mysql-test/main/subselect_mat_cost_bugs.test

#
# Test cases for bugs related to the implementation of
# MWL#89 cost-based choice between the materialization and in-to-exists
#
--source include/default_optimizer_switch.inc

--echo #
--echo # LP BUG#643424 valgrind warning in choose_subquery_plan()
--echo #

CREATE TABLE t1 (
  pk int(11) NOT NULL AUTO_INCREMENT,
  c1 int(11) DEFAULT NULL,
  c2 int(11) DEFAULT NULL,
  PRIMARY KEY (pk),
  KEY c2 (c2));

INSERT INTO t1 VALUES (1,NULL,2);
INSERT INTO t1 VALUES (2,7,9);
INSERT INTO t1 VALUES (9,NULL,8);

CREATE TABLE t2 (
  pk int(11) NOT NULL AUTO_INCREMENT,
  c1 int(11) DEFAULT NULL,
  c2 int(11) DEFAULT NULL,
  PRIMARY KEY (pk),
  KEY c2 (c2));

INSERT INTO t2 VALUES (1,1,7);

set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch='materialization=on,in_to_exists=on,semijoin=off';

SELECT pk FROM t1 WHERE (c2, c1) IN (SELECT c2, c2 FROM t2);

set session optimizer_switch=@save_optimizer_switch;

drop table t1, t2;


--echo #
--echo # LP BUG#652727 Crash in create_ref_for_key()
--echo #

CREATE TABLE t2 (
  pk int(11) NOT NULL AUTO_INCREMENT,
  c1 int(11) DEFAULT NULL,
  PRIMARY KEY (pk));

INSERT INTO t2 VALUES (10,7);
INSERT INTO t2 VALUES (11,1);
INSERT INTO t2 VALUES (17,NULL);

CREATE TABLE t1 (
  pk int(11) NOT NULL AUTO_INCREMENT,
  c1 int(11) DEFAULT NULL,
  PRIMARY KEY (pk));

INSERT INTO t1 VALUES (15,1);
INSERT INTO t1 VALUES (19,NULL);

CREATE TABLE t3 (c2 int(11) DEFAULT NULL, KEY c2 (c2));
INSERT INTO t3 VALUES (1);

set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch='materialization=on,in_to_exists=on,semijoin=off';

SELECT c2
FROM t3
WHERE (2, 6) IN (SELECT t1.c1, t1.c1 FROM t1 STRAIGHT_JOIN t2 ON t2.pk = t1.pk);

set session optimizer_switch=@save_optimizer_switch;
drop table t1, t2, t3;


--echo #
--echo # LP BUG#641245 Crash in Item_equal::contains
--echo #

CREATE TABLE t1 (
  pk int(11) NOT NULL AUTO_INCREMENT,
  c1 int(11) DEFAULT NULL,
  c2 int(11) DEFAULT NULL,
  c3 varchar(1) DEFAULT NULL,
  c4 varchar(1) DEFAULT NULL,
  PRIMARY KEY (pk),
  KEY c2 (c2),
  KEY c3 (c3,c2));

INSERT INTO t1 VALUES (10,7,8,'v','v');
INSERT INTO t1 VALUES (11,1,9,'r','r');
INSERT INTO t1 VALUES (12,5,9,'a','a');
INSERT INTO t1 VALUES (13,7,18,'v','v');
INSERT INTO t1 VALUES (14,1,19,'r','r');
INSERT INTO t1 VALUES (15,5,29,'a','a');
INSERT INTO t1 VALUES (17,7,38,'v','v');
INSERT INTO t1 VALUES (18,1,39,'r','r');
INSERT INTO t1 VALUES (19,5,49,'a','a');

create table t1a like t1;
insert into t1a select * from t1;

create table t1b like t1;
insert into t1b select * from t1;

CREATE TABLE t2 (
  pk int(11) NOT NULL AUTO_INCREMENT,
  c1 int(11) DEFAULT NULL,
  c2 int(11) DEFAULT NULL,
  c3 varchar(1) DEFAULT NULL,
  c4 varchar(1) DEFAULT NULL,
  PRIMARY KEY (pk),
  KEY c2 (c2),
  KEY c3 (c3,c2));

