mariadb/mysql-test/t/subselect_sj.test

#
# Nested Loops semi-join subquery evaluation tests
#
--disable_warnings
drop table if exists t0, t1, t2, t10, t11, t12;
--enable_warnings

#
# 1. Subqueries that are converted into semi-joins
#
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

create table t1(a int, b int);
insert into t1 values (0,0),(1,1),(2,2);
create table t2 as select * from t1;

create table t11(a int, b int);

create table t10 (pk int, a int, primary key(pk));
insert into t10 select a,a from t0;
create table t12 like t10;
insert into t12 select * from t10;


--echo Flattened because of dependency, t10=func(t1)
explain select * from t1 where a in (select pk from t10);
select * from t1 where a in (select pk from t10);

--echo A confluent case of dependency
explain select * from t1 where a in (select a from t10 where pk=12);
select * from t1 where a in (select a from t10 where pk=12);

explain select * from t1 where a in (select a from t10 where pk=9);
select * from t1 where a in (select a from t10 where pk=9);

--echo An empty table inside
explain select * from t1 where a in (select a from t11);
select * from t1 where a in (select a from t11);

explain select * from t1 where a in (select pk from t10) and b in (select pk from t10);
select * from t1 where a in (select pk from t10) and b in (select pk from t10);

--echo flattening a nested subquery
explain select * from t1 where a in (select pk from t10 where t10.a in (select pk from t12));
select * from t1 where a in (select pk from t10 where t10.a in (select pk from t12));

--echo flattening subquery w/ several tables
explain extended select * from t1 where a in (select t10.pk from t10, t12 where t12.pk=t10.a);

--echo subqueries within outer joins go into ON expr.
# TODO: psergey: check if case conversions like those are ok (it broke on  windows)
--replace_result a A b B
explain extended
select * from t1 left join (t2 A, t2 B) on ( A.a= t1.a and B.a in (select pk from t10));

# TODO: psergey: check if case conversions like those are ok (it broke on  windows)
--echo t2 should be wrapped into OJ-nest, so we have "t1 LJ (t2 J t10)"
--replace_result a A b B
explain extended
select * from t1 left join t2 on (t2.a= t1.a and t2.a in (select pk from t10));

--echo we shouldn't flatten if we're going to get a join of > MAX_TABLES.
explain select * from 
  t1 s00, t1 s01,  t1 s02, t1 s03, t1 s04,t1 s05,t1 s06,t1 s07,t1 s08,t1 s09,
  t1 s10, t1 s11,  t1 s12, t1 s13, t1 s14,t1 s15,t1 s16,t1 s17,t1 s18,t1 s19,
  t1 s20, t1 s21,  t1 s22, t1 s23, t1 s24,t1 s25,t1 s26,t1 s27,t1 s28,t1 s29,
  t1 s30, t1 s31,  t1 s32, t1 s33, t1 s34,t1 s35,t1 s36,t1 s37,t1 s38,t1 s39,
  t1 s40, t1 s41,  t1 s42, t1 s43, t1 s44,t1 s45,t1 s46,t1 s47,t1 s48,t1 s49
where
  s00.a in (
  select m00.a from
    t1 m00, t1 m01,  t1 m02, t1 m03, t1 m04,t1 m05,t1 m06,t1 m07,t1 m08,t1 m09,
    t1 m10, t1 m11,  t1 m12, t1 m13, t1 m14,t1 m15,t1 m16,t1 m17,t1 m18,t1 m19
  );

select * from
  t1 left join t2 on (t2.a= t1.a and t2.a in (select pk from t10)) 
where t1.a < 5;

# 
# Prepared statements
#
prepare s1 from
  ' select * from
    t1 left join t2 on (t2.a= t1.a and t2.a in (select pk from t10))
  where t1.a < 5';
execute s1;
execute s1;

# Try I2O orders
insert into t1 select (A.a + 10 * B.a),1 from t0 A, t0 B;
explain extended select * from t1 where a in (select pk from t10 where pk<3);

