#
# WL#6986 : Make switching of index due to order by limit cost based
#
# Testcase for Bug#16522053
CREATE TABLE t1 (
pk INT PRIMARY KEY AUTO_INCREMENT,
i INT,
j INT,
INDEX (i),
INDEX (j)
);
INSERT INTO t1 (i,j) VALUES (1,1);
set @d=1;
INSERT INTO t1 (i,j) SELECT i+@d, j+@d from t1;
set @d=@d*2;
INSERT INTO t1 (i,j) SELECT i+@d, j+@d from t1;
set @d=@d*2;
INSERT INTO t1 (i,j) SELECT i+@d, j+@d from t1;
set @d=@d*2;
INSERT INTO t1 (i,j) SELECT i+@d, j+@d from t1;
set @d=@d*2;
INSERT INTO t1 (i,j) SELECT i+@d, j+@d from t1;
set @d=@d*2;
INSERT INTO t1 (i,j) SELECT i+@d, j+@d from t1;
set @d=@d*2;
INSERT INTO t1 (i,j) SELECT i+@d, j+@d from t1;
set @d=@d*2;
ANALYZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
EXPLAIN SELECT * FROM t1
WHERE i<100 AND j<10
ORDER BY i LIMIT 5;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	range	i,j	j	5	NULL	9	77.34	Using index condition; Using where; Using filesort
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`i` AS `i`,`test`.`t1`.`j` AS `j` from `test`.`t1` where ((`test`.`t1`.`i` < 100) and (`test`.`t1`.`j` < 10)) order by `test`.`t1`.`i` limit 5
SELECT * FROM t1
WHERE i<100 AND j<10
ORDER BY i LIMIT 5;
pk	i	j
1	1	1
2	2	2
3	3	3
4	4	4
6	5	5
DROP TABLE t1;
CREATE TABLE t0 (
i0 INTEGER NOT NULL
);
INSERT INTO t0 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
CREATE TABLE t1 (
pk INTEGER PRIMARY KEY,
i1 INTEGER NOT NULL,
i2 INTEGER NOT NULL,
INDEX k1 (i1),
INDEX k2 (i1,i2)
) ENGINE=InnoDB;
INSERT INTO t1
SELECT a0.i0 + 10*a1.i0 + 100*a0.i0 + 1000*a1.i0,
(a0.i0 + 10*a1.i0 + 100*a0.i0 + 1000*a1.i0) % 1000,
(a0.i0 + 10*a1.i0 + 100*a0.i0 + 1000*a1.i0) % 1000
FROM t0 AS a0, t0 AS a1;
CREATE TABLE t2 (
pk INTEGER PRIMARY KEY,
i1 INTEGER NOT NULL,
INDEX k1 (i1)
) ENGINE=InnoDB;
INSERT INTO t2
SELECT a0.i0 + 10*a1.i0 + 100*a0.i0 + 1000*a1.i0,
(a0.i0 + 10*a1.i0 + 100*a0.i0 + 1000*a1.i0) % 500
FROM t0 AS a0, t0 AS a1;
ANALYZE TABLE t1,t2;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
test.t2	analyze	status	OK
# Query should use index to optimize the ORDER BY LIMIT
EXPLAIN SELECT * FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1
WHERE t1.pk > 7000 and t1.i1 > 2
ORDER BY t1.i1 LIMIT 2;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	index	PRIMARY,k1,k2	k1	4	NULL	6	29.70	Using where
1	SIMPLE	t2	NULL	ref	k1	k1	4	test.t1.i1	1	100.00	Using index
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`i1` AS `i1`,`test`.`t1`.`i2` AS `i2`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`i1` AS `i1` from `test`.`t1` straight_join `test`.`t2` where ((`test`.`t2`.`i1` = `test`.`t1`.`i1`) and (`test`.`t1`.`pk` > 7000) and (`test`.`t1`.`i1` > 2)) order by `test`.`t1`.`i1` limit 2
# Query should not make the switch to use index to
# optimize ORDER BY LIMIT. So should be using filesort
EXPLAIN SELECT * FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1
WHERE t1.pk > 7000 and t1.i1 > 2
ORDER BY t1.i1 LIMIT 5;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	range	PRIMARY,k1,k2	PRIMARY	4	NULL	30	99.00	Using where; Using filesort
1	SIMPLE	t2	NULL	ref	k1	k1	4	test.t1.i1	1	100.00	Using index
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`i1` AS `i1`,`test`.`t1`.`i2` AS `i2`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`i1` AS `i1` from `test`.`t1` straight_join `test`.`t2` where ((`test`.`t2`.`i1` = `test`.`t1`.`i1`) and (`test`.`t1`.`pk` > 7000) and (`test`.`t1`.`i1` > 2)) order by `test`.`t1`.`i1` limit 5
