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Fixed the bug mdev-12429 and its duplicates mdev-12145 and mdev-9886.

Also fixed a wrong result for a test case for mdev-7691
(the alternative one).
The test  cases for all these bug have materialized semi-joins used
inside dependent sub-queries.

The patch actually reverts the change inroduced by Monty in 2003.
It looks like this change is not valid anymore after the implementation
of semi-joins.
Adjusted output from EXPLAIN for many other test cases.
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igorbabaev committed Apr 4, 2017
1 parent a821ef7 commit b0395d8701ec49f49ad23f9917a3b2369bb49e7a
@@ -1,5 +1,5 @@
--- r/innodb_icp.result 2013-07-16 17:01:00.000000000 +0400
+++ r/innodb_icp,innodb_plugin.reject 2013-07-16 17:16:53.000000000 +0400
--- innodb_icp.result 2017-04-02 23:39:45.063149325 -0700
+++ innodb_icp,innodb_plugin.result 2017-04-02 23:36:33.279164925 -0700
@@ -213,7 +213,7 @@
EXPLAIN
SELECT c1 FROM t3 WHERE c1 >= 'c-1004=w' and c1 <= 'c-1006=w' and i1 > 2;
@@ -432,7 +432,7 @@ WHERE pk IN (SELECT it.pk FROM t2 JOIN t2 AS it ON it.i=it.i WHERE it.pk-t1.i<10
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
2 DEPENDENT SUBQUERY it eq_ref PRIMARY PRIMARY 4 func 1 Using where
2 DEPENDENT SUBQUERY t2 index NULL PRIMARY 4 NULL 3 Using where; Using index; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY t2 index NULL PRIMARY 4 NULL 3 Using index; Using join buffer (flat, BNL join)
SELECT * FROM t1
WHERE pk IN (SELECT it.pk FROM t2 JOIN t2 AS it ON it.i=it.i WHERE it.pk-t1.i<10);
pk i
@@ -1744,7 +1744,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index PRIMARY PRIMARY 4 NULL 2 100.00 Using where; Using index; Using temporary; Using filesort
1 PRIMARY t2 eq_ref PRIMARY PRIMARY 4 func 1 100.00 Using where; Using index
2 DEPENDENT SUBQUERY t3 eq_ref PRIMARY PRIMARY 4 func 1 100.00 Using where; Using index
2 DEPENDENT SUBQUERY t4 eq_ref PRIMARY PRIMARY 4 test.t3.pk 1 100.00 Using where; Using index
2 DEPENDENT SUBQUERY t4 eq_ref PRIMARY PRIMARY 4 test.t3.pk 1 100.00 Using index
Warnings:
Note 1276 Field or reference 'test.t2.pk' of SELECT #2 was resolved in SELECT #1
Note 1003 select `test`.`t2`.`pk` AS `pk`,<expr_cache><`test`.`t2`.`pk`>((select (`test`.`t3`.`pk` + if(isnull(`test`.`t4`.`pk`),0,`test`.`t4`.`pk`)) from `test`.`t3` left join `test`.`t4` on((`test`.`t4`.`pk` = `test`.`t3`.`pk`)) where (`test`.`t3`.`pk` = (`test`.`t2`.`pk` + 1000)) limit 1)) AS `t` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`pk` = (`test`.`t1`.`pk` + 1000)) and (`test`.`t1`.`pk` > 1000)) group by `test`.`t2`.`pk`
@@ -1755,7 +1755,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index PRIMARY PRIMARY 4 NULL 2 100.00 Using where; Using index; Using temporary; Using filesort
1 PRIMARY t2 eq_ref PRIMARY PRIMARY 4 func 1 100.00 Using where; Using index
2 DEPENDENT SUBQUERY t3 eq_ref PRIMARY PRIMARY 4 func 1 100.00 Using where; Using index
2 DEPENDENT SUBQUERY t4 eq_ref PRIMARY PRIMARY 4 test.t3.pk 1 100.00 Using where; Using index
2 DEPENDENT SUBQUERY t4 eq_ref PRIMARY PRIMARY 4 test.t3.pk 1 100.00 Using index
Warnings:
Note 1276 Field or reference 'test.t2.pk' of SELECT #2 was resolved in SELECT #1