--echo
--echo BUG#37120 optimizer_switch allowable values not according to specification
--echo

select @@optimizer_switch; 

set optimizer_switch='default,materialization=off';
select @@optimizer_switch; 

set optimizer_switch='default,semijoin=off';
select @@optimizer_switch; 

set optimizer_switch='default,loosescan=off';
select @@optimizer_switch; 

set optimizer_switch='default,semijoin=off,materialization=off';
select @@optimizer_switch; 

set optimizer_switch='default,materialization=off,semijoin=off';
select @@optimizer_switch; 

set optimizer_switch='default,semijoin=off,materialization=off,loosescan=off';
select @@optimizer_switch; 

set optimizer_switch='default,semijoin=off,loosescan=off';
select @@optimizer_switch; 

set optimizer_switch='default,materialization=off,loosescan=off';
select @@optimizer_switch; 
set optimizer_switch=default;

drop table t0, t1, t2;
drop table t10, t11, t12;

--echo
--echo Bug#37899: Wrongly checked optimization prerequisite caused failed
--echo            assertion.
--echo
CREATE TABLE t1 (
  `pk` int(11),
  `varchar_nokey` varchar(5)
);

INSERT INTO t1 VALUES
(1,'qk'),(2,'j'),(3,'aew');

SELECT *
FROM t1
WHERE varchar_nokey IN (
 SELECT
 varchar_nokey
 FROM
 t1
) XOR pk = 30;
drop table t1;

--echo #
--echo # BUG#41842: Semi-join materialization strategy crashes when the upper query has HAVING
--echo #

CREATE TABLE t1 (
  pk int(11) NOT NULL AUTO_INCREMENT,
  int_nokey int(11) NOT NULL,
  time_key time NOT NULL,
  datetime_key datetime NOT NULL,
  datetime_nokey datetime NOT NULL,
  varchar_key varchar(1) NOT NULL,
  varchar_nokey varchar(1) NOT NULL,
  PRIMARY KEY (pk),
  KEY time_key (time_key),
  KEY datetime_key (datetime_key),
  KEY varchar_key (varchar_key)
);
INSERT INTO t1 VALUES 
(1,0, '00:16:10','2008-09-03 14:25:40','2008-09-03 14:25:40','h','h'),
(2,7, '00:00:00','2001-01-13 00:00:00','2001-01-13 00:00:00','',''),
(3,0, '00:00:00','0000-00-00 00:00:00','0000-00-00 00:00:00','x','x'),
(4,2, '16:29:24','2000-10-16 01:39:08','2000-10-16 01:39:08','w','w'),
(5,1, '09:23:32','0000-00-00 00:00:00','0000-00-00 00:00:00','p','p'),
(6,3, '00:00:00','2007-12-02 00:00:00','2007-12-02 00:00:00','o','o'),
(7,3, '00:00:00','2008-09-11 00:00:00','2008-09-11 00:00:00','',''),
(8,0, '13:59:04','0000-00-00 00:00:00','0000-00-00 00:00:00','s','s'),
(9,7, '09:01:06','0000-00-00 00:00:00','0000-00-00 00:00:00','d','d'),
(10,5,'00:00:00','0000-00-00 00:00:00','0000-00-00 00:00:00','n','n'),
(11,0,'21:06:46','0000-00-00 00:00:00','0000-00-00 00:00:00','o','o'),
(12,2,'00:00:00','0000-00-00 00:00:00','0000-00-00 00:00:00','',''),
(13,6,'14:45:34','2003-07-28 02:34:08','2003-07-28 02:34:08','w','w'),
(14,1,'15:04:12','0000-00-00 00:00:00','0000-00-00 00:00:00','o','o'),
(15,0,'00:00:00','0000-00-00 00:00:00','0000-00-00 00:00:00','x','x'),
(16,0,'15:55:23','2004-03-17 00:32:27','2004-03-17 00:32:27','p','p'),
(17,1,'16:30:00','2004-12-27 19:20:00','2004-12-27 19:20:00','d','d'),
(18,0,'00:00:00','0000-00-00 00:00:00','0000-00-00 00:00:00','h','h'),
(19,0,'14:13:26','2008-11-09 05:53:48','2008-11-09 05:53:48','o','o'),
(20,0,'00:00:00','2009-10-11 06:58:04','2009-10-11 06:58:04','k','k');

