SELECT * FROM t1 WHERE (a) IN (SELECT a FROM t2 JOIN t3 ON b = a);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	9	
 1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	
-2	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	13	Using where
+2	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	13	
-2	MATERIALIZED	t2	ref	b	b	4	test.t3.a	1	Using index
+2	MATERIALIZED	t2	index	b	b	8	NULL	7	Using where; Using index; Using join buffer (flat, BNL join)
 SELECT * FROM t1 WHERE (a) IN (SELECT a FROM t2 JOIN t3 ON b = a);
 a
 19

mysql-test/main/subselect_sj_mat.result

@@ -380,7 +380,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	<subquery5>	eq_ref	distinct_key	distinct_key	16	func,func	1	100.00	
 2	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where
 5	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
-5	MATERIALIZED	t2i	ref	it2i1,it2i2,it2i3	it2i3	18	test.t3.c1,test.t3.c2	1	100.00	Using index
+5	MATERIALIZED	t2i	index	it2i1,it2i2,it2i3	it2i3	18	NULL	5	75.00	Using where; Using index; Using join buffer (flat, BNL join)
 4	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
 3	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
 Warnings:
@@ -405,7 +405,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where; Start temporary; End temporary; Using join buffer (flat, BNL join)
 1	PRIMARY	<subquery5>	eq_ref	distinct_key	distinct_key	16	func,func	1	100.00	
 5	MATERIALIZED	t3c	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
-5	MATERIALIZED	t2i	ref	it2i1,it2i2,it2i3	it2i3	18	test.t3c.c1,test.t3c.c2	1	100.00	Using index
+5	MATERIALIZED	t2i	index	it2i1,it2i2,it2i3	it2i3	18	NULL	5	75.00	Using where; Using index; Using join buffer (flat, BNL join)
 4	MATERIALIZED	t3b	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
 3	DEPENDENT SUBQUERY	t3a	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
 Warnings:
@@ -439,7 +439,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	<subquery5>	eq_ref	distinct_key	#	#	#	1	100.00	#
 2	MATERIALIZED	t2	ALL	NULL	#	#	#	5	100.00	#
 5	MATERIALIZED	t3	ALL	NULL	#	#	#	4	100.00	#
-5	MATERIALIZED	t2i	ref	it2i1,it2i2,it2i3	#	#	#	1	100.00	#
+5	MATERIALIZED	t2i	index	it2i1,it2i2,it2i3	#	#	#	5	75.00	#
 4	MATERIALIZED	t3	ALL	NULL	#	#	#	4	100.00	#
 3	MATERIALIZED	t3	ALL	NULL	#	#	#	4	100.00	#
 7	UNION	t1i	range	it1i1,it1i2,it1i3	#	#	#	3	100.00	#
@@ -475,7 +475,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 1	PRIMARY	<subquery4>	eq_ref	distinct_key	distinct_key	16	func,func	1	100.00	
 4	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
-4	MATERIALIZED	t2i	ref	it2i1,it2i2,it2i3	it2i3	18	test.t3.c1,test.t3.c2	1	100.00	Using index
+4	MATERIALIZED	t2i	index	it2i1,it2i2,it2i3	it2i3	18	NULL	5	75.00	Using where; Using index; Using join buffer (flat, BNL join)
 2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 3	DEPENDENT UNION	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where
 NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
@@ -499,7 +499,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where; Using join buffer (flat, BNL join)
 1	PRIMARY	<subquery4>	eq_ref	distinct_key	distinct_key	16	func,func	1	100.00	
 4	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
-4	MATERIALIZED	t2i	ref	it2i1,it2i2,it2i3	it2i3	18	test.t3.c1,test.t3.c2	1	100.00	Using index
+4	MATERIALIZED	t2i	index	it2i1,it2i2,it2i3	it2i3	18	NULL	5	75.00	Using where; Using index; Using join buffer (flat, BNL join)
 2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 3	DEPENDENT UNION	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where
 NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	

mysql-test/main/union.result

@@ -565,7 +565,7 @@ explain (select * from t1 where a=1 and b=10) union (select straight_join t1.a,t
 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
-2	UNION	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using index
+2	UNION	t2	index	PRIMARY	PRIMARY	4	NULL	4	Using where; Using index; Using join buffer (flat, BNL join)
 NULL	UNION RESULT	<union1,2>	ALL	NULL	NULL	NULL	NULL	NULL	
 set @@optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity,@@optimizer_switch=@save_optimizer_switch;
 explain (select * from t1 where a=1) union (select * from t1 where b=1);