SELECT * FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1
WHERE t1.pk > 7000 and t1.i1 > 2
ORDER BY t1.i1 LIMIT 5;
pk	i1	i2	pk	i1
7070	70	70	7070	70
8080	80	80	8080	80
9090	90	90	9090	90
7171	171	171	7171	171
8181	181	181	8181	181
# Changing range condition on i1 should make
# key on i1 get picked to give the order
EXPLAIN SELECT * FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1
WHERE t1.pk > 7000 and t1.i1 > 800
ORDER BY t1.i1 LIMIT 5;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	range	PRIMARY,k1,k2	k2	4	NULL	20	30.00	Using where; Using index
1	SIMPLE	t2	NULL	ref	k1	k1	4	test.t1.i1	1	100.00	Using index
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`i1` AS `i1`,`test`.`t1`.`i2` AS `i2`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`i1` AS `i1` from `test`.`t1` straight_join `test`.`t2` where ((`test`.`t2`.`i1` = `test`.`t1`.`i1`) and (`test`.`t1`.`pk` > 7000) and (`test`.`t1`.`i1` > 800)) order by `test`.`t1`.`i1` limit 5
SELECT * FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1
WHERE t1.pk > 7000 and t1.i1 > 800
ORDER BY t1.i1 LIMIT 5;
pk	i1	i2	pk	i1
# Use range condition only on pk to see if switch
# happens just for ORDER BY LIMIT
# Should not happen unless range results in too
# many records
EXPLAIN SELECT * FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1
WHERE t1.pk > 7000 ORDER BY t1.i1 LIMIT 5;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	range	PRIMARY,k1,k2	PRIMARY	4	NULL	30	100.00	Using where; Using filesort
1	SIMPLE	t2	NULL	ref	k1	k1	4	test.t1.i1	1	100.00	Using index
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`i1` AS `i1`,`test`.`t1`.`i2` AS `i2`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`i1` AS `i1` from `test`.`t1` straight_join `test`.`t2` where ((`test`.`t2`.`i1` = `test`.`t1`.`i1`) and (`test`.`t1`.`pk` > 7000)) order by `test`.`t1`.`i1` limit 5
SELECT * FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1
WHERE t1.pk > 7000 ORDER BY t1.i1 LIMIT 5;
pk	i1	i2	pk	i1
7070	70	70	7070	70
8080	80	80	8080	80
9090	90	90	9090	90
7171	171	171	7171	171
8181	181	181	8181	181
EXPLAIN SELECT * FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1
WHERE t1.pk > 1000 ORDER BY t1.i1 LIMIT 5;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	index	PRIMARY,k1,k2	k1	4	NULL	5	90.00	Using where
1	SIMPLE	t2	NULL	ref	k1	k1	4	test.t1.i1	1	100.00	Using index
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`i1` AS `i1`,`test`.`t1`.`i2` AS `i2`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`i1` AS `i1` from `test`.`t1` straight_join `test`.`t2` where ((`test`.`t2`.`i1` = `test`.`t1`.`i1`) and (`test`.`t1`.`pk` > 1000)) order by `test`.`t1`.`i1` limit 5
SELECT * FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1
WHERE t1.pk > 1000 ORDER BY t1.i1 LIMIT 5;
pk	i1	i2	pk	i1
1010	10	10	1010	10
2020	20	20	2020	20
3030	30	30	3030	30
4040	40	40	4040	40
5050	50	50	5050	50
# check if switch happens when the index for order 
# by is non-covering
EXPLAIN SELECT t1.i1,t1.i2 FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1 
WHERE t1.pk > 100 ORDER BY t1.i1 LIMIT 5;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	index	PRIMARY,k1,k2	k1	4	NULL	5	99.00	Using where
1	SIMPLE	t2	NULL	ref	k1	k1	4	test.t1.i1	1	100.00	Using index