CREATE TABLE t2 (
  pk int(11) NOT NULL AUTO_INCREMENT,
  int_nokey int(11) NOT NULL,
  time_key time NOT NULL,
  datetime_key datetime NOT NULL,
  datetime_nokey datetime NOT NULL,
  varchar_key varchar(1) NOT NULL,
  varchar_nokey varchar(1) NOT NULL,
  PRIMARY KEY (pk),
  KEY time_key (time_key),
  KEY datetime_key (datetime_key),
  KEY varchar_key (varchar_key)
);
INSERT INTO t2 VALUES 
(10,0,'19:39:13','0000-00-00 00:00:00','0000-00-00 00:00:00','g','g'),
(11,8,'03:43:53','0000-00-00 00:00:00','0000-00-00 00:00:00','b','b');
SELECT OUTR.datetime_nokey AS X FROM t1 AS OUTR 
WHERE 
  OUTR.varchar_nokey IN (SELECT 
                             INNR . varchar_nokey AS Y 
                             FROM t2 AS INNR 
                             WHERE
                               INNR . datetime_key >= INNR . time_key OR 
                               INNR . pk = INNR . int_nokey  
                             ) 
  AND OUTR . varchar_nokey <= 'w' 
HAVING X > '2012-12-12';
drop table t1, t2;

--echo #
--echo # Bug#45191: Incorrectly initialized semi-join led to a wrong result.
--echo #
CREATE TABLE STAFF (EMPNUM   CHAR(3) NOT NULL,
    EMPNAME  CHAR(20), GRADE DECIMAL(4), CITY CHAR(15));

CREATE TABLE PROJ (PNUM CHAR(3) NOT NULL,
    PNAME    CHAR(20), PTYPE CHAR(6),
    BUDGET   DECIMAL(9),
    CITY     CHAR(15));

CREATE TABLE WORKS (EMPNUM CHAR(3) NOT NULL,
    PNUM CHAR(3) NOT NULL, HOURS DECIMAL(5));
INSERT INTO STAFF VALUES ('E1','Alice',12,'Deale');
INSERT INTO STAFF VALUES ('E2','Betty',10,'Vienna');
INSERT INTO STAFF VALUES ('E3','Carmen',13,'Vienna');
INSERT INTO STAFF VALUES ('E4','Don',12,'Deale');
INSERT INTO STAFF VALUES ('E5','Ed',13,'Akron');

INSERT INTO PROJ VALUES  ('P1','MXSS','Design',10000,'Deale');
INSERT INTO PROJ VALUES  ('P2','CALM','Code',30000,'Vienna');
INSERT INTO PROJ VALUES  ('P3','SDP','Test',30000,'Tampa');
INSERT INTO PROJ VALUES  ('P4','SDP','Design',20000,'Deale');
INSERT INTO PROJ VALUES  ('P5','IRM','Test',10000,'Vienna');
INSERT INTO PROJ VALUES  ('P6','PAYR','Design',50000,'Deale');

INSERT INTO WORKS VALUES  ('E1','P1',40);
INSERT INTO WORKS VALUES  ('E1','P2',20);
INSERT INTO WORKS VALUES  ('E1','P3',80);
INSERT INTO WORKS VALUES  ('E1','P4',20);
INSERT INTO WORKS VALUES  ('E1','P5',12);
INSERT INTO WORKS VALUES  ('E1','P6',12);
INSERT INTO WORKS VALUES  ('E2','P1',40);
INSERT INTO WORKS VALUES  ('E2','P2',80);
INSERT INTO WORKS VALUES  ('E3','P2',20);
INSERT INTO WORKS VALUES  ('E4','P2',20);
INSERT INTO WORKS VALUES  ('E4','P4',40);
INSERT INTO WORKS VALUES  ('E4','P5',80);

set optimizer_switch='default,materialization=off';

explain SELECT EMPNUM, EMPNAME
FROM STAFF
WHERE EMPNUM IN
  (SELECT EMPNUM  FROM WORKS
   WHERE PNUM IN
     (SELECT PNUM  FROM PROJ));

SELECT EMPNUM, EMPNAME
FROM STAFF
WHERE EMPNUM IN
  (SELECT EMPNUM  FROM WORKS
   WHERE PNUM IN
     (SELECT PNUM  FROM PROJ));

set optimizer_switch='default';

drop table STAFF,WORKS,PROJ;

--echo # End of bug#45191

--echo #
--echo # Bug#46550 Azalea returning duplicate results for some IN subqueries
--echo # w/ semijoin=on
--echo #

