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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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30
mysql-test/suite/funcs_1/r/is_table_constraints.result
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@@ -120,16 +120,16 @@ def db_datadict my_idx2 db_datadict t1 UNIQUE
def db_datadict PRIMARY db_datadict t1 PRIMARY KEY
def db_datadict PRIMARY db_datadict t2 PRIMARY KEY
SHOW INDEXES FROM db_datadict.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 f1 ### ### ### ### ### ### ###
t1 0 PRIMARY 2 f2 ### ### ### ### ### ### ###
t1 0 my_idx1 1 f6 ### ### ### ### ### ### ###
t1 0 my_idx1 2 f1 ### ### ### ### ### ### ###
t1 0 my_idx2 1 f3 ### ### ### ### ### ### ###
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 f1 ### ### ### ### ### ### ### NO
t1 0 PRIMARY 2 f2 ### ### ### ### ### ### ### NO
t1 0 my_idx1 1 f6 ### ### ### ### ### ### ### NO
t1 0 my_idx1 2 f1 ### ### ### ### ### ### ### NO
t1 0 my_idx2 1 f3 ### ### ### ### ### ### ### NO
SHOW INDEXES FROM db_datadict.t2;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t2 0 PRIMARY 1 f1 ### ### ### ### ### ### ###
t2 0 PRIMARY 2 f2 ### ### ### ### ### ### ###
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t2 0 PRIMARY 1 f1 ### ### ### ### ### ### ### NO
t2 0 PRIMARY 2 f2 ### ### ### ### ### ### ### NO
connect testuser1, localhost, testuser1, , db_datadict;
SHOW GRANTS FOR 'testuser1'@'localhost';
Grants for testuser1@localhost
@@ -143,12 +143,12 @@ def db_datadict my_idx1 db_datadict t1 UNIQUE
def db_datadict my_idx2 db_datadict t1 UNIQUE
def db_datadict PRIMARY db_datadict t1 PRIMARY KEY
SHOW INDEXES FROM db_datadict.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 f1 ### ### ### ### ### ### ###
t1 0 PRIMARY 2 f2 ### ### ### ### ### ### ###
t1 0 my_idx1 1 f6 ### ### ### ### ### ### ###
t1 0 my_idx1 2 f1 ### ### ### ### ### ### ###
t1 0 my_idx2 1 f3 ### ### ### ### ### ### ###
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 f1 ### ### ### ### ### ### ### NO
t1 0 PRIMARY 2 f2 ### ### ### ### ### ### ### NO
t1 0 my_idx1 1 f6 ### ### ### ### ### ### ### NO
t1 0 my_idx1 2 f1 ### ### ### ### ### ### ### NO
t1 0 my_idx2 1 f3 ### ### ### ### ### ### ### NO
SHOW INDEXES FROM db_datadict.t2;
ERROR 42000: SELECT command denied to user 'testuser1'@'localhost' for table 't2'
connection default;