mysql-test/suite/maria/mrr.result

@@ -404,8 +404,8 @@ FROM t1 AS table1, t2 AS table2
 WHERE
 table1.col_varchar_1024_latin1_key = table2.col_varchar_10_latin1 AND table1.pk<>0 ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	table2	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	table2	ALL	NULL	NULL	NULL	NULL	2	
-1	SIMPLE	table1	ref	PRIMARY,col_varchar_1024_latin1_key	col_varchar_1024_latin1_key	1027	test.table2.col_varchar_10_latin1	2	Using index condition(BKA); Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+1	SIMPLE	table1	ALL	PRIMARY,col_varchar_1024_latin1_key	NULL	NULL	NULL	10	Using where; Using join buffer (flat, BNL join)
 SELECT count(*)
 FROM t1 AS table1, t2 AS table2
 WHERE

sql/sql_select.cc

@@ -7699,7 +7699,7 @@ void set_position(JOIN *join,uint idx,JOIN_TAB *table,KEYUSE *key)
 
   @param s                      Current JOIN_TAB
   @param with_found_constraint  There is a filtering condition on the
-                                current table. See more below
+                                current table of type. See below.
   @param use_cond_selectivity   Value of optimizer_use_condition_selectivity.
                                 If > 1 then use table->cond_selecitivity.
 
@@ -7713,16 +7713,27 @@ void set_position(JOIN *join,uint idx,JOIN_TAB *table,KEYUSE *key)
    - apply the part of WHERE that refers only to this table.
    - The result cannot be bigger than table records
 
+   'with_found_constraint' is true if the WHERE has a top level expression of
+   type:
+   current_table.key_part=expression_that_contains_fields_from_previous_tables
+   Examples (assuming join order t1,t2):
+   WHERE t2.keypart1=t1.some_field
+   WHERE t2.keypart1=t1.some_field+t1.other_field
+
+   TODO:
+   Extend with_found_constraint' to be set for a top level expression of type
+   X=Y where X and Y has fields from current table and at least one field from
+   one o more previous tables.
+
   @see also
     table_after_join_selectivity() produces selectivity of condition that is
     checked after joining rows from this table to rows from preceding tables.
 */
 
-inline
+static double matching_candidates_in_table(JOIN_TAB *s,
-double matching_candidates_in_table(JOIN_TAB *s, bool with_found_constraint,
+                                           bool with_found_constraint,
                                            uint use_cond_selectivity)
 {
-  ha_rows records;
   double dbl_records;
 
   if (use_cond_selectivity > 1)
@@ -7740,10 +7751,19 @@ double matching_candidates_in_table(JOIN_TAB *s, bool with_found_constraint,
                 sel <= s->table->opt_range_condition_rows /
                 table_records);
     dbl_records= table_records * sel;
-    return dbl_records;
   }
-
+  else
-  records = s->found_records;
+  {
+    /*
+      This is only taking into considering constant key parts used with
+      this table!
+      If no such conditions existed the following should hold:
+      s->table->opt_range_condition_rows == s->found_rows ==
+      s->records.
+    */
+    DBUG_ASSERT(s->table->opt_range_condition_rows <= s->found_records);
+    dbl_records= rows2double(s->table->opt_range_condition_rows);
+  }
 
   /*
     If there is a filtering condition on the table (i.e. ref analyzer found
@@ -7754,17 +7774,9 @@ double matching_candidates_in_table(JOIN_TAB *s, bool with_found_constraint,
     This heuristic is supposed to force tables used in exprZ to be before
     this table in join order.
   */
+
   if (with_found_constraint)
-    records-= records/4;
+    dbl_records-= dbl_records/4;
-
-    /*
-      If applicable, get a more accurate estimate. Don't use the two
-      heuristics at once.
-    */
-  if (s->table->opt_range_condition_rows != s->found_records)
-    records= s->table->opt_range_condition_rows;
-
-  dbl_records= (double)records;
   return dbl_records;
 }
 