--disable_warnings
DROP TABLE IF EXISTS t0, t1, t2;
--enable_warnings

CREATE TABLE t0 (
  int_key int(11) DEFAULT NULL,
  varchar_key varchar(1) DEFAULT NULL,
  varchar_nokey varchar(1) DEFAULT NULL,
  KEY int_key (int_key),
  KEY varchar_key (varchar_key,int_key)
);

INSERT INTO t0 VALUES
(1,'m','m'),
(40,'h','h'),
(1,'r','r'),
(1,'h','h'),
(9,'x','x'),
(NULL,'q','q'),
(NULL,'k','k'),
(7,'l','l'),
(182,'k','k'),
(202,'a','a'),
(7,'x','x'),
(6,'j','j'),
(119,'z','z'),
(4,'d','d'),
(5,'h','h'),
(1,'u','u'),
(3,'q','q'),
(7,'a','a'),
(3,'e','e'),
(6,'l','l');

CREATE TABLE t1 (
  int_key int(11) DEFAULT NULL,
  varchar_key varchar(1) DEFAULT NULL,
  varchar_nokey varchar(1) DEFAULT NULL,
  KEY int_key (int_key),
  KEY varchar_key (varchar_key,int_key)
);
INSERT INTO t1 VALUES (7,NULL,NULL),(4,'x','x');

CREATE TABLE t2 (
  int_key int(11) DEFAULT NULL,
  varchar_key varchar(1) DEFAULT NULL,
  varchar_nokey varchar(1) DEFAULT NULL,
  KEY int_key (int_key),
  KEY varchar_key (varchar_key,int_key)
);
INSERT INTO t2 VALUES (123,NULL,NULL);

SELECT int_key  
FROM t0  
WHERE varchar_nokey  IN (  
  SELECT t1 .varchar_key  from t1
);

SELECT t0.int_key  
FROM t0
WHERE t0.varchar_nokey  IN (  
  SELECT t1_1 .varchar_key  
  FROM t1 AS t1_1  JOIN t1 AS t1_2 ON t1_1 .int_key
);

SELECT t0.int_key  
FROM t0, t2
WHERE t0.varchar_nokey  IN (  
  SELECT t1_1 .varchar_key  
  FROM t1 AS t1_1  JOIN t1 AS t1_2 ON t1_1 .int_key  
);

DROP TABLE t0, t1, t2;

--echo # End of bug#46550

--echo #
--echo # Bug #46744 Crash in optimize_semijoin_nests on empty view
--echo # with limit and procedure.
--echo #

--disable_warnings
DROP TABLE IF EXISTS t1, t2;
DROP VIEW IF EXISTS v1;
DROP PROCEDURE IF EXISTS p1;
--enable_warnings

CREATE TABLE t1 ( f1 int );
CREATE TABLE t2 ( f1 int );

insert into t2 values (5), (7);

CREATE OR REPLACE VIEW v1 AS SELECT * FROM t1 LIMIT 2;

create procedure p1() 
select COUNT(*) 
FROM v1 WHERE f1 IN 
(SELECT f1 FROM t2 WHERE f1 = ANY (SELECT f1 FROM v1));

SET SESSION optimizer_switch = 'semijoin=on';
CALL p1();
SET SESSION optimizer_switch = 'semijoin=off';
CALL p1();

drop table t1, t2;
drop view v1;
drop procedure p1;

set SESSION optimizer_switch='default';

--echo # End of bug#46744

--echo
--echo Bug#46797 "Crash in fix_semijoin_strategies_for_picked_join_order 
--echo with semijoin=on"
--echo
CREATE TABLE t1 (
  varchar_key varchar(1) DEFAULT NULL,
  KEY varchar_key (varchar_key)
);

CREATE TABLE t2 (
  varchar_key varchar(1) DEFAULT NULL,
  KEY varchar_key (varchar_key)
);
INSERT INTO t2 VALUES
  (NULL),(NULL),(NULL),(NULL),('a'),('a'),('a'),('b'),('b'),('b'),('b'),('c'),
  ('c'),('c'),('c'),('c'),('c'),('c'),('d'),('d'),('d'),('d'),('d'),('d'),('e'),
  ('e'),('e'),('e'),('e'),('e'),('f'),('f'),('f'),('g'),('g'),('h'),('h'),('h'),
  ('h'),('i'),('j'),('j'),('j'),('k'),('k'),('l'),('l'),('m'),('m'),('m'),('m'),
  ('n'),('n'),('n'),('o'),('o'),('o'),('p'),('p'),('p'),('q'),('q'),('q'),('r'),
  ('r'),('r'),('r'),('s'),('s'),('s'),('s'),('t'),('t'),('t'),('t'),('u'),('u'),
  ('u'),('u'),('v'),('v'),('v'),('v'),('w'),('w'),('w'),('w'),('w'),('w'),('x'),
  ('x'),('x'),('y'),('y'),('y'),('y'),('z'),('z'),('z'),('z');

