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Merge the fix for lp:944706, mdev-193

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unknown 2012-06-06 22:26:40 +03:00
commit c2677de7ac
48 changed files with 1613 additions and 433 deletions
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24
mysql-test/r/derived_opt.result
View file

@ -161,24 +161,24 @@ prepare stmt1 from @stmt ;
execute stmt1 ;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
5 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
4 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
5 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
4 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
execute stmt1 ;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
5 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
4 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
5 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
4 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
explain SELECT (SELECT SUM(c1 + c12 + 0.0) FROM t2 where (t1.c2 - 0e-3) = t2.c2 GROUP BY t1.c15 LIMIT 1) as scalar_s, exists (select 1.0e+0 from t2 where t2.c3 * 9.0000000000 = t1.c4) as exists_s, c5 * 4 in (select c6 + 0.3e+1 from t2) as in_s, (c7 - 4, c8 - 4) in (select c9 + 4.0, c10 + 40e-1 from t2) as in_row_s FROM t1, (select c25 x, c32 y from t2) tt WHERE x * 1 = c25;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
5 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
4 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
5 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
4 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
deallocate prepare stmt1;
drop tables t1,t2;
set @@optimizer_switch=@save_optimizer_switch;

16
mysql-test/r/explain.result
View file

@ -225,10 +225,10 @@ INSERT INTO t2 VALUES (NULL), (0);
EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) FROM t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1
Note 1003 select <expr_cache><NULL>((select 1 from `test`.`t2` where (`test`.`t2`.`d` = NULL))) AS `(SELECT 1 FROM t2 WHERE d = c)` from dual
Note 1003 select (select 1 from `test`.`t2` where (`test`.`t2`.`d` = NULL)) AS `(SELECT 1 FROM t2 WHERE d = c)` from dual
DROP TABLE t1, t2;
#
# Bug#30302: Tables that were optimized away are printed in the
@ -260,7 +260,7 @@ FLUSH TABLES;
EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT 1 FROM t1 t JOIN t2 WHERE b <= 1 AND t.a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
DROP TABLE t1, t2;
#
# Bug #48573: difference of index selection between rpm binary and
@ -287,7 +287,7 @@ WHERE t1.f1 GROUP BY t1.f1));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 SUBQUERY a system NULL NULL NULL NULL 1
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1
PREPARE stmt FROM
'EXPLAIN SELECT 1 FROM t1
WHERE 1 > ALL((SELECT t1.f1 FROM t1 RIGHT OUTER JOIN t1 a
@ -297,12 +297,12 @@ EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 SUBQUERY a system NULL NULL NULL NULL 1
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 SUBQUERY a system NULL NULL NULL NULL 1
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM
'EXPLAIN SELECT 1 FROM t1
@ -313,12 +313,12 @@ EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 SUBQUERY a system NULL NULL NULL NULL 1
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 SUBQUERY a system NULL NULL NULL NULL 1
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1
DEALLOCATE PREPARE stmt;
DROP TABLE t1;
End of 5.1 tests.

22
mysql-test/r/group_min_max.result
View file

@ -2398,12 +2398,12 @@ EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE EXISTS
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1_outer index NULL a 10 NULL 15 Using index
2 SUBQUERY t1 index NULL a 10 NULL 1 Using index
2 SUBQUERY t1 index NULL a 10 NULL 15 Using index
EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1_outer index NULL a 10 NULL 15 Using index
2 SUBQUERY t1 range NULL a 5 NULL 8 Using index for group-by
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t1 index NULL a 10 NULL 15 Using index
EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE
a IN (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2);
id select_type table type possible_keys key key_len ref rows Extra
@ -2419,9 +2419,9 @@ EXPLAIN SELECT 1 FROM t1 AS t1_outer1 JOIN t1 AS t1_outer2
ON t1_outer1.a = (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2)
AND t1_outer1.b = t1_outer2.b;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1_outer1 ref a a 5 const 2 Using where; Using index
1 PRIMARY t1_outer1 ref a a 5 const 1 Using where; Using index
1 PRIMARY t1_outer2 index NULL a 10 NULL 15 Using where; Using index; Using join buffer (flat, BNL join)
2 SUBQUERY t1 range NULL a 5 NULL 8 Using index for group-by
2 SUBQUERY t1 index NULL a 10 NULL 15 Using index
EXPLAIN SELECT (SELECT (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) x
FROM t1 AS t1_outer) x2 FROM t1 AS t1_outer2;
id select_type table type possible_keys key key_len ref rows Extra
@ -2756,8 +2756,8 @@ NULL
EXPLAIN
SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0);
id select_type table type possible_keys key key_len ref rows Extra
x x x x x x x x x Using where; Using index
x x x x x x x x x Using where; Using index
x x x x x x x x x Impossible WHERE noticed after reading const tables
x x x x x x x x x Using index
SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0);
MIN( a )
NULL
@ -2828,8 +2828,8 @@ NULL
EXPLAIN
SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0);
id select_type table type possible_keys key key_len ref rows Extra
x x x x x x x x x Using where; Using index
x x x x x x x x x Using where; Using index
x x x x x x x x x Impossible WHERE noticed after reading const tables
x x x x x x x x x Using index
SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0);
MIN( a )
NULL
@ -2907,8 +2907,8 @@ NULL
EXPLAIN
SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0);
id select_type table type possible_keys key key_len ref rows Extra
x x x x x x x x x Using where; Using index
x x x x x x x x x Using where; Using index
x x x x x x x x x Impossible WHERE noticed after reading const tables
x x x x x x x x x Using index
SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0);
MIN( a )
NULL

2
mysql-test/r/index_merge_innodb.result
View file

@ -654,7 +654,7 @@ EXPLAIN SELECT t1.f1 FROM t1
WHERE (SELECT COUNT(*) FROM t2 WHERE t2.f3 = 'h' AND t2.f2 = t1.f1) = 0 AND t1.f1 = 2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 const PRIMARY PRIMARY 4 const 1 Using index
2 DEPENDENT SUBQUERY t2 index_merge f2,f3 f3,f2 2,5 NULL 1 Using intersect(f3,f2); Using where; Using index
2 SUBQUERY t2 index_merge f2,f3 f3,f2 2,5 NULL 1 Using intersect(f3,f2); Using where; Using index
DROP TABLE t1,t2;
#
# BUG#56862/640419: Wrong result with sort_union index merge when one

2
mysql-test/r/index_merge_myisam.result
View file

@ -1487,7 +1487,7 @@ EXPLAIN SELECT t1.f1 FROM t1
WHERE (SELECT COUNT(*) FROM t2 WHERE t2.f3 = 'h' AND t2.f2 = t1.f1) = 0 AND t1.f1 = 2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system PRIMARY NULL NULL NULL 1
2 DEPENDENT SUBQUERY t2 ref f2,f3 f2 5 const 1 Using where
2 SUBQUERY t2 ref f2,f3 f2 5 const 1 Using where
DROP TABLE t1,t2;
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

4
mysql-test/r/join_outer.result
View file

@ -1895,10 +1895,10 @@ EXPLAIN EXTENDED
SELECT t2.a FROM t1 LEFT JOIN t2 ON (6) IN (SELECT a FROM t3);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
1 PRIMARY t2 ALL NULL NULL NULL NULL 1 100.00 Using where
1 PRIMARY t2 system NULL NULL NULL NULL 1 100.00
2 SUBQUERY t3 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t2` where 1
Note 1003 select NULL AS `a` from `test`.`t2` where 1
DROP TABLE t1,t2,t3;
#
# LP bug #817384 Wrong result with outer join + subquery in ON

4
mysql-test/r/join_outer_jcl6.result
View file

@ -1906,10 +1906,10 @@ EXPLAIN EXTENDED
SELECT t2.a FROM t1 LEFT JOIN t2 ON (6) IN (SELECT a FROM t3);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
1 PRIMARY t2 ALL NULL NULL NULL NULL 1 100.00 Using where
1 PRIMARY t2 system NULL NULL NULL NULL 1 100.00
2 SUBQUERY t3 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t2` where 1
Note 1003 select NULL AS `a` from `test`.`t2` where 1
DROP TABLE t1,t2,t3;
#
# LP bug #817384 Wrong result with outer join + subquery in ON

4
mysql-test/r/key.result
View file

@ -598,8 +598,8 @@ VALUES
EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1_outer index NULL a 10 NULL 15 Using index
2 SUBQUERY t1 range NULL a 5 NULL 8 Using index for group-by
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t1 index NULL a 10 NULL 15 Using index
SELECT 1 as RES FROM t1 AS t1_outer WHERE
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
RES

