path: root/mysql-test/main/ignored_index.test

--echo #
--echo # MDEV-7317: Make an index ignorable to the optimizer
--echo #


--echo # Test of ALTER INDEX syntax.

CREATE TABLE t1 ( a INT, KEY (a) );
SHOW KEYS FROM t1;
ALTER TABLE t1 ALTER INDEX a IGNORED;
SHOW KEYS FROM t1;
ALTER TABLE t1 ALTER INDEX a NOT IGNORED;
SHOW KEYS FROM t1;
DROP TABLE t1;

--echo # Test of CREATE INDEX syntax with IGNORED indexes.

CREATE TABLE t1 ( a INT, b INT );
CREATE INDEX a_ignorable ON t1(a) IGNORED;
CREATE INDEX b_not_ignorable ON t1(a) NOT IGNORED;
CREATE INDEX a_b_ignorable ON t1(a, b) IGNORED;
SHOW INDEXES FROM t1;
DROP TABLE t1;

--echo # Test that IGNORED indexes are not used.

CREATE TABLE t1 ( a INT, KEY (a) );
CREATE TABLE t2 ( a INT, KEY (a) IGNORED );

INSERT INTO t1 VALUES (1), (2), (3), (4), (5);
INSERT INTO t2 SELECT * FROM t1;

ANALYZE TABLE t1, t2;

EXPLAIN SELECT a FROM t1;
ALTER TABLE t1 ALTER INDEX a IGNORED;
EXPLAIN SELECT a FROM t1;
ALTER TABLE t1 ALTER INDEX a NOT IGNORED;
EXPLAIN SELECT a FROM t1;

EXPLAIN SELECT a FROM t2;
ALTER TABLE t2 ALTER INDEX a NOT IGNORED;
EXPLAIN SELECT a FROM t2;

DROP TABLE t1, t2;

--echo # Test that renaming an index does not change ignorability and vice versa.

CREATE TABLE t1 (
  a INT, INDEX (a),
  b INT, INDEX (b) IGNORED
);

SHOW INDEXES FROM t1;

ALTER TABLE t1 RENAME INDEX a TO a1;
ALTER TABLE t1 RENAME INDEX b TO b1;

SHOW INDEXES FROM t1;

ALTER TABLE t1 ALTER INDEX a1 IGNORED;
ALTER TABLE t1 ALTER INDEX b1 NOT IGNORED;

SHOW INDEXES FROM t1;

DROP TABLE t1;

--echo # Test of SHOW CREATE TABLE.

CREATE TABLE t1 (
  a INT,
  b INT,
  c INT,
  INDEX (a) NOT IGNORED,
  INDEX (b) IGNORED,
  INDEX (c)
);

SHOW CREATE TABLE t1;

DROP TABLE t1;

--echo # Test that primary key indexes can't be made ignorable.

--error ER_PK_INDEX_CANT_BE_IGNORED
CREATE TABLE t1 ( a INT, PRIMARY KEY (a) IGNORED );
--error ER_PARSE_ERROR
CREATE TABLE t1 ( a INT PRIMARY KEY IGNORED );
--error ER_PARSE_ERROR
CREATE TABLE t1 ( a INT KEY IGNORED );
--error ER_PARSE_ERROR
ALTER TABLE t1 ALTER INDEX PRIMARY IGNORED;

CREATE TABLE t1(a INT NOT NULL);
--error ER_PK_INDEX_CANT_BE_IGNORED
ALTER TABLE t1 ADD PRIMARY KEY (a) IGNORED;

DROP TABLE t1;


CREATE TABLE t1 (
  a INT, KEY (a),
  b INT, KEY (b) IGNORED
);

--error ER_KEY_DOES_NOT_EXISTS
ALTER TABLE t1 RENAME INDEX no_such_index TO x;
--error ER_KEY_DOES_NOT_EXISTS
ALTER TABLE t1 ALTER INDEX no_such_index IGNORED;