CREATE TABLE t3 (
  varchar_key varchar(1) DEFAULT NULL,
  KEY varchar_key (varchar_key)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
INSERT INTO t3 VALUES
  (NULL),('c'),('d'),('e'),('f'),('h'),('j'),('k'),('k'),('m'),('m'),('m'),
  ('n'),('o'),('r'),('t'),('t'),('u'),('w'),('y');
 
SELECT varchar_key FROM t3 
WHERE (SELECT varchar_key FROM t3 
       WHERE (varchar_key,varchar_key) 
         IN (SELECT t1.varchar_key, t2 .varchar_key 
             FROM t1 RIGHT JOIN t2 ON t1.varchar_key  
            )  
      );

DROP TABLE t1, t2, t3;


--echo #
--echo # Bug#46556 Returning incorrect, empty results for some IN subqueries 
--echo #           w/semijoin=on
--echo #

CREATE TABLE t0 (
  pk INTEGER,
  vkey VARCHAR(1),
  vnokey VARCHAR(1),
  PRIMARY KEY (pk),
  KEY vkey(vkey)
);

INSERT INTO t0 
VALUES (1,'g','g'), (2,'v','v'), (3,'t','t'), (4,'u','u'), (5,'n','n');

EXPLAIN EXTENDED SELECT vkey FROM t0 WHERE pk IN 
  (SELECT t1.pk FROM t0 t1 JOIN t0 t2 ON t2.vkey = t1.vnokey);

SELECT vkey FROM t0 WHERE pk IN 
  (SELECT t1.pk FROM t0 t1 JOIN t0 t2 ON t2.vkey = t1.vnokey);

DROP TABLE t0;

--echo # End of bug#46556

--echo
--echo Bug #48073 Subquery on char columns from view crashes Mysql
--echo

--disable_warnings
DROP TABLE IF EXISTS t1, t2;
DROP VIEW IF EXISTS v1;
--enable_warnings

CREATE TABLE t1 (
  city VARCHAR(50) NOT NULL,
  country_id SMALLINT UNSIGNED NOT NULL
);

INSERT INTO t1 VALUES 
('Batna',2),
('Bchar',2),
('Skikda',2),
('Tafuna',3),
('Algeria',2) ;

CREATE TABLE t2 (
  country_id SMALLINT UNSIGNED NOT NULL,
  country VARCHAR(50) NOT NULL
);

INSERT INTO t2 VALUES
(2,'Algeria'),
(3,'American Samoa') ;

CREATE VIEW v1 AS 
SELECT country_id, country 
FROM t2
WHERE LEFT(country,1) = "A" 
; 

SELECT city, country_id
FROM t1
WHERE city IN (
  SELECT country 
  FROM t2
  WHERE LEFT(country, 1) = "A" 
);

SELECT city, country_id
FROM t1
WHERE city IN (
  SELECT country 
  FROM v1
);

drop table t1, t2;
drop view v1;

--echo # End of bug#48073

--echo
--echo Bug#48834: Procedure with view + subquery + semijoin=on 
--echo            crashes on second call.
--echo

SET SESSION optimizer_switch ='semijoin=on';

CREATE TABLE t1 ( t1field integer, primary key (t1field));
CREATE TABLE t2 ( t2field integer, primary key (t2field));

CREATE VIEW v1 AS 
  SELECT t1field as v1field
  FROM t1 A 
  WHERE A.t1field IN (SELECT t1field FROM t2 );

CREATE VIEW v2 AS 
  SELECT t2field as v2field
  FROM t2 A 
  WHERE A.t2field IN (SELECT t2field FROM t2 );

DELIMITER |;
CREATE PROCEDURE p1 () 
  BEGIN 
    SELECT v1field
    FROM v1 
    WHERE v1field IN ( SELECT v2field as vf_inner FROM v2 );
  END|
DELIMITER ;|