2
mysql-test/r/limit_rows_examined.result
View file

@ -679,7 +679,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1 Using temporary
1 PRIMARY t2 ALL NULL NULL NULL NULL 3 Distinct
2 SUBQUERY t3 ALL NULL NULL NULL NULL 3
2 SUBQUERY t2 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join)
2 SUBQUERY t2 ALL NULL NULL NULL NULL 3
SELECT DISTINCT a AS field1 FROM t1, t2
WHERE EXISTS (SELECT c FROM t3 LEFT JOIN t2 ON b = d)
HAVING field1 > 'aaa' LIMIT ROWS EXAMINED 20;

4
mysql-test/r/myisam_mrr.result
View file

@ -349,10 +349,10 @@ WHERE t2.int_key IS NULL
GROUP BY t2.pk
);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t2 ref int_key int_key 5 const 1 100.00 Using index condition
Warnings:
Note 1003 select min(1) AS `MIN(t1.pk)` from dual where exists(select `test`.`t2`.`pk` from `test`.`t2` where isnull(`test`.`t2`.`int_key`))
Note 1003 select min(`test`.`t1`.`pk`) AS `MIN(t1.pk)` from `test`.`t1` where 0
DROP TABLE t1, t2;
#
# BUG#42048 Discrepancy between MyISAM and Maria's ICP implementation

5
mysql-test/r/mysqld--help.result
View file

@ -159,6 +159,10 @@ The following options may be given as the first argument:
Enable the event scheduler. Possible values are ON, OFF,
and DISABLED (keep the event scheduler completely
deactivated, it cannot be activated run-time)
--expensive-subquery-limit=#
The maximum number of rows a subquery may examine in
order to be executed during optimization and used for
constant optimization
--expire-logs-days=#
If non-zero, binary logs will be purged after
expire_logs_days days; possible purges happen at startup
@ -885,6 +889,7 @@ delayed-queue-size 1000
div-precision-increment 4
engine-condition-pushdown FALSE
event-scheduler OFF
expensive-subquery-limit 100
expire-logs-days 0
external-locking FALSE
extra-max-connections 1

12
mysql-test/r/partition.result
View file

@ -2461,3 +2461,15 @@ SELECT 1 FROM t1 JOIN t1 AS t2 USING (a);
1
1
drop table t1;
#
# LP BUG#1001117 Crash on a simple select that uses a temptable view
# MySQL Bug #12330344 Crash and/or valgrind errors in free_io_cache with join, view,
# partitioned table
#
CREATE TABLE t1(a INT PRIMARY KEY) PARTITION BY LINEAR KEY (a);
CREATE ALGORITHM=TEMPTABLE VIEW vtmp AS
SELECT 1 FROM t1 AS t1_0 JOIN t1 ON t1_0.a LIKE (SELECT 1 FROM t1);
SELECT * FROM vtmp;
1
DROP VIEW vtmp;
DROP TABLE t1;

24
mysql-test/r/ps.result
View file

@ -160,26 +160,26 @@ execute stmt1 ;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
6 DERIVED NULL NULL NULL NULL NULL NULL NULL no matching row in const table
5 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
4 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
5 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
4 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
execute stmt1 ;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
6 DERIVED NULL NULL NULL NULL NULL NULL NULL no matching row in const table
5 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
4 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
5 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
4 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
explain SELECT (SELECT SUM(c1 + c12 + 0.0) FROM t2 where (t1.c2 - 0e-3) = t2.c2 GROUP BY t1.c15 LIMIT 1) as scalar_s, exists (select 1.0e+0 from t2 where t2.c3 * 9.0000000000 = t1.c4) as exists_s, c5 * 4 in (select c6 + 0.3e+1 from t2) as in_s, (c7 - 4, c8 - 4) in (select c9 + 4.0, c10 + 40e-1 from t2) as in_row_s FROM t1, (select c25 x, c32 y from t2) tt WHERE x * 1 = c25;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
6 DERIVED NULL NULL NULL NULL NULL NULL NULL no matching row in const table
5 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
4 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
5 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
4 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
deallocate prepare stmt1;
set optimizer_switch=@tmp_optimizer_switch;
drop tables t1,t2;