INSERT INTO t2 VALUES (1,NULL,2,'w','w');
INSERT INTO t2 VALUES (2,7,9,'m','m');

set @@optimizer_switch='materialization=off,in_to_exists=on,semijoin=off';

let $query=
SELECT pk
FROM t1
WHERE c1 IN
      (SELECT t1a.c1
       FROM (t1b JOIN t2 ON t2.c3 = t1b.c4) LEFT JOIN
            t1a ON (t1a.c2 = t1b.pk AND 2)
       WHERE t1.pk) ;
eval EXPLAIN EXTENDED $query;
eval $query;

DROP TABLE t1, t1a, t1b, t2;

--echo #
--echo # LP BUG#714808 Assertion `outer_lookup_keys <= outer_record_count'
--echo # failed with materialization

CREATE TABLE t1 ( pk int(11), PRIMARY KEY (pk)) ;
CREATE TABLE t2 ( f2 int(11)) ;
CREATE TABLE t3 ( f1 int(11), f3 varchar(1), KEY (f1)) ;
INSERT INTO t3 VALUES (7,'f');

set @@optimizer_switch='materialization=on,in_to_exists=on,semijoin=off';

EXPLAIN
SELECT t1.*
FROM t3 RIGHT JOIN t1 ON t1.pk = t3.f1
WHERE t3.f3 OR ( 3 ) IN ( SELECT f2 FROM t2 );

SELECT t1.*
FROM t3 RIGHT JOIN t1 ON t1.pk = t3.f1
WHERE t3.f3 OR ( 3 ) IN ( SELECT f2 FROM t2 );

drop table t1,t2,t3;

--echo #
--echo # LP BUG#714999 Second crash in select_describe() with nested subqueries
--echo #

CREATE TABLE t1 ( pk int(11)) ;
INSERT INTO t1 VALUES (29);

CREATE TABLE t2 ( f1 varchar(1)) ;
INSERT INTO t2 VALUES ('f'),('d');

CREATE TABLE t3 ( f2 varchar(1)) ;

EXPLAIN SELECT f2 FROM t3 WHERE (
        SELECT MAX( pk ) FROM t1
        WHERE EXISTS (
                SELECT max(f1)
                FROM t2 GROUP BY f1
        )
) IS NULL ;

drop table t1, t2, t3;

--echo #
--echo # LP BUG#715034 Item_sum_distinct::clear(): Assertion `tree != 0' failed
--echo #

CREATE TABLE t2 ( f2 int(11)) ;

CREATE TABLE t1 ( f3 int(11), KEY (f3)) ;
INSERT INTO t1 VALUES (6),(4);

set @tmp_optimizer_switch=@@optimizer_switch;
set optimizer_switch='derived_merge=off,derived_with_keys=off';

EXPLAIN
SELECT * FROM (SELECT * FROM t2) AS a2
WHERE (SELECT distinct SUM(distinct f3 ) FROM t1);

insert into t2 values (1),(2);
EXPLAIN
SELECT * FROM (SELECT * FROM t2) AS a2
WHERE (SELECT distinct SUM(distinct f3 ) FROM t1);

set optimizer_switch=@tmp_optimizer_switch;
drop table t1,t2;

--echo #
--echo # LP BUG#715027 Assertion `!table || (!table->read_set || bitmap_is_set(table->read_set, field_index))' failed
--echo #

CREATE TABLE t1 ( f1 int(11), PRIMARY KEY (f1)) ;
INSERT INTO t1 VALUES (28),(29);

CREATE TABLE t2 ( f2 int(11), f3 int(11), f10 varchar(1)) ;
INSERT INTO t2 VALUES (NULL,6,'f'),(4,2,'d');

set @tmp_optimizer_switch=@@optimizer_switch;
set optimizer_switch='derived_merge=off,derived_with_keys=off';

EXPLAIN
SELECT alias2.f2 AS field1
FROM t1 AS alias1 JOIN ( SELECT * FROM t2 ) AS alias2 ON alias2.f3 = alias1.f1
WHERE (
        SELECT t2.f2
        FROM t2 JOIN t1 ON t1.f1
        WHERE t1.f1 AND alias2.f10
)
ORDER BY field1 ;