INSERT INTO t1 VALUES (1),(2),(3);
INSERT INTO t2 VALUES (2),(3),(4);

CALL p1;
CALL p1;

DROP TABLE t1,t2;
DROP VIEW v1,v2;
DROP PROCEDURE p1;

set SESSION optimizer_switch='default';

--echo # End of BUG#48834

--echo
--echo Bug#49097 subquery with view generates wrong result with
--echo           non-prepared statement
--echo

--disable_warnings
DROP TABLE IF EXISTS t1, t2;
DROP VIEW IF EXISTS v1;
--enable_warnings

CREATE TABLE t1 (
  city VARCHAR(50) NOT NULL,
  country_id SMALLINT UNSIGNED NOT NULL
);

INSERT INTO t1 VALUES 
('Batna',2),
('Bchar',2),
('Skikda',2),
('Tafuna',3),
('Algeria',2) ;

CREATE TABLE t2 (
  country_id SMALLINT UNSIGNED NOT NULL,
  country VARCHAR(50) NOT NULL
);

INSERT INTO t2 VALUES
(2,'Algeria'),
(3,'XAmerican Samoa') ;

CREATE VIEW v1 AS 
SELECT country_id, country 
FROM t2
WHERE LEFT(country,1) = "A" 
; 

SELECT city, country_id
FROM t1
WHERE country_id IN (
  SELECT country_id 
  FROM t2
  WHERE LEFT(country,1) = "A" 
);

SELECT city, country_id
FROM t1
WHERE country_id IN (
  SELECT country_id 
  FROM v1
);

PREPARE stmt FROM
"
SELECT city, country_id
FROM t1
WHERE country_id IN (
  SELECT country_id 
  FROM v1
);
";

execute stmt;

deallocate prepare stmt;
drop table t1, t2;
drop view v1;

--echo # End of Bug#49097

--echo # 
--echo # BUG#38075: Wrong result: rows matching a subquery with outer join not returned
--echo # 

--disable_warnings
DROP TABLE IF EXISTS ot1, it1, it2;
--enable_warnings

CREATE TABLE it2 (
  int_key int(11) NOT NULL,
  datetime_key datetime NOT NULL,
  KEY int_key (int_key),
  KEY datetime_key (datetime_key)
);
INSERT INTO it2 VALUES
  (5,'2002-04-10 14:25:30'), (0,'0000-00-00 00:00:00'),
  (0,'2006-09-14 04:01:02'), (4,'0000-00-00 00:00:00'),
  (8,'0000-00-00 00:00:00'), (5,'0000-00-00 00:00:00'),
  (9,'0000-00-00 00:00:00'), (8,'2007-04-01 11:04:17'),
  (1,'0000-00-00 00:00:00'), (7,'2009-01-12 00:00:00'),
  (0,'2009-06-05 00:00:00'), (3,'2006-02-14 18:06:35'),
  (5,'2006-02-21 07:08:16'), (0,'0000-00-00 00:00:00'),
  (7,'0000-00-00 00:00:00'), (0,'0000-00-00 00:00:00'),
  (0,'2007-02-13 00:00:00'), (1,'0000-00-00 00:00:00'),
  (0,'0000-00-00 00:00:00'), (1,'2003-08-11 00:00:00');
CREATE TABLE ot1 (
  int_nokey int(11) NOT NULL,
  int_key int(11) NOT NULL,
  KEY int_key (int_key)
);
INSERT INTO ot1 VALUES
  (5,0), (3,0), (0,2), (3,0), (1,3), (0,0), (1,7), (7,0), (1,7), (0,7),
  (0,9), (8,2), (4,4), (9,3), (0,9), (2,5), (0,5), (8,0), (5,8), (1,5);
CREATE TABLE it1 (
  int_nokey int(11) NOT NULL,
  int_key int(11) NOT NULL,
  KEY int_key (int_key)
);
INSERT INTO it1 VALUES
  (9,5), (0,4);
SELECT int_key FROM ot1
WHERE int_nokey IN (SELECT it2.int_key
                    FROM it1 LEFT JOIN it2 ON it2.datetime_key);
EXPLAIN
SELECT int_key FROM ot1
WHERE int_nokey IN (SELECT it2.int_key
                    FROM it1 LEFT JOIN it2 ON it2.datetime_key);
DROP TABLE ot1, it1, it2;

--echo # End of BUG#38075