242
mysql-test/r/subselect.result
View file

@ -51,12 +51,12 @@ ERROR 42S22: Reference 'a' not supported (forward reference in item list)
EXPLAIN EXTENDED SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived2> system NULL NULL NULL NULL 1 100.00
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1276 Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1
Note 1276 Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1
Note 1003 select 1 AS `1` from dual having (<expr_cache><1>((select 1)) = 1)
Note 1003 select 1 AS `1` from dual having ((select 1) = 1)
SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1;
1
1
@ -371,12 +371,12 @@ INSERT INTO t8 (pseudo,email) VALUES ('joce1','test1');
INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1');
EXPLAIN EXTENDED SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using where; Using index
1 PRIMARY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
4 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
2 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using where
2 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00
3 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
Warnings:
Note 1003 select `test`.`t8`.`pseudo` AS `pseudo`,(select `test`.`t8`.`email` from `test`.`t8` where (`test`.`t8`.`pseudo` = (select 'joce' from `test`.`t8` where 1))) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where (`test`.`t8`.`pseudo` = (select 'joce' from `test`.`t8` where 1))
Note 1003 select 'joce' AS `pseudo`,(select 'test' from `test`.`t8` where 1) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where 1
SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM
t8 WHERE pseudo='joce');
ERROR 21000: Operand should contain 1 column(s)
@ -517,6 +517,7 @@ ERROR 21000: Subquery returns more than 1 row
show warnings;
Level Code Message
Error 1242 Subquery returns more than 1 row
Error 1028 Sort aborted: Subquery returns more than 1 row
drop table t1;
create table t1 (a int);
insert into t1 values (1),(2),(3);
@ -547,11 +548,7 @@ SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=1) FROM (SELECT
numreponse (SELECT numeropost FROM t1 HAVING numreponse=1)
INSERT INTO t1 (numeropost,numreponse,pseudo) VALUES (1,1,'joce'),(1,2,'joce'),(1,3,'test');
EXPLAIN EXTENDED SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 const PRIMARY,numreponse PRIMARY 7 const,const 1 100.00 Using where; Using index
2 SUBQUERY t1 ref PRIMARY PRIMARY 3 const 2 100.00 Using index
Warnings:
Note 1003 select `test`.`t1`.`numreponse` AS `numreponse` from `test`.`t1` where ((`test`.`t1`.`numeropost` = '1') and (`test`.`t1`.`numreponse` = (select 1 from `test`.`t1` where (`test`.`t1`.`numeropost` = '1'))))
ERROR 21000: Subquery returns more than 1 row
SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
ERROR 21000: Subquery returns more than 1 row
EXPLAIN EXTENDED SELECT MAX(numreponse) FROM t1 WHERE numeropost='1';
@ -907,7 +904,7 @@ a t1.a in (select t2.a from t2)
explain extended SELECT t1.a, t1.a in (select t2.a from t2) FROM t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL PRIMARY 4 NULL 4 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery a a 5 func 2 100.00 Using index
2 SUBQUERY t2 index_subquery a a 5 func 2 100.00 Using index
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a`,<expr_cache><`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`a`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`a`) in t2 on a checking NULL having <is_not_null_test>(`test`.`t2`.`a`))))) AS `t1.a in (select t2.a from t2)` from `test`.`t1`
CREATE TABLE t3 (a int(11) default '0');
@ -1608,25 +1605,25 @@ a3 1
explain extended select s1, s1 NOT IN (SELECT s1 FROM t2) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,(not(<expr_cache><`test`.`t1`.`s1`>(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`)))))))) AS `s1 NOT IN (SELECT s1 FROM t2)` from `test`.`t1`
explain extended select s1, s1 = ANY (SELECT s1 FROM t2) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,<expr_cache><`test`.`t1`.`s1`>(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`)))))) AS `s1 = ANY (SELECT s1 FROM t2)` from `test`.`t1`
explain extended select s1, s1 <> ALL (SELECT s1 FROM t2) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,(not(<expr_cache><`test`.`t1`.`s1`>(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`)))))))) AS `s1 <> ALL (SELECT s1 FROM t2)` from `test`.`t1`
explain extended select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Using where; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Using where; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,(not(<expr_cache><`test`.`t1`.`s1`>(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL where (`test`.`t2`.`s1` < 'a2') having trigcond(<is_not_null_test>(`test`.`t2`.`s1`)))))))) AS `s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2')` from `test`.`t1`
drop table t1,t2;
@ -1675,34 +1672,34 @@ select * from t3 where NULL >= any (select b from t2);
a
explain extended select * from t3 where NULL >= any (select b from t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= any (select b from t2 group by 1);
a
explain extended select * from t3 where NULL >= any (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= some (select b from t2);
a
explain extended select * from t3 where NULL >= some (select b from t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= some (select b from t2 group by 1);
a
explain extended select * from t3 where NULL >= some (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
insert into t2 values (2,2), (2,1), (3,3), (3,1);
select * from t3 where a > all (select max(b) from t2 group by a);
a
@ -1764,7 +1761,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
3 UNION t1 system NULL NULL NULL NULL 1 100.00
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 select 'e' AS `s1` from dual where <nop>(<in_optimizer>('f',(<min>(select 'e' from dual union select 'e' from dual) < 'f')))
Note 1003 select 'e' AS `s1` from dual where 1
drop table t1;
CREATE TABLE t1 (number char(11) NOT NULL default '') ENGINE=MyISAM CHARSET=latin1;
INSERT INTO t1 VALUES ('69294728265'),('18621828126'),('89356874041'),('95895001874');
@ -3099,8 +3096,8 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system PRIMARY NULL NULL NULL 1
1 PRIMARY r eq_ref PRIMARY PRIMARY 4 const 1 Using where
2 DEPENDENT SUBQUERY t2 range b b 40 NULL 2 Using where
1 PRIMARY r const PRIMARY PRIMARY 4 const 1
2 SUBQUERY t2 range b b 40 NULL 2 Using where
SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
@ -3111,8 +3108,8 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system PRIMARY NULL NULL NULL 1
1 PRIMARY r eq_ref PRIMARY PRIMARY 4 const 1 Using where
2 DEPENDENT SUBQUERY t2 range b b 40 NULL 2 Using index condition
1 PRIMARY r const PRIMARY PRIMARY 4 const 1
2 SUBQUERY t2 range b b 40 NULL 2 Using index condition
SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
@ -3163,7 +3160,7 @@ INSERT INTO t2 VALUES (1),(2),(3);
EXPLAIN SELECT a, a IN (SELECT a FROM t1) FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 3
2 DEPENDENT SUBQUERY t1 index_subquery a a 5 func 2 Using index; Full scan on NULL key
2 SUBQUERY t1 index_subquery a a 5 func 2 Using index; Full scan on NULL key
SELECT a, a IN (SELECT a FROM t1) FROM t2;
a a IN (SELECT a FROM t1)
1 1
@ -3699,7 +3696,7 @@ ORDER BY t1.t DESC LIMIT 1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
1 PRIMARY t1 index NULL PRIMARY 16 NULL 11 Using where; Using index
2 DEPENDENT SUBQUERY t1 range PRIMARY PRIMARY 16 NULL 5 Using where; Using index
2 SUBQUERY t1 range PRIMARY PRIMARY 16 NULL 5 Using where; Using index
SELECT * FROM t1,t2
WHERE t1.t = (SELECT t1.t FROM t1
WHERE t1.t < t2.t AND t1.i2=1 AND t2.i1=t1.i1
@ -3727,8 +3724,8 @@ explain select * from t1 where not exists
((select t11.i from t1 t11) union (select t12.i from t1 t12));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY t11 system NULL NULL NULL NULL 0 const row not found
3 UNION t12 system NULL NULL NULL NULL 0 const row not found
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
3 UNION NULL NULL NULL NULL NULL NULL NULL no matching row in const table
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
DROP TABLE t1;
CREATE TABLE t1 (a VARCHAR(250), b INT auto_increment, PRIMARY KEY (b));
@ -4198,8 +4195,8 @@ CREATE TABLE t1 (a int, b int, KEY (a));
INSERT INTO t1 VALUES (1,1),(2,1);
EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT COUNT(*) FROM t1 GROUP BY b);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ref a a 5 const 0 Using where; Using index
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using temporary; Using filesort
1 PRIMARY t1 ref a a 5 const 1 Using where; Using index
2 SUBQUERY internal_tmp_table ALL group_key NULL NULL NULL 1 Using temporary; Using filesort
DROP TABLE t1;
CREATE TABLE t1 (id int NOT NULL, st CHAR(2), INDEX idx(id));
INSERT INTO t1 VALUES
@ -4580,7 +4577,7 @@ FROM t1
WHERE a = 230;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
SELECT MAX(b), (SELECT COUNT(*) FROM st1,st2 WHERE st2.b <= t1.b)
FROM t1
WHERE a = 230;
@ -4626,7 +4623,7 @@ 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
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00
Warnings:
Note 1003 select 1 AS `1` from `test`.`t1` where <nop>(<in_optimizer>(1,((select max(`test`.`t1`.`a1`) from `test`.`t1`) > 1)))
Note 1003 select 1 AS `1` from `test`.`t1` where 1
SELECT 1 FROM t1 WHERE 1 < SOME (SELECT a1 FROM t1);
1
1
@ -5969,7 +5966,7 @@ id select_type table type possible_keys key key_len ref rows Extra
EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 SUBQUERY t1 ref a a 5 const 1 Using index
2 SUBQUERY t1 ref a a 5 const 1
DROP TABLE t1;
#
# BUG#12616253 - WRONG RESULT WITH EXISTS(SUBQUERY) (MISSING ROWS)
@ -6130,7 +6127,7 @@ set optimizer_switch=@tmp_optimizer_switch;
EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 SUBQUERY t1 ref a a 5 const 1 Using index
2 SUBQUERY t1 ref a a 5 const 1
DROP TABLE t1;
#
@ -6542,7 +6539,7 @@ EXPLAIN
SELECT COUNT(f1), (SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(f1), (SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
COUNT(f1) f4
0 NULL
@ -6550,7 +6547,7 @@ EXPLAIN
SELECT COUNT(f1), exists(SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(f1), exists(SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
COUNT(f1) f4
0 0
@ -6589,5 +6586,162 @@ NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
SELECT SUM(a) AS f1, a AS f2 FROM (t1, t2) HAVING f2 >= ALL (SELECT 4 UNION SELECT 5) AND f1 = 7;
f1 f2
drop table t1,t2;
#
# LP BUG#944706 Query with impossible or constant subquery in WHERE or HAVING is not
# precomputed and thus not part of optimization
#
CREATE TABLE t1 ( a VARCHAR(16), KEY (a) );
INSERT INTO t1 VALUES ('Abilene'),('Akron'),('Albany'),('Albuquerque'),('Alexandria'),('Allentown'),
('Amarillo'),('Anaheim'),('Anchorage'),('Ann Arbor'),('Arden-Arcade');
EXPLAIN
SELECT MAX( alias2.a ) AS field
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR alias1.a = 'y'
HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible HAVING
2 SUBQUERY t1 index_subquery a a 19 const 1 Using index; Using where
SELECT MAX( alias2.a ) AS field
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR alias1.a = 'y'
HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
field
EXPLAIN
SELECT MAX( alias2.a )
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 index a a 19 NULL 11 Using where; Using index
1 PRIMARY alias2 ref a a 19 test.alias1.a 2 Using index
1 PRIMARY alias3 index NULL a 19 NULL 11 Using index; Using join buffer (flat, BNL join)
2 SUBQUERY t1 index_subquery a a 19 const 1 Using index; Using where
SELECT MAX( alias2.a )
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
MAX( alias2.a )
Arden-Arcade
drop table t1;
#
# MDEV-277 CHEAP SQ: Server crashes in st_join_table::get_examined_rows
# with semijoin+materialization, IN and = subqueries
#
CREATE TABLE t1 (a1 INT);
INSERT INTO t1 VALUES (4),(6);
CREATE TABLE t2 (b1 INT);
INSERT INTO t2 VALUES (1),(7);
EXPLAIN
SELECT * FROM t1
WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY <subquery3> eq_ref distinct_key distinct_key 4 func 1
3 MATERIALIZED t1 ALL NULL NULL NULL NULL 2
3 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
SELECT * FROM t1
WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
a1
drop table t1, t2;
#
# MDEV-287 CHEAP SQ: A query with subquery in SELECT list, EXISTS,
# inner joins takes hundreds times longer
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(7);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (4),(5);
CREATE TABLE t3 (c INT);
INSERT INTO t3 VALUES (8),(3);
set @@expensive_subquery_limit= 0;
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 ALL NULL NULL NULL NULL 2
1 PRIMARY alias2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
1 PRIMARY alias3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t3 ALL NULL NULL NULL NULL 2
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
(SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 2
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 8
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 22
set @@expensive_subquery_limit= default;
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 ALL NULL NULL NULL NULL 2
1 PRIMARY alias2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
1 PRIMARY alias3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t3 ALL NULL NULL NULL NULL 2
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
(SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 16
drop table t1, t2, t3;
#
# MDEV-288 CHEAP SQ: Valgrind warnings "Memory lost" with IN and EXISTS nested subquery, materialization+semijoin
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (0),(8);
CREATE TABLE t2 (b INT PRIMARY KEY);
INSERT INTO t2 VALUES (1),(2);
EXPLAIN
SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
3 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
a
drop table t1,t2;
# return optimizer switch changed in the beginning of this test
set optimizer_switch=@subselect_tmp;