SELECT alias2.f2 AS field1
FROM t1 AS alias1 JOIN ( SELECT * FROM t2 ) AS alias2 ON alias2.f3 = alias1.f1
WHERE (
        SELECT t2.f2
        FROM t2 JOIN t1 ON t1.f1
        WHERE t1.f1 AND alias2.f10
)
ORDER BY field1 ;

set optimizer_switch=@tmp_optimizer_switch;
drop table t1,t2;

--echo #
--echo # LP BUG#718578 Yet another Assertion `!table ||
--echo # (!table->read_set || bitmap_is_set(table->read_set, field_index))'

CREATE TABLE t1 ( f1 int(11), f2 int(11), f3 int(11)) ;
INSERT IGNORE INTO t1 VALUES (28,5,6),(29,NULL,4);

CREATE TABLE t2 ( f10 varchar(1) );
INSERT IGNORE INTO t2 VALUES (NULL);

SELECT f1 AS field1
FROM ( SELECT * FROM t1 ) AS alias1
WHERE (SELECT t1.f1
        FROM t2 JOIN t1 ON t1.f2
        WHERE alias1.f3 AND t1.f3) AND f2
ORDER BY field1;

drop table t1,t2;

--echo #
--echo # LP BUG#601124 Bug in eliminate_item_equal
--echo # leads to crash in Item_func::Item_func

CREATE TABLE t1 ( f1 int(11), f3 varchar(1)) ;
INSERT INTO t1 VALUES (5,'m'),(NULL,'c');

CREATE TABLE t2 ( f2 int(11), f3 varchar(1)) ;
INSERT INTO t2 VALUES (6,'f'),(2,'d');

CREATE TABLE t3 ( f2 int(11), f3 varchar(1)) ;
INSERT INTO t3 VALUES (6,'f'),(2,'d');

SELECT * FROM t3
WHERE ( f2 ) IN (SELECT t1.f1
                 FROM t1 STRAIGHT_JOIN t2 ON t2.f3 = t1.f3
                 WHERE t2.f3 = 'c');
drop table t1,t2,t3;


--echo #
--echo # LP BUG#718593 Crash in substitute_for_best_equal_field -> eliminate_item_equal ->
--echo # Item_field::find_item_equal -> Item_equal::contains
--echo #

set @save_optimizer_switch=@@optimizer_switch;
SET @@optimizer_switch = 'semijoin=off';

CREATE TABLE t1 ( f3 int(11), f10 varchar(1), f11 varchar(1)) ;
INSERT IGNORE INTO t1 VALUES (6,'f','f'),(2,'d','d');

CREATE TABLE t2 ( f12 int(11), f13 int(11)) ;
insert into t2 values (1,2), (3,4);

EXPLAIN
SELECT * FROM t2
WHERE ( f12 ) IN (
        SELECT alias2.f3
        FROM t1 AS alias1 JOIN t1 AS alias2 ON alias2.f10 = alias1.f11
        WHERE alias1.f11 OR alias1.f3 = 50 AND alias1.f10
);
SELECT * FROM t2
WHERE ( f12 ) IN (
        SELECT alias2.f3
        FROM t1 AS alias1 JOIN t1 AS alias2 ON alias2.f10 = alias1.f11
        WHERE alias1.f11 OR alias1.f3 = 50 AND alias1.f10
);

EXPLAIN
SELECT * FROM t2
WHERE ( f12 ) IN (
        SELECT alias2.f3
        FROM t1 AS alias1, t1 AS alias2
        WHERE (alias2.f10 = alias1.f11) AND (alias1.f11 OR alias1.f3 = 50 AND alias1.f10));
SELECT * FROM t2
WHERE ( f12 ) IN (
        SELECT alias2.f3
        FROM t1 AS alias1, t1 AS alias2
        WHERE (alias2.f10 = alias1.f11) AND (alias1.f11 OR alias1.f3 = 50 AND alias1.f10));

set @@optimizer_switch=@save_optimizer_switch;
drop table t1, t2;


