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MDEV-7317: Make an index ignorable to the optimizer

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This feature adds the functionality of ignorability for indexes.
Indexes are not ignored be default.

To control index ignorability explicitly for a new index,
use IGNORE or NOT IGNORE as part of the index definition for
CREATE TABLE, CREATE INDEX, or ALTER TABLE.

Primary keys (explicit or implicit) cannot be made ignorable.

The table INFORMATION_SCHEMA.STATISTICS get a new column named IGNORED that
would store whether an index needs to be ignored or not.
This commit is contained in:
Varun Gupta
2021-02-25 19:59:51 +05:30
parent 71d30d01aa
commit f691d9865b
108 changed files with 2541 additions and 1422 deletions
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126
mysql-test/main/myisam.result
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@ -40,16 +40,16 @@ optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize status OK
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 0 PRIMARY 1 a A 5 NULL NULL BTREE
t1 1 b 1 b A 1 NULL NULL BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 0 PRIMARY 1 a A 5 NULL NULL BTREE NO
t1 1 b 1 b A 1 NULL NULL BTREE NO
optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize status Table is already up to date
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 0 PRIMARY 1 a A 5 NULL NULL BTREE
t1 1 b 1 b A 1 NULL NULL BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 0 PRIMARY 1 a A 5 NULL NULL BTREE NO
t1 1 b 1 b A 1 NULL NULL BTREE NO
drop table t1;
create table t1 (a int not null, b int not null, c int not null, primary key (a),key(b)) engine=myisam;
insert into t1 values (3,3,3),(1,1,1),(2,2,2),(4,4,4);
@ -339,13 +339,13 @@ optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize status OK
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 b 1 b A 5 NULL NULL YES BTREE
t1 1 c 1 c A 5 NULL NULL YES BTREE
t1 1 a 1 a A 1 NULL NULL BTREE
t1 1 a 2 b A 5 NULL NULL YES BTREE
t1 1 c_2 1 c A 5 NULL NULL YES BTREE
t1 1 c_2 2 a A 5 NULL NULL BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 b 1 b A 5 NULL NULL YES BTREE NO
t1 1 c 1 c A 5 NULL NULL YES BTREE NO
t1 1 a 1 a A 1 NULL NULL BTREE NO
t1 1 a 2 b A 5 NULL NULL YES BTREE NO
t1 1 c_2 1 c A 5 NULL NULL YES BTREE NO
t1 1 c_2 2 a A 5 NULL NULL BTREE NO
explain select * from t1,t2 where t1.a=t2.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL a NULL NULL NULL 2
@ -363,13 +363,13 @@ optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize status OK
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 b 1 b A 10 NULL NULL YES BTREE
t1 1 c 1 c A 10 NULL NULL YES BTREE
t1 1 a 1 a A 10 NULL NULL BTREE
t1 1 a 2 b A 10 NULL NULL YES BTREE
t1 1 c_2 1 c A 10 NULL NULL YES BTREE
t1 1 c_2 2 a A 10 NULL NULL BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 b 1 b A 10 NULL NULL YES BTREE NO
t1 1 c 1 c A 10 NULL NULL YES BTREE NO
t1 1 a 1 a A 10 NULL NULL BTREE NO
t1 1 a 2 b A 10 NULL NULL YES BTREE NO
t1 1 c_2 1 c A 10 NULL NULL YES BTREE NO
t1 1 c_2 2 a A 10 NULL NULL BTREE NO
explain select * from t1,t2 where t1.b=t2.b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL b NULL NULL NULL 2 Using where
@ -379,13 +379,13 @@ optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize status OK
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 b 1 b A 5 NULL NULL YES BTREE
t1 1 c 1 c A 5 NULL NULL YES BTREE
t1 1 a 1 a A 1 NULL NULL BTREE
t1 1 a 2 b A 5 NULL NULL YES BTREE
t1 1 c_2 1 c A 5 NULL NULL YES BTREE
t1 1 c_2 2 a A 5 NULL NULL BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 b 1 b A 5 NULL NULL YES BTREE NO
t1 1 c 1 c A 5 NULL NULL YES BTREE NO
t1 1 a 1 a A 1 NULL NULL BTREE NO
t1 1 a 2 b A 5 NULL NULL YES BTREE NO
t1 1 c_2 1 c A 5 NULL NULL YES BTREE NO
t1 1 c_2 2 a A 5 NULL NULL BTREE NO
explain select * from t1,t2 force index(c) where t1.a=t2.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
@ -613,29 +613,29 @@ test.t1 2924214226
drop table t1,t2;
create table t1 (a int, key (a));
