Merge.

mysql-test/include/index_merge2.inc

@@ -123,6 +123,7 @@ analyze table t1;
 select count(*) from t1;
 
 --replace_column 9 REF
+--replace_result i2,i1 i1,i2
 explain select count(*) from t1 where
   key1a = 2 and key1b is null and  key2a = 2 and key2b is null;
 
@@ -130,6 +131,7 @@ select count(*) from t1 where
   key1a = 2 and key1b is null and key2a = 2 and key2b is null;
 
 --replace_column 9 REF
+--replace_result i3,i1 i1,i3
 explain select count(*) from t1 where
   key1a = 2 and key1b is null and key3a = 2 and key3b is null;
 

mysql-test/include/world_schema.inc

@@ -6,7 +6,7 @@ CREATE TABLE Country (
   Capital int(11) default NULL,
   PRIMARY KEY  (Code),
   UNIQUE INDEX (Name)
-);
+) COLLATE latin1_bin;
 CREATE TABLE City (
   ID int(11) NOT NULL auto_increment,
   Name char(35) NOT NULL default '',
@@ -15,11 +15,11 @@ CREATE TABLE City (
   PRIMARY KEY  (ID),
   INDEX (Population),
   INDEX (Country) 
-);
+) COLLATE latin1_bin;
 CREATE TABLE CountryLanguage (
   Country char(3) NOT NULL default '',
   Language char(30) NOT NULL default '',
   Percentage float(3,1) NOT NULL default '0.0',
   PRIMARY KEY  (Country, Language),
   INDEX (Percentage)
-);
+) COLLATE latin1_bin; 

mysql-test/include/world_schema1.inc

@@ -4,15 +4,15 @@ CREATE TABLE Country (
   SurfaceArea float(10,2) NOT NULL default '0.00',
   Population int(11) NOT NULL default '0',
   Capital int(11) default NULL
-);
+) COLLATE latin1_bin;
 CREATE TABLE City (
   ID int(11) NOT NULL,
   Name char(35) NOT NULL default '',
   Country char(3) NOT NULL default '',
   Population int(11) NOT NULL default '0'
-);
+) COLLATE latin1_bin;
 CREATE TABLE CountryLanguage (
   Country char(3) NOT NULL default '',
   Language char(30) NOT NULL default '',
   Percentage float(3,1) NOT NULL default '0.0'
-);
+) COLLATE latin1_bin;

mysql-test/r/archive_gis.result

@@ -403,7 +403,7 @@ Intersects(g1.g, g2.g) as i, Crosses(g1.g, g2.g) as r
 FROM gis_geometrycollection g1, gis_geometrycollection g2 ORDER BY first, second;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
-1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
+1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`g1`.`fid` AS `first`,`test`.`g2`.`fid` AS `second`,within(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `w`,contains(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `c`,overlaps(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `o`,equals(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `e`,disjoint(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `d`,touches(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `t`,intersects(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `i`,crosses(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `r` from `test`.`gis_geometrycollection` `g1` join `test`.`gis_geometrycollection` `g2` order by `test`.`g1`.`fid`,`test`.`g2`.`fid`
 DROP TABLE gis_point, gis_line, gis_polygon, gis_multi_point, gis_multi_line, gis_multi_polygon, gis_geometrycollection, gis_geometry;

mysql-test/r/compress.result

@@ -1435,7 +1435,7 @@ companynr	companynr
 explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer (flat, BNL join)
 select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
 fld1	companynr	fld3	period
 038008	37	reporters	1008

mysql-test/r/ctype_utf8.result

@@ -1537,7 +1537,7 @@ explain
 select substr(Z.a,-1), Z.a from t1 as Y join t1 as Z on Y.a=Z.a order by 1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	Y	ALL	NULL	NULL	NULL	NULL	2	Using temporary; Using filesort
-1	SIMPLE	Z	ALL	NULL	NULL	NULL	NULL	2	Using where; Using join buffer
+1	SIMPLE	Z	ALL	NULL	NULL	NULL	NULL	2	Using where; Using join buffer (flat, BNL join)
 select substr(Z.a,-1), Z.a from t1 as Y join t1 as Z on Y.a=Z.a order by 1;
 substr(Z.a,-1)	a
 3	123

mysql-test/r/derived.result

@@ -58,7 +58,7 @@ a	b	a	b
 explain select * from t1 as x1, (select * from t1) as x2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	x1	ALL	NULL	NULL	NULL	NULL	4	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	Using join buffer
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	Using join buffer (flat, BNL join)
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	
 drop table if exists  t2,t3;
 select * from (select 1) as a;
@@ -189,13 +189,13 @@ pla_id	test
 explain SELECT STRAIGHT_JOIN d.pla_id, m2.mat_id FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	m2	ALL	NULL	NULL	NULL	NULL	9	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
 2	DERIVED	mp	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 2	DERIVED	m1	eq_ref	PRIMARY	PRIMARY	3	test.mp.mat_id	1	
 explain SELECT STRAIGHT_JOIN d.pla_id, m2.test FROM t1 m2  INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	m2	ALL	NULL	NULL	NULL	NULL	9	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
 2	DERIVED	mp	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 2	DERIVED	m1	eq_ref	PRIMARY	PRIMARY	3	test.mp.mat_id	1	
 drop table t1,t2;
@@ -246,7 +246,7 @@ a	a
 explain select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	<derived4>	ALL	NULL	NULL	NULL	NULL	2	Using join buffer
+1	PRIMARY	<derived4>	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
 4	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	
 5	UNION	t1	ALL	NULL	NULL	NULL	NULL	2	
 NULL	UNION RESULT	<union4,5>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -313,7 +313,7 @@ explain SELECT s.name, AVG(s.val) AS median FROM (SELECT x.name, x.val FROM t1 x
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	3	Using temporary; Using filesort
 2	DERIVED	x	ALL	NULL	NULL	NULL	NULL	17	Using temporary; Using filesort
-2	DERIVED	y	ALL	NULL	NULL	NULL	NULL	17	Using where; Using join buffer
+2	DERIVED	y	ALL	NULL	NULL	NULL	NULL	17	Using where; Using join buffer (flat, BNL join)
 drop table t1;
 create table t2 (a int, b int, primary key (a));
 insert into t2 values (1,7),(2,7);

mysql-test/r/distinct.result

@@ -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	t1	ALL	PRIMARY	NULL	NULL	NULL	4	Using temporary
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	4	Using where; Using temporary
 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; Distinct; Using join buffer
+1	SIMPLE	t2	index	a	a	4	NULL	5	Using where; Using index; Distinct; 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
@@ -300,11 +300,11 @@ WHERE
 AND ((t1.id=j_lj_t3.id AND t3_lj.id IS NULL) OR (t1.id=t3.id AND t3.idx=2));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	index	id	id	4	NULL	2	Using index; Using temporary
-1	SIMPLE	t2	index	id	id	8	NULL	1	Using index; Distinct; Using join buffer
-1	SIMPLE	t3	index	id	id	8	NULL	1	Using index; Distinct; Using join buffer
-1	SIMPLE	j_lj_t2	index	id	id	4	NULL	2	Using where; Using index; Distinct; Using join buffer
+1	SIMPLE	t2	index	id	id	8	NULL	1	Using index; Distinct; Using join buffer (flat, BNL join)
+1	SIMPLE	t3	index	id	id	8	NULL	1	Using index; Distinct; Using join buffer (flat, BNL join)
+1	SIMPLE	j_lj_t2	index	id	id	4	NULL	2	Using where; Using index; Distinct; Using join buffer (flat, BNL join)
 1	SIMPLE	t2_lj	ref	id	id	4	test.j_lj_t2.id	1	Using where; Using index; Distinct
-1	SIMPLE	j_lj_t3	index	id	id	4	NULL	2	Using where; Using index; Distinct; Using join buffer
+1	SIMPLE	j_lj_t3	index	id	id	4	NULL	2	Using where; Using index; Distinct; Using join buffer (flat, BNL join)
 1	SIMPLE	t3_lj	ref	id	id	4	test.j_lj_t3.id	1	Using where; Using index; Distinct
 SELECT DISTINCT
 t1.id
@@ -515,7 +515,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1_1	ALL	NULL	NULL	NULL	NULL	3	Using temporary
-1	SIMPLE	t1_2	index	NULL	PRIMARY	4	NULL	3	Using index; Distinct; Using join buffer
+1	SIMPLE	t1_2	index	NULL	PRIMARY	4	NULL	3	Using index; Distinct; Using join buffer (flat, BNL join)
 EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2
 WHERE t1_1.a = t1_2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

mysql-test/r/explain.result

@@ -116,7 +116,7 @@ FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
-2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
+2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select 1 AS `1` from (select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
 EXPLAIN EXTENDED SELECT 1
@@ -124,7 +124,7 @@ FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
-2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
+2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select 1 AS `1` from (select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
 prepare s1 from 
@@ -134,7 +134,7 @@ execute s1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
-2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
+2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select 1 AS `1` from (select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
 prepare s1 from 
@@ -144,14 +144,14 @@ execute s1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
-2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
+2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select 1 AS `1` from (select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
 execute s1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
-2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
+2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select 1 AS `1` from (select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
 DROP TABLE t1,t2;
@@ -195,16 +195,16 @@ insert into t2 values ('2001-01-01 1:1:1'), ('2001-01-01 1:1:1');
 flush tables;
 EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL );
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	OUTR	ALL	NULL	NULL	NULL	NULL	2	Using where
-1	PRIMARY	INNR	ALL	NULL	NULL	NULL	NULL	2	Using where; FirstMatch(OUTR)
+1	PRIMARY	OUTR	ALL	NULL	NULL	NULL	NULL	2	Using where; Start temporary
+1	PRIMARY	INNR	ALL	NULL	NULL	NULL	NULL	2	Using where; End temporary; Using join buffer (flat, BNL join)
 flush tables;
 SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL );
 dt
 flush tables;
 EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' );
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	OUTR	ALL	NULL	NULL	NULL	NULL	2	Using where
-1	PRIMARY	INNR	ALL	NULL	NULL	NULL	NULL	2	Using where; FirstMatch(OUTR)
+1	PRIMARY	OUTR	ALL	NULL	NULL	NULL	NULL	2	Using where; Start temporary
+1	PRIMARY	INNR	ALL	NULL	NULL	NULL	NULL	2	Using where; End temporary; Using join buffer (flat, BNL join)
 flush tables;
 SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' );
 dt

mysql-test/r/func_gconcat.result

@@ -986,7 +986,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	100.00	
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort; Distinct
-2	DERIVED	td	ALL	NULL	NULL	NULL	NULL	2	100.00	Distinct; Using join buffer
+2	DERIVED	td	ALL	NULL	NULL	NULL	NULL	2	100.00	Distinct; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select 1 AS `1` from (select distinct group_concat(`test`.`td`.`f1` separator ',') AS `GROUP_CONCAT(td.f1)` from `test`.`t1` join `test`.`t1` `td` group by `test`.`td`.`f1`) `d` join `test`.`t1`
 SELECT 1 FROM
@@ -1007,7 +1007,7 @@ t1 t2, t1 GROUP BY t1.a) AS d;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	100.00	
 2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
-2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
+2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select 1 AS `1` from (select group_concat(`test`.`t1`.`a` order by `test`.`t1`.`a` ASC separator ',') AS `GROUP_CONCAT(t1.a ORDER BY t1.a ASC)` from `test`.`t1` `t2` join `test`.`t1` group by `test`.`t1`.`a`) `d`
 DROP TABLE t1;

mysql-test/r/func_group.result

@@ -614,7 +614,7 @@ explain
 select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 > 'CA';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	range	k1	k1	7	NULL	1	Using where; Using index
-1	SIMPLE	t2	range	k1	k1	3	NULL	4	Using where; Using index; Using join buffer
+1	SIMPLE	t2	range	k1	k1	3	NULL	4	Using where; Using index; Using join buffer (flat, BNL join)
 explain
 select min(a4 - 0.01) from t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -651,7 +651,7 @@ explain
 select concat(min(t1.a1),min(t2.a4)) from t1, t2 where t2.a4 <> 'AME';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	range	k2	k2	4	NULL	6	Using where; Using index
-1	SIMPLE	t1	index	NULL	PRIMARY	3	NULL	15	Using index; Using join buffer
+1	SIMPLE	t1	index	NULL	PRIMARY	3	NULL	15	Using index; Using join buffer (flat, BNL join)
 drop table t1, t2;
 create table t1 (a char(10));
 insert into t1 values ('a'),('b'),('c');