DROP TABLE t1;


CREATE TABLE t1 (
  a INT, KEY (a),
  b INT, KEY (b) IGNORED
);

--error ER_KEY_DOES_NOT_EXISTS
ALTER TABLE t1 RENAME INDEX no_such_index TO x;
--error ER_KEY_DOES_NOT_EXISTS
ALTER TABLE t1 ALTER INDEX no_such_index IGNORED;


--echo #
--echo # Repeated alter actions. Should work.
--echo #
ALTER TABLE t1 ALTER INDEX a IGNORED, ALTER INDEX a NOT IGNORED;
SHOW INDEXES FROM t1;
ALTER TABLE t1 ALTER INDEX a NOT IGNORED, ALTER INDEX b IGNORED;
SHOW INDEXES FROM t1;


--echo #
--echo # Various combinations of RENAME INDEX and ALTER INDEX ... IGNORED.
--echo #
--error ER_KEY_DOES_NOT_EXISTS
ALTER TABLE t1 RENAME INDEX a TO x, RENAME INDEX x TO a;
--error ER_KEY_DOES_NOT_EXISTS
ALTER TABLE t1 RENAME INDEX a TO x, ALTER INDEX x IGNORED;
--error ER_KEY_DOES_NOT_EXISTS
ALTER TABLE t1 RENAME INDEX a TO x, ALTER INDEX a NOT IGNORED;
--error ER_KEY_DOES_NOT_EXISTS
ALTER TABLE t1 ALTER INDEX a NOT IGNORED, RENAME INDEX a TO x;


--echo #
--echo # Various algorithms and their effects.
--echo #

INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3);
ANALYZE TABLE t1;

--enable_info
ALTER TABLE t1 ALTER INDEX a IGNORED, ALGORITHM = COPY;
--disable_info
ANALYZE TABLE t1;
SHOW INDEXES FROM t1;

--enable_info
ALTER TABLE t1 ALTER INDEX a NOT IGNORED, ALGORITHM = INPLACE;
--disable_info
ANALYZE TABLE t1;
SHOW INDEXES FROM t1;

--enable_info
ALTER TABLE t1 ALTER INDEX a IGNORED, ALGORITHM = DEFAULT;
--disable_info
ANALYZE TABLE t1;
SHOW INDEXES FROM t1;

--enable_info
ALTER TABLE t1 ALTER INDEX a NOT IGNORED;
--disable_info
ANALYZE TABLE t1;
SHOW INDEXES FROM t1;

--error ER_KEY_DOES_NOT_EXISTS
ALTER TABLE t1 ADD INDEX ab(a, b), ALTER INDEX ab IGNORED;

DROP TABLE t1;


--echo #
--echo # The first NOT NULL UNIQUE index may of course be IGNORED if it is
--echo # not promoted to a primary key
--echo #

CREATE TABLE t1 (
  a INT NOT NULL,
  b INT NOT NULL PRIMARY KEY,
  UNIQUE KEY (a) IGNORED
);
SHOW INDEXES FROM t1;
DROP TABLE t1;

--echo # The check above applies only to the first NOT NULL UNIQUE index.
CREATE TABLE t1 (
  a INT NOT NULL,
  b INT NOT NULL,
  UNIQUE KEY (a),
  UNIQUE KEY (b) IGNORED
);
SHOW INDEXES FROM t1;
DROP TABLE t1;

--error ER_PK_INDEX_CANT_BE_IGNORED
CREATE TABLE t1 ( a INT NOT NULL, UNIQUE KEY (a) IGNORED);


CREATE TEMPORARY TABLE t1 ( a INT, KEY (a) IGNORED);
INSERT INTO t1 VALUES (0), (1), (2), (3);
SHOW INDEXES FROM t1;
EXPLAIN SELECT a FROM t1;

ALTER TABLE t1 ALTER INDEX a NOT IGNORED;
EXPLAIN SELECT a FROM t1;