Note 1003 select `test`.`t2`.`pk` AS `pk`,<expr_cache><`test`.`t2`.`pk`>((select (`test`.`t3`.`pk` + if(isnull(`test`.`t4`.`pk`),0,`test`.`t4`.`pk`)) from `test`.`t3` left join `test`.`t4` on((`test`.`t4`.`pk` = `test`.`t3`.`pk`)) where (`test`.`t3`.`pk` = (`test`.`t2`.`pk` + 1000)) limit 1)) AS `t` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`pk` = (`test`.`t1`.`pk` + 1000)) and (`test`.`t1`.`pk` > 1000)) group by `test`.`t2`.`pk`
@@ -436,7 +436,7 @@ WHERE pk IN (SELECT it.pk FROM t2 JOIN t2 AS it ON it.i=it.i WHERE it.pk-t1.i<10
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
2 DEPENDENT SUBQUERY it eq_ref PRIMARY PRIMARY 4 func 1 Using index condition
2 DEPENDENT SUBQUERY t2 index NULL PRIMARY 4 NULL 3 Using where; Using index; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY t2 index NULL PRIMARY 4 NULL 3 Using index; Using join buffer (flat, BNL join)
SELECT * FROM t1
WHERE pk IN (SELECT it.pk FROM t2 JOIN t2 AS it ON it.i=it.i WHERE it.pk-t1.i<10);
pk i
@@ -797,7 +797,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t ALL PRIMARY,c NULL NULL NULL 64 Using where
1 PRIMARY t2 ref g g 5 test.t.c 19 Using where
2 DEPENDENT SUBQUERY t1 index PRIMARY PRIMARY 4 NULL 64 Using where; Using index
2 DEPENDENT SUBQUERY t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using index condition; Using where
2 DEPENDENT SUBQUERY t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where
SELECT COUNT(*) FROM t1 AS t, t2
WHERE c = g
AND (EXISTS (SELECT * FROM t1, t2 WHERE a = f AND h <= t.e AND a > t.b)
@@ -266,7 +266,7 @@ from t2;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00
2 DEPENDENT SUBQUERY t1 ref_or_null a a 5 func 2 100.00 Using where; Full scan on NULL key
2 DEPENDENT SUBQUERY t4 ALL NULL NULL NULL NULL 100 100.00 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY t4 ALL NULL NULL NULL NULL 100 100.00 Using join buffer (flat, BNL join)
Warnings:
Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`oref` AS `oref`,<expr_cache><`test`.`t2`.`a`,`test`.`t2`.`b`,`test`.`t2`.`oref`>(<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(select `test`.`t1`.`a`,`test`.`t1`.`b` from `test`.`t1` join `test`.`t4` where ((`test`.`t1`.`c` = `test`.`t2`.`oref`) and trigcond(((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`))) and trigcond(((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`b`) or isnull(`test`.`t1`.`b`)))) having (trigcond(<is_not_null_test>(`test`.`t1`.`a`)) and trigcond(<is_not_null_test>(`test`.`t1`.`b`)))))) AS `Z` from `test`.`t2`
@@ -1240,19 +1240,19 @@ explain select * from t2 where a in (select straight_join A.a from t1 A, t1 B);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 10 Using where
2 DEPENDENT SUBQUERY A ALL NULL NULL NULL NULL 10 Using where
2 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 10 Using join buffer (flat, BNL join)
explain select * from t2 where a in (select straight_join A.a from t1 A, t1 B);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 10 Using where
2 DEPENDENT SUBQUERY A ALL NULL NULL NULL NULL 10 Using where
2 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 10 Using join buffer (flat, BNL join)
explain select straight_join * from t2 X, t2 Y
where X.a in (select straight_join A.a from t1 A, t1 B);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY X ALL NULL NULL NULL NULL 10 Using where