mysql-test/r/func_group_innodb.result

@@ -79,7 +79,7 @@ min(7)
 explain select min(7) from t2i join t1i;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	
-1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
+1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (flat, BNL join)
 select min(7) from t2i join t1i;
 min(7)
 NULL
@@ -95,7 +95,7 @@ max(7)
 explain select max(7) from t2i join t1i;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	
-1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
+1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (flat, BNL join)
 select max(7) from t2i join t1i;
 max(7)
 NULL

mysql-test/r/func_str.result

@@ -2550,12 +2550,12 @@ insert into t1 values (-1),(null);
 explain select 1 as a from t1,(select decode(f1,f1) as b from t1) a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	Using join buffer
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	
 explain select 1 as a from t1,(select encode(f1,f1) as b from t1) a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	Using join buffer
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	
 drop table t1;
 #

mysql-test/r/gis.result

@@ -395,7 +395,7 @@ Intersects(g1.g, g2.g) as i, Crosses(g1.g, g2.g) as r
 FROM gis_geometrycollection g1, gis_geometrycollection g2 ORDER BY first, second;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
-1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
+1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`g1`.`fid` AS `first`,`test`.`g2`.`fid` AS `second`,within(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `w`,contains(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `c`,overlaps(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `o`,equals(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `e`,disjoint(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `d`,touches(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `t`,intersects(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `i`,crosses(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `r` from `test`.`gis_geometrycollection` `g1` join `test`.`gis_geometrycollection` `g2` order by `test`.`g1`.`fid`,`test`.`g2`.`fid`
 DROP TABLE gis_point, gis_line, gis_polygon, gis_multi_point, gis_multi_line, gis_multi_polygon, gis_geometrycollection, gis_geometry;

mysql-test/r/group_by.result

@@ -537,11 +537,11 @@ a	b
 explain select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary; Using filesort
-1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
+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	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary
-1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
+1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer (flat, BNL join)
 drop table t1,t2;
 create table t1 (a int, b int);
 insert into t1 values (1, 4),(10, 40),(1, 4),(10, 43),(1, 4),(10, 41),(1, 4),(10, 43),(1, 4);
@@ -873,7 +873,7 @@ explain
 SELECT straight_join sql_no_cache v1.a, v1.b, v1.real_b from t2, v1
 where t2.b=v1.a GROUP BY t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	index	b	b	2	NULL	10	Using index
+1	SIMPLE	t2	index	b	b	2	NULL	10	Using where; Using index
 1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	1	test.t2.b	1	
 SELECT straight_join sql_no_cache v1.a, v1.b, v1.real_b from t2, v1
 where t2.b=v1.a GROUP BY t2.b;
@@ -1543,7 +1543,8 @@ EXPLAIN SELECT 1 FROM t1 WHERE a IN
 (SELECT a FROM t1 USE INDEX (i2) IGNORE INDEX (i2));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	index	PRIMARY,i2	PRIMARY	4	NULL	144	Using index
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	144	Using where; FirstMatch(t1)
+1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	4	func	1	
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	144	
 CREATE TABLE t2 (a INT, b INT, KEY(a));
 INSERT INTO t2 VALUES (1, 1), (2, 2), (3,3), (4,4);
 EXPLAIN SELECT a, SUM(b) FROM t2 GROUP BY a LIMIT 2;

mysql-test/r/group_min_max.result

@@ -2267,7 +2267,7 @@ ON t1_outer1.a = (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2)
 AND t1_outer1.b = t1_outer2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1_outer1	ref	a	a	5	const	1	Using where; Using index
-1	PRIMARY	t1_outer2	index	NULL	a	10	NULL	15	Using where; Using index; Using join buffer
+1	PRIMARY	t1_outer2	index	NULL	a	10	NULL	15	Using where; Using index; Using join buffer (flat, BNL join)
 2	SUBQUERY	t1	range	NULL	a	5	NULL	8	Using index for group-by
 EXPLAIN SELECT (SELECT (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) x
 FROM t1 AS t1_outer) x2 FROM t1 AS t1_outer2;

mysql-test/r/index_merge_myisam.result

@@ -271,7 +271,7 @@ explain select * from t0,t1 where t0.key1 = 5 and
 (t1.key1 = t0.key1 or t1.key8 = t0.key1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t0	ref	i1	i1	4	const	1	
-1	SIMPLE	t1	index_merge	i1,i8	i1,i8	4,4	NULL	2	Using union(i1,i8); Using where; Using join buffer
+1	SIMPLE	t1	index_merge	i1,i8	i1,i8	4,4	NULL	2	Using union(i1,i8); Using where; Using join buffer (flat, BNL join)
 explain select * from t0,t1 where t0.key1 < 3 and
 (t1.key1 = t0.key1 or t1.key8 = t0.key1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -348,7 +348,7 @@ where (A.key1 < 500000 or A.key2 < 3)
 and   (B.key1 < 500000 or B.key2 < 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	A	index_merge	i1,i2	i1,i2	4,4	NULL	1013	Using sort_union(i1,i2); Using where
-1	SIMPLE	B	index_merge	i1,i2	i1,i2	4,4	NULL	1013	Using sort_union(i1,i2); Using where; Using join buffer
+1	SIMPLE	B	index_merge	i1,i2	i1,i2	4,4	NULL	1013	Using sort_union(i1,i2); Using where; Using join buffer (flat, BNL join)
 select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
 from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
 where (A.key1 < 500000 or A.key2 < 3)
@@ -362,7 +362,7 @@ where (A.key1 = 1 or A.key2 = 1)
 and   (B.key1 = 1 or B.key2 = 1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	A	index_merge	i1,i2	i1,i2	4,4	NULL	1020	Using union(i1,i2); Using where
-1	SIMPLE	B	index_merge	i1,i2	i1,i2	4,4	NULL	1020	Using union(i1,i2); Using where; Using join buffer
+1	SIMPLE	B	index_merge	i1,i2	i1,i2	4,4	NULL	1020	Using union(i1,i2); Using where; Using join buffer (flat, BNL join)
 select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
 from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
 where (A.key1 = 1 or A.key2 = 1)
@@ -377,7 +377,7 @@ where (A.key1 = 1 and A.key2 = 1 and A.key3 = 1 and A.key4=1 and A.key5=1 and A.
 and (B.key1 = 1 and B.key2 = 1 and B.key3 = 1 and B.key4=1 and B.key5=1 and B.key6=1 and B.key7 = 1 or B.key8=1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	A	index_merge	i1,i2,i3,i4,i5,i6,i7?,i8	i2,i3,i4,i5,i6,i7?,i8	X	NULL	#	Using union(intersect(i2,i3,i4,i5,i6,i7?),i8); Using where
-1	SIMPLE	B	index_merge	i1,i2,i3,i4,i5,i6,i7?,i8	i2,i3,i4,i5,i6,i7?,i8	X	NULL	#	Using union(intersect(i2,i3,i4,i5,i6,i7?),i8); Using where; Using join buffer
+1	SIMPLE	B	index_merge	i1,i2,i3,i4,i5,i6,i7?,i8	i2,i3,i4,i5,i6,i7?,i8	X	NULL	#	Using union(intersect(i2,i3,i4,i5,i6,i7?),i8); Using where; Using join buffer (flat, BNL join)
 select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
 from t0 as A, t0 as B
 where (A.key1 = 1 and A.key2 = 1 and A.key3 = 1 and A.key4=1 and A.key5=1 and A.key6=1 and A.key7 = 1 or A.key8=1)

mysql-test/r/information_schema.result

@@ -324,7 +324,7 @@ information_schema.SCHEMATA b where
 a.ROUTINE_SCHEMA = b.SCHEMA_NAME;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	#	ALL	NULL	NULL	NULL	NULL	NULL	
-1	SIMPLE	#	ALL	NULL	NULL	NULL	NULL	NULL	Using where; Using join buffer
+1	SIMPLE	#	ALL	NULL	NULL	NULL	NULL	NULL	Using where; Using join buffer (flat, BNL join)
 select a.ROUTINE_NAME, b.name from information_schema.ROUTINES a,
 mysql.proc b where a.ROUTINE_NAME = convert(b.name using utf8) AND a.ROUTINE_SCHEMA='test' order by 1;
 ROUTINE_NAME	name
@@ -1450,7 +1450,7 @@ from information_schema.tables a, information_schema.columns b
 where a.table_name='t1' and a.table_schema='test' and b.table_name=a.table_name;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	a	ALL	NULL	TABLE_SCHEMA,TABLE_NAME	NULL	NULL	NULL	Using where; Skip_open_table; Scanned 0 databases
-1	SIMPLE	b	ALL	NULL	NULL	NULL	NULL	NULL	Using where; Open_frm_only; Scanned all databases; Using join buffer
+1	SIMPLE	b	ALL	NULL	NULL	NULL	NULL	NULL	Using where; Open_frm_only; Scanned all databases; Using join buffer (flat, BNL join)
 SELECT * FROM INFORMATION_SCHEMA.SCHEMATA
 WHERE SCHEMA_NAME = 'mysqltest';
 CATALOG_NAME	SCHEMA_NAME	DEFAULT_CHARACTER_SET_NAME	DEFAULT_COLLATION_NAME	SQL_PATH

mysql-test/r/join.result

@@ -404,7 +404,7 @@ SELECT STRAIGHT_JOIN t2.e FROM t1,t2 WHERE t2.d=1 AND t1.b=t2.e
 ORDER BY t1.b, t1.c;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	32	Using temporary; Using filesort
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	16	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	16	Using where; Using join buffer (flat, BNL join)
 SELECT STRAIGHT_JOIN t2.e FROM t1,t2 WHERE t2.d=1 AND t1.b=t2.e
 ORDER BY t1.b, t1.c;
 e
@@ -846,7 +846,7 @@ select * from t1, t2, t3 where t3.a=t1.a and t2.a=t1.b;
 a	b	a	a
 explain select * from t1, t2, t3 where t3.a=t1.a and t2.a=t1.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using where
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.b	1	Using index
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using index
 We expect rnd_next=5, and read_key must be 0 because of short-cutting:
@@ -889,8 +889,8 @@ Z
 vv: Following query must use ALL(t1), eq_ref(A), eq_ref(B): vv
 explain select * from t1, t2 A, t2 B where A.a = t1.a and B.a=A.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	10	
-1	SIMPLE	A	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	10	Using where
+1	SIMPLE	A	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where
 1	SIMPLE	B	eq_ref	PRIMARY	PRIMARY	4	test.A.b	1	
 show status like '%cost%';
 Variable_name	Value
@@ -910,7 +910,7 @@ INSERT INTO t1 SELECT a + 64, b FROM t1;
 INSERT INTO t2 SELECT a, b FROM t1;
 EXPLAIN SELECT * FROM t1 JOIN t2 ON b=c ORDER BY a LIMIT 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	index	NULL	PRIMARY	4	NULL	2	
+1	SIMPLE	t1	index	NULL	PRIMARY	4	NULL	2	Using where
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.b	1	
 EXPLAIN SELECT * FROM t1 JOIN t2 ON a=c ORDER BY a LIMIT 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -924,7 +924,7 @@ a	b	c	d
 2	NULL	2	NULL
 EXPLAIN SELECT * FROM t1 JOIN t2 ON b=c ORDER BY a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	128	Using filesort
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	128	Using where; Using filesort
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.b	1	
 EXPLAIN SELECT * FROM t1 JOIN t2 ON a=c ORDER BY a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -1095,11 +1095,11 @@ ON t4.a = t5.a
 ON t1.a = t3.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
-1	SIMPLE	t3	ref	a	a	5	test.t1.a	2	Using index
+1	SIMPLE	t3	ref	a	a	5	test.t1.a	2	Using where; Using index
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	0	Using where
 1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	0	Using where
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	0	Using where
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10	Using where; Using join buffer (flat, BNL join)
 SELECT * 
 FROM 
 t1 JOIN t2 ON t1.a = t2.a 
@@ -1220,4 +1220,34 @@ f1
 2
 DEALLOCATE PREPARE stmt;
 DROP TABLE t1;
+#
+# BUG#47217 Lost optimization caused slowdown & wrong result.
+#
+CREATE TABLE t1 (pk INT, v VARCHAR(2), PRIMARY KEY(pk));
+CREATE INDEX ix1 ON t1(v);
+CREATE TABLE t2 (pk INT, v VARCHAR(2), PRIMARY KEY(pk));
+CREATE INDEX ix2 ON t2(v);
+INSERT INTO t1 VALUES (1,'a'),(2,NULL);
+INSERT INTO t2 VALUES (1,NULL);
+EXPLAIN SELECT * FROM t1 JOIN t2 ON t1.v = t2.v ORDER BY 1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+EXPLAIN SELECT * FROM t1 JOIN t2 ON t1.v = t2.v;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+INSERT INTO t1 VALUES (3,'b'),(4,NULL),(5,'c'),(6,'cc'),(7,'d'),
+(8,'dd'),(9,'e'),(10,'ee');
+INSERT INTO t2 VALUES (2,NULL);
+FLUSH STATUS;
+SELECT * FROM t1 JOIN t2 ON t1.v = t2.v WHERE t2.v IS NULL ORDER BY 1;
+pk	v	pk	v
+SHOW STATUS LIKE 'Handler_read_%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	1
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	1
+DROP TABLE t1, t2;
 End of 5.1 tests