2
mysql-test/r/subselect3.result
View file

@ -1479,7 +1479,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
3 MATERIALIZED t3 ALL NULL NULL NULL NULL 2 100.00
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (not(<expr_cache><(select `test`.`t2`.`a` from `test`.`t2` where (`test`.`t2`.`a` = 9))>(<in_optimizer>((select `test`.`t2`.`a` from `test`.`t2` where (`test`.`t2`.`a` = 9)),(select `test`.`t2`.`a` from `test`.`t2` where (`test`.`t2`.`a` = 9)) in ( <materialize> (select `test`.`t3`.`b` from `test`.`t3` ), <primary_index_lookup>(9 in <temporary table> on distinct_key where ((9 = `<subquery3>`.`b`))))))))
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where 1
SELECT * FROM t1
WHERE (
( SELECT a FROM t2 WHERE a = 9 ),

2
mysql-test/r/subselect3_jcl6.result
View file

@ -1489,7 +1489,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
3 MATERIALIZED t3 ALL NULL NULL NULL NULL 2 100.00
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (not(<expr_cache><(select `test`.`t2`.`a` from `test`.`t2` where (`test`.`t2`.`a` = 9))>(<in_optimizer>((select `test`.`t2`.`a` from `test`.`t2` where (`test`.`t2`.`a` = 9)),(select `test`.`t2`.`a` from `test`.`t2` where (`test`.`t2`.`a` = 9)) in ( <materialize> (select `test`.`t3`.`b` from `test`.`t3` ), <primary_index_lookup>(9 in <temporary table> on distinct_key where ((9 = `<subquery3>`.`b`))))))))
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where 1
SELECT * FROM t1
WHERE (
( SELECT a FROM t2 WHERE a = 9 ),

55
mysql-test/r/subselect4.result
View file

@ -226,10 +226,10 @@ NULL
EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 ;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1
Note 1003 select <expr_cache><>((select 1 from `test`.`t2` where 0)) AS `RESULT` from dual
Note 1003 select (select 1 from `test`.`t2` where 0) AS `RESULT` from dual
first equivalent variant
SELECT (SELECT 1 FROM t2 WHERE d = IFNULL(c,NULL)) AS RESULT FROM t1 GROUP BY c ;
RESULT
@ -237,10 +237,10 @@ NULL
EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = IFNULL(c,NULL)) AS RESULT FROM t1 GROUP BY c;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1
Note 1003 select <expr_cache><>((select 1 from `test`.`t2` where 0)) AS `RESULT` from dual group by NULL
Note 1003 select (select 1 from `test`.`t2` where 0) AS `RESULT` from dual group by NULL
second equivalent variant
SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 GROUP BY c ;
RESULT
@ -248,10 +248,10 @@ NULL
EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 GROUP BY c ;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1
Note 1003 select <expr_cache><>((select 1 from `test`.`t2` where 0)) AS `RESULT` from dual group by NULL
Note 1003 select (select 1 from `test`.`t2` where 0) AS `RESULT` from dual group by NULL
DROP TABLE t1,t2;
#
# BUG#45928 "Differing query results depending on MRR and
@ -562,7 +562,7 @@ WHERE f3 = (
SELECT t1.f3 FROM t1
WHERE ( t1.f10 ) IN ( SELECT f11 FROM t2 GROUP BY f11 ));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ref f3 f3 5 const 0 Using where
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY <subquery3> eq_ref distinct_key distinct_key 4 func 1
3 MATERIALIZED t2 ALL NULL NULL NULL NULL 2
@ -577,7 +577,7 @@ WHERE f3 = (
SELECT f3 FROM t1
WHERE ( f10, f10 ) IN ( SELECT f11, f11 FROM t2 GROUP BY f11 ));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ref f3 f3 5 const 0 Using where
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY <subquery3> eq_ref distinct_key distinct_key 8 func,func 1
3 MATERIALIZED t2 ALL NULL NULL NULL NULL 2
@ -1220,6 +1220,13 @@ id select_type table type possible_keys key key_len ref rows Extra
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
3 SUBQUERY SQ1_t1 index NULL f4 5 NULL 2 Using index; Using temporary
3 SUBQUERY SQ1_t3 index f4 f4 5 NULL 2 Using where; Using index; Using join buffer (flat, BNL join)
SELECT * FROM t1 WHERE
(SELECT f2 FROM t2
WHERE f4 <= ALL
(SELECT max(SQ1_t1.f4)
FROM t3 AS SQ1_t1 JOIN t3 AS SQ1_t3 ON SQ1_t3.f4
GROUP BY SQ1_t1.f4));
ERROR 21000: Subquery returns more than 1 row
drop table t1, t2, t3;
#
# BUG#52317: Assertion failing in Field_varstring::store()
@ -1250,10 +1257,9 @@ FROM t2 JOIN t1 ON t1.f3
WHERE ('v') IN (SELECT f4 FROM t2)
GROUP BY f9;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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
2 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
@ -1267,17 +1273,16 @@ FROM t2 JOIN t1 ON t1.f3
WHERE ('v') IN (SELECT f4 FROM t2)
ORDER BY f9;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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
2 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
WHERE ('v') IN (SELECT f4 FROM t2)
ORDER BY f9;
COUNT(t2.f3) f9
0 2
0 NULL
EXPLAIN
SELECT COUNT(t2.f3),
(SELECT t2.f1 FROM t1 limit 1) AS f9
@ -1285,10 +1290,9 @@ FROM t2 JOIN t1
WHERE ('v') IN (SELECT f4 FROM t2)
GROUP BY f9;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(t2.f3),
(SELECT t2.f1 FROM t1 limit 1) AS f9
FROM t2 JOIN t1
@ -1302,10 +1306,9 @@ FROM t2 JOIN t1
WHERE ('v') IN (SELECT f4 FROM t2)
ORDER BY f9;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(t2.f3),
(SELECT t2.f1 FROM t1 limit 1) AS f9
FROM t2 JOIN t1
@ -1325,7 +1328,7 @@ EXPLAIN
SELECT (SELECT f1 FROM t1) AS field1 FROM t2 GROUP BY field1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 system NULL NULL NULL NULL 0 const row not found
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
SELECT (SELECT f1 FROM t1) AS field1 FROM t2 GROUP BY field1;
field1
NULL
@ -1333,7 +1336,7 @@ EXPLAIN
SELECT (SELECT f1 FROM t1) AS field1 FROM t2 ORDER BY field1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 system NULL NULL NULL NULL 0 const row not found
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
SELECT (SELECT f1 FROM t1) AS field1 FROM t2 ORDER BY field1;
field1
NULL
@ -1631,7 +1634,7 @@ SET SESSION optimizer_switch='in_to_exists=on,materialization=off';
EXPLAIN
SELECT * FROM t1 WHERE ( 6 ) NOT IN ( SELECT t2.f3 FROM t2 JOIN t3 ON t3.f10 = t2.f10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t3 system NULL NULL NULL NULL 1
2 SUBQUERY t2 ref_or_null f10 f10 10 const,const 2 Using where; Using index
SELECT * FROM t1 WHERE ( 6 ) NOT IN ( SELECT t2.f3 FROM t2 JOIN t3 ON t3.f10 = t2.f10);
@ -1852,8 +1855,8 @@ GROUP BY 1, 2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 system NULL NULL NULL NULL 1 Using temporary; Using filesort
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 MATERIALIZED t1 system NULL NULL NULL NULL 0 const row not found
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
3 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL no matching row in const table
PREPARE st1 FROM "
SELECT t2.f1, (SELECT f2 FROM t1 WHERE (7) IN (SELECT f1 FROM t1))
FROM t2 JOIN t3 ON t3.f4 = t2.f4

8
mysql-test/r/subselect_cache.result
View file

@ -486,9 +486,9 @@ Handler_read_key 7
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 10
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 42
Handler_read_rnd_next 31
set optimizer_switch='subquery_cache=off';
flush status;
select a from t1 ORDER BY (select d from t2 where b=c);
@ -514,9 +514,9 @@ Handler_read_key 0
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 10
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 72
Handler_read_rnd_next 61
set optimizer_switch='subquery_cache=on';
#single value subquery test (distinct ORDER BY)
flush status;