1 PRIMARY Y ALL NULL NULL NULL NULL 10 Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY A ALL NULL NULL NULL NULL 10 Using where
2 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 10 Using join buffer (flat, BNL join)
create table t0 (a int, b int);
insert into t0 values(1,1);
explain select * from t0, t3 where t3.a in (select a from t2) and (t3.a < 10 or t3.a >30);
@@ -276,7 +276,7 @@ from t2;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00
2 DEPENDENT SUBQUERY t1 ref_or_null a a 5 func 2 100.00 Using where; Full scan on NULL key
2 DEPENDENT SUBQUERY t4 ALL NULL NULL NULL NULL 100 100.00 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY t4 ALL NULL NULL NULL NULL 100 100.00 Using join buffer (flat, BNL join)
Warnings:
Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`oref` AS `oref`,<expr_cache><`test`.`t2`.`a`,`test`.`t2`.`b`,`test`.`t2`.`oref`>(<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(select `test`.`t1`.`a`,`test`.`t1`.`b` from `test`.`t1` join `test`.`t4` where ((`test`.`t1`.`c` = `test`.`t2`.`oref`) and trigcond(((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`))) and trigcond(((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`b`) or isnull(`test`.`t1`.`b`)))) having (trigcond(<is_not_null_test>(`test`.`t1`.`a`)) and trigcond(<is_not_null_test>(`test`.`t1`.`b`)))))) AS `Z` from `test`.`t2`
@@ -1250,19 +1250,19 @@ explain select * from t2 where a in (select straight_join A.a from t1 A, t1 B);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 10 Using where
2 DEPENDENT SUBQUERY A ALL NULL NULL NULL NULL 10 Using where
2 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 10 Using join buffer (flat, BNL join)
explain select * from t2 where a in (select straight_join A.a from t1 A, t1 B);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 10 Using where
2 DEPENDENT SUBQUERY A ALL NULL NULL NULL NULL 10 Using where
2 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 10 Using join buffer (flat, BNL join)
explain select straight_join * from t2 X, t2 Y
where X.a in (select straight_join A.a from t1 A, t1 B);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY X ALL NULL NULL NULL NULL 10 Using where
1 PRIMARY Y ALL NULL NULL NULL NULL 10 Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY A ALL NULL NULL NULL NULL 10 Using where
2 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 10 Using join buffer (flat, BNL join)
create table t0 (a int, b int);
insert into t0 values(1,1);
explain select * from t0, t3 where t3.a in (select a from t2) and (t3.a < 10 or t3.a >30);
@@ -19,7 +19,7 @@ SELECT 1 FROM t1
WHERE NOT EXISTS (SELECT 1 FROM t2 WHERE 1 = (SELECT MIN(t2.b) FROM t3))
ORDER BY count(*);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index NULL a 5 NULL 2 Using where; Using index; Using temporary
1 PRIMARY t1 index NULL a 5 NULL 2 Using index; Using temporary
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
3 DEPENDENT SUBQUERY t3 system NULL NULL NULL NULL 0 const row not found
# should not crash the next statement
@@ -1418,7 +1418,7 @@ GROUP BY f9;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(t2.f3),
(SELECT COUNT(f3) FROM t1 WHERE t2.f1) AS f9
FROM t2 JOIN t1 ON t1.f3