mysql-test/r/join_outer.result

@@ -1335,7 +1335,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	tt6	ALL	NULL	NULL	NULL	NULL	2	Using where
 1	SIMPLE	tt7	ALL	NULL	NULL	NULL	NULL	2	Using where
 1	SIMPLE	tt8	ALL	NULL	NULL	NULL	NULL	2	Using where
-1	SIMPLE	tt9	ALL	NULL	NULL	NULL	NULL	2	Using join buffer
+1	SIMPLE	tt9	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
 SET optimizer_search_depth = DEFAULT;
 DROP TABLE t1;
 #
@@ -1354,7 +1354,7 @@ EXPLAIN SELECT STRAIGHT_JOIN COUNT(*) FROM t1 TA1
 RIGHT JOIN t2 TA2 JOIN t2 TA3 ON TA2.f1 ON TA3.f1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	TA2	ALL	NULL	NULL	NULL	NULL	20	Using where
-1	SIMPLE	TA3	ALL	NULL	NULL	NULL	NULL	20	Using join buffer
+1	SIMPLE	TA3	ALL	NULL	NULL	NULL	NULL	20	Using join buffer (flat, BNL join)
 1	SIMPLE	TA1	ALL	NULL	NULL	NULL	NULL	2	Using where
 DROP TABLE t1, t2;
 #
@@ -1502,12 +1502,13 @@ sum(t3.b)
 show status like "handler_read%";
 Variable_name	Value
 Handler_read_first	0
-Handler_read_key	1048580
+Handler_read_key	4
 Handler_read_next	5
 Handler_read_prev	0
 Handler_read_rnd	0
 Handler_read_rnd_next	1048581
 drop table t1,t2,t3;
+#
 # Bug#57688 Assertion `!table || (!table->write_set || bitmap_is_set(table->write_set, field
 #
 CREATE TABLE t1 (f1 INT NOT NULL, PRIMARY KEY (f1));

mysql-test/r/key_cache.result

@@ -645,7 +645,7 @@ i
 3
 explain select count(*) from t1, t2 where t1.p = t2.i;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	index	k1	k1	5	NULL	1024	Using index
+1	SIMPLE	t2	index	k1	k1	5	NULL	1024	Using where; Using index
 1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.i	1	Using index
 select count(*) from t1, t2 where t1.p = t2.i;
 count(*)

mysql-test/r/key_diff.result

@@ -36,7 +36,7 @@ a	a	a	a
 explain select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	
-1	SIMPLE	t2	ALL	b	NULL	NULL	NULL	5	Using where; Using join buffer
+1	SIMPLE	t2	ALL	b	NULL	NULL	NULL	5	Using where; Using join buffer (flat, BNL join)
 select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B order by binary t1.a,t2.a;
 a	b	a	b
 A	B	a	a

mysql-test/r/maria_mrr.result

@@ -321,8 +321,8 @@ SELECT COUNT(t1.v) FROM t1, t2 IGNORE INDEX (idx), t3 IGNORE INDEX (idx)
 WHERE t3.v = t2.v AND t3.i < t2.i AND t3.pk > 0 AND t2.pk > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	index	NULL	idx	7	NULL	15	Using index
-1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	16	Using where; Using join buffer
-1	SIMPLE	t3	ALL	PRIMARY	NULL	NULL	NULL	17	Using where; Using join buffer
+1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	16	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t3	ALL	PRIMARY	NULL	NULL	NULL	17	Using where; Using join buffer (flat, BNL join)
 SELECT COUNT(t1.v) FROM t1, t2, t3 
 WHERE t3.v = t2.v AND t3.i < t2.i AND t3.pk > 0 AND t2.pk > 0;
 COUNT(t1.v)
@@ -332,7 +332,7 @@ SELECT COUNT(t1.v) FROM t1, t2, t3
 WHERE t3.v = t2.v AND t3.i < t2.i AND t3.pk > 0 AND t2.pk > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	index	NULL	idx	7	NULL	15	Using index
-1	SIMPLE	t2	ALL	PRIMARY,idx	NULL	NULL	NULL	16	Using where; Using join buffer
+1	SIMPLE	t2	ALL	PRIMARY,idx	NULL	NULL	NULL	16	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t3	ref	PRIMARY,idx	idx	3	test.t2.v	2	Using index condition; Using where
 DROP TABLE t1,t2,t3;
 #
@@ -383,7 +383,7 @@ SELECT t1.i, t2.i, t2.v, t3.pk, t3.v FROM t1, t2, t2 t3
 WHERE t2.i != 0 AND t3.pk >= t2.i AND t3.v >= t2.v;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	index	NULL	i	4	NULL	2	Using index
-1	SIMPLE	t2	index	i,vi	vi	7	NULL	3	Using where; Using index; Using join buffer
+1	SIMPLE	t2	index	i,vi	vi	7	NULL	3	Using where; Using index; Using join buffer (flat, BNL join)
 1	SIMPLE	t3	ALL	PRIMARY,vi	NULL	NULL	NULL	3	Range checked for each record (index map: 0x5)
 SELECT t1.i, t2.i, t2.v, t3.pk, t3.v FROM t1, t2, t2 t3
 WHERE t2.i != 0 AND t3.pk >= t2.i AND t3.v >= t2.v;

mysql-test/r/myisam.result

@@ -346,23 +346,23 @@ t1	1	c_2	2	a	A	5	NULL	NULL		BTREE
 explain select * from t1,t2 where t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	2	
-1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where; Using join buffer
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where; Using join buffer (flat, BNL join)
 explain select * from t1,t2 force index(a) where t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	2	
-1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where; Using join buffer
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where; Using join buffer (flat, BNL join)
 explain select * from t1 force index(a),t2 force index(a) where t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	2	
 1	SIMPLE	t1	ref	a	a	4	test.t2.a	3	
 explain select * from t1,t2 where t1.b=t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	b	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	b	NULL	NULL	NULL	2	Using where
 1	SIMPLE	t1	ref	b	b	5	test.t2.b	1	
 explain select * from t1,t2 force index(c) where t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
-1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where; Using join buffer
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where; Using join buffer (flat, BNL join)
 explain select * from t1 where a=0 or a=2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where

mysql-test/r/null_key.result

@@ -178,12 +178,12 @@ create table t2 (a int);
 insert into t2 values (7),(8);
 explain select * from t2 straight_join t1 where t1.a=t2.a and b is null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 1	SIMPLE	t1	ref	a,b	a	10	test.t2.a,const	2	Using where; Using index
 drop index b on t1;
 explain select * from t2,t1 where t1.a=t2.a and b is null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 1	SIMPLE	t1	ref	a	a	10	test.t2.a,const	2	Using where; Using index
 select * from t2,t1 where t1.a=t2.a and b is null;
 a	a	b
@@ -191,7 +191,7 @@ a	a	b
 8	8	NULL
 explain select * from t2,t1 where t1.a=t2.a and (b= 7 or b is null);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 1	SIMPLE	t1	ref_or_null	a	a	10	test.t2.a,const	4	Using index
 select * from t2,t1 where t1.a=t2.a and (b= 7 or b is null);
 a	a	b
@@ -407,8 +407,8 @@ EXPLAIN SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
 LEFT JOIN t3 ON t2.b=t3.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	
-1	SIMPLE	t2	ref	idx	idx	5	test.t1.a	1	
-1	SIMPLE	t3	ref	idx	idx	5	test.t2.b	1	Using index
+1	SIMPLE	t2	ref	idx	idx	5	test.t1.a	1	Using where
+1	SIMPLE	t3	ref	idx	idx	5	test.t2.b	1	Using where; Using index
 FLUSH STATUS ;
 SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
 LEFT JOIN t3 ON t2.b=t3.b;

mysql-test/r/order_by.result

@@ -1489,7 +1489,7 @@ SELECT d FROM t1, t2
 WHERE t2.b=14 AND t2.a=t1.a AND 5.1<t2.c AND t1.b='DE'
 ORDER BY t2.c LIMIT 1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ref	a,b	b	4	const	4	Using index condition; Using temporary; Using filesort
+1	SIMPLE	t1	ref	a,b	b	4	const	4	Using index condition; Using where; Using temporary; Using filesort
 1	SIMPLE	t2	ref	a,b,c	a	40	test.t1.a,const	11	Using index condition
 SELECT d FROM t1, t2
 WHERE t2.b=14 AND t2.a=t1.a AND 5.1<t2.c AND t1.b='DE'
@@ -1608,19 +1608,19 @@ EXPLAIN
 SELECT * FROM t1 FORCE INDEX FOR ORDER BY (a), t2 WHERE t1.a < 2 ORDER BY t1.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	range	a	a	5	NULL	2	Using index condition; Using MRR; Using temporary; Using filesort
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10	Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10	Using join buffer (flat, BNL join)
 # should have "using filesort"
 EXPLAIN 
 SELECT * FROM t1 USE INDEX FOR ORDER BY (a), t2 WHERE t1.a < 2 ORDER BY t1.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	range	a	a	5	NULL	2	Using index condition; Using MRR; Using temporary; Using filesort
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10	Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10	Using join buffer (flat, BNL join)
 # should have "using filesort"
 EXPLAIN 
 SELECT * FROM t1 FORCE INDEX FOR JOIN (a), t2 WHERE t1.a < 2 ORDER BY t1.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	range	a	a	5	NULL	2	Using index condition; Using MRR; Using temporary; Using filesort
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10	Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10	Using join buffer (flat, BNL join)
 DROP TABLE t1, t2;
 #
 # Bug #50394: Regression in EXPLAIN with index scan, LIMIT, GROUP BY and

mysql-test/r/pool_of_threads.result

@@ -1429,7 +1429,7 @@ companynr	companynr
 explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer (flat, BNL join)
 select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
 fld1	companynr	fld3	period
 038008	37	reporters	1008

mysql-test/r/range.result

@@ -221,27 +221,27 @@ update t1 set y=x;
 explain select * from t1, t1 t2 where t1.y = 8 and t2.x between 7 and t1.y+0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Using MRR; Using join buffer
+1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Using MRR; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 8 and t2.x >= 7 and t2.x <= t1.y+0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Using MRR; Using join buffer
+1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Using MRR; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x between t1.y-1 and t1.y+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	3	Using index condition; Using MRR; Using join buffer
+1	SIMPLE	t2	range	x	x	5	NULL	3	Using index condition; Using MRR; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x >= t1.y-1 and t2.x <= t1.y+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	3	Using index condition; Using MRR; Using join buffer
+1	SIMPLE	t2	range	x	x	5	NULL	3	Using index condition; Using MRR; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x between 0 and t1.y;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Using MRR; Using join buffer
+1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Using MRR; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x >= 0 and t2.x <= t1.y;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Using MRR; Using join buffer
+1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Using MRR; Using join buffer (flat, BNL join)
 explain select count(*) from t1 where x in (1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	x	x	5	const	1	Using index
@@ -256,12 +256,12 @@ INSERT INTO t2 VALUES (0),(0),(1),(1),(2),(2);
 explain select * from t1, t2 where (t1.key1 <t2.keya + 1) and t2.keya=3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ref	j1	j1	4	const	1	Using index
-1	SIMPLE	t1	index	i1	i1	4	NULL	7	Using where; Using index; Using join buffer
+1	SIMPLE	t1	index	i1	i1	4	NULL	7	Using where; Using index; Using join buffer (flat, BNL join)
 explain select * from t1 force index(i1), t2 force index(j1) where 
 (t1.key1 <t2.keya + 1) and t2.keya=3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ref	j1	j1	4	const	1	Using index
-1	SIMPLE	t1	index	i1	i1	4	NULL	7	Using where; Using index; Using join buffer
+1	SIMPLE	t1	index	i1	i1	4	NULL	7	Using where; Using index; Using join buffer (flat, BNL join)
 DROP TABLE t1,t2;
 CREATE TABLE t1 (
 a int(11) default NULL,