4
mysql-test/r/subselect_extra_no_semijoin.result
View file

@ -46,7 +46,7 @@ select * from t1
where id in (select id from t1 as x1 where (t1.cur_date is null));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
Warnings:
Note 1276 Field or reference 'test.t1.cur_date' of SELECT #2 was resolved in SELECT #1
Note 1003 select 1 AS `id`,'2007-04-25 18:30:22' AS `cur_date` from dual where <expr_cache><1>(<in_optimizer>(1,<exists>(select `test`.`x1`.`id` from `test`.`t1` `x1` where 0)))
@ -58,7 +58,7 @@ select * from t2
where id in (select id from t2 as x1 where (t2.cur_date is null));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1 100.00
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
Warnings:
Note 1276 Field or reference 'test.t2.cur_date' of SELECT #2 was resolved in SELECT #1
Note 1003 select 1 AS `id`,'2007-04-25' AS `cur_date` from dual where <expr_cache><1>(<in_optimizer>(1,<exists>(select `test`.`x1`.`id` from `test`.`t2` `x1` where 0)))

8
mysql-test/r/subselect_innodb.result
View file

@ -332,8 +332,8 @@ FROM t2
WHERE (SELECT DISTINCT b FROM t3) > 0);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 const PRIMARY PRIMARY 4 const 1 Using where; Using index
2 SUBQUERY t2 ALL NULL NULL NULL NULL 1
3 SUBQUERY t3 ALL NULL NULL NULL NULL 1 Using temporary
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
3 SUBQUERY internal_tmp_table ALL group_key NULL NULL NULL 0 Using temporary
SELECT *
FROM t1
WHERE t1.a = (
@ -361,7 +361,7 @@ GROUP BY 1
);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY t1 ALL NULL NULL NULL NULL 1
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
3 SUBQUERY t3 ALL NULL NULL NULL NULL 1
SELECT MAX( f1 ) FROM t2
WHERE f2 >= (
@ -386,7 +386,7 @@ select 1 from t1 where 1 like (select 1 from t1 where 1 <=> (select 1 from t1 gr
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 1
2 SUBQUERY t1 ALL NULL NULL NULL NULL 1
3 SUBQUERY t1 ALL NULL NULL NULL NULL 1 Using temporary; Using filesort
3 SUBQUERY internal_tmp_table ALL group_key NULL NULL NULL 1 Using temporary; Using filesort
select 1 from t1 where 1 like (select 1 from t1 where 1 <=> (select 1 from t1 group by a1));
1
1

40
mysql-test/r/subselect_mat.result
View file

@ -1152,8 +1152,8 @@ create table t2 (b1 int);
insert into t1 values (5);
explain select min(a1) from t1 where 7 in (select max(b1) from t2 group by b1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 MATERIALIZED t2 system NULL NULL NULL NULL 0 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL no matching row in const table
select min(a1) from t1 where 7 in (select max(b1) from t2 group by b1);
min(a1)
NULL
@ -1162,8 +1162,8 @@ set @@optimizer_switch=@optimizer_switch_local_default;
set @@optimizer_switch='materialization=off,in_to_exists=on';
explain select min(a1) from t1 where 7 in (select max(b1) from t2 group by b1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
select min(a1) from t1 where 7 in (select max(b1) from t2 group by b1);
min(a1)
NULL
@ -1171,8 +1171,8 @@ set @@optimizer_switch=@optimizer_switch_local_default;
set @@optimizer_switch='semijoin=off';
explain select min(a1) from t1 where 7 in (select b1 from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 MATERIALIZED t2 system NULL NULL NULL NULL 0 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL no matching row in const table
select min(a1) from t1 where 7 in (select b1 from t2);
min(a1)
NULL
@ -1181,16 +1181,16 @@ set @@optimizer_switch='materialization=off,in_to_exists=on';
# with MariaDB and MWL#90, this particular case is solved:
explain select min(a1) from t1 where 7 in (select b1 from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
select min(a1) from t1 where 7 in (select b1 from t2);
min(a1)
NULL
# but when we go around MWL#90 code, the problem still shows up:
explain select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
min(a1)
NULL
@ -1932,7 +1932,7 @@ WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
1 PRIMARY t2 index NULL c 5 NULL 8 Using where; Using index
2 MATERIALIZED s2 ref d d 4 const 1 Using where; Using index
2 MATERIALIZED s2 ref d d 4 const 2 Using where; Using index
2 MATERIALIZED s1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t2 ALL NULL NULL NULL NULL 8
SELECT a, c FROM t1, t2
@ -1951,8 +1951,8 @@ WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
1 PRIMARY t2 index NULL c 5 NULL 8 Using where; Using index
2 MATERIALIZED s2 ref d d 4 const 1 Using where; Using index
2 MATERIALIZED s1 hash_ALL NULL #hash#$hj 5 test.s2.d 8 Using where; Using join buffer (flat, BNLH join)
2 MATERIALIZED s2 ref d d 4 const 2 Using where; Using index
2 MATERIALIZED s1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t2 ALL NULL NULL NULL NULL 8
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2
@ -2166,7 +2166,7 @@ set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_
EXPLAIN
SELECT * FROM t2 WHERE (SELECT f3a FROM t3) NOT IN (SELECT f1a FROM t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 MATERIALIZED t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
SELECT * FROM t2 WHERE (SELECT f3a FROM t3) NOT IN (SELECT f1a FROM t1);
@ -2175,7 +2175,7 @@ EXPLAIN
SELECT (SELECT f3a FROM t3) NOT IN (SELECT f1a FROM t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
3 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
3 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
SELECT (SELECT f3a FROM t3) NOT IN (SELECT f1a FROM t1);
(SELECT f3a FROM t3) NOT IN (SELECT f1a FROM t1)
@ -2192,7 +2192,7 @@ EXPLAIN
SELECT (SELECT f3a, f3b FROM t3) NOT IN (SELECT f1a, f1b FROM t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
3 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
3 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
SELECT (SELECT f3a, f3b FROM t3) NOT IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3) NOT IN (SELECT f1a, f1b FROM t1)
@ -2235,10 +2235,10 @@ NULL
EXPLAIN EXTENDED
SELECT MAX(t1.b) AS max_res FROM t1 WHERE (9) IN (SELECT a FROM t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL b 5 NULL 2 100.00 Using index
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 100.00
Warnings:
Note 1003 select max(`test`.`t1`.`b`) AS `max_res` from `test`.`t1` where <expr_cache><9>(<in_optimizer>(9,9 in ( <materialize> (select `test`.`t2`.`a` from `test`.`t2` ), <primary_index_lookup>(9 in <temporary table> on distinct_key where ((9 = `<subquery2>`.`a`))))))
Note 1003 select max(`test`.`t1`.`b`) AS `max_res` from `test`.`t1` where 0
set @@optimizer_switch='materialization=off,in_to_exists=on,semijoin=off';
SELECT MAX(t1.b) AS max_res FROM t1 WHERE (9) IN (SELECT a FROM t2);
max_res
@ -2246,10 +2246,10 @@ NULL
EXPLAIN EXTENDED
SELECT MAX(t1.b) AS max_res FROM t1 WHERE (9) IN (SELECT a FROM t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL b 5 NULL 2 100.00 Using index
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select max(`test`.`t1`.`b`) AS `max_res` from `test`.`t1` where <expr_cache><9>(<in_optimizer>(9,<exists>(select `test`.`t2`.`a` from `test`.`t2` where (9 = `test`.`t2`.`a`))))
Note 1003 select max(`test`.`t1`.`b`) AS `max_res` from `test`.`t1` where 0
DROP TABLE t1,t2;
#
# LPBUG#825095: Wrong result with materialization and NOT IN with 2 expressions

2
mysql-test/r/subselect_mat_cost.result
View file

@ -496,7 +496,7 @@ from City
where City.population > 10000000;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY City range Population Population 5 NULL 4 Using index condition; Rowid-ordered scan
2 DEPENDENT SUBQUERY Country index_subquery CountryCapital CountryCapital 5 func 2 Using index; Using where
2 SUBQUERY Country index_subquery CountryCapital CountryCapital 5 func 2 Using index; Using where
select Name, City.id in (select capital from Country where capital is not null) as is_capital
from City
where City.population > 10000000;

4
mysql-test/r/subselect_mat_cost_bugs.result
View file

@ -124,7 +124,7 @@ FROM t3 RIGHT JOIN t1 ON t1.pk = t3.f1
WHERE t3.f3 OR ( 3 ) IN ( SELECT f2 FROM t2 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
SELECT t1.*
FROM t3 RIGHT JOIN t1 ON t1.pk = t3.f1
WHERE t3.f3 OR ( 3 ) IN ( SELECT f2 FROM t2 );
@ -148,7 +148,7 @@ FROM t2 GROUP BY f1
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY t1 system NULL NULL NULL NULL 1
3 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using temporary; Using filesort
3 SUBQUERY internal_tmp_table ALL group_key NULL NULL NULL 1 Using temporary; Using filesort
drop table t1, t2, t3;
#
# LP BUG#715034 Item_sum_distinct::clear(): Assertion `tree != 0' failed

