mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 03:52:35 +01:00
201 lines
4.9 KiB
Text
201 lines
4.9 KiB
Text
create table t1 (
|
|
a int,
|
|
key (a desc)
|
|
);
|
|
insert into t1 select seq from seq_1_to_1000;
|
|
set optimizer_trace=1;
|
|
explain select * from t1 force index(a) where a in (2, 4, 6);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range a a 5 NULL 3 Using where; Using index
|
|
select json_detailed(json_extract(trace, '$**.range_access_plan.ranges')) as jd
|
|
from information_schema.optimizer_trace;
|
|
jd
|
|
[
|
|
[
|
|
"(6) <= (a DESC) <= (6)",
|
|
"(4) <= (a DESC) <= (4)",
|
|
"(2) <= (a DESC) <= (2)"
|
|
]
|
|
]
|
|
set optimizer_trace=default;
|
|
# These should go in reverse order:
|
|
select * from t1 force index(a) where a in (2, 4, 6);
|
|
a
|
|
6
|
|
4
|
|
2
|
|
drop table t1;
|
|
#
|
|
# Multi-part key tests
|
|
#
|
|
create table t1 (
|
|
a int not null,
|
|
b int not null,
|
|
key ab(a, b desc)
|
|
);
|
|
insert into t1 select A.seq, B.seq*10 from seq_1_to_10 A, seq_1_to_10 B;
|
|
set optimizer_trace=1;
|
|
explain select * from t1 force index(ab) where a>=8 and b>=50;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range ab ab 4 NULL 51 Using where; Using index
|
|
select json_detailed(json_extract(trace, '$**.range_access_plan.ranges')) as jd
|
|
from information_schema.optimizer_trace;
|
|
jd
|
|
[
|
|
["(8) <= (a)"]
|
|
]
|
|
explain select * from t1 force index(ab) where a>=8 and b<=50;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range ab ab 8 NULL 46 Using where; Using index
|
|
select json_detailed(json_extract(trace, '$**.range_access_plan.ranges')) as jd
|
|
from information_schema.optimizer_trace;
|
|
jd
|
|
[
|
|
["(8,50) <= (a,b DESC)"]
|
|
]
|
|
select * from t1 force index(ab) where a>=8 and b<=50;
|
|
a b
|
|
8 50
|
|
8 40
|
|
8 30
|
|
8 20
|
|
8 10
|
|
9 50
|
|
9 40
|
|
9 30
|
|
9 20
|
|
9 10
|
|
10 50
|
|
10 40
|
|
10 30
|
|
10 20
|
|
10 10
|
|
select * from t1 ignore index(ab) where a>=8 and b<=50 order by a, b desc;
|
|
a b
|
|
8 50
|
|
8 40
|
|
8 30
|
|
8 20
|
|
8 10
|
|
9 50
|
|
9 40
|
|
9 30
|
|
9 20
|
|
9 10
|
|
10 50
|
|
10 40
|
|
10 30
|
|
10 20
|
|
10 10
|
|
explain
|
|
select * from t1 where a between 2 and 4 and b between 50 and 80;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range ab ab 8 NULL 17 Using where; Using index
|
|
select json_detailed(json_extract(trace, '$**.range_access_plan.ranges')) as jd
|
|
from information_schema.optimizer_trace;
|
|
jd
|
|
[
|
|
["(2,80) <= (a,b DESC) <= (4,50)"]
|
|
]
|
|
select * from t1 where a between 2 and 4 and b between 50 and 80;
|
|
a b
|
|
2 80
|
|
2 70
|
|
2 60
|
|
2 50
|
|
3 80
|
|
3 70
|
|
3 60
|
|
3 50
|
|
4 80
|
|
4 70
|
|
4 60
|
|
4 50
|
|
drop table t1;
|
|
create table t2 (
|
|
a int not null,
|
|
b int not null,
|
|
key ab(a desc, b desc)
|
|
);
|
|
insert into t2 select A.seq, B.seq*10 from seq_1_to_10 A, seq_1_to_10 B;
|
|
explain
|
|
select * from t2 where a between 2 and 4;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 range ab ab 4 NULL 40 Using where; Using index
|
|
select json_detailed(json_extract(trace, '$**.range_access_plan.ranges')) as jd
|
|
from information_schema.optimizer_trace;
|
|
jd
|
|
[
|
|
["(4) <= (a DESC) <= (2)"]
|
|
]
|
|
explain
|
|
select * from t2 where a between 2 and 4 and b between 50 and 80;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 range ab ab 8 NULL 31 Using where; Using index
|
|
select json_detailed(json_extract(trace, '$**.range_access_plan.ranges')) as jd
|
|
from information_schema.optimizer_trace;
|
|
jd
|
|
[
|
|
["(4,80) <= (a DESC,b DESC) <= (2,50)"]
|
|
]
|
|
drop table t2;
|
|
#
|
|
# Check that "Using index for group-by" is disabled (it's not supported, yet)
|
|
#
|
|
CREATE TABLE t1 (p int NOT NULL, a int NOT NULL, PRIMARY KEY (p,a desc));
|
|
insert into t1 select 2,seq from seq_0_to_1000;
|
|
EXPLAIN select MIN(a) from t1 where p = 2 group by p;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ref PRIMARY PRIMARY 4 const 1000 Using index
|
|
select json_detailed(json_extract(trace, '$**.potential_group_range_indexes')) as jd
|
|
from information_schema.optimizer_trace;
|
|
jd
|
|
[
|
|
[
|
|
{
|
|
"index": "PRIMARY",
|
|
"usable": false,
|
|
"cause": "Reverse-ordered (not supported yet)"
|
|
}
|
|
]
|
|
]
|
|
drop table t1;
|
|
set optimizer_trace=default;
|
|
#
|
|
# MDEV-27426: Wrong result upon query using index_merge with DESC key
|
|
#
|
|
CREATE TABLE t1 (pk INT, a INT, b int, KEY(a), PRIMARY KEY(pk DESC))
|
|
ENGINE=InnoDB;
|
|
INSERT INTO t1 VALUES (1,4,5),(2,9,6),(3,NULL,7),(4,NULL,8);
|
|
SELECT * FROM t1 WHERE pk > 10 OR a > 0;
|
|
pk a b
|
|
2 9 6
|
|
1 4 5
|
|
DROP TABLE t1;
|
|
#
|
|
# MDEV-27529: Wrong result upon query using index_merge with DESC key (#2)
|
|
#
|
|
create table t1 (
|
|
pk int,
|
|
a int,
|
|
b int,
|
|
primary key(pk desc),
|
|
key(a),
|
|
key(b)
|
|
) engine=innodb;
|
|
insert into t1 values (0, 111111, 255);
|
|
insert into t1 select seq+50000, NULL, seq+1000 from seq_1_to_260;
|
|
insert into t1 values (10000, NULL, 255);
|
|
insert into t1 select seq+20000, seq+20000, seq+20000 from seq_1_to_1500;
|
|
analyze table t1;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status Engine-independent statistics collected
|
|
test.t1 analyze status OK
|
|
# Must use ROR-intersect:
|
|
explain select * from t1 where b = 255 AND a IS NULL;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ref a,b b 5 const 2 Using where
|
|
select * from t1 where b = 255 AND a IS NULL;
|
|
pk a b
|
|
10000 NULL 255
|
|
drop table t1;
|