mysql-test/r/row.result

@@ -377,7 +377,7 @@ a	b	a	b	c
 EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t1.a-1,t1.b)=(t2.a-1,t2.b+1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	t1	index	NULL	PRIMARY	8	NULL	6	100.00	Using index
-1	SIMPLE	t2	index	NULL	PRIMARY	12	NULL	7	100.00	Using where; Using index; Using join buffer
+1	SIMPLE	t2	index	NULL	PRIMARY	12	NULL	7	100.00	Using where; Using index; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where (((`test`.`t1`.`a` - 1) = (`test`.`t2`.`a` - 1)) and (`test`.`t1`.`b` = (`test`.`t2`.`b` + 1)))
 SELECT * FROM t1,t2 WHERE (t1.a-1,t1.b)=(t2.a-1,t2.b+1);

mysql-test/r/select.result

@@ -1431,7 +1431,7 @@ companynr	companynr
 explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer (flat, BNL join)
 select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
 fld1	companynr	fld3	period
 038008	37	reporters	1008
@@ -2363,7 +2363,7 @@ insert into t2 values (1,3), (2,3), (3,4), (4,4);
 explain select * from t1 left join t2 on a=c where d in (4);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ref	c,d	d	5	const	2	
-1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer (flat, BNL join)
 select * from t1 left join t2 on a=c where d in (4);
 a	b	c	d
 3	2	3	4
@@ -2371,7 +2371,7 @@ a	b	c	d
 explain select * from t1 left join t2 on a=c where d = 4;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ref	c,d	d	5	const	2	
-1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer (flat, BNL join)
 select * from t1 left join t2 on a=c where d = 4;
 a	b	c	d
 3	2	3	4
@@ -2717,7 +2717,7 @@ where (t1.c=t2.a or (t1.c=t3.a and t2.a=t3.b)) and t1.b=556476786 and
 t2.b like '%%' order by t2.b limit 0,1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	b,c	b	5	const	1	Using temporary; Using filesort
-1	SIMPLE	t3	index	PRIMARY,a,b	PRIMARY	8	NULL	2	Using index; Using join buffer
+1	SIMPLE	t3	index	PRIMARY,a,b	PRIMARY	8	NULL	2	Using index; Using join buffer (flat, BNL join)
 1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	2	Range checked for each record (index map: 0x1)
 DROP TABLE t1,t2,t3;
 CREATE TABLE t1 (a int, INDEX idx(a));
@@ -2738,7 +2738,7 @@ ALTER TABLE t1 ENABLE KEYS;
 EXPLAIN SELECT STRAIGHT_JOIN SQL_NO_CACHE COUNT(*) FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	index	b	b	5	NULL	2	Using index
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 SELECT STRAIGHT_JOIN SQL_NO_CACHE * FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
 a	b	a	b
 1	NULL	1	1
@@ -2748,7 +2748,7 @@ a	b	a	b
 EXPLAIN SELECT STRAIGHT_JOIN SQL_NO_CACHE COUNT(*) FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	index	b	b	5	NULL	2	Using index
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 SELECT STRAIGHT_JOIN SQL_NO_CACHE * FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
 a	b	a	b
 1	NULL	1	1
@@ -2910,11 +2910,11 @@ a
 EXPLAIN SELECT t1.a FROM t1 STRAIGHT_JOIN t2 ON t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 EXPLAIN SELECT t1.a FROM t1 INNER JOIN t2 ON t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	Using where; Using join buffer
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	Using where; Using join buffer (flat, BNL join)
 DROP TABLE t1,t2;
 select x'10' + 0, X'10' + 0, b'10' + 0, B'10' + 0;
 x'10' + 0	X'10' + 0	b'10' + 0	B'10' + 0
@@ -3562,19 +3562,19 @@ EXPLAIN SELECT t2.*
 FROM t1 JOIN t2 ON t2.fk=t1.pk
 WHERE t2.fk < 'c' AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	3	Using index condition; Using where; Using MRR
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where
 EXPLAIN SELECT t2.* 
 FROM t1 JOIN t2 ON t2.fk=t1.pk 
 WHERE t2.fk BETWEEN 'a' AND 'b' AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Using MRR
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where
 EXPLAIN SELECT t2.* 
 FROM t1 JOIN t2 ON t2.fk=t1.pk 
 WHERE t2.fk IN ('a','b') AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Using MRR
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where
 DROP TABLE t1,t2;
 CREATE TABLE t1 (a int, b varchar(20) NOT NULL, PRIMARY KEY(a));
@@ -3608,7 +3608,7 @@ WHERE t1.id = 8 AND t2.i BETWEEN t1.b AND t1.e AND
 t3.a=t2.a AND t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si	si	5	NULL	4	Using index condition; Using MRR
+1	SIMPLE	t2	range	si	si	5	NULL	4	Using index condition; Using where; Using MRR
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 EXPLAIN
 SELECT t3.a FROM t1,t2,t3
@@ -3616,7 +3616,7 @@ WHERE t1.id = 8 AND t2.i BETWEEN t1.b AND t1.e AND
 t3.a=t2.a AND t3.c IN ('bb','ee') ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si,ai	si	5	NULL	4	Using index condition; Using MRR
+1	SIMPLE	t2	range	si,ai	si	5	NULL	4	Using index condition; Using where; Using MRR
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 EXPLAIN 
 SELECT t3.a FROM t1,t2 FORCE INDEX (si),t3
@@ -3624,7 +3624,7 @@ WHERE t1.id = 8 AND (t2.i=t1.b OR t2.i=t1.e) AND t3.a=t2.a AND
 t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si	si	5	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t2	range	si	si	5	NULL	2	Using index condition; Using where; Using MRR
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 EXPLAIN 
 SELECT t3.a FROM t1,t2,t3
@@ -3632,7 +3632,7 @@ WHERE t1.id = 8 AND (t2.i=t1.b OR t2.i=t1.e) AND t3.a=t2.a AND
 t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si,ai	si	5	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t2	range	si,ai	si	5	NULL	2	Using index condition; Using where; Using MRR
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 DROP TABLE t1,t2,t3;
 CREATE TABLE t1 ( f1 int primary key, f2 int, f3 int, f4 int, f5 int, f6 int, checked_out int);

mysql-test/r/select_pkeycache.result

@@ -1431,7 +1431,7 @@ companynr	companynr
 explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer (flat, BNL join)
 select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
 fld1	companynr	fld3	period
 038008	37	reporters	1008
@@ -2363,7 +2363,7 @@ insert into t2 values (1,3), (2,3), (3,4), (4,4);
 explain select * from t1 left join t2 on a=c where d in (4);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ref	c,d	d	5	const	2	
-1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer (flat, BNL join)
 select * from t1 left join t2 on a=c where d in (4);
 a	b	c	d
 3	2	3	4
@@ -2371,7 +2371,7 @@ a	b	c	d
 explain select * from t1 left join t2 on a=c where d = 4;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ref	c,d	d	5	const	2	
-1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer (flat, BNL join)
 select * from t1 left join t2 on a=c where d = 4;
 a	b	c	d
 3	2	3	4
@@ -2717,7 +2717,7 @@ where (t1.c=t2.a or (t1.c=t3.a and t2.a=t3.b)) and t1.b=556476786 and
 t2.b like '%%' order by t2.b limit 0,1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	b,c	b	5	const	1	Using temporary; Using filesort
-1	SIMPLE	t3	index	PRIMARY,a,b	PRIMARY	8	NULL	2	Using index; Using join buffer
+1	SIMPLE	t3	index	PRIMARY,a,b	PRIMARY	8	NULL	2	Using index; Using join buffer (flat, BNL join)
 1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	2	Range checked for each record (index map: 0x1)
 DROP TABLE t1,t2,t3;
 CREATE TABLE t1 (a int, INDEX idx(a));
@@ -2738,7 +2738,7 @@ ALTER TABLE t1 ENABLE KEYS;
 EXPLAIN SELECT STRAIGHT_JOIN SQL_NO_CACHE COUNT(*) FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	index	b	b	5	NULL	2	Using index
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 SELECT STRAIGHT_JOIN SQL_NO_CACHE * FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
 a	b	a	b
 1	NULL	1	1
@@ -2748,7 +2748,7 @@ a	b	a	b
 EXPLAIN SELECT STRAIGHT_JOIN SQL_NO_CACHE COUNT(*) FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	index	b	b	5	NULL	2	Using index
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 SELECT STRAIGHT_JOIN SQL_NO_CACHE * FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
 a	b	a	b
 1	NULL	1	1
@@ -2910,11 +2910,11 @@ a
 EXPLAIN SELECT t1.a FROM t1 STRAIGHT_JOIN t2 ON t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 EXPLAIN SELECT t1.a FROM t1 INNER JOIN t2 ON t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	Using where; Using join buffer
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	Using where; Using join buffer (flat, BNL join)
 DROP TABLE t1,t2;
 select x'10' + 0, X'10' + 0, b'10' + 0, B'10' + 0;
 x'10' + 0	X'10' + 0	b'10' + 0	B'10' + 0
@@ -3562,19 +3562,19 @@ EXPLAIN SELECT t2.*
 FROM t1 JOIN t2 ON t2.fk=t1.pk
 WHERE t2.fk < 'c' AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	3	Using index condition; Using where; Using MRR
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where
 EXPLAIN SELECT t2.* 
 FROM t1 JOIN t2 ON t2.fk=t1.pk 
 WHERE t2.fk BETWEEN 'a' AND 'b' AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Using MRR
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where
 EXPLAIN SELECT t2.* 
 FROM t1 JOIN t2 ON t2.fk=t1.pk 
 WHERE t2.fk IN ('a','b') AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Using MRR
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where
 DROP TABLE t1,t2;
 CREATE TABLE t1 (a int, b varchar(20) NOT NULL, PRIMARY KEY(a));
@@ -3608,7 +3608,7 @@ WHERE t1.id = 8 AND t2.i BETWEEN t1.b AND t1.e AND
 t3.a=t2.a AND t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si	si	5	NULL	4	Using index condition; Using MRR
+1	SIMPLE	t2	range	si	si	5	NULL	4	Using index condition; Using where; Using MRR
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 EXPLAIN
 SELECT t3.a FROM t1,t2,t3
@@ -3616,7 +3616,7 @@ WHERE t1.id = 8 AND t2.i BETWEEN t1.b AND t1.e AND
 t3.a=t2.a AND t3.c IN ('bb','ee') ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si,ai	si	5	NULL	4	Using index condition; Using MRR
+1	SIMPLE	t2	range	si,ai	si	5	NULL	4	Using index condition; Using where; Using MRR
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 EXPLAIN 
 SELECT t3.a FROM t1,t2 FORCE INDEX (si),t3
@@ -3624,7 +3624,7 @@ WHERE t1.id = 8 AND (t2.i=t1.b OR t2.i=t1.e) AND t3.a=t2.a AND
 t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si	si	5	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t2	range	si	si	5	NULL	2	Using index condition; Using where; Using MRR
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 EXPLAIN 
 SELECT t3.a FROM t1,t2,t3
@@ -3632,7 +3632,7 @@ WHERE t1.id = 8 AND (t2.i=t1.b OR t2.i=t1.e) AND t3.a=t2.a AND
 t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si,ai	si	5	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t2	range	si,ai	si	5	NULL	2	Using index condition; Using where; Using MRR
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 DROP TABLE t1,t2,t3;
 CREATE TABLE t1 ( f1 int primary key, f2 int, f3 int, f4 int, f5 int, f6 int, checked_out int);

mysql-test/r/select_safe.result

@@ -66,12 +66,12 @@ test.t1	analyze	status	OK
 insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a");
 explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	b	NULL	NULL	NULL	21	
+1	SIMPLE	t1	ALL	b	NULL	NULL	NULL	21	Using where
 1	SIMPLE	t2	ref	b	b	21	test.t1.b	6	
 set MAX_SEEKS_FOR_KEY=1;
 explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	b	NULL	NULL	NULL	21	
+1	SIMPLE	t1	ALL	b	NULL	NULL	NULL	21	Using where
 1	SIMPLE	t2	ref	b	b	21	test.t1.b	6	
 SET MAX_SEEKS_FOR_KEY=DEFAULT;
 drop table t1;

mysql-test/r/ssl.result

@@ -1432,7 +1432,7 @@ companynr	companynr
 explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer (flat, BNL join)
 select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
 fld1	companynr	fld3	period
 038008	37	reporters	1008

mysql-test/r/ssl_compress.result

@@ -1435,7 +1435,7 @@ companynr	companynr
 explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer (flat, BNL join)
 select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
 fld1	companynr	fld3	period
 038008	37	reporters	1008

