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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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32
mysql-test/main/invisible_field_debug.result
View File

@@ -249,10 +249,10 @@ b
alter table t1 add index(a);
alter table t1 add index(a,b);
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 NULL NULL NULL YES BTREE
t1 1 a_2 1 a A NULL NULL NULL YES BTREE
t1 1 a_2 2 b 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
t1 1 a_2 1 a A NULL NULL NULL YES BTREE NO
t1 1 a_2 2 b A NULL NULL NULL YES BTREE NO
drop table t1;
set debug_dbug= "+d,test_pseudo_invisible";
Create table t1( a int default(99) invisible, b int);
@@ -280,7 +280,7 @@ ERROR 42000: Key column 'invisible' doesn't exist in table
alter table t1 add index(b,invisible);
ERROR 42000: Key column 'invisible' doesn't exist in table
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
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
drop table t1;
set debug_dbug= "+d,test_completely_invisible";
Create table t1( a int default(99) invisible, b int);
@@ -308,17 +308,17 @@ ERROR 42000: Key column 'invisible' doesn't exist in table
alter table t1 add index(b,invisible);
ERROR 42000: Key column 'invisible' doesn't exist in table
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
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
drop table t1;
set debug_dbug= "+d,test_completely_invisible,test_invisible_index";
Create table t1( a int default(99) , b int,c int, index(b));
set debug_dbug=@old_debug;
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 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 b 1 b A NULL NULL NULL YES BTREE NO
select * from INFORMATION_SCHEMA.STATISTICS where TABLE_SCHEMA ='test' and table_name='t1';
TABLE_CATALOG TABLE_SCHEMA TABLE_NAME NON_UNIQUE INDEX_SCHEMA INDEX_NAME SEQ_IN_INDEX COLUMN_NAME COLLATION CARDINALITY SUB_PART PACKED NULLABLE INDEX_TYPE COMMENT INDEX_COMMENT
def test t1 1 test b 1 b A NULL NULL NULL YES BTREE
TABLE_CATALOG TABLE_SCHEMA TABLE_NAME NON_UNIQUE INDEX_SCHEMA INDEX_NAME SEQ_IN_INDEX COLUMN_NAME COLLATION CARDINALITY SUB_PART PACKED NULLABLE INDEX_TYPE COMMENT INDEX_COMMENT IGNORED
def test t1 1 test b 1 b A NULL NULL NULL YES BTREE NO
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
@@ -359,8 +359,8 @@ invisible a b
9 7 7
set debug_dbug=@old_debug;
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 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 b 1 b A NULL NULL NULL YES BTREE NO
create index a1 on t1(invisible);
ERROR 42000: Key column 'invisible' doesn't exist in table
set debug_dbug= "+d,test_completely_invisible,test_invisible_index";
@@ -374,10 +374,10 @@ explain select * from t1 where invisible =9;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL invisible_2 NULL NULL NULL 7 Using where
show indexes in 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 NULL NULL NULL YES BTREE
t1 1 invisible 1 c A NULL NULL NULL YES BTREE
t1 1 invisible_2 1 invisible 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 b 1 b A NULL NULL NULL YES BTREE NO
t1 1 invisible 1 c A NULL NULL NULL YES BTREE NO
t1 1 invisible_2 1 invisible A NULL NULL NULL YES BTREE NO
drop table t1;
set @old_debug= @@debug_dbug;
CREATE TABLE t1 (i INT );