308 lines
13 KiB
Plaintext
308 lines
13 KiB
Plaintext
#
|
|
# 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;
|