drop table if exists t0,t1,t2,t3;
set @innodb_mrr_cpk_tmp=@@optimizer_switch;
set optimizer_switch='mrr=on,mrr_sort_keys=on,index_condition_pushdown=on';
set @save_join_cache_level=@@join_cache_level;
set join_cache_level=6;
set @save_storage_engine=@@storage_engine;
set storage_engine=innodb;
create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1(a char(8), b char(8), filler char(100), primary key(a));
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` char(8) NOT NULL,
  `b` char(8) DEFAULT NULL,
  `filler` char(100) DEFAULT NULL,
  PRIMARY KEY (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
insert into t1 select 
concat('a-', 1000 + A.a + B.a*10 + C.a*100, '=A'),
concat('b-', 1000 + A.a + B.a*10 + C.a*100, '=B'),
'filler'
from t0 A, t0 B, t0 C;
create table t2 (a char(8));
insert into t2 values ('a-1010=A'), ('a-1030=A'), ('a-1020=A');
This should use join buffer:
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	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	8	test.t2.a	1	Using join buffer (flat, BKA join); Key-ordered scan
This output must be sorted by value of t1.a:
select * from t1, t2 where t1.a=t2.a;
a	b	filler	a
a-1010=A	b-1010=B	filler	a-1010=A
a-1020=A	b-1020=B	filler	a-1020=A
a-1030=A	b-1030=B	filler	a-1030=A
drop table t1, t2;
create table t1(
a char(8) character set utf8, b int, filler char(100), 
primary key(a,b)
);
insert into t1 select 
concat('a-', 1000 + A.a + B.a*10 + C.a*100, '=A'),
1000 + A.a + B.a*10 + C.a*100,
'filler'
from t0 A, t0 B, t0 C;
create table t2 (a char(8) character set utf8, b int);
insert into t2 values ('a-1010=A', 1010), ('a-1030=A', 1030), ('a-1020=A', 1020);
explain select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	28	test.t2.a,test.t2.b	1	Using join buffer (flat, BKA join); Key-ordered scan
select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
a	b	filler	a	b
a-1010=A	1010	filler	a-1010=A	1010
a-1020=A	1020	filler	a-1020=A	1020
a-1030=A	1030	filler	a-1030=A	1030
insert into t2 values ('a-1030=A', 1030), ('a-1020=A', 1020);
explain select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	5	Using where
1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	28	test.t2.a,test.t2.b	1	Using join buffer (flat, BKA join); Key-ordered scan
select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
a	b	filler	a	b
a-1010=A	1010	filler	a-1010=A	1010
a-1020=A	1020	filler	a-1020=A	1020
a-1020=A	1020	filler	a-1020=A	1020
a-1030=A	1030	filler	a-1030=A	1030
a-1030=A	1030	filler	a-1030=A	1030
drop table t1, t2;
create table t1(
a varchar(8) character set utf8, b int, filler char(100), 
primary key(a,b)
);
insert into t1 select 
concat('a-', 1000 + A.a + B.a*10 + C.a*100, '=A'),
1000 + A.a + B.a*10 + C.a*100,
'filler'
from t0 A, t0 B, t0 C;
create table t2 (a char(8) character set utf8, b int);
insert into t2 values ('a-1010=A', 1010), ('a-1030=A', 1030), ('a-1020=A', 1020);
explain select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	30	test.t2.a,test.t2.b	1	Using where; Using join buffer (flat, BKA join); Key-ordered scan
select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
a	b	filler	a	b
a-1010=A	1010	filler	a-1010=A	1010
a-1020=A	1020	filler	a-1020=A	1020
a-1030=A	1030	filler	a-1030=A	1030
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	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t1	ref	PRIMARY	PRIMARY	26	test.t2.a	1	Using where; Using join buffer (flat, BKA join); Key-ordered scan
select * from t1, t2 where t1.a=t2.a;
a	b	filler	a	b
a-1010=A	1010	filler	a-1010=A	1010
a-1020=A	1020	filler	a-1020=A	1020
a-1030=A	1030	filler	a-1030=A	1030
drop table t1, t2;
create table t1 (a int, b int, c int, filler char(100), primary key(a,b,c));
insert into t1 select A.a, B.a, C.a, 'filler' from t0 A, t0 B, t0 C;
insert into t1 values (11, 11, 11,   'filler');
insert into t1 values (11, 11, 12,   'filler');
insert into t1 values (11, 11, 13,   'filler');
insert into t1 values (11, 22, 1234, 'filler');
insert into t1 values (11, 33, 124,  'filler');
insert into t1 values (11, 33, 125,  'filler');
create table t2 (a int, b int);
insert into t2 values (11,33), (11,22), (11,11);
explain select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t1	ref	PRIMARY	PRIMARY	8	test.t2.a,test.t2.b	1	Using join buffer (flat, BKA join); Key-ordered scan