@@ -1434,7 +1434,7 @@ ORDER BY f9;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(t2.f3),
(SELECT COUNT(f3) FROM t1 WHERE t2.f1) AS f9
FROM t2 JOIN t1 ON t1.f3
@@ -2444,9 +2444,11 @@ WHERE EXISTS (
)";
EXECUTE stmt;
i
4
6
EXECUTE stmt;
i
4
6
drop table t1, t2, t3;
#
@@ -273,7 +273,7 @@ EXPLAIN SELECT 1 FROM t1 WHERE NOT EXISTS
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 1 Using where
2 DEPENDENT SUBQUERY t2 eq_ref PRIMARY,d d 2 func 1 Using where
3 DEPENDENT SUBQUERY t2 index NULL d 2 NULL 1 Using where; Using index
3 DEPENDENT SUBQUERY t2 index NULL d 2 NULL 1 Using index
DROP TABLE t2;
CREATE TABLE t2 (b INT, c INT, UNIQUE KEY (b), UNIQUE KEY (b, c )) ENGINE=INNODB;
INSERT INTO t2 VALUES (1, 1);
@@ -2163,6 +2163,115 @@ execute stmt;
a
0
drop table t1;
#
# MDEV-12429: IN subquery used in WHERE of EXISTS subquery
#
CREATE TABLE t1 (
pk INT, f1 INT NOT NULL, f2 VARCHAR(3), f3 INT NULL, PRIMARY KEY(pk)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1,1,'foo',8), (2,5,'bar',7);
SELECT sq1.f2 FROM t1 AS sq1
WHERE EXISTS ( SELECT * FROM t1 AS sq2
WHERE sq1.`pk` IN ( SELECT f1 FROM t1 ) AND sq2.f1 = sq1.f1 );
f2
foo
EXPLAIN
SELECT sq1.f2 FROM t1 AS sq1
WHERE EXISTS ( SELECT * FROM t1 AS sq2
WHERE sq1.`pk` IN ( SELECT f1 FROM t1 ) AND sq2.f1 = sq1.f1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY sq1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY <subquery3> eq_ref distinct_key distinct_key 4 func 1
2 DEPENDENT SUBQUERY sq2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
3 MATERIALIZED t1 ALL NULL NULL NULL NULL 2
# this checks the result set above
set @save_optimizer_switch= @@optimizer_switch;
set optimizer_switch= 'materialization=off,semijoin=off';
SELECT sq1.f2 FROM t1 AS sq1
WHERE EXISTS ( SELECT * FROM t1 AS sq2
WHERE sq1.`pk` IN ( SELECT f1 FROM t1 ) AND sq2.f1 = sq1.f1 );
f2
foo
set optimizer_switch= @save_optimizer_switch;
DROP TABLE t1;
#
# MDEV-12145: IN subquery used in WHERE of EXISTS subquery
#
CREATE TABLE t1 (f1 INT) ENGINE=MyISAM;
INSERT INTO t1 VALUES (4),(6);
CREATE TABLE t2 (i2 INT, KEY(i2)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (8),(7),(1);
CREATE TABLE t3 (f3 INT, i3 INT, KEY(i3)) ENGINE=MyISAM;
INSERT INTO t3 VALUES (8,0),(6,3),(2,8),(3,8),(1,6),(0,0),(1,0),(1,5);
SELECT * FROM t1
WHERE EXISTS ( SELECT * FROM t2, t3
WHERE i3 = i2 AND f1 IN ( SELECT f3 FROM t3 ) );
f1
6
EXPLAIN EXTENDED
SELECT * FROM t1
WHERE EXISTS ( SELECT * FROM t2, t3
WHERE i3 = i2 AND f1 IN ( SELECT f3 FROM t3 ) );
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 Using where
2 DEPENDENT SUBQUERY <subquery3> eq_ref distinct_key distinct_key 4 func 1 100.00
2 DEPENDENT SUBQUERY t2 index i2 i2 5 NULL 3 100.00 Using where; Using index; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY t3 ref i3 i3 5 test.t2.i2 2 100.00 Using index
3 MATERIALIZED t3 ALL NULL NULL NULL NULL 8 100.00
Warnings:
Note 1276 Field or reference 'test.t1.f1' of SELECT #2 was resolved in SELECT #1
Note 1003 select `test`.`t1`.`f1` AS `f1` from `test`.`t1` where <expr_cache><`test`.`t1`.`f1`>(exists(select 1 from `test`.`t2` semi join (`test`.`t3`) join `test`.`t3` where ((`test`.`t3`.`i3` = `test`.`t2`.`i2`) and (`test`.`t1`.`f1` = `test`.`t3`.`f3`))))
# this checks the result set above
set @save_optimizer_switch= @@optimizer_switch;