247
mysql-test/r/subselect_no_mat.result
View file

@ -58,12 +58,12 @@ ERROR 42S22: Reference 'a' not supported (forward reference in item list)
EXPLAIN EXTENDED SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived2> system NULL NULL NULL NULL 1 100.00
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1276 Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1
Note 1276 Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1
Note 1003 select 1 AS `1` from dual having (<expr_cache><1>((select 1)) = 1)
Note 1003 select 1 AS `1` from dual having ((select 1) = 1)
SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1;
1
1
@ -378,12 +378,12 @@ INSERT INTO t8 (pseudo,email) VALUES ('joce1','test1');
INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1');
EXPLAIN EXTENDED SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using where; Using index
1 PRIMARY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
4 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
2 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using where
2 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00
3 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
Warnings:
Note 1003 select `test`.`t8`.`pseudo` AS `pseudo`,(select `test`.`t8`.`email` from `test`.`t8` where (`test`.`t8`.`pseudo` = (select 'joce' from `test`.`t8` where 1))) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where (`test`.`t8`.`pseudo` = (select 'joce' from `test`.`t8` where 1))
Note 1003 select 'joce' AS `pseudo`,(select 'test' from `test`.`t8` where 1) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where 1
SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM
t8 WHERE pseudo='joce');
ERROR 21000: Operand should contain 1 column(s)
@ -524,6 +524,7 @@ ERROR 21000: Subquery returns more than 1 row
show warnings;
Level Code Message
Error 1242 Subquery returns more than 1 row
Error 1028 Sort aborted: Subquery returns more than 1 row
drop table t1;
create table t1 (a int);
insert into t1 values (1),(2),(3);
@ -554,11 +555,7 @@ SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=1) FROM (SELECT
numreponse (SELECT numeropost FROM t1 HAVING numreponse=1)
INSERT INTO t1 (numeropost,numreponse,pseudo) VALUES (1,1,'joce'),(1,2,'joce'),(1,3,'test');
EXPLAIN EXTENDED SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 const PRIMARY,numreponse PRIMARY 7 const,const 1 100.00 Using where; Using index
2 SUBQUERY t1 ref PRIMARY PRIMARY 3 const 2 100.00 Using index
Warnings:
Note 1003 select `test`.`t1`.`numreponse` AS `numreponse` from `test`.`t1` where ((`test`.`t1`.`numeropost` = '1') and (`test`.`t1`.`numreponse` = (select 1 from `test`.`t1` where (`test`.`t1`.`numeropost` = '1'))))
ERROR 21000: Subquery returns more than 1 row
SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
ERROR 21000: Subquery returns more than 1 row
EXPLAIN EXTENDED SELECT MAX(numreponse) FROM t1 WHERE numeropost='1';
@ -914,7 +911,7 @@ a t1.a in (select t2.a from t2)
explain extended SELECT t1.a, t1.a in (select t2.a from t2) FROM t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL PRIMARY 4 NULL 4 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery a a 5 func 2 100.00 Using index
2 SUBQUERY t2 index_subquery a a 5 func 2 100.00 Using index
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a`,<expr_cache><`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`a`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`a`) in t2 on a checking NULL having <is_not_null_test>(`test`.`t2`.`a`))))) AS `t1.a in (select t2.a from t2)` from `test`.`t1`
CREATE TABLE t3 (a int(11) default '0');
@ -1615,25 +1612,25 @@ a3 1
explain extended select s1, s1 NOT IN (SELECT s1 FROM t2) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,(not(<expr_cache><`test`.`t1`.`s1`>(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`)))))))) AS `s1 NOT IN (SELECT s1 FROM t2)` from `test`.`t1`
explain extended select s1, s1 = ANY (SELECT s1 FROM t2) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,<expr_cache><`test`.`t1`.`s1`>(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`)))))) AS `s1 = ANY (SELECT s1 FROM t2)` from `test`.`t1`
explain extended select s1, s1 <> ALL (SELECT s1 FROM t2) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,(not(<expr_cache><`test`.`t1`.`s1`>(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`)))))))) AS `s1 <> ALL (SELECT s1 FROM t2)` from `test`.`t1`
explain extended select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Using where; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Using where; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,(not(<expr_cache><`test`.`t1`.`s1`>(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL where (`test`.`t2`.`s1` < 'a2') having trigcond(<is_not_null_test>(`test`.`t2`.`s1`)))))))) AS `s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2')` from `test`.`t1`
drop table t1,t2;
@ -1682,34 +1679,34 @@ select * from t3 where NULL >= any (select b from t2);
a
explain extended select * from t3 where NULL >= any (select b from t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= any (select b from t2 group by 1);
a
explain extended select * from t3 where NULL >= any (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= some (select b from t2);
a
explain extended select * from t3 where NULL >= some (select b from t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= some (select b from t2 group by 1);
a
explain extended select * from t3 where NULL >= some (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
insert into t2 values (2,2), (2,1), (3,3), (3,1);
select * from t3 where a > all (select max(b) from t2 group by a);
a
@ -1771,7 +1768,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
3 UNION t1 system NULL NULL NULL NULL 1 100.00
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 select 'e' AS `s1` from dual where <nop>(<in_optimizer>('f',(<min>(select 'e' from dual union select 'e' from dual) < 'f')))
Note 1003 select 'e' AS `s1` from dual where 1
drop table t1;
CREATE TABLE t1 (number char(11) NOT NULL default '') ENGINE=MyISAM CHARSET=latin1;
INSERT INTO t1 VALUES ('69294728265'),('18621828126'),('89356874041'),('95895001874');
@ -3105,8 +3102,8 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system PRIMARY NULL NULL NULL 1
1 PRIMARY r eq_ref PRIMARY PRIMARY 4 const 1 Using where
2 DEPENDENT SUBQUERY t2 range b b 40 NULL 2 Using where
1 PRIMARY r const PRIMARY PRIMARY 4 const 1
2 SUBQUERY t2 range b b 40 NULL 2 Using where
SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
@ -3117,8 +3114,8 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system PRIMARY NULL NULL NULL 1
1 PRIMARY r eq_ref PRIMARY PRIMARY 4 const 1 Using where
2 DEPENDENT SUBQUERY t2 range b b 40 NULL 2 Using index condition
1 PRIMARY r const PRIMARY PRIMARY 4 const 1
2 SUBQUERY t2 range b b 40 NULL 2 Using index condition
SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
@ -3169,7 +3166,7 @@ INSERT INTO t2 VALUES (1),(2),(3);
EXPLAIN SELECT a, a IN (SELECT a FROM t1) FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 3
2 DEPENDENT SUBQUERY t1 index_subquery a a 5 func 2 Using index; Full scan on NULL key
2 SUBQUERY t1 index_subquery a a 5 func 2 Using index; Full scan on NULL key
SELECT a, a IN (SELECT a FROM t1) FROM t2;
a a IN (SELECT a FROM t1)
1 1
@ -3703,7 +3700,7 @@ ORDER BY t1.t DESC LIMIT 1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
1 PRIMARY t1 index NULL PRIMARY 16 NULL 11 Using where; Using index
2 DEPENDENT SUBQUERY t1 range PRIMARY PRIMARY 16 NULL 5 Using where; Using index