mysql-test/r/subselect.result

@@ -907,7 +907,7 @@ explain extended SELECT t1.a, t1.a in (select t2.a from t2,t3 where t3.a=t2.a) F
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	index	NULL	PRIMARY	4	NULL	4	100.00	Using index
 2	DEPENDENT SUBQUERY	t2	ref_or_null	a	a	5	func	2	100.00	Using index
-2	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+2	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,<expr_cache><`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`a`,<exists>(select 1 from `test`.`t2` join `test`.`t3` where ((`test`.`t3`.`a` = `test`.`t2`.`a`) and ((<cache>(`test`.`t1`.`a`) = `test`.`t2`.`a`) or isnull(`test`.`t2`.`a`))) having <is_not_null_test>(`test`.`t2`.`a`)))) AS `t1.a in (select t2.a from t2,t3 where t3.a=t2.a)` from `test`.`t1`
 drop table t1,t2,t3;
@@ -1297,7 +1297,7 @@ 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	index	PRIMARY	PRIMARY	4	NULL	4	75.00	Using where; Using index; Using join buffer
+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);
@@ -1307,7 +1307,7 @@ 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	ALL	PRIMARY	NULL	NULL	NULL	4	75.00	Using where; Using join buffer
+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);
@@ -1317,7 +1317,7 @@ 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	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
-1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	75.00	Using where; Using join buffer
+1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	75.00	Using where; Using join buffer (flat, BNL join)
 1	PRIMARY	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.b	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`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t3`.`a` = `test`.`t1`.`b`))
@@ -1339,7 +1339,7 @@ a
 4
 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	a	a	5	NULL	4	100.00	Using index
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
 1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where (`test`.`t1`.`a` = `test`.`t2`.`a`)
@@ -1349,7 +1349,7 @@ a
 4
 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	a	a	5	NULL	4	100.00	Using index
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
 1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using where; Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` <> 30))
@@ -1359,8 +1359,8 @@ 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	a	a	5	NULL	4	100.00	Using index
-1	PRIMARY	t3	index	a	a	5	NULL	3	100.00	Using index
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
+1	PRIMARY	t3	index	a	a	5	NULL	3	100.00	Using where; Using index
 1	PRIMARY	t1	ref	a	a	10	test.t2.a,test.t3.a	116	100.61	Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1` join `test`.`t3`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` = `test`.`t3`.`a`))
@@ -1376,7 +1376,7 @@ a
 4
 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	a	a	5	NULL	4	100.00	Using index
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
 1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using where; Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` <> 30))
@@ -2831,9 +2831,10 @@ Note	1003	select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two`,<expr_cac
 explain extended SELECT one,two from t1 where ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = 'N');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	8	100.00	
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	9	100.00	Using where; FirstMatch(t1)
+1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	10	func	1	1.00	
+2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	9	100.00	Using where
 Warnings:
-Note	1003	select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`two` = `test`.`t1`.`two`) and (`test`.`t2`.`one` = `test`.`t1`.`one`) and (`test`.`t2`.`flag` = 'N'))
+Note	1003	select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`flag` = 'N'))
 explain extended SELECT one,two,ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = '0' group by one,two) as 'test' from t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	8	100.00	
@@ -4203,8 +4204,8 @@ CREATE INDEX I1 ON t1 (a);
 CREATE INDEX I2 ON t1 (b);
 EXPLAIN SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1	index	I1	I1	2	NULL	2	Using index; LooseScan
-1	PRIMARY	t1	ref	I2	I2	13	test.t1.a	2	Using index condition
+1	PRIMARY	t1	ALL	I2	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t1	ref	I1	I1	2	test.t1.b	2	Using where; Using index; FirstMatch(t1)
 SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1);
 a	b
 CREATE TABLE t2 (a VARCHAR(1), b VARCHAR(10));
@@ -4213,15 +4214,15 @@ CREATE INDEX I1 ON t2 (a);
 CREATE INDEX I2 ON t2 (b);
 EXPLAIN SELECT a,b FROM t2 WHERE b IN (SELECT a FROM t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t2	index	I1	I1	4	NULL	2	Using index; LooseScan
-1	PRIMARY	t2	ref	I2	I2	13	test.t2.a	2	Using index condition
+1	PRIMARY	t2	ALL	I2	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t2	ref	I1	I1	4	test.t2.b	2	Using where; Using index; FirstMatch(t2)
 SELECT a,b FROM t2 WHERE b IN (SELECT a FROM t2);
 a	b
 EXPLAIN
 SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1 WHERE LENGTH(a)<500);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1	index	I1	I1	2	NULL	2	Using where; Using index; LooseScan
-1	PRIMARY	t1	ref	I2	I2	13	test.t1.a	2	Using index condition
+1	PRIMARY	t1	ALL	I2	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t1	ref	I1	I1	2	test.t1.b	2	Using where; Using index; FirstMatch(t1)
 SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1 WHERE LENGTH(a)<500);
 a	b
 DROP TABLE t1,t2;

mysql-test/r/subselect4.result

@@ -51,7 +51,7 @@ FROM t3 WHERE 1 = 0 GROUP BY 1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
 2	DEPENDENT SUBQUERY	t1	index	NULL	PRIMARY	4	NULL	2	Using index
-2	DEPENDENT SUBQUERY	t2	index	b	b	5	NULL	2	Using where; Using index; Using join buffer
+2	DEPENDENT SUBQUERY	t2	index	b	b	5	NULL	2	Using where; Using index; Using join buffer (flat, BNL join)
 # should return 0 rows
 SELECT
 (SELECT 1 FROM t1,t2 WHERE t2.b > t3.b)
@@ -347,7 +347,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
 1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
 FROM t1
 WHERE EMPNUM IN
@@ -362,13 +362,13 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
 1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
 1	SIMPLE	subselect2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 DEALLOCATE PREPARE stmt;
 DROP INDEX t1_IDX ON t1;
 CREATE INDEX t1_IDX ON t1(EMPNUM);
@@ -385,7 +385,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
 1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
 FROM t1
 WHERE EMPNUM IN
@@ -400,13 +400,13 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
 1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
 1	SIMPLE	subselect2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 DEALLOCATE PREPARE stmt;
 DROP INDEX t1_IDX ON t1;
 EXPLAIN SELECT EMPNAME
@@ -422,7 +422,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
 1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
 FROM t1
 WHERE EMPNUM IN
@@ -437,13 +437,13 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
 1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
 1	SIMPLE	subselect2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
-2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
+2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 DEALLOCATE PREPARE stmt;
 SET SESSION optimizer_switch = @old_optimizer_switch;
 SET SESSION join_cache_level = @old_join_cache_level;

mysql-test/r/subselect_mat.result

@@ -423,7 +423,7 @@ where (c1, c2) in (select b1, b2 from t2i where b2 > '0')) and
 a1 = c1;
 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	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where; Using join buffer
+1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where; Using join buffer (flat, BNL join)
 4	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
 5	SUBQUERY	t2i	index	it2i2	it2i3	18	NULL	5	100.00	Using where; Using index
 2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
@@ -659,7 +659,7 @@ 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
 2	DEPENDENT SUBQUERY	t1_16	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 3	DEPENDENT SUBQUERY	t2_16	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
-3	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where; Using join buffer
+3	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where; Using join buffer (flat, BNL join)
 4	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
 Warnings:
 Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <expr_cache><concat(`test`.`t1`.`a1`,'x')>(<in_optimizer>(concat(`test`.`t1`.`a1`,'x'),<exists>(select 1 from `test`.`t1_16` where (<expr_cache><`test`.`t1_16`.`a2`,`test`.`t1_16`.`a1`>(<in_optimizer>((`test`.`t1_16`.`a1`,`test`.`t1_16`.`a2`),<exists>(select `test`.`t2_16`.`b1`,`test`.`t2_16`.`b2` from `test`.`t2_16` join `test`.`t2` where ((`test`.`t2`.`b2` = substr(`test`.`t2_16`.`b2`,1,6)) and <expr_cache><`test`.`t2`.`b1`>(<in_optimizer>(`test`.`t2`.`b1`,`test`.`t2`.`b1` in ( <materialize> (select `test`.`t3`.`c1` from `test`.`t3` where (`test`.`t3`.`c2` > '0') ), <primary_index_lookup>(`test`.`t2`.`b1` in <temporary table> on distinct_key where ((`test`.`t2`.`b1` = `materialized subselect`.`c1`)))))) and (<cache>(`test`.`t1_16`.`a1`) = `test`.`t2_16`.`b1`) and (<cache>(`test`.`t1_16`.`a2`) = `test`.`t2_16`.`b2`))))) and (<cache>(concat(`test`.`t1`.`a1`,'x')) = left(`test`.`t1_16`.`a1`,8))))))
@@ -1191,7 +1191,7 @@ SET @@optimizer_switch='default,semijoin=on,materialization=on';
 EXPLAIN SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	2	
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	
 SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2);
 COUNT(*)

mysql-test/r/subselect_no_mat.result

@@ -911,7 +911,7 @@ explain extended SELECT t1.a, t1.a in (select t2.a from t2,t3 where t3.a=t2.a) F
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	index	NULL	PRIMARY	4	NULL	4	100.00	Using index
 2	DEPENDENT SUBQUERY	t2	ref_or_null	a	a	5	func	2	100.00	Using index
-2	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+2	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,<expr_cache><`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`a`,<exists>(select 1 from `test`.`t2` join `test`.`t3` where ((`test`.`t3`.`a` = `test`.`t2`.`a`) and ((<cache>(`test`.`t1`.`a`) = `test`.`t2`.`a`) or isnull(`test`.`t2`.`a`))) having <is_not_null_test>(`test`.`t2`.`a`)))) AS `t1.a in (select t2.a from t2,t3 where t3.a=t2.a)` from `test`.`t1`
 drop table t1,t2,t3;
@@ -1301,7 +1301,7 @@ 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	index	PRIMARY	PRIMARY	4	NULL	4	75.00	Using where; Using index; Using join buffer
+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);
@@ -1311,7 +1311,7 @@ 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	ALL	PRIMARY	NULL	NULL	NULL	4	75.00	Using where; Using join buffer
+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);
@@ -1321,7 +1321,7 @@ 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	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
-1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	75.00	Using where; Using join buffer
+1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	75.00	Using where; Using join buffer (flat, BNL join)
 1	PRIMARY	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.b	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`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t3`.`a` = `test`.`t1`.`b`))
@@ -1343,7 +1343,7 @@ a
 4
 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	a	a	5	NULL	4	100.00	Using index
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
 1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where (`test`.`t1`.`a` = `test`.`t2`.`a`)
@@ -1353,7 +1353,7 @@ a
 4
 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	a	a	5	NULL	4	100.00	Using index
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
 1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using where; Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` <> 30))
@@ -1363,8 +1363,8 @@ 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	a	a	5	NULL	4	100.00	Using index
-1	PRIMARY	t3	index	a	a	5	NULL	3	100.00	Using index
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
+1	PRIMARY	t3	index	a	a	5	NULL	3	100.00	Using where; Using index
 1	PRIMARY	t1	ref	a	a	10	test.t2.a,test.t3.a	116	100.61	Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1` join `test`.`t3`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` = `test`.`t3`.`a`))
@@ -1380,7 +1380,7 @@ a
 4
 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	a	a	5	NULL	4	100.00	Using index
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
 1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using where; Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` <> 30))
@@ -4207,8 +4207,8 @@ CREATE INDEX I1 ON t1 (a);
 CREATE INDEX I2 ON t1 (b);
 EXPLAIN SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1	index	I1	I1	2	NULL	2	Using index; LooseScan
-1	PRIMARY	t1	ref	I2	I2	13	test.t1.a	2	Using index condition
+1	PRIMARY	t1	ALL	I2	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t1	ref	I1	I1	2	test.t1.b	2	Using where; Using index; FirstMatch(t1)
 SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1);
 a	b
 CREATE TABLE t2 (a VARCHAR(1), b VARCHAR(10));
@@ -4217,15 +4217,15 @@ CREATE INDEX I1 ON t2 (a);
 CREATE INDEX I2 ON t2 (b);
 EXPLAIN SELECT a,b FROM t2 WHERE b IN (SELECT a FROM t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t2	index	I1	I1	4	NULL	2	Using index; LooseScan
-1	PRIMARY	t2	ref	I2	I2	13	test.t2.a	2	Using index condition
+1	PRIMARY	t2	ALL	I2	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t2	ref	I1	I1	4	test.t2.b	2	Using where; Using index; FirstMatch(t2)
 SELECT a,b FROM t2 WHERE b IN (SELECT a FROM t2);
 a	b
 EXPLAIN
 SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1 WHERE LENGTH(a)<500);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1	index	I1	I1	2	NULL	2	Using where; Using index; LooseScan
-1	PRIMARY	t1	ref	I2	I2	13	test.t1.a	2	Using index condition
+1	PRIMARY	t1	ALL	I2	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t1	ref	I1	I1	2	test.t1.b	2	Using where; Using index; FirstMatch(t1)
 SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1 WHERE LENGTH(a)<500);
 a	b
 DROP TABLE t1,t2;