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`i1` AS `i1`,`test`.`t1`.`i2` AS `i2` from `test`.`t1` straight_join `test`.`t2` where ((`test`.`t2`.`i1` = `test`.`t1`.`i1`) and (`test`.`t1`.`pk` > 100)) order by `test`.`t1`.`i1` limit 5
SELECT t1.i1,t1.i2 FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1 
WHERE t1.pk > 100 ORDER BY t1.i1 LIMIT 5;
i1	i2
10	10
20	20
30	30
40	40
50	50
# Reduce the fanout for table t2 and check
# that index for order by is not choosen
EXPLAIN SELECT * FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1
WHERE t1.pk > 7000 and t2.pk = 100 ORDER BY t1.i1 LIMIT 5;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	range	PRIMARY,k1,k2	PRIMARY	4	NULL	30	100.00	Using where; Using filesort
1	SIMPLE	t2	NULL	const	PRIMARY,k1	PRIMARY	4	const	1	5.00	Using where
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`i1` AS `i1`,`test`.`t1`.`i2` AS `i2`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`i1` AS `i1` from `test`.`t1` straight_join `test`.`t2` where ((`test`.`t2`.`i1` = `test`.`t1`.`i1`) and (`test`.`t2`.`pk` = 100) and (`test`.`t1`.`pk` > 7000)) order by `test`.`t1`.`i1` limit 5
SELECT * FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1
WHERE t1.pk > 7000 and t2.pk = 100 ORDER BY t1.i1 LIMIT 5;
pk	i1	i2	pk	i1
# Increase the fanout to see if index gets choosen
# for order by for which range scan was choosen
# earlier
INSERT INTO t2
SELECT a0.i0 + 10*a1.i0 + 100*a0.i0 + 1000*a1.i0 + 1,
(a0.i0 + 10*a1.i0 + 100*a0.i0 + 1000*a1.i0) % 500
FROM t0 AS a0, t0 AS a1;
ANALYZE TABLE t2;
Table	Op	Msg_type	Msg_text
test.t2	analyze	status	OK
EXPLAIN SELECT * FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1
WHERE t1.pk > 7000 ORDER BY t1.i1 LIMIT 5;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	index	PRIMARY,k1,k2	k1	4	NULL	6	30.00	Using where
1	SIMPLE	t2	NULL	ref	k1	k1	4	test.t1.i1	2	100.00	Using index
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`i1` AS `i1`,`test`.`t1`.`i2` AS `i2`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`i1` AS `i1` from `test`.`t1` straight_join `test`.`t2` where ((`test`.`t2`.`i1` = `test`.`t1`.`i1`) and (`test`.`t1`.`pk` > 7000)) order by `test`.`t1`.`i1` limit 5
SELECT * FROM t1 STRAIGHT_JOIN t2 ON t1.i1=t2.i1
WHERE t1.pk > 7000 ORDER BY t1.i1 LIMIT 5;
pk	i1	i2	pk	i1
7070	70	70	7070	70
7070	70	70	7071	70
8080	80	80	8080	80
8080	80	80	8081	80
9090	90	90	9090	90
# Check if the index for order by is used when
# force index is done on order by
EXPLAIN SELECT * FROM t1 FORCE INDEX FOR ORDER BY (k2) STRAIGHT_JOIN t2 ON
t1.i1=t2.i1 WHERE t1.pk > 7000 ORDER BY t1.i1 LIMIT 5;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	index	PRIMARY,k1,k2	k2	8	NULL	6	30.00	Using where; Using index
1	SIMPLE	t2	NULL	ref	k1	k1	4	test.t1.i1	2	100.00	Using index
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`i1` AS `i1`,`test`.`t1`.`i2` AS `i2`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`i1` AS `i1` from `test`.`t1` FORCE INDEX FOR ORDER BY (`k2`) straight_join `test`.`t2` where ((`test`.`t2`.`i1` = `test`.`t1`.`i1`) and (`test`.`t1`.`pk` > 7000)) order by `test`.`t1`.`i1` limit 5
SELECT * FROM t1 FORCE INDEX FOR ORDER BY (k2) STRAIGHT_JOIN t2 ON
t1.i1=t2.i1 WHERE t1.pk > 7000 ORDER BY t1.i1 LIMIT 5;
pk	i1	i2	pk	i1
7070	70	70	7070	70
7070	70	70	7071	70
8080	80	80	8080	80
8080	80	80	8081	80
9090	90	90	9090	90
DROP TABLE t0, t1, t2;
