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#
# MDEV-6434: Wrong result (extra rows) with ORDER BY, multiple-column index, InnoDB
#
CREATE TABLE t1 (a INT, b INT, c INT, d TEXT, KEY idx(a,b,c)) ENGINE=InnoDB
STATS_PERSISTENT=0;
INSERT INTO t1 (a,c) VALUES
(8, 9),(8, 10),(13, 15),(16, 17),(16, 18),(16, 19),(20, 21),
(20, 22),(20, 24),(20, 25),(20, 26),(20, 27),(20, 28);
SELECT * FROM t1 WHERE a = 8 AND (b = 1 OR b IS NULL) ORDER BY c;
a b c d
8 NULL 9 NULL
8 NULL 10 NULL
DROP TABLE t1;
#
# MDEV-9457: Poor query plan chosen for ORDER BY query by a recent 10.1
#
create table t1 (
pk int primary key,
key1 int,
key2 int,
col1 char(255),
key(key1),
key(key2)
) engine=innodb stats_persistent=0;
insert into t1
select seq,seq,seq,repeat('abcd', 63) from seq_0_to_9999;
# The following must NOT use 'index' on PK.
# It should use index_merge(key1,key2) + filesort
explain
select *
from t1
where key1<3 or key2<3
order by pk;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL # Using sort_union(key1,key2); Using where; Using filesort
explain
select *
from t1
where key1<3 or key2<3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL # Using sort_union(key1,key2); Using where
drop table t1;
#
# MDEV-18094: Query with order by limit picking index scan over filesort
#
create table t0 (a int);
INSERT INTO t0 VALUES (0),(0),(0),(0),(2),(0),(0),(1),(1),(0);
CREATE TABLE t1 (
a int(11),
b int(11),
c int(11),
KEY a_c (a,c),
KEY a_b (a,b)
) ENGINE=InnoDB;
insert into t1 select A.a , B.a, C.a from t0 A, t0 B, t0 C;
select count(*) from t1;
count(*)
1000
select count(*) from t1 where a=1;
count(*)
200
select count(*) from t1 where a=1 and c=2;
count(*)
20
# should use ref access
explain select a,b,c from t1 where a=1 and c=2 order by b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a_c,a_b a_c 10 const,const 20 Using where; Using filesort
# all should use range access
explain select a,b,c from t1 where a=1 and c=2 order by b limit 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a_c,a_b a_c 10 const,const 20 Using where; Using filesort
explain select a,b,c from t1 where a=1 and c=2 order by b limit 300;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a_c,a_b a_c 10 const,const 20 Using where; Using filesort
explain select a,b,c from t1 where a=1 and c=2 order by b limit 1000;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a_c,a_b a_c 10 const,const 20 Using where; Using filesort
drop table t1,t0;
# Start of 10.2 tests
#
# MDEV-14071: wrong results with orderby_uses_equalities=on
# (duplicate of MDEV-13994)
#
CREATE TABLE t1 (i int, j int, z int,PRIMARY KEY (i,j), KEY (z)) ENGINE=InnoDB
STATS_PERSISTENT=0;
CREATE TABLE t2 (i int, j int, PRIMARY KEY (i,j)) ENGINE=InnoDB
STATS_PERSISTENT=0;
CREATE TABLE t3 (j int, n varchar(5), PRIMARY KEY (j)) ENGINE=InnoDB
STATS_PERSISTENT=0;
INSERT INTO t1 VALUES
(127,0,1),(188,0,1),(206,0,1),(218,0,1),(292,0,1),(338,0,1),(375,0,1),
(381,0,1),(409,0,1),(466,0,1),(469,0,1),(498,0,1),(656,0,1);
INSERT INTO t1 VALUES
(77,4,0),(86,7,0),(96,6,0),(96,7,0),(99,9,0),(99,10,0),(99,11,0),(104,4,0),
(106,5,0),(148,6,0),(177,6,0),(181,5,0),(188,8,0),(218,8,0),(253,7,0),
(268,4,0),(338,4,0),(409,7,0),(466,8,0),(469,8,0),(498,8,0),(656,8,0);
INSERT INTO t2 VALUES
(127,7),(188,8),(188,9),(206,6),(218,8),(218,9),(292,7),(338,4),(338,5),
(375,6),(381,5),(409,7),(409,8),(466,8),(466,9),(469,8),(469,9),(498,8),
(498,9),(656,8),(656,9);
INSERT INTO t3 VALUES
(4,'four'),(5,'five'),(6,'six'),(7,'seven'),(8,'eight'),(9,'nine');
SET @save_optimizer_switch=@@optimizer_switch;
SET optimizer_switch='orderby_uses_equalities=off';
SELECT i,n
FROM t1 INNER JOIN t2 USING (i,j) LEFT JOIN t3 USING (j)
WHERE i IN (SELECT i FROM t1 WHERE z=1) AND z=0 ORDER BY i;
i n
188 eight
218 eight
338 four
409 seven
466 eight
469 eight
498 eight
656 eight
SELECT i,n