mysql-test/r/subselect_no_opts.result

@@ -908,7 +908,7 @@ explain extended SELECT t1.a, t1.a in (select t2.a from t2,t3 where t3.a=t2.a) F
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	index	NULL	PRIMARY	4	NULL	4	100.00	Using index
 2	DEPENDENT SUBQUERY	t2	ref_or_null	a	a	5	func	2	100.00	Using index
-2	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+2	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,<expr_cache><`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`a`,<exists>(select 1 from `test`.`t2` join `test`.`t3` where ((`test`.`t3`.`a` = `test`.`t2`.`a`) and ((<cache>(`test`.`t1`.`a`) = `test`.`t2`.`a`) or isnull(`test`.`t2`.`a`))) having <is_not_null_test>(`test`.`t2`.`a`)))) AS `t1.a in (select t2.a from t2,t3 where t3.a=t2.a)` from `test`.`t1`
 drop table t1,t2,t3;
@@ -1318,7 +1318,7 @@ 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	DEPENDENT SUBQUERY	t1	eq_ref	PRIMARY	PRIMARY	4	func	1	100.00	
+2	DEPENDENT SUBQUERY	t1	eq_ref	PRIMARY	PRIMARY	4	func	1	100.00	Using where
 2	DEPENDENT SUBQUERY	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.b	1	100.00	Using index
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` where <expr_cache><`test`.`t2`.`a`>(<in_optimizer>(`test`.`t2`.`a`,<exists>(select 1 from `test`.`t1` join `test`.`t3` where ((`test`.`t3`.`a` = `test`.`t1`.`b`) and (<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`)))))
@@ -1362,7 +1362,7 @@ explain extended select * from t2 where t2.a in (select t1.a from t1,t3 where t1
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	NULL	a	5	NULL	4	100.00	Using where; Using index
 2	DEPENDENT SUBQUERY	t1	ref	a	a	5	func	1001	100.00	Using index
-2	DEPENDENT SUBQUERY	t3	index	a	a	5	NULL	3	100.00	Using where; Using index; Using join buffer
+2	DEPENDENT SUBQUERY	t3	index	a	a	5	NULL	3	100.00	Using where; Using index; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` where <expr_cache><`test`.`t2`.`a`>(<in_optimizer>(`test`.`t2`.`a`,<exists>(select 1 from `test`.`t1` join `test`.`t3` where ((`test`.`t3`.`a` = `test`.`t1`.`b`) and (<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`)))))
 insert into t1 values (3,31);

mysql-test/r/subselect_no_semijoin.result

@@ -908,7 +908,7 @@ explain extended SELECT t1.a, t1.a in (select t2.a from t2,t3 where t3.a=t2.a) F
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	index	NULL	PRIMARY	4	NULL	4	100.00	Using index
 2	DEPENDENT SUBQUERY	t2	ref_or_null	a	a	5	func	2	100.00	Using index
-2	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+2	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,<expr_cache><`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`a`,<exists>(select 1 from `test`.`t2` join `test`.`t3` where ((`test`.`t3`.`a` = `test`.`t2`.`a`) and ((<cache>(`test`.`t1`.`a`) = `test`.`t2`.`a`) or isnull(`test`.`t2`.`a`))) having <is_not_null_test>(`test`.`t2`.`a`)))) AS `t1.a in (select t2.a from t2,t3 where t3.a=t2.a)` from `test`.`t1`
 drop table t1,t2,t3;
@@ -1319,7 +1319,7 @@ explain extended select * from t2 where t2.a in (select t1.a from t1,t3 where t1
 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	SUBQUERY	t3	index	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index
-2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where; Using join buffer
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	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 `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` = `materialized subselect`.`a`))))))
 drop table t1, t2, t3;
@@ -1362,7 +1362,7 @@ explain extended select * from t2 where t2.a in (select t1.a from t1,t3 where t1
 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	SUBQUERY	t3	index	a	a	5	NULL	3	100.00	Using index
-2	SUBQUERY	t1	index	NULL	a	10	NULL	10004	100.00	Using where; Using index; Using join buffer
+2	SUBQUERY	t1	index	NULL	a	10	NULL	10004	100.00	Using where; Using index; Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	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 `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` = `materialized subselect`.`a`))))))
 insert into t1 values (3,31);

mysql-test/r/subselect_sj2.result

@@ -34,7 +34,7 @@ explain select * from t2 where b in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	3	
 1	PRIMARY	t2	ref	b	b	5	test.t1.a	2	
-2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
 select * from t2 where b in (select a from t1);
 a	b
 1	1
@@ -52,7 +52,8 @@ insert into t3 select a,a, a,a,a from t0;
 explain select * from t3 where b in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t3	ALL	b	NULL	NULL	NULL	10	
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; FirstMatch(t3)
+1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	
 select * from t3 where b in (select a from t1);
 a	b	pk1	pk2	pk3
 1	1	1	1	1
@@ -76,7 +77,7 @@ explain select * from t3 where b in (select a from t0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
 1	PRIMARY	t3	ref	b	b	5	test.t0.a	1	
-2	SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	
+2	SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
 set @save_ecp= @@engine_condition_pushdown;
 set engine_condition_pushdown=0;
 select * from t3 where b in (select A.a+B.a from t0 A, t0 B where B.a<5);
@@ -130,7 +131,7 @@ a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z
 from t1 ot where a in (select a from t2 it);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	22	
-1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	32	Using where; Using join buffer
+1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	32	Using where; Using join buffer (flat, BNL join)
 2	SUBQUERY	it	ALL	NULL	NULL	NULL	NULL	22	
 select 
 a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z 
@@ -198,7 +199,7 @@ a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z
 from t1 ot where a in (select a from t2 it);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	22	
-1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	52	Using where; Using join buffer
+1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	52	Using where; Using join buffer (flat, BNL join)
 2	SUBQUERY	it	ALL	NULL	NULL	NULL	NULL	22	
 select 
 a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z 
@@ -272,8 +273,8 @@ from t0 where a in
 (select t2.a+t3.a from t1 left join (t2 join t3) on t2.a=t1.a and t3.a=t1.a);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	10	Start temporary
-1	PRIMARY	t1	index	NULL	a	5	NULL	10	Using index; Using join buffer
-1	PRIMARY	t2	ref	a	a	5	test.t1.a	1	Using index
+1	PRIMARY	t1	index	NULL	a	5	NULL	10	Using index; Using join buffer (flat, BNL join)
+1	PRIMARY	t2	ref	a	a	5	test.t1.a	1	Using where; Using index
 1	PRIMARY	t3	ref	a	a	5	test.t1.a	1	Using where; Using index; End temporary
 drop table t0, t1,t2,t3;
 CREATE TABLE t1 (
@@ -425,7 +426,7 @@ explain extended select * from t0
 where t0.a in ( select t1.a from t1,t2 where t2.a=t0.a and
 t1.b=t2.b);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	5	100.00	
+1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where
 1	PRIMARY	t1	ref	a	a	5	test.t0.a	1	100.00	Start temporary
 1	PRIMARY	t2	eq_ref	PRIMARY	PRIMARY	4	test.t0.a	1	100.00	Using where; End temporary
 Warnings:

mysql-test/r/subselect_sj2_jcl6.result

+set @save_optimizer_switch_jcl6=@@optimizer_switch;
+set @@optimizer_switch='semijoin_with_cache=on';
+set @@optimizer_switch='outer_join_with_cache=on';
 set join_cache_level=6;
 show variables like 'join_cache_level';
 Variable_name	Value
@@ -37,8 +40,8 @@ a	b
 explain select * from t2 where b in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	3	
-1	PRIMARY	t2	ref	b	b	5	test.t1.a	2	Using join buffer
-2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	PRIMARY	t2	ref	b	b	5	test.t1.a	2	Using join buffer (flat, BKA join)
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
 select * from t2 where b in (select a from t1);
 a	b
 1	1
@@ -56,7 +59,8 @@ insert into t3 select a,a, a,a,a from t0;
 explain select * from t3 where b in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t3	ALL	b	NULL	NULL	NULL	10	
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; FirstMatch(t3); Using join buffer
+1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	
 select * from t3 where b in (select a from t1);
 a	b	pk1	pk2	pk3
 1	1	1	1	1
@@ -79,8 +83,8 @@ from t0 A, t0 B where B.a <5;
 explain select * from t3 where b in (select a from t0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
-1	PRIMARY	t3	ref	b	b	5	test.t0.a	1	Using join buffer
-2	SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	
+1	PRIMARY	t3	ref	b	b	5	test.t0.a	1	Using join buffer (flat, BKA join)
+2	SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
 set @save_ecp= @@engine_condition_pushdown;
 set engine_condition_pushdown=0;
 select * from t3 where b in (select A.a+B.a from t0 A, t0 B where B.a<5);
@@ -134,7 +138,7 @@ a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z
 from t1 ot where a in (select a from t2 it);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	22	
-1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	32	Using where; Using join buffer
+1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	32	Using where; Using join buffer (flat, BNL join)
 2	SUBQUERY	it	ALL	NULL	NULL	NULL	NULL	22	
 select 
 a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z 
@@ -202,7 +206,7 @@ a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z
 from t1 ot where a in (select a from t2 it);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	22	
-1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	52	Using where; Using join buffer
+1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	52	Using where; Using join buffer (flat, BNL join)
 2	SUBQUERY	it	ALL	NULL	NULL	NULL	NULL	22	
 select 
 a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z 
@@ -276,8 +280,8 @@ from t0 where a in
 (select t2.a+t3.a from t1 left join (t2 join t3) on t2.a=t1.a and t3.a=t1.a);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	10	Start temporary
-1	PRIMARY	t1	index	NULL	a	5	NULL	10	Using index; Using join buffer
-1	PRIMARY	t2	ref	a	a	5	test.t1.a	1	Using index
+1	PRIMARY	t1	index	NULL	a	5	NULL	10	Using index; Using join buffer (flat, BNL join)
+1	PRIMARY	t2	ref	a	a	5	test.t1.a	1	Using where; Using index
 1	PRIMARY	t3	ref	a	a	5	test.t1.a	1	Using where; Using index; End temporary
 drop table t0, t1,t2,t3;
 CREATE TABLE t1 (
@@ -315,8 +319,8 @@ WHERE Language='English' AND Percentage > 10 AND
 t2.Population > 100000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	range	Population,Country	Population	4	NULL	1	Using index condition; Using MRR
-1	PRIMARY	t3	eq_ref	PRIMARY,Percentage	PRIMARY	33	test.t1.Country,const	1	Using index condition; Using where; Using join buffer
-1	PRIMARY	t2	eq_ref	PRIMARY,Population	PRIMARY	3	test.t3.Country	1	Using index condition(BKA); Using where; Using join buffer
+1	PRIMARY	t3	eq_ref	PRIMARY,Percentage	PRIMARY	33	test.t1.Country,const	1	Using index condition; Using where; Using join buffer (flat, BKA join)
+1	PRIMARY	t2	eq_ref	PRIMARY,Population	PRIMARY	3	test.t3.Country	1	Using index condition(BKA); Using where; Using join buffer (incremental, BKA join)
 DROP TABLE t1,t2,t3;
 CREATE TABLE t1 (
 Code char(3) NOT NULL DEFAULT '',
@@ -429,9 +433,9 @@ explain extended select * from t0
 where t0.a in ( select t1.a from t1,t2 where t2.a=t0.a and
 t1.b=t2.b);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	5	100.00	Start temporary
-1	PRIMARY	t1	ref	a	a	5	test.t0.a	1	100.00	Using join buffer
-1	PRIMARY	t2	eq_ref	PRIMARY	PRIMARY	4	test.t0.a	1	100.00	Using where; End temporary; Using join buffer
+1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where; Start temporary
+1	PRIMARY	t1	ref	a	a	5	test.t0.a	1	100.00	Using join buffer (flat, BKA join)
+1	PRIMARY	t2	eq_ref	PRIMARY	PRIMARY	4	test.t0.a	1	100.00	Using where; End temporary; Using join buffer (incremental, BKA join)
 Warnings:
 Note	1276	Field or reference 'test.t0.a' of SELECT #2 was resolved in SELECT #1
 Note	1003	select `test`.`t0`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) join `test`.`t0` where ((`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t1`.`a` = `test`.`t0`.`a`) and (`test`.`t2`.`a` = `test`.`t0`.`a`))
@@ -584,7 +588,7 @@ explain
 select * from t1 left join t2 on (t2.a= t1.a and t2.a in (select pk from t3));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 2	DEPENDENT SUBQUERY	t3	unique_subquery	PRIMARY	PRIMARY	4	func	1	Using index
 drop table t0, t1, t2, t3;
 create table t1 (a int);
@@ -725,11 +729,12 @@ c2 in (select 1 from t3, t2) and
 c1 in (select convert(c6,char(1)) from t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	1	Using where
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	1	Using where; Using join buffer
-1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	2	FirstMatch(t2); Using join buffer
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (flat, BNL join)
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	1	Using where; Using join buffer (incremental, BNL join)
+1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	2	FirstMatch(t2); Using join buffer (incremental, BNL join)
 drop table t2, t3;
 set join_cache_level=default;
 show variables like 'join_cache_level';
 Variable_name	Value
 join_cache_level	1
+set @@optimizer_switch=@save_optimizer_switch_jcl6;