2 SUBQUERY t1 range PRIMARY PRIMARY 16 NULL 5 Using where; Using index
SELECT * FROM t1,t2
WHERE t1.t = (SELECT t1.t FROM t1
WHERE t1.t < t2.t AND t1.i2=1 AND t2.i1=t1.i1
@ -3731,8 +3728,8 @@ explain select * from t1 where not exists
((select t11.i from t1 t11) union (select t12.i from t1 t12));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY t11 system NULL NULL NULL NULL 0 const row not found
3 UNION t12 system NULL NULL NULL NULL 0 const row not found
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
3 UNION NULL NULL NULL NULL NULL NULL NULL no matching row in const table
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
DROP TABLE t1;
CREATE TABLE t1 (a VARCHAR(250), b INT auto_increment, PRIMARY KEY (b));
@ -4202,8 +4199,8 @@ CREATE TABLE t1 (a int, b int, KEY (a));
INSERT INTO t1 VALUES (1,1),(2,1);
EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT COUNT(*) FROM t1 GROUP BY b);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ref a a 5 const 0 Using where; Using index
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using temporary; Using filesort
1 PRIMARY t1 ref a a 5 const 1 Using where; Using index
2 SUBQUERY internal_tmp_table ALL group_key NULL NULL NULL 1 Using temporary; Using filesort
DROP TABLE t1;
CREATE TABLE t1 (id int NOT NULL, st CHAR(2), INDEX idx(id));
INSERT INTO t1 VALUES
@ -4531,13 +4528,13 @@ 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
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary
Warnings:
Note 1003 select 1 AS `1` from `test`.`t1` where <expr_cache><1>(<in_optimizer>(1,<exists>(select min(`test`.`t1`.`a`) from `test`.`t1` group by `test`.`t1`.`a` having (1 = <ref_null_helper>(min(`test`.`t1`.`a`))))))
Note 1003 select 1 AS `1` from `test`.`t1` where 1
EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1 IN (SELECT min(a) FROM t1 WHERE a > 3 GROUP BY a);
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
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00 Using where; Using temporary
Warnings:
Note 1003 select 1 AS `1` from `test`.`t1` where <expr_cache><1>(<in_optimizer>(1,<exists>(select min(`test`.`t1`.`a`) from `test`.`t1` where (`test`.`t1`.`a` > 3) group by `test`.`t1`.`a` having (1 = <ref_null_helper>(min(`test`.`t1`.`a`))))))
Note 1003 select 1 AS `1` from `test`.`t1` where 0
SET join_cache_level=@save_join_cache_level;
DROP TABLE t1;
#
@ -4582,7 +4579,7 @@ FROM t1
WHERE a = 230;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
SELECT MAX(b), (SELECT COUNT(*) FROM st1,st2 WHERE st2.b <= t1.b)
FROM t1
WHERE a = 230;
@ -4628,7 +4625,7 @@ 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
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00
Warnings:
Note 1003 select 1 AS `1` from `test`.`t1` where <nop>(<in_optimizer>(1,((select max(`test`.`t1`.`a1`) from `test`.`t1`) > 1)))
Note 1003 select 1 AS `1` from `test`.`t1` where 1
SELECT 1 FROM t1 WHERE 1 < SOME (SELECT a1 FROM t1);
1
1
@ -5970,7 +5967,7 @@ id select_type table type possible_keys key key_len ref rows Extra
EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 SUBQUERY t1 ref a a 5 const 1 Using index
2 SUBQUERY t1 ref a a 5 const 1
DROP TABLE t1;
#
# BUG#12616253 - WRONG RESULT WITH EXISTS(SUBQUERY) (MISSING ROWS)
@ -6129,7 +6126,7 @@ set optimizer_switch=@tmp_optimizer_switch;
EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 SUBQUERY t1 ref a a 5 const 1 Using index
2 SUBQUERY t1 ref a a 5 const 1
DROP TABLE t1;
#
@ -6541,7 +6538,7 @@ EXPLAIN
SELECT COUNT(f1), (SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(f1), (SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
COUNT(f1) f4
0 NULL
@ -6549,7 +6546,7 @@ EXPLAIN
SELECT COUNT(f1), exists(SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(f1), exists(SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
COUNT(f1) f4
0 0
@ -6588,6 +6585,162 @@ NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
SELECT SUM(a) AS f1, a AS f2 FROM (t1, t2) HAVING f2 >= ALL (SELECT 4 UNION SELECT 5) AND f1 = 7;
f1 f2
drop table t1,t2;
#
# LP BUG#944706 Query with impossible or constant subquery in WHERE or HAVING is not
# precomputed and thus not part of optimization
#
CREATE TABLE t1 ( a VARCHAR(16), KEY (a) );
INSERT INTO t1 VALUES ('Abilene'),('Akron'),('Albany'),('Albuquerque'),('Alexandria'),('Allentown'),
('Amarillo'),('Anaheim'),('Anchorage'),('Ann Arbor'),('Arden-Arcade');
EXPLAIN
SELECT MAX( alias2.a ) AS field
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR alias1.a = 'y'
HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible HAVING
2 SUBQUERY t1 index_subquery a a 19 const 1 Using index; Using where
SELECT MAX( alias2.a ) AS field
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR alias1.a = 'y'
HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
field
EXPLAIN
SELECT MAX( alias2.a )
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 index a a 19 NULL 11 Using where; Using index
1 PRIMARY alias2 ref a a 19 test.alias1.a 2 Using index
1 PRIMARY alias3 index NULL a 19 NULL 11 Using index; Using join buffer (flat, BNL join)
2 SUBQUERY t1 index_subquery a a 19 const 1 Using index; Using where
SELECT MAX( alias2.a )
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
MAX( alias2.a )
Arden-Arcade
drop table t1;
#
# MDEV-277 CHEAP SQ: Server crashes in st_join_table::get_examined_rows
# with semijoin+materialization, IN and = subqueries
#
CREATE TABLE t1 (a1 INT);
INSERT INTO t1 VALUES (4),(6);
CREATE TABLE t2 (b1 INT);
INSERT INTO t2 VALUES (1),(7);
EXPLAIN
SELECT * FROM t1
WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where; Start temporary; Using join buffer (flat, BNL join)
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 End temporary; Using join buffer (flat, BNL join)
SELECT * FROM t1
WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
a1
drop table t1, t2;
#
# MDEV-287 CHEAP SQ: A query with subquery in SELECT list, EXISTS,
# inner joins takes hundreds times longer
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(7);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (4),(5);
CREATE TABLE t3 (c INT);
INSERT INTO t3 VALUES (8),(3);
set @@expensive_subquery_limit= 0;
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 ALL NULL NULL NULL NULL 2
1 PRIMARY alias2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
1 PRIMARY alias3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t3 ALL NULL NULL NULL NULL 2
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
(SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 2
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 8
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 22
set @@expensive_subquery_limit= default;
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 ALL NULL NULL NULL NULL 2
1 PRIMARY alias2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
1 PRIMARY alias3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t3 ALL NULL NULL NULL NULL 2
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
(SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 16
drop table t1, t2, t3;
#
# MDEV-288 CHEAP SQ: Valgrind warnings "Memory lost" with IN and EXISTS nested subquery, materialization+semijoin
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (0),(8);
CREATE TABLE t2 (b INT PRIMARY KEY);
INSERT INTO t2 VALUES (1),(2);
EXPLAIN
SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
3 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
a
drop table t1,t2;
# return optimizer switch changed in the beginning of this test
set optimizer_switch=@subselect_tmp;
set optimizer_switch=default;