--echo #
--echo # MWL#89: test introduced after Sergey Petrunia's review - test that
--echo # keyparts wihtout index prefix are used with the IN-EXISTS strategy.
--echo #

create table t1 (c1 int);
insert into t1 values (1), (2), (3);

create table t2 (kp1 int, kp2 int, c2 int, filler char(100));
insert into t2 values (0,0,0,'filler'),(0,1,1,'filler'),(0,2,2,'filler'),(0,3,3,'filler');

create index key1 on t2 (kp1, kp2);
create index key2 on t2 (kp1);
create index key3 on t2 (kp2);

SET @@optimizer_switch='materialization=off,semijoin=off,in_to_exists=on';

analyze table t2;

explain
select c1 from t1 where c1 in (select kp1 from t2 where kp2 = 10 and c2 = 4) or c1 > 7;
select c1 from t1 where c1 in (select kp1 from t2 where kp2 = 10 and c2 = 4) or c1 > 7;

set @@optimizer_switch='default';

drop table t1, t2;

--echo #
--echo # LP BUG#800679: Assertion `outer_join->table_count > 0' failed in
--echo # JOIN::choose_subquery_plan() with materialization=on,semijoin=off
--echo #

CREATE TABLE t1 ( f1 int);
insert into t1 values (1),(2);
CREATE TABLE t2 ( f1 int);
insert into t2 values (1),(2);

SET @@optimizer_switch='materialization=on,semijoin=off';

EXPLAIN
SELECT * FROM t1
WHERE (f1) IN (SELECT f1 FROM t2)
LIMIT 0;

SELECT * FROM t1
WHERE (f1) IN (SELECT f1 FROM t2)
LIMIT 0;

set @@optimizer_switch='default';
drop table t1, t2;

--echo #
--echo # LP BUG#834492: Crash in fix_semijoin_strategies_for_picked_join_order
--echo # with nested subqueries and LooseScan=ON
--echo #

CREATE TABLE t3 (b int) ;
INSERT INTO t3 VALUES (0),(0);

CREATE TABLE t4 (a int, b int, c int, d int, PRIMARY KEY (a)) ;
INSERT INTO t4 VALUES (28,0,0,0),(29,3,0,0);

CREATE TABLE t5 (a int, b int, c int, d int, KEY (c,b)) ;
INSERT INTO t5 VALUES (28,0,0,0),(29,3,0,0);

SET @@optimizer_switch='semijoin=ON,loosescan=ON,firstmatch=OFF,materialization=OFF';

EXPLAIN SELECT *
FROM t3
WHERE t3.b > ALL (
        SELECT c
        FROM t4
        WHERE t4.a >= t3.b
        AND a = SOME (SELECT b FROM t5));

SELECT *
FROM t3
WHERE t3.b > ALL (
        SELECT c
        FROM t4
        WHERE t4.a >= t3.b
        AND a = SOME (SELECT b FROM t5));

set @@optimizer_switch='default';
drop table t3, t4, t5;

--echo #
--echo # LP BUG#858038 The result of a query with NOT IN subquery depends on the state of the optimizer switch
--echo #

set @optimizer_switch_save= @@optimizer_switch;

create table t1 (c1 char(2) not null, c2 char(2));
create table t2 (c3 char(2),          c4 char(2));

insert into t1 values ('a1', 'b1');
insert into t1 values ('a2', 'b2');

insert into t2 values ('x1', 'y1');
insert into t2 values ('a2', null);

set @@optimizer_switch='in_to_exists=off,materialization=on,partial_match_rowid_merge=off,partial_match_table_scan=on';
explain select * from t1 where c1 = 'a2' and (c1, c2) not in (select * from t2);
select * from t1 where c1 = 'a2' and (c1, c2) not in (select * from t2);

set @@optimizer_switch='in_to_exists=off,materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off';
explain select * from t1 where c1 = 'a2' and (c1, c2) not in (select * from t2);
select * from t1 where c1 = 'a2' and (c1, c2) not in (select * from t2);

drop table t1, t2;

set optimizer_switch= @optimizer_switch_save;

--echo #
--echo # MDEV-12673: cost-based choice between materialization and in-to-exists
--echo #

CREATE TABLE t1 (
 pk1 int, a1 varchar(3), b1 varchar(3), PRIMARY KEY (pk1), KEY(a1), KEY(b1)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1,'foo','bar'),(2,'bar','foo');