@@ -7988,6 +8000,9 @@ best_access_path(JOIN      *join,
           {
             found_part|= keyuse->keypart_map;
             key_parts_dependent= 0;
+            found_constraint|= (keyuse->used_tables &
+                                ~(remaining_tables |
+                                  join->const_table_map));
             if (!(keyuse->used_tables & ~join->const_table_map))
               const_part|= keyuse->keypart_map;
 
@@ -8022,6 +8037,7 @@ best_access_path(JOIN      *join,
         if (all_parts & 1)
           key_dependent|= key_parts_dependent;
 	found_ref|= best_part_found_ref;
+        /* Remember if the key expression used previous non const tables */
       } while (keyuse->table == table && keyuse->key == key);
 
       /*
@@ -8051,7 +8067,6 @@ best_access_path(JOIN      *join,
       }
       else
       {
-        found_constraint= MY_TEST(found_part);
         loose_scan_opt.check_ref_access_part1(s, key, start_key, found_part);
 
         /* Check if we found full key */

storage/spider/mysql-test/spider/r/direct_left_right_join_nullable.result

@@ -87,7 +87,7 @@ NULL	NULL	NULL	3
 connection child2_1;
 SELECT argument FROM mysql.general_log WHERE command_type != 'Execute' AND argument LIKE '%select %';
 argument
-select t0.`a` `a`,t2.`b` `b`,t2.`c` `c`,t3.`a` `a` from `auto_test_remote`.`ta_r_no_idx` t3 left join (`auto_test_remote`.`ta_r_auto_inc` t2 join `auto_test_remote`.`ta_r_3` t1 join `auto_test_remote`.`ta_r` t0) on ((t2.`b` = t3.`b`) and (t2.`c` = t1.`c`) and (t0.`a` = t1.`a`) and (t1.`a` is not null)) where 1 order by t3.`a` desc
+select t0.`a` `a`,t2.`b` `b`,t2.`c` `c`,t3.`a` `a` from `auto_test_remote`.`ta_r_no_idx` t3 left join (`auto_test_remote`.`ta_r_auto_inc` t2 join `auto_test_remote`.`ta_r_3` t1 join `auto_test_remote`.`ta_r` t0) on ((t2.`b` = t3.`b`) and (t1.`c` = t2.`c`) and (t0.`a` = t1.`a`) and (t1.`a` is not null)) where 1 order by t3.`a` desc
 SELECT argument FROM mysql.general_log WHERE command_type != 'Execute' AND argument LIKE '%select %'
 SELECT a, b, date_format(c, '%Y-%m-%d %H:%i:%s') FROM ta_r ORDER BY a;
 a	b	date_format(c, '%Y-%m-%d %H:%i:%s')

storage/spider/mysql-test/spider/r/direct_right_left_right_join_nullable.result

@@ -87,7 +87,7 @@ NULL	c	2000-01-03 00:00:00	3
 connection child2_1;
 SELECT argument FROM mysql.general_log WHERE command_type != 'Execute' AND argument LIKE '%select %';
 argument
-select t0.`a` `a`,t2.`b` `b`,t2.`c` `c`,t3.`a` `a` from `auto_test_remote`.`ta_r_no_idx` t3 left join (`auto_test_remote`.`ta_r_auto_inc` t2 join `auto_test_remote`.`ta_r_3` t1 left join `auto_test_remote`.`ta_r` t0 on ((t0.`a` = t1.`a`) and (t1.`a` is not null))) on ((t2.`b` = t3.`b`) and (t2.`c` = t1.`c`)) where 1 order by t3.`a` desc
+select t0.`a` `a`,t2.`b` `b`,t2.`c` `c`,t3.`a` `a` from `auto_test_remote`.`ta_r_no_idx` t3 left join (`auto_test_remote`.`ta_r_auto_inc` t2 join `auto_test_remote`.`ta_r_3` t1 left join `auto_test_remote`.`ta_r` t0 on ((t0.`a` = t1.`a`) and (t1.`a` is not null))) on ((t2.`b` = t3.`b`) and (t1.`c` = t2.`c`)) where 1 order by t3.`a` desc
 SELECT argument FROM mysql.general_log WHERE command_type != 'Execute' AND argument LIKE '%select %'
 SELECT a, b, date_format(c, '%Y-%m-%d %H:%i:%s') FROM ta_r ORDER BY a;
 a	b	date_format(c, '%Y-%m-%d %H:%i:%s')