246
mysql-test/r/subselect_no_opts.result
View file

@ -54,7 +54,7 @@ ERROR 42S22: Reference 'a' not supported (forward reference in item list)
EXPLAIN EXTENDED SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived2> system NULL NULL NULL NULL 1 100.00
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1276 Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1
@ -374,12 +374,12 @@ INSERT INTO t8 (pseudo,email) VALUES ('joce1','test1');
INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1');
EXPLAIN EXTENDED SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using where; Using index
1 PRIMARY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
4 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
2 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using where
2 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00
3 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
Warnings:
Note 1003 select `test`.`t8`.`pseudo` AS `pseudo`,(select `test`.`t8`.`email` from `test`.`t8` where (`test`.`t8`.`pseudo` = (select 'joce' from `test`.`t8` where 1))) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where (`test`.`t8`.`pseudo` = (select 'joce' from `test`.`t8` where 1))
Note 1003 select 'joce' AS `pseudo`,(select 'test' from `test`.`t8` where 1) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where 1
SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM
t8 WHERE pseudo='joce');
ERROR 21000: Operand should contain 1 column(s)
@ -520,6 +520,7 @@ ERROR 21000: Subquery returns more than 1 row
show warnings;
Level Code Message
Error 1242 Subquery returns more than 1 row
Error 1028 Sort aborted: Subquery returns more than 1 row
drop table t1;
create table t1 (a int);
insert into t1 values (1),(2),(3);
@ -550,11 +551,7 @@ SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=1) FROM (SELECT
numreponse (SELECT numeropost FROM t1 HAVING numreponse=1)
INSERT INTO t1 (numeropost,numreponse,pseudo) VALUES (1,1,'joce'),(1,2,'joce'),(1,3,'test');
EXPLAIN EXTENDED SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 const PRIMARY,numreponse PRIMARY 7 const,const 1 100.00 Using where; Using index
2 SUBQUERY t1 ref PRIMARY PRIMARY 3 const 2 100.00 Using index
Warnings:
Note 1003 select `test`.`t1`.`numreponse` AS `numreponse` from `test`.`t1` where ((`test`.`t1`.`numeropost` = '1') and (`test`.`t1`.`numreponse` = (select 1 from `test`.`t1` where (`test`.`t1`.`numeropost` = '1'))))
ERROR 21000: Subquery returns more than 1 row
SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
ERROR 21000: Subquery returns more than 1 row
EXPLAIN EXTENDED SELECT MAX(numreponse) FROM t1 WHERE numeropost='1';
@ -910,7 +907,7 @@ a t1.a in (select t2.a from t2)
explain extended SELECT t1.a, t1.a in (select t2.a from t2) FROM t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL PRIMARY 4 NULL 4 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery a a 5 func 2 100.00 Using index
2 SUBQUERY t2 index_subquery a a 5 func 2 100.00 Using index
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a`,<in_optimizer>(`test`.`t1`.`a`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`a`) in t2 on a checking NULL having <is_not_null_test>(`test`.`t2`.`a`)))) AS `t1.a in (select t2.a from t2)` from `test`.`t1`
CREATE TABLE t3 (a int(11) default '0');
@ -1611,25 +1608,25 @@ a3 1
explain extended select s1, s1 NOT IN (SELECT s1 FROM t2) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,(not(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`))))))) AS `s1 NOT IN (SELECT s1 FROM t2)` from `test`.`t1`
explain extended select s1, s1 = ANY (SELECT s1 FROM t2) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`))))) AS `s1 = ANY (SELECT s1 FROM t2)` from `test`.`t1`
explain extended select s1, s1 <> ALL (SELECT s1 FROM t2) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,(not(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`))))))) AS `s1 <> ALL (SELECT s1 FROM t2)` from `test`.`t1`
explain extended select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Using where; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Using where; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,(not(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL where (`test`.`t2`.`s1` < 'a2') having trigcond(<is_not_null_test>(`test`.`t2`.`s1`))))))) AS `s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2')` from `test`.`t1`
drop table t1,t2;
@ -1678,34 +1675,34 @@ select * from t3 where NULL >= any (select b from t2);
a
explain extended select * from t3 where NULL >= any (select b from t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= any (select b from t2 group by 1);
a
explain extended select * from t3 where NULL >= any (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= some (select b from t2);
a
explain extended select * from t3 where NULL >= some (select b from t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= some (select b from t2 group by 1);
a
explain extended select * from t3 where NULL >= some (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
insert into t2 values (2,2), (2,1), (3,3), (3,1);
select * from t3 where a > all (select max(b) from t2 group by a);
a
@ -1767,7 +1764,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
3 UNION t1 system NULL NULL NULL NULL 1 100.00
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 select 'e' AS `s1` from dual where <nop>(<in_optimizer>('f',(<min>(select 'e' from dual union select 'e' from dual) < 'f')))
Note 1003 select 'e' AS `s1` from dual where 1
drop table t1;
CREATE TABLE t1 (number char(11) NOT NULL default '') ENGINE=MyISAM CHARSET=latin1;
INSERT INTO t1 VALUES ('69294728265'),('18621828126'),('89356874041'),('95895001874');
@ -3101,8 +3098,8 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system PRIMARY NULL NULL NULL 1
1 PRIMARY r eq_ref PRIMARY PRIMARY 4 const 1 Using where
2 DEPENDENT SUBQUERY t2 range b b 40 NULL 2 Using where
1 PRIMARY r const PRIMARY PRIMARY 4 const 1
2 SUBQUERY t2 range b b 40 NULL 2 Using where
SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
@ -3113,8 +3110,8 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system PRIMARY NULL NULL NULL 1
1 PRIMARY r eq_ref PRIMARY PRIMARY 4 const 1 Using where
2 DEPENDENT SUBQUERY t2 range b b 40 NULL 2 Using index condition
1 PRIMARY r const PRIMARY PRIMARY 4 const 1
2 SUBQUERY t2 range b b 40 NULL 2 Using index condition
SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
@ -3165,7 +3162,7 @@ INSERT INTO t2 VALUES (1),(2),(3);
EXPLAIN SELECT a, a IN (SELECT a FROM t1) FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 3
2 DEPENDENT SUBQUERY t1 index_subquery a a 5 func 2 Using index; Full scan on NULL key
2 SUBQUERY t1 index_subquery a a 5 func 2 Using index; Full scan on NULL key
SELECT a, a IN (SELECT a FROM t1) FROM t2;
a a IN (SELECT a FROM t1)
1 1
@ -3699,7 +3696,7 @@ ORDER BY t1.t DESC LIMIT 1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
1 PRIMARY t1 index NULL PRIMARY 16 NULL 11 Using where; Using index
2 DEPENDENT SUBQUERY t1 range PRIMARY PRIMARY 16 NULL 5 Using where; Using index
2 SUBQUERY t1 range PRIMARY PRIMARY 16 NULL 5 Using where; Using index
SELECT * FROM t1,t2
WHERE t1.t = (SELECT t1.t FROM t1
WHERE t1.t < t2.t AND t1.i2=1 AND t2.i1=t1.i1
@ -3727,8 +3724,8 @@ explain select * from t1 where not exists
((select t11.i from t1 t11) union (select t12.i from t1 t12));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY t11 system NULL NULL NULL NULL 0 const row not found
3 UNION t12 system NULL NULL NULL NULL 0 const row not found
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
3 UNION NULL NULL NULL NULL NULL NULL NULL no matching row in const table
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
DROP TABLE t1;
CREATE TABLE t1 (a VARCHAR(250), b INT auto_increment, PRIMARY KEY (b));
@ -4198,8 +4195,8 @@ CREATE TABLE t1 (a int, b int, KEY (a));
INSERT INTO t1 VALUES (1,1),(2,1);
EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT COUNT(*) FROM t1 GROUP BY b);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ref a a 5 const 0 Using where; Using index
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using temporary; Using filesort
1 PRIMARY t1 ref a a 5 const 1 Using where; Using index
2 SUBQUERY internal_tmp_table ALL group_key NULL NULL NULL 1 Using temporary; Using filesort
DROP TABLE t1;
CREATE TABLE t1 (id int NOT NULL, st CHAR(2), INDEX idx(id));
INSERT INTO t1 VALUES
@ -4527,13 +4524,13 @@ 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
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary
Warnings:
Note 1003 select 1 AS `1` from `test`.`t1` where <in_optimizer>(1,<exists>(select min(`test`.`t1`.`a`) from `test`.`t1` group by `test`.`t1`.`a` having (1 = <ref_null_helper>(min(`test`.`t1`.`a`)))))
Note 1003 select 1 AS `1` from `test`.`t1` where 1
EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1 IN (SELECT min(a) FROM t1 WHERE a > 3 GROUP BY a);
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
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00 Using where; Using temporary
Warnings:
Note 1003 select 1 AS `1` from `test`.`t1` where <in_optimizer>(1,<exists>(select min(`test`.`t1`.`a`) from `test`.`t1` where (`test`.`t1`.`a` > 3) group by `test`.`t1`.`a` having (1 = <ref_null_helper>(min(`test`.`t1`.`a`)))))
Note 1003 select 1 AS `1` from `test`.`t1` where 0
SET join_cache_level=@save_join_cache_level;
DROP TABLE t1;
#
@ -4578,7 +4575,7 @@ FROM t1
WHERE a = 230;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
SELECT MAX(b), (SELECT COUNT(*) FROM st1,st2 WHERE st2.b <= t1.b)
FROM t1
WHERE a = 230;
@ -4624,7 +4621,7 @@ 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
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00
Warnings:
Note 1003 select 1 AS `1` from `test`.`t1` where <nop>(<in_optimizer>(1,((select max(`test`.`t1`.`a1`) from `test`.`t1`) > 1)))
Note 1003 select 1 AS `1` from `test`.`t1` where 1
SELECT 1 FROM t1 WHERE 1 < SOME (SELECT a1 FROM t1);
1
1
@ -5966,7 +5963,7 @@ id select_type table type possible_keys key key_len ref rows Extra
EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 SUBQUERY t1 ref a a 5 const 1 Using index
2 SUBQUERY t1 ref a a 5 const 1
DROP TABLE t1;
#
# BUG#12616253 - WRONG RESULT WITH EXISTS(SUBQUERY) (MISSING ROWS)
@ -6125,7 +6122,7 @@ set optimizer_switch=@tmp_optimizer_switch;
EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 SUBQUERY t1 ref a a 5 const 1 Using index
2 SUBQUERY t1 ref a a 5 const 1
DROP TABLE t1;
#
@ -6537,7 +6534,7 @@ EXPLAIN
SELECT COUNT(f1), (SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(f1), (SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
COUNT(f1) f4
0 NULL
@ -6545,7 +6542,7 @@ EXPLAIN
SELECT COUNT(f1), exists(SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(f1), exists(SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
COUNT(f1) f4
0 0
@ -6584,6 +6581,163 @@ NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
SELECT SUM(a) AS f1, a AS f2 FROM (t1, t2) HAVING f2 >= ALL (SELECT 4 UNION SELECT 5) AND f1 = 7;
f1 f2
drop table t1,t2;
#
# LP BUG#944706 Query with impossible or constant subquery in WHERE or HAVING is not
# precomputed and thus not part of optimization
#
CREATE TABLE t1 ( a VARCHAR(16), KEY (a) );
INSERT INTO t1 VALUES ('Abilene'),('Akron'),('Albany'),('Albuquerque'),('Alexandria'),('Allentown'),
('Amarillo'),('Anaheim'),('Anchorage'),('Ann Arbor'),('Arden