mysql-test/r/table_elim.result

@@ -26,17 +26,17 @@ a
 explain select * from t1 left join t2 on t2.a=t1.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where
 # This will not be eliminated as t2.b is in in order list:
 explain select t1.a from t1 left join t2 on t2.a=t1.a order by t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using temporary; Using filesort
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where
 # This will not be eliminated as t2.b is in group list:
 explain select t1.a from t1 left join t2 on t2.a=t1.a group by t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using temporary; Using filesort
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where
 # This will not be eliminated as t2.b is in the WHERE
 explain select t1.a from t1 left join t2 on t2.a=t1.a where t2.b < 3 or t2.b is null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -75,7 +75,7 @@ This must not use elimination:
 explain select count(1) from t1 left join t2 on t2.a=t1.a group by t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using temporary; Using filesort
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using index
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where; Using index
 drop table t0, t1, t2, t3;
 create table t0 ( id integer, primary key (id));
 create table t1 (
@@ -217,7 +217,7 @@ explain
 select t1.*, t2.* from t1 left join (t2 left join t3 on t3.pk=t2.col) on t2.pk=t1.col;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.col	1	
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.col	1	Using where
 explain select t1.* 
 from 
 t1 left join ( t2 left join t3 on t3.pk=t2.col or t3.pk=t2.col) 
@@ -232,7 +232,7 @@ t1 left join
 on t2.pk=t1.col or t2.pk=t1.col;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.col	1	
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.col	1	Using where
 drop table t1, t2, t3;
 # 
 # Check things that look like functional dependencies but really are not

mysql-test/r/table_elim_debug.result

@@ -10,7 +10,7 @@ set optimizer_switch='table_elimination=off';
 explain select t1.a from t1 left join t2 on t2.a=t1.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using index
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where; Using index
 set optimizer_switch='table_elimination=on';
 explain select t1.a from t1 left join t2 on t2.a=t1.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

mysql-test/r/type_datetime.result

@@ -537,8 +537,8 @@ explain extended
 select * from t1
 where id in (select id from t1 as x1 where (t1.cur_date is null));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
-1	PRIMARY	x1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; FirstMatch(t1)
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Start temporary
+1	PRIMARY	x1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; End temporary; Using join buffer (flat, BNL join)
 Warnings:
 Note	1276	Field or reference 'test.t1.cur_date' of SELECT #2 was resolved in SELECT #1
 Note	1003	select `test`.`t1`.`id` AS `id`,`test`.`t1`.`cur_date` AS `cur_date` from `test`.`t1` semi join (`test`.`t1` `x1`) where ((`test`.`x1`.`id` = `test`.`t1`.`id`) and (`test`.`t1`.`cur_date` = 0))
@@ -549,8 +549,8 @@ explain extended
 select * from t2
 where id in (select id from t2 as x1 where (t2.cur_date is null));
 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	x1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; FirstMatch(t2)
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Start temporary
+1	PRIMARY	x1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; End temporary; Using join buffer (flat, BNL join)
 Warnings:
 Note	1276	Field or reference 'test.t2.cur_date' of SELECT #2 was resolved in SELECT #1
 Note	1003	select `test`.`t2`.`id` AS `id`,`test`.`t2`.`cur_date` AS `cur_date` from `test`.`t2` semi join (`test`.`t2` `x1`) where ((`test`.`x1`.`id` = `test`.`t2`.`id`) and (`test`.`t2`.`cur_date` = 0))

mysql-test/r/union.result

@@ -542,7 +542,7 @@ 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	index	PRIMARY	PRIMARY	4	NULL	4	Using where; Using index; Using join buffer
+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	
 explain (select * from t1 where a=1) union (select * from t1 where b=1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

mysql-test/r/view.result

@@ -2341,16 +2341,16 @@ CREATE VIEW v1 AS SELECT t1.* FROM t1,t2 WHERE t1.a=t2.a AND t1.b=t2.b;
 CREATE VIEW v2 AS SELECT t3.* FROM t1,t3 WHERE t1.a=t3.a;
 EXPLAIN SELECT t1.* FROM t1 JOIN t2 WHERE t1.a=t2.a AND t1.b=t2.b AND t1.a=1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ref	a	a	5	const	1	Using index
+1	SIMPLE	t1	ref	a	a	5	const	1	Using where; Using index
 1	SIMPLE	t2	ref	a	a	10	const,test.t1.b	1	Using index
 EXPLAIN SELECT * FROM v1 WHERE a=1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ref	a	a	5	const	1	Using index
+1	SIMPLE	t1	ref	a	a	5	const	1	Using where; Using index
 1	SIMPLE	t2	ref	a	a	10	const,test.t1.b	1	Using index
 EXPLAIN SELECT * FROM v2 WHERE a=1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	a	a	5	const	1	Using index
-1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer (flat, BNL join)
 DROP VIEW v1,v2;
 DROP TABLE t1,t2,t3;
 create table t1 (f1 int);

mysql-test/suite/innodb/r/innodb_gis.result

@@ -403,7 +403,7 @@ Intersects(g1.g, g2.g) as i, Crosses(g1.g, g2.g) as r
 FROM gis_geometrycollection g1, gis_geometrycollection g2 ORDER BY first, second;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
-1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
+1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`g1`.`fid` AS `first`,`test`.`g2`.`fid` AS `second`,within(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `w`,contains(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `c`,overlaps(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `o`,equals(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `e`,disjoint(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `d`,touches(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `t`,intersects(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `i`,crosses(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `r` from `test`.`gis_geometrycollection` `g1` join `test`.`gis_geometrycollection` `g2` order by `test`.`g1`.`fid`,`test`.`g2`.`fid`
 DROP TABLE gis_point, gis_line, gis_polygon, gis_multi_point, gis_multi_line, gis_multi_polygon, gis_geometrycollection, gis_geometry;

mysql-test/suite/innodb/r/innodb_mysql.result

@@ -187,7 +187,7 @@ min(7)
 explain select min(7) from t2i join t1i;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	
-1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
+1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (flat, BNL join)
 select min(7) from t2i join t1i;
 min(7)
 NULL
@@ -203,7 +203,7 @@ max(7)
 explain select max(7) from t2i join t1i;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	
-1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
+1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (flat, BNL join)
 select max(7) from t2i join t1i;
 max(7)
 NULL
@@ -2631,6 +2631,61 @@ t2	CREATE TABLE `t2` (
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1
 drop table t2, t1;
 #
+# Bug #663818: wrong result when BNLH is used 
+#
+CREATE TABLE t1(pk int NOT NULL PRIMARY KEY) ENGINE=InnoDB;
+INSERT INTO t1 VALUES 
+(1), (2), (11), (12), (13), (14),
+(15), (16), (17), (18), (19);
+CREATE TABLE t2(pk int NOT NULL PRIMARY KEY) ENGINE=InnoDB;
+INSERT INTO t2 VALUES 
+(1), (10), (11), (12), (13), (14),
+(15), (16), (17), (18), (19), (20), (21);
+SET SESSION join_buffer_size=10000;
+SET SESSION join_cache_level=3;
+EXPLAIN
+SELECT t1.pk FROM t1,t2 
+WHERE t1.pk = t2.pk AND t2.pk <> 8;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	PRIMARY	PRIMARY	4	NULL	11	Using where; Using index
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.pk	1	Using index; Using join buffer (flat, BNLH join)
+SELECT t1.pk FROM t1,t2 
+WHERE t1.pk = t2.pk AND t2.pk <> 8;
+pk
+1
+11
+12
+13
+14
+15
+16
+17
+18
+19
+SET SESSION join_cache_level=1;
+EXPLAIN
+SELECT t1.pk FROM t1,t2 
+WHERE t1.pk = t2.pk AND t2.pk <> 8;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	PRIMARY	PRIMARY	4	NULL	11	Using where; Using index
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.pk	1	Using index
+SELECT t1.pk FROM t1,t2 
+WHERE t1.pk = t2.pk AND t2.pk <> 8;
+pk
+1
+11
+12
+13
+14
+15
+16
+17
+18
+19
+DROP TABLE t1,t2;
+SET SESSION join_cache_level=DEFAULT;
+SET SESSION join_buffer_size=DEFAULT;
+#
 # Bug#668644: HAVING + ORDER BY
 #
 CREATE TABLE t1 (

mysql-test/suite/innodb/t/innodb_mysql.test

@@ -859,6 +859,40 @@ create table t2 (fk int, key x (fk),
 show create table t2;
 drop table t2, t1;
 
+--echo #
+--echo # Bug #663818: wrong result when BNLH is used 
+--echo #
+
+CREATE TABLE t1(pk int NOT NULL PRIMARY KEY) ENGINE=InnoDB;
+INSERT INTO t1 VALUES 
+  (1), (2), (11), (12), (13), (14),
+  (15), (16), (17), (18), (19);
+CREATE TABLE t2(pk int NOT NULL PRIMARY KEY) ENGINE=InnoDB;
+INSERT INTO t2 VALUES 
+  (1), (10), (11), (12), (13), (14),
+  (15), (16), (17), (18), (19), (20), (21);
+
+SET SESSION join_buffer_size=10000;
+
+SET SESSION join_cache_level=3;
+EXPLAIN
+SELECT t1.pk FROM t1,t2 
+  WHERE t1.pk = t2.pk AND t2.pk <> 8;
+SELECT t1.pk FROM t1,t2 
+  WHERE t1.pk = t2.pk AND t2.pk <> 8;
+
+SET SESSION join_cache_level=1;
+EXPLAIN
+SELECT t1.pk FROM t1,t2 
+  WHERE t1.pk = t2.pk AND t2.pk <> 8;
+SELECT t1.pk FROM t1,t2 
+  WHERE t1.pk = t2.pk AND t2.pk <> 8;
+
+DROP TABLE t1,t2;
+
+SET SESSION join_cache_level=DEFAULT;
+SET SESSION join_buffer_size=DEFAULT;
+
 --echo #
 --echo # Bug#668644: HAVING + ORDER BY
 --echo #

mysql-test/suite/innodb_plugin/r/innodb_gis.result

@@ -403,7 +403,7 @@ Intersects(g1.g, g2.g) as i, Crosses(g1.g, g2.g) as r
 FROM gis_geometrycollection g1, gis_geometrycollection g2 ORDER BY first, second;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	g1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
-1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
+1	SIMPLE	g2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`g1`.`fid` AS `first`,`test`.`g2`.`fid` AS `second`,within(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `w`,contains(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `c`,overlaps(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `o`,equals(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `e`,disjoint(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `d`,touches(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `t`,intersects(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `i`,crosses(`test`.`g1`.`g`,`test`.`g2`.`g`) AS `r` from `test`.`gis_geometrycollection` `g1` join `test`.`gis_geometrycollection` `g2` order by `test`.`g1`.`fid`,`test`.`g2`.`fid`
 DROP TABLE gis_point, gis_line, gis_polygon, gis_multi_point, gis_multi_line, gis_multi_polygon, gis_geometrycollection, gis_geometry;

mysql-test/suite/innodb_plugin/r/innodb_mysql.result

@@ -187,7 +187,7 @@ min(7)
 explain select min(7) from t2i join t1i;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	
-1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
+1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (flat, BNL join)
 select min(7) from t2i join t1i;
 min(7)
 NULL
@@ -203,7 +203,7 @@ max(7)
 explain select max(7) from t2i join t1i;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2i	ALL	NULL	NULL	NULL	NULL	1	
-1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
+1	SIMPLE	t1i	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (flat, BNL join)
 select max(7) from t2i join t1i;
 max(7)
 NULL

mysql-test/suite/maria/r/maria.result

@@ -381,7 +381,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	a	a	4	test.t2.a	3	
 explain select * from t1,t2 where t1.b=t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	b	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	b	NULL	NULL	NULL	2	Using where
 1	SIMPLE	t1	ref	b	b	5	test.t2.b	1	
 explain select * from t1,t2 force index(c) where t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