select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
a	b	c	filler	a	b
11	11	11	filler	11	11
11	11	12	filler	11	11
11	11	13	filler	11	11
11	22	1234	filler	11	22
11	33	124	filler	11	33
11	33	125	filler	11	33
set join_cache_level=0;
select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
a	b	c	filler	a	b
11	33	124	filler	11	33
11	33	125	filler	11	33
11	22	1234	filler	11	22
11	11	11	filler	11	11
11	11	12	filler	11	11
11	11	13	filler	11	11
set join_cache_level=6;
explain select * from t1, t2 where t1.a=t2.a and t2.b + t1.b > 100;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t1	ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using where; Using join buffer (flat, BKA join); Key-ordered scan
select * from t1, t2 where t1.a=t2.a and t2.b + t1.b > 100;
a	b	c	filler	a	b
set optimizer_switch='index_condition_pushdown=off';
explain select * from t1, t2 where t1.a=t2.a and t2.b + t1.b > 100;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t1	ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using where; Using join buffer (flat, BKA join); Key-ordered scan
select * from t1, t2 where t1.a=t2.a and t2.b + t1.b > 100;
a	b	c	filler	a	b
set optimizer_switch='index_condition_pushdown=on';
drop table t1,t2;
drop table t0;
#
# MDEV-6878: Use of uninitialized saved_primary_key in Mrr_ordered_index_reader::resume_read()
#
create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (
pk varchar(32) character set utf8 primary key,
kp1 char(32) not null,
col1 varchar(32),
key (kp1)
) engine=innodb;
insert into t1
select
concat('pk-', 1000 +A.a),
concat('kp1-', 1000 +A.a),
concat('val-', 1000 +A.a)
from test.t0 A ;
create table t2 as select kp1 as a from t1;
set join_cache_level=8;
set optimizer_switch='mrr=on,mrr_sort_keys=on';
explain
select * from t2 straight_join t1 force index(kp1) where t1.kp1=t2.a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10	
1	SIMPLE	t1	ref	kp1	kp1	32	test.t2.a	1	Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
select * from t2 straight_join t1 force index(kp1) where t1.kp1=t2.a;
a	pk	kp1	col1
kp1-1000	pk-1000	kp1-1000	val-1000
kp1-1001	pk-1001	kp1-1001	val-1001
kp1-1002	pk-1002	kp1-1002	val-1002
kp1-1003	pk-1003	kp1-1003	val-1003
kp1-1004	pk-1004	kp1-1004	val-1004
kp1-1005	pk-1005	kp1-1005	val-1005
kp1-1006	pk-1006	kp1-1006	val-1006
kp1-1007	pk-1007	kp1-1007	val-1007
kp1-1008	pk-1008	kp1-1008	val-1008
kp1-1009	pk-1009	kp1-1009	val-1009
drop table t0,t1,t2;
#
#
# MDEV-3817: Wrong result with index_merge+index_merge_intersection, InnoDB table, join, AND and OR conditions
#
set @tmp_mdev3817=@@optimizer_switch;
SET optimizer_switch='index_merge=on,index_merge_intersection=on';
CREATE TABLE t1 (
a INT PRIMARY KEY,
b INT,
c VARCHAR(1024) CHARACTER SET utf8,
d INT,
KEY (b)
) ENGINE=InnoDB;
INSERT INTO t1 VALUES 
(1, 9, 'one', 11), (2, 6, 'two', 12), (3, 2, 'three', 13), (4, 5, 'four', 14);
CREATE TABLE t2 (e INT, g INT) ENGINE=InnoDB;
INSERT INTO t2 VALUES (1,9), (2,6) ;
SELECT * FROM t1, t2 WHERE g = b AND ( a < 7 OR a > e );
a	b	c	d	e	g
1	9	one	11	1	9
2	6	two	12	2	6
DROP TABLE t1, t2;
set optimizer_switch=@tmp_mdev3817;
#
# MDEV-5037: Server crash on a JOIN on a derived table with join_cache_level > 2
#
create table  t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
CREATE TABLE t1 (
id char(8) CHARACTER SET utf8 NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
CREATE TABLE t2 (
id char(8) CHARACTER SET utf8 DEFAULT NULL,
url text CHARACTER SET utf8
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
insert into t1 select '03b2ca8c' from t0 A, t0 B limit 80;
insert into t2 select '03b2ca8c','' from t0 A, t0 B, t0 C;
set @tmp_mdev5037=@@join_cache_level;
set join_cache_level=3;
explain SELECT 1 FROM (SELECT url, id FROM t2 LIMIT 1 OFFSET 20) derived RIGHT JOIN t1 ON t1.id = derived.id;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	
1	PRIMARY	<derived2>	ref	key0	key0	25	test.t1.id	#	
2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	#	
set join_cache_level= @tmp_mdev5037;
drop table t0,t1,t2;
#
# This must be at the end:
#
set @@join_cache_level= @save_join_cache_level;
set storage_engine=@save_storage_engine;
set optimizer_switch=@innodb_mrr_cpk_tmp;