FROM t1 x INNER JOIN t2 USING (i,j) LEFT JOIN t3 USING (j)
WHERE EXISTS (SELECT * FROM t1 WHERE i=x.i AND z=1) AND z=0 ORDER BY i;
i n
188 eight
218 eight
338 four
409 seven
466 eight
469 eight
498 eight
656 eight
SET optimizer_switch='orderby_uses_equalities=on';
SELECT i,n
FROM t1 INNER JOIN t2 USING (i,j) LEFT JOIN t3 USING (j)
WHERE i IN (SELECT i FROM t1 WHERE z=1) AND z=0 ORDER BY i;
i n
188 eight
218 eight
338 four
409 seven
466 eight
469 eight
498 eight
656 eight
SELECT i,n
FROM t1 x INNER JOIN t2 USING (i,j) LEFT JOIN t3 USING (j)
WHERE EXISTS (SELECT * FROM t1 WHERE i=x.i AND z=1) AND z=0 ORDER BY i;
i n
188 eight
218 eight
338 four
409 seven
466 eight
469 eight
498 eight
656 eight
set optimizer_switch= @save_optimizer_switch;
DROP TABLE t1,t2,t3;
#
# MDEV-25858: Query results are incorrect when indexes are added
#
CREATE TABLE t1 (id int NOT NULL PRIMARY KEY) engine=innodb
STATS_PERSISTENT=0;
insert into t1 values (1),(2),(3);
CREATE TABLE t2 (
id int NOT NULL PRIMARY KEY,
id2 int NOT NULL,
d1 datetime,
d2 timestamp NOT NULL,
KEY id2 (id2)
) engine=innodb stats_persistent=0;
insert into t2 values
(1,2,'2019-03-05 00:00:00','2019-03-06 00:00:00'),
(2,3,'2019-03-05 00:00:00','2019-03-06 00:00:00'),
(3,3,'2019-03-06 00:00:00','2019-03-05 00:00:00');
select
t1.id,t2.id
from
t1 left join
t2 on t2.id2 = t1.id and
t2.id = (select dd.id
from t2 dd
where
dd.id2 = t1.id and
d1 > '2019-02-06 00:00:00'
order by
dd.d1 desc, dd.d2 desc, dd.id desc limit 1
);
id id
1 NULL
2 1
3 3
create index for_latest_sort on t2 (d1, d2, id);
select
t1.id,t2.id
from
t1 left join
t2 on t2.id2 = t1.id and
t2.id = (select dd.id
from t2 dd
where
dd.id2 = t1.id and
d1 > '2019-02-06 00:00:00'
order by
dd.d1 desc, dd.d2 desc, dd.id desc limit 1
);
id id
1 NULL
2 1
3 3
# Now, same as above but use a DESC index
CREATE TABLE t3 (
id int NOT NULL PRIMARY KEY,
id2 int NOT NULL,
d1 datetime,
d2 timestamp NOT NULL,
KEY id2 (id2)
) engine=innodb;
insert into t3 values
(1,2,'2019-03-05 00:00:00','2019-03-06 00:00:00'),
(2,3,'2019-03-05 00:00:00','2019-03-06 00:00:00'),
(3,3,'2019-03-06 00:00:00','2019-03-05 00:00:00');
create index for_latest_sort on t3 (d1 desc, d2 desc, id desc);
select
t1.id,t3.id
from
t1 left join
t3 on t3.id2 = t1.id and
t3.id = (select dd.id
from t3 dd
where
dd.id2 = t1.id and
d1 > '2019-02-06 00:00:00'
order by
dd.d1 desc, dd.d2 desc, dd.id desc limit 1
);
id id
1 NULL
2 1
3 3
#
# MDEV-27270: Wrong query plan with Range Checked for Each Record and ORDER BY ... LIMIT
#
# This must NOT have "Range checked for each record" without any
# provisions to produce rows in the required ordering:
explain
select
t1.id,t2.id
from
t1 left join
t2 on t2.id2 = t1.id and
t2.id = (select dd.id
from t2 dd
where
dd.id2 = t1.id and
d1 > '2019-02-06 00:00:00'
order by
dd.d1, dd.d2, dd.id limit 1
);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL #
1 PRIMARY t2 eq_ref PRIMARY,id2 id2 8 test.t1.id,func # Using where; Using index
2 DEPENDENT SUBQUERY dd range id2,for_latest_sort for_latest_sort 6 NULL # Using where
drop table t1,t2,t3;
# End of 10.2 tests
#
# MDEV-26938 Support descending indexes internally in InnoDB
#
create table t1 (a int, b int, c int, key r (a desc, b asc));
insert t1 select seq % 10, seq div 10, seq from seq_1_to_55;
insert t1 values (NULL, NULL, NULL), (9, NULL, NULL);
explain select * from t1 force index(r) order by a,b limit 20;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 57 Using filesort
explain select * from t1 force index(r) order by a desc,b limit 20;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL r 10 NULL 20
select * from t1 force index(r) order by a desc,b limit 20;
a b c
9 NULL NULL
9 0 9
9 1 19
9 2 29
9 3 39
9 4 49
8 0 8
8 1 18
8 2 28
8 3 38
8 4 48
7 0 7
7 1 17
7 2 27
7 3 37
7 4 47
6 0 6
6 1 16
6 2 26
6 3 36
drop table t1;
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