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A NULL NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A NULL NULL NULL YES BTREE NO
alter table t1 disable keys;
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A NULL NULL NULL YES BTREE disabled
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A NULL NULL NULL YES BTREE disabled NO
create table t2 (a int);
set @@rand_seed1=31415926,@@rand_seed2=2718281828;
insert t1 select * from t2;
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A NULL NULL NULL YES BTREE disabled
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A NULL NULL NULL YES BTREE disabled NO
alter table t1 enable keys;
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A 1000 NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A 1000 NULL NULL YES BTREE NO
alter table t1 engine=heap;
alter table t1 disable keys;
Warnings:
Note 1031 Storage engine MEMORY of the table `test`.`t1` doesn't have this option
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a NULL 500 NULL NULL YES HASH
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a NULL 500 NULL NULL YES HASH NO
drop table t1,t2;
create table t1 ( a tinytext, b char(1), index idx (a(1),b) );
insert into t1 values (null,''), (null,'');
@ -679,16 +679,16 @@ Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A 10 NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A 10 NULL NULL YES BTREE NO
insert into t1 values (11);
delete from t1 where a=11;
check table t1;
Table Op Msg_type Msg_text
test.t1 check status OK
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A 10 NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A 10 NULL NULL YES BTREE NO
set myisam_stats_method=nulls_equal;
set @save_use_stat_tables = @@use_stat_tables;
set @@use_stat_tables = COMPLEMENTARY;
@ -702,16 +702,16 @@ Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A 5 NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A 5 NULL NULL YES BTREE NO
insert into t1 values (11);
delete from t1 where a=11;
check table t1;
Table Op Msg_type Msg_text
test.t1 check status OK
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A 5 NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A 5 NULL NULL YES BTREE NO
set @@use_stat_tables = @save_use_stat_tables;
set myisam_stats_method=DEFAULT;
show variables like 'myisam_stats_method';
@ -724,16 +724,16 @@ Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A 10 NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A 10 NULL NULL YES BTREE NO
insert into t1 values (11);
delete from t1 where a=11;
check table t1;
Table Op Msg_type Msg_text
test.t1 check status OK
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A 10 NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A 10 NULL NULL YES BTREE NO
drop table t1;
set myisam_stats_method=nulls_ignored;
show variables like 'myisam_stats_method';
@ -754,22 +754,22 @@ Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A 2 NULL NULL YES BTREE
t1 1 a 2 b A 4 NULL NULL YES BTREE
t1 1 a 3 c A 4 NULL NULL YES BTREE
t1 1 a 4 d A 4 NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A 2 NULL NULL YES BTREE NO
t1 1 a 2 b A 4 NULL NULL YES BTREE NO
t1 1 a 3 c A 4 NULL NULL YES BTREE NO
t1 1 a 4 d A 4 NULL NULL YES BTREE NO
delete from t1;
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A 0 NULL NULL YES BTREE
t1 1 a 2 b A 0 NULL NULL YES BTREE
t1 1 a 3 c A 0 NULL NULL YES BTREE
t1 1 a 4 d A 0 NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A 0 NULL NULL YES BTREE NO
t1 1 a 2 b A 0 NULL NULL YES BTREE NO
t1 1 a 3 c A 0 NULL NULL YES BTREE NO
t1 1 a 4 d A 0 NULL NULL YES BTREE NO
set myisam_stats_method=DEFAULT;
drop table t1;
set @@use_stat_tables = @save_use_stat_tables;
@ -1815,13 +1815,13 @@ Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A 8 NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A 8 NULL NULL YES BTREE NO
alter table t1 disable keys;
alter table t1 enable keys;
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A 8 NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 a 1 a A 8 NULL NULL YES BTREE NO
drop table t1;
create table t1 (c1 int) engine=myisam pack_keys=0;
create table t2 (c1 int) engine=myisam pack_keys=1;