DROP TABLE t1;

--echo #
--echo # IGNORED fulltext indexes.
--echo #
CREATE TABLE t1 (a VARCHAR(200), b TEXT, FULLTEXT (a,b));
INSERT INTO t1 VALUES('Some data', 'for full-text search');
ANALYZE TABLE t1;

let $query=
EXPLAIN SELECT * FROM t1 WHERE MATCH(a, b) AGAINST ("collections");

--eval $query
ALTER TABLE t1 ALTER INDEX a IGNORED;

--error ER_FT_MATCHING_KEY_NOT_FOUND
--eval $query

DROP TABLE t1;


--echo #
--echo # IGNORED indexes on AUTO_INCREMENT columns.
--echo #
CREATE TABLE t1 ( a INT AUTO_INCREMENT, KEY ( a ) );
INSERT INTO t1 VALUES (), (), ();
ANALYZE TABLE t1;

EXPLAIN SELECT a FROM t1;
ALTER TABLE t1 ALTER INDEX a IGNORED;
SHOW INDEXES FROM t1;
EXPLAIN SELECT a FROM t1;

DROP TABLE t1;

--echo #
--echo # IGNORED spatial indexes
--echo #


CREATE TABLE t1 (
  fid INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
  g GEOMETRY NOT NULL,
  SPATIAL KEY key1(g)
);

--disable_query_log
let $1=150;
let $2=150;
while ($1)
{
  eval INSERT INTO t1 (g) VALUES (GeomFromText('LineString($1 $1, $2 $2)'));
  dec $1;
  inc $2;
}
--enable_query_log

let $query= EXPLAIN SELECT fid, AsText(g) FROM t1
WHERE Within(g, GeomFromText('Polygon((140 140,160 140,160 160,140 160,140 140))'));

eval $query;
ALTER TABLE t1 ALTER INDEX key1 IGNORED;
SHOW INDEXES FROM t1;
eval $query;

DROP TABLE t1;

CREATE TABLE t1 ( a INT GENERATED ALWAYS AS (1), KEY key1(a));
INSERT INTO t1 VALUES (),(),();
SHOW INDEXES FROM t1;
EXPLAIN SELECT a FROM t1;
ALTER TABLE t1 ALTER INDEX key1 IGNORED;
SHOW INDEXES FROM t1;
EXPLAIN SELECT a FROM t1;
DROP TABLE t1;


--echo #
--echo # Partitioning on keys with an IGNORED index, IGNORED indexes over
--echo # partitioned tables.
--echo #

--source include/have_partition.inc

CREATE TABLE t1 (
  a CHAR(2) NOT NULL,
  b CHAR(2) NOT NULL,
  c INT(10) UNSIGNED NOT NULL,
  d VARCHAR(255) DEFAULT NULL,
  e VARCHAR(1000) DEFAULT NULL,
  KEY (a) IGNORED,
  KEY (b)
) PARTITION BY KEY (a) PARTITIONS 20;


INSERT INTO t1 (a, b, c, d, e) VALUES
('07', '03', 343, '1', '07_03_343'),
('01', '04', 343, '2', '01_04_343'),
('01', '06', 343, '3', '01_06_343'),
('01', '07', 343, '4', '01_07_343'),
('01', '08', 343, '5', '01_08_343'),
('01', '09', 343, '6', '01_09_343'),
('03', '03', 343, '7', '03_03_343'),
('03', '06', 343, '8', '03_06_343'),
('03', '07', 343, '9', '03_07_343'),
('04', '03', 343, '10', '04_03_343'),
('04', '06', 343, '11', '04_06_343'),
('05', '03', 343, '12', '05_03_343'),
('11', '03', 343, '13', '11_03_343'),
('11', '04', 343, '14', '11_04_343');

ANALYZE TABLE t1;