CREATE TABLE t2 (pk2 INT PRIMARY KEY, a2 VARCHAR(3), KEY(a2)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (1,'abc'),(2,'xyz'),(3,'foo');

SELECT 'qux' IN ( SELECT a1 FROM t1 INNER JOIN t2 WHERE a2 = b1 AND pk2 = 3 );
SELECT 'bar' IN ( SELECT a1 FROM t1 INNER JOIN t2 WHERE a2 = b1 AND pk2 = 3 );
EXPLAIN
SELECT 'bar' IN ( SELECT a1 FROM t1 INNER JOIN t2 WHERE a2 = b1 AND pk2 = 3 );

DROP TABLE t1,t2;

CREATE TABLE t1 (i1 INT) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1);

CREATE TABLE t2 (i2 int, c2 varchar(3), KEY(i2,c2)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (1,'abc'),(2,'foo');

CREATE TABLE t3 (pk3 int PRIMARY KEY, c3 varchar(3)) ENGINE=MyISAM;
INSERT INTO t3 VALUES (1,'foo'),(2,'bar');

SELECT * FROM t1 WHERE i1 NOT IN (
  SELECT i2 FROM t2 RIGHT JOIN t3 ON (c3 = c2) WHERE pk3 = i1
);

EXPLAIN
SELECT * FROM t1 WHERE i1 NOT IN (
  SELECT i2 FROM t2 RIGHT JOIN t3 ON (c3 = c2) WHERE pk3 = i1
);

DROP TABLE t1,t2,t3;

--echo #
--echo # MDEV-7599: in-to-exists chosen after min/max optimization
--echo #

set @optimizer_switch_save= @@optimizer_switch;

CREATE TABLE t1 (a INT, KEY(a)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1),(2);

CREATE TABLE t2 (b INT, c INT) ENGINE=MyISAM;
INSERT INTO t2 VALUES (1,6),(2,4), (8,9);

let $q=
SELECT * FROM t2 WHERE b != ALL (SELECT MIN(a) FROM t1, t2 WHERE t2.c = t2.b);

eval $q;
eval EXPLAIN EXTENDED $q;
set optimizer_switch= 'materialization=off';
eval $q;
eval EXPLAIN EXTENDED $q;
set optimizer_switch= @optimizer_switch_save;

DROP TABLE t1,t2;

CREATE TABLE t1 (f1 varchar(10)) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('foo'),('bar');

CREATE TABLE t2 (f2 varchar(10), key(f2)) ENGINE=MyISAM;
INSERT INTO t2 VALUES ('baz'),('qux');

CREATE TABLE t3 (f3 varchar(10)) ENGINE=MyISAM;
INSERT INTO t3 VALUES ('abc'),('def');

SELECT * FROM t1
  WHERE f1 = ALL( SELECT MAX(t2a.f2)
                  FROM t2 AS t2a INNER JOIN t2 t2b INNER JOIN t3
                  ON (f3 = t2b.f2) );

DROP TABLE t1,t2,t3;

--echo #
--echo # MDEV-12963: min/max optimization optimizing away all tables employed
--echo #             for uncorrelated IN subquery used in a disjunct of WHERE
--echo #

create table t1 (a int, index idx(a)) engine=myisam;
insert into t1 values (4),(7),(1),(3),(9);

select * from t1 where a in (select max(a) from t1 where a < 4) or a > 5;
explain
select * from t1 where a in (select max(a) from t1 where a < 4) or a > 5;

drop table t1;

--echo #
--echo # MDEV-13135: subquery with ON expression subject to
--echo #             semi-join optimizations
--echo #

CREATE TABLE t1 (a INT);
CREATE ALGORITHM=MERGE VIEW v1 AS SELECT a AS v_a FROM t1;
INSERT INTO t1 VALUES (1),(3);

CREATE TABLE t2 (b INT, KEY(b));
INSERT INTO t2 VALUES (3),(4);

SELECT * FROM t1 WHERE a NOT IN (
  SELECT b FROM t2 INNER JOIN v1 ON (b IN ( SELECT a FROM t1 ))
    WHERE v_a = b
);

DROP VIEW v1;
DROP TABLE t1,t2;