#
# Bug #26483909: INCORRECT BEHAVIOR FOR QUERY WITH DISTINCT
#                and ORDER BY ... LIMIT.
#
CREATE TABLE t1 (
pk int(11) NOT NULL,
col_int int(11),
col_varchar_key varchar(20),
PRIMARY KEY (pk),
KEY col_varchar_key (col_varchar_key),
KEY col_varchar_key_2 (col_varchar_key(5))
);
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
INSERT INTO t1 VALUES (1,2,'t'), (2,5,'efqsdksj'),
(3,NULL,'fqsdksjijcs'),(4,8,'qsdksjijc'),
(5,40,NULL),(6,3,'sdksji'),(7,2,NULL),
(8,3,'dks'),(9,0,'ksjijcsz'),
(10,84,'sjijcszxwbjj');
ANALYZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
SET @@SESSION.sql_mode='NO_ENGINE_SUBSTITUTION';
EXPLAIN SELECT DISTINCT col_int
FROM t1
WHERE col_varchar_key <> 'c'
   OR col_varchar_key > 'w'
ORDER BY col_varchar_key
LIMIT 100;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	range	col_varchar_key,col_varchar_key_2	col_varchar_key_2	23	NULL	8	100.00	Using where; Using temporary; Using filesort
Warnings:
Note	1003	/* select#1 */ select distinct `test`.`t1`.`col_int` AS `col_int` from `test`.`t1` where ((`test`.`t1`.`col_varchar_key` <> 'c') or (`test`.`t1`.`col_varchar_key` > 'w')) order by `test`.`t1`.`col_varchar_key` limit 100
SELECT DISTINCT col_int
FROM t1
WHERE col_varchar_key <> 'c'
   OR col_varchar_key > 'w'
ORDER BY col_varchar_key
LIMIT 100;
col_int
3
5
NULL
0
8
84
2
DROP TABLE t1;
#
# Bug#29487181 INCORRECT 'ROWS' AND 'FILTERED' ESTIMATE IN
#              'ORDER BY ... LIMIT .' QUERIES
#
CREATE TABLE t1 (
col_int_unique INT DEFAULT NULL,
col_int_key INT DEFAULT NULL,
UNIQUE KEY col_int_unique (col_int_unique),
KEY col_int_key (col_int_key)
);
INSERT INTO t1 VALUES (49,49), (9,7), (0,1), (2,42);
CREATE TABLE t2 (
col_int_unique INT DEFAULT NULL,
pk INT NOT NULL,
PRIMARY KEY (pk),
UNIQUE KEY col_int_unique (col_int_unique)
);
INSERT INTO t2 VALUES (2,8), (5,2), (6,1);
ANALYZE TABLE t1,t2;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
test.t2	analyze	status	OK
EXPLAIN
SELECT STRAIGHT_JOIN t1.col_int_key AS field1
FROM t1 JOIN t2
ON t2.pk = t1.col_int_unique OR
t2.col_int_unique = t1.col_int_key
ORDER BY field1 LIMIT 2;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	ALL	col_int_unique,col_int_key	NULL	NULL	NULL	4	100.00	Using filesort
1	SIMPLE	t2	NULL	ALL	PRIMARY,col_int_unique	NULL	NULL	NULL	3	55.56	Range checked for each record (index map: 0x3)
Warnings:
Note	1003	/* select#1 */ select straight_join `test`.`t1`.`col_int_key` AS `field1` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`pk` = `test`.`t1`.`col_int_unique`) or (`test`.`t2`.`col_int_unique` = `test`.`t1`.`col_int_key`)) order by `field1` limit 2
DROP TABLE t1,t2;