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