set optimizer_switch= 'materialization=off,semijoin=off';
SELECT * FROM t1
WHERE EXISTS ( SELECT * FROM t2, t3
WHERE i3 = i2 AND f1 IN ( SELECT f3 FROM t3 ) );
f1
6
set optimizer_switch= @save_optimizer_switch;
DROP TABLE t1,t2,t3;
#
# MDEV-9686: IN subquery used in WHERE of a subquery from select list
#
CREATE TABLE t1 (pk INT PRIMARY KEY, f1 INT);
INSERT INTO t1 VALUES (1, 4),(2, 3),(3, 3),(4, 6),(5, 3);
CREATE TABLE t2 (f2 INT);
INSERT INTO t2 VALUES (1),(2),(3),(4),(5);
# t1.pk is always IN ( SELECT f2 FROM t2 ),
# so the IN condition should be true for every row,
# and thus COUNT(*) should always return 5
SELECT pk, f1, ( SELECT COUNT(*) FROM t2
WHERE t1.pk IN ( SELECT f2 FROM t2 ) ) AS sq FROM t1;
pk f1 sq
1 4 5
2 3 5
3 3 5
4 6 5
5 3 5
EXPLAIN EXTENDED
SELECT pk, f1, ( SELECT COUNT(*) FROM t2
WHERE t1.pk IN ( SELECT f2 FROM t2 ) ) AS sq FROM t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5 100.00
2 DEPENDENT SUBQUERY <subquery3> eq_ref distinct_key distinct_key 4 func 1 100.00
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using join buffer (flat, BNL join)
3 MATERIALIZED t2 ALL NULL NULL NULL NULL 5 100.00
Warnings:
Note 1276 Field or reference 'test.t1.pk' of SELECT #2 was resolved in SELECT #1
Note 1003 select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`f1` AS `f1`,<expr_cache><`test`.`t1`.`pk`>((select count(0) from `test`.`t2` semi join (`test`.`t2`) where (`test`.`t1`.`pk` = `test`.`t2`.`f2`))) AS `sq` from `test`.`t1`
# this checks the result set above
set @save_optimizer_switch= @@optimizer_switch;
set optimizer_switch= 'materialization=off,semijoin=off';
SELECT pk, f1, ( SELECT COUNT(*) FROM t2
WHERE t1.pk IN ( SELECT f2 FROM t2 ) ) AS sq FROM t1;
pk f1 sq
1 4 5
2 3 5
3 3 5
4 6 5
5 3 5
set optimizer_switch= @save_optimizer_switch;
DROP TABLE t1,t2;
# End of 5.5 tests
set @subselect_mat_test_optimizer_switch_value=null;
set @@optimizer_switch='materialization=on,in_to_exists=off,semijoin=off';
@@ -177,7 +177,7 @@ id select_type table type possible_keys key key_len ref rows Extra
2 DEPENDENT SUBQUERY m16 ALL NULL NULL NULL NULL 3 Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY m17 ALL NULL NULL NULL NULL 3 Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY m18 ALL NULL NULL NULL NULL 3 Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY m19 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY m19 ALL NULL NULL NULL NULL 3 Using join buffer (flat, BNL join)
select * from
t1 left join t2 on (t2.a= t1.a and t2.a in (select pk from t10))
where t1.a < 5;
@@ -190,7 +190,7 @@ id select_type table type possible_keys key key_len ref rows Extra
2 DEPENDENT SUBQUERY m16 ALL NULL NULL NULL NULL 3 Using join buffer (incremental, BNL join)
2 DEPENDENT SUBQUERY m17 ALL NULL NULL NULL NULL 3 Using join buffer (incremental, BNL join)
2 DEPENDENT SUBQUERY m18 ALL NULL NULL NULL NULL 3 Using join buffer (incremental, BNL join)
2 DEPENDENT SUBQUERY m19 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (incremental, BNL join)
2 DEPENDENT SUBQUERY m19 ALL NULL NULL NULL NULL 3 Using join buffer (incremental, BNL join)
select * from
t1 left join t2 on (t2.a= t1.a and t2.a in (select pk from t10))
where t1.a < 5;

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