mysql-test/suite/pbxt/r/derived.result

@@ -58,7 +58,7 @@ a	b	a	b
 explain select * from t1 as x1, (select * from t1) as x2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	x1	ALL	NULL	NULL	NULL	NULL	4	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	Using join buffer
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	Using join buffer (flat, BNL join)
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	
 drop table if exists  t2,t3;
 select * from (select 1) as a;
@@ -115,7 +115,7 @@ explain select * from (select t1.*, t2.a as t2a from t1,t2 where t1.a=t2.a) t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	
 2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	1	
-2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	Using where; Using join buffer
+2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	Using where; Using join buffer (flat, BNL join)
 drop table t1, t2;
 create table t1(a int not null, t char(8), index(a));
 SELECT * FROM (SELECT * FROM t1) as b ORDER BY a  ASC LIMIT 0,20;
@@ -143,7 +143,7 @@ a	t
 explain select count(*) from t1 as tt1, (select * from t1) as tt2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	tt1	index	NULL	a	4	NULL	10000	Using index
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	10000	Using join buffer
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	10000	Using join buffer (flat, BNL join)
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	10000	
 drop table t1;
 SELECT * FROM (SELECT (SELECT * FROM (SELECT 1 as a) as a )) as b;
@@ -190,13 +190,13 @@ pla_id	test
 explain SELECT STRAIGHT_JOIN d.pla_id, m2.mat_id FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	m2	ALL	NULL	NULL	NULL	NULL	9	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
 2	DERIVED	mp	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 2	DERIVED	m1	eq_ref	PRIMARY	PRIMARY	3	test.mp.mat_id	1	
 explain SELECT STRAIGHT_JOIN d.pla_id, m2.test FROM t1 m2  INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	m2	ALL	NULL	NULL	NULL	NULL	9	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
 2	DERIVED	mp	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 2	DERIVED	m1	eq_ref	PRIMARY	PRIMARY	3	test.mp.mat_id	1	
 drop table t1,t2;
@@ -250,7 +250,7 @@ a	a
 explain select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	<derived4>	ALL	NULL	NULL	NULL	NULL	2	Using join buffer
+1	PRIMARY	<derived4>	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
 4	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	
 5	UNION	t1	ALL	NULL	NULL	NULL	NULL	2	
 NULL	UNION RESULT	<union4,5>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -317,7 +317,7 @@ explain SELECT s.name, AVG(s.val) AS median FROM (SELECT x.name, x.val FROM t1 x
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	3	Using temporary; Using filesort
 2	DERIVED	x	ALL	NULL	NULL	NULL	NULL	17	Using temporary; Using filesort
-2	DERIVED	y	ALL	NULL	NULL	NULL	NULL	17	Using where; Using join buffer
+2	DERIVED	y	ALL	NULL	NULL	NULL	NULL	17	Using where; Using join buffer (flat, BNL join)
 drop table t1;
 create table t2 (a int, b int, primary key (a));
 insert into t2 values (1,7),(2,7);

mysql-test/suite/pbxt/r/distinct.result

@@ -173,7 +173,7 @@ 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	t1	ALL	PRIMARY	NULL	NULL	NULL	4	Using temporary
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	4	Using where; Using temporary
 1	SIMPLE	t2	ref	a	a	4	test.t1.a	1	Using index
 1	SIMPLE	t3	ref	a	a	5	test.t1.b	1	Using index
 SELECT distinct t3.a FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a;
@@ -300,11 +300,11 @@ WHERE
 AND ((t1.id=j_lj_t3.id AND t3_lj.id IS NULL) OR (t1.id=t3.id AND t3.idx=2));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	index	id	id	4	NULL	2	Using index; Using temporary
-1	SIMPLE	t2	index	id	id	8	NULL	1	Using index; Distinct; Using join buffer
-1	SIMPLE	t3	index	id	id	8	NULL	1	Using index; Distinct; Using join buffer
-1	SIMPLE	j_lj_t2	index	id	id	4	NULL	2	Using where; Using index; Distinct; Using join buffer
+1	SIMPLE	t2	index	id	id	8	NULL	1	Using index; Distinct; Using join buffer (flat, BNL join)
+1	SIMPLE	t3	index	id	id	8	NULL	1	Using index; Distinct; Using join buffer (flat, BNL join)
+1	SIMPLE	j_lj_t2	index	id	id	4	NULL	2	Using where; Using index; Distinct; Using join buffer (flat, BNL join)
 1	SIMPLE	t2_lj	ref	id	id	4	test.j_lj_t2.id	1	Using where; Using index; Distinct
-1	SIMPLE	j_lj_t3	index	id	id	4	NULL	2	Using where; Using index; Distinct; Using join buffer
+1	SIMPLE	j_lj_t3	index	id	id	4	NULL	2	Using where; Using index; Distinct; Using join buffer (flat, BNL join)
 1	SIMPLE	t3_lj	ref	id	id	4	test.j_lj_t3.id	1	Using where; Using index; Distinct
 SELECT DISTINCT
 t1.id
@@ -515,7 +515,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1_1	ALL	NULL	NULL	NULL	NULL	3	Using temporary
-1	SIMPLE	t1_2	index	NULL	PRIMARY	4	NULL	3	Using index; Distinct; Using join buffer
+1	SIMPLE	t1_2	index	NULL	PRIMARY	4	NULL	3	Using index; Distinct; Using join buffer (flat, BNL join)
 EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2
 WHERE t1_1.a = t1_2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

mysql-test/suite/pbxt/r/func_group.result

@@ -614,7 +614,7 @@ explain
 select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 > 'CA';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	range	k1	k1	7	NULL	1	Using where; Using index
-1	SIMPLE	t2	range	k1	k1	3	NULL	1	Using where; Using index; Using join buffer
+1	SIMPLE	t2	range	k1	k1	3	NULL	1	Using where; Using index; Using join buffer (flat, BNL join)
 explain
 select min(a4 - 0.01) from t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -651,7 +651,7 @@ explain
 select concat(min(t1.a1),min(t2.a4)) from t1, t2 where t2.a4 <> 'AME';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	index	k2	k2	4	NULL	7	Using where; Using index
-1	SIMPLE	t1	index	NULL	PRIMARY	3	NULL	15	Using index; Using join buffer
+1	SIMPLE	t1	index	NULL	PRIMARY	3	NULL	15	Using index; Using join buffer (flat, BNL join)
 drop table t1, t2;
 create table t1 (a char(10));
 insert into t1 values ('a'),('b'),('c');

mysql-test/suite/pbxt/r/group_by.result

@@ -537,11 +537,11 @@ a	b
 explain select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary; Using filesort
-1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
+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	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary
-1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
+1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer (flat, BNL join)
 drop table t1,t2;
 create table t1 (a int, b int);
 insert into t1 values (1, 4),(10, 40),(1, 4),(10, 43),(1, 4),(10, 41),(1, 4),(10, 43),(1, 4);
@@ -856,7 +856,7 @@ explain
 SELECT straight_join sql_no_cache v1.a, v1.b, v1.real_b from t2, v1
 where t2.b=v1.a GROUP BY t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	index	b	b	2	NULL	10	Using index
+1	SIMPLE	t2	index	b	b	2	NULL	10	Using where; Using index
 1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	1	test.t2.b	1	
 SELECT straight_join sql_no_cache v1.a, v1.b, v1.real_b from t2, v1
 where t2.b=v1.a GROUP BY t2.b;

mysql-test/suite/pbxt/r/group_min_max.result

@@ -2268,7 +2268,7 @@ ON t1_outer1.a = (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2)
 AND t1_outer1.b = t1_outer2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1_outer1	ref	a	a	5	const	1	Using where; Using index
-1	PRIMARY	t1_outer2	index	NULL	a	10	NULL	15	Using where; Using index; Using join buffer
+1	PRIMARY	t1_outer2	index	NULL	a	10	NULL	15	Using where; Using index; Using join buffer (flat, BNL join)
 2	SUBQUERY	t1	index	NULL	a	10	NULL	15	Using index
 EXPLAIN SELECT (SELECT (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) x
 FROM t1 AS t1_outer) x2 FROM t1 AS t1_outer2;

mysql-test/suite/pbxt/r/join.result

@@ -794,8 +794,8 @@ Z
 vv: Following query must use ALL(t1), eq_ref(A), eq_ref(B): vv
 explain select * from t1, t2 A, t2 B where A.a = t1.a and B.a=A.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	10	
-1	SIMPLE	A	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	10	Using where
+1	SIMPLE	A	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where
 1	SIMPLE	B	eq_ref	PRIMARY	PRIMARY	4	test.A.b	1	
 show status like '%cost%';
 Variable_name	Value

mysql-test/suite/pbxt/r/null_key.result

@@ -178,12 +178,12 @@ create table t2 (a int);
 insert into t2 values (7),(8);
 explain select * from t2 straight_join t1 where t1.a=t2.a and b is null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 1	SIMPLE	t1	ref	a,b	a	10	test.t2.a,const	2	Using where; Using index
 drop index b on t1;
 explain select * from t2,t1 where t1.a=t2.a and b is null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 1	SIMPLE	t1	ref	a	a	10	test.t2.a,const	2	Using where; Using index
 select * from t2,t1 where t1.a=t2.a and b is null;
 a	a	b
@@ -191,7 +191,7 @@ a	a	b
 8	8	NULL
 explain select * from t2,t1 where t1.a=t2.a and (b= 7 or b is null);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 1	SIMPLE	t1	ref_or_null	a	a	10	test.t2.a,const	4	Using index
 select * from t2,t1 where t1.a=t2.a and (b= 7 or b is null);
 a	a	b
@@ -407,8 +407,8 @@ EXPLAIN SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
 LEFT JOIN t3 ON t2.b=t3.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	
-1	SIMPLE	t2	ref	idx	idx	5	test.t1.a	1	
-1	SIMPLE	t3	ref	idx	idx	5	test.t2.b	1	Using index
+1	SIMPLE	t2	ref	idx	idx	5	test.t1.a	1	Using where
+1	SIMPLE	t3	ref	idx	idx	5	test.t2.b	1	Using where; Using index
 FLUSH STATUS ;
 SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
 LEFT JOIN t3 ON t2.b=t3.b;

mysql-test/suite/pbxt/r/range.result

@@ -222,27 +222,27 @@ update t1 set y=x;
 explain select * from t1, t1 t2 where t1.y = 8 and t2.x between 7 and t1.y+0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	1	Using where; Using join buffer
+1	SIMPLE	t2	range	x	x	5	NULL	1	Using where; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 8 and t2.x >= 7 and t2.x <= t1.y+0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	1	Using where; Using join buffer
+1	SIMPLE	t2	range	x	x	5	NULL	1	Using where; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x between t1.y-1 and t1.y+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	1	Using where; Using join buffer
+1	SIMPLE	t2	range	x	x	5	NULL	1	Using where; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x >= t1.y-1 and t2.x <= t1.y+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	1	Using where; Using join buffer
+1	SIMPLE	t2	range	x	x	5	NULL	1	Using where; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x between 0 and t1.y;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	1	Using where; Using join buffer
+1	SIMPLE	t2	range	x	x	5	NULL	1	Using where; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x >= 0 and t2.x <= t1.y;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	1	Using where; Using join buffer
+1	SIMPLE	t2	range	x	x	5	NULL	1	Using where; Using join buffer (flat, BNL join)
 explain select count(*) from t1 where x in (1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	x	x	5	const	1	Using index

mysql-test/suite/pbxt/r/select_safe.result

@@ -71,12 +71,12 @@ test.t1	analyze	status	OK
 insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a");
 explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	b	NULL	NULL	NULL	21	
+1	SIMPLE	t1	ALL	b	NULL	NULL	NULL	21	Using where
 1	SIMPLE	t2	ref	b	b	21	test.t1.b	1	
 set MAX_SEEKS_FOR_KEY=1;
 explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	b	NULL	NULL	NULL	21	
+1	SIMPLE	t1	ALL	b	NULL	NULL	NULL	21	Using where
 1	SIMPLE	t2	ref	b	b	21	test.t1.b	1	
 SET MAX_SEEKS_FOR_KEY=DEFAULT;
 drop table t1, t2;

mysql-test/suite/pbxt/r/union.result

@@ -500,7 +500,7 @@ 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	index	PRIMARY	PRIMARY	4	NULL	4	Using where; Using index; Using join buffer
+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	
 explain (select * from t1 where a=1) union (select * from t1 where b=1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

mysql-test/suite/vcol/r/vcol_misc.result

@@ -143,8 +143,8 @@ set join_cache_level=6;
 explain
 select * from t1,t2 where t1.b=t2.c and d <= 100;
 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	idx	idx	5	test.t1.b	2	Using where; Using join buffer
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t2	ref	idx	idx	5	test.t1.b	2	Using where; Using join buffer (flat, BKA join)
 select * from t1,t2 where t1.b=t2.c and d <= 100;
 a	b	c	d	v
 4	20	20	100	101