EXPLAIN SELECT a FROM t1;
EXPLAIN SELECT b FROM t1;
EXPLAIN SELECT * FROM t1 WHERE a = '04';
ALTER TABLE t1 ALTER INDEX a NOT IGNORED;
EXPLAIN SELECT a FROM t1;
EXPLAIN SELECT * FROM t1 WHERE a = '04';

ALTER TABLE t1 ALTER INDEX b IGNORED;
EXPLAIN SELECT b FROM t1;
DROP TABLE t1;

--echo #
--echo # Using FORCE INDEX for an IGNORED index
--echo #

CREATE TABLE t1(a INT, key k1(a));
INSERT INTO t1 VALUES (1),(2),(3);

EXPLAIN SELECT * FROM t1 FORCE INDEX(k1);
ALTER TABLE t1 ALTER INDEX k1 IGNORED;
SHOW CREATE TABLE t1;
--error ER_KEY_DOES_NOT_EXISTS
EXPLAIN SELECT * FROM t1 FORCE INDEX(k1);

DROP TABLE t1;

--echo #
--echo # MDEV-25075: Ignorable index makes the resulting CREATE TABLE invalid
--echo #

CREATE TABLE t1 (a INT, KEY (a));
ALTER TABLE t1 ALTER INDEX a IGNORED;
show create table t1;

DROP TABLE t1;

CREATE TABLE t1 ( a INT, KEY (a) IGNORED);
show create table t1;

DROP TABLE t1;

--echo #
--echo # Tests to check usage of IGNORED keyword
--echo #

CREATE TABLE IGNORED(a INT);
DROP TABLE IGNORED;

CREATE TABLE t1(a INT);
SELECT * FROM t1 IGNORED;

DELIMITER |;

CREATE FUNCTION f1(a INT) RETURNS INT
BEGIN
  DECLARE IGNORED INT DEFAULT 0;
  RETURN 0;
END|

CREATE FUNCTION f2(a INT) RETURNS INT
BEGIN
  DECLARE IGNORED INT DEFAULT 0;
  DECLARE x INT DEFAULT 0;
  SET x= IGNORED;
  RETURN 0;
END|

DELIMITER ;|
DROP TABLE t1;

DROP FUNCTION f1;
DROP FUNCTION f2;

DELIMITER |;
CREATE PROCEDURE test_sp()
BEGIN
   ignored:
   LOOP
      LEAVE ignored;
   END LOOP;
END|

DELIMITER ;|
DROP PROCEDURE test_sp;

DELIMITER |;
--error ER_UNKNOWN_SYSTEM_VARIABLE
CREATE PROCEDURE test_sp()
BEGIN
  set @@ignored= 1;
END|
DELIMITER ;|

DELIMITER |;
--error ER_UNKNOWN_SYSTEM_VARIABLE
CREATE PROCEDURE proc()
BEGIN
  SET IGNORED= a+b;
END |
DELIMITER ;|

--echo #
--echo # ALLOWING ALTER KEY syntax in ALTER TABLE
--echo #

CREATE TABLE t1 (a INT, KEY (a));
ALTER TABLE t1 ALTER INDEX a IGNORED;
SHOW CREATE TABLE t1;
DROP TABLE t1;
CREATE TABLE t1 (a INT, KEY (a));
ALTER TABLE t1 ALTER KEY a IGNORED;
SHOW CREATE TABLE t1;
DROP TABLE t1;

--echo #
--echo #  MDEV-25078, part #2: allow IF EXISTS
--echo #

create table t1 (a int, b int, c int, key(a), key(b), key(c));
alter table t1 alter key if exists no_such_key ignored;
alter table t1 alter key if exists a ignored;
show create table t1;
alter table t1
  alter key if exists no_such_key ignored,
  alter key if exists c ignored ;
show create table t1;
alter table t1 
  alter key if exists no_such_key not ignored, 
  alter key if exists c not ignored ;
show create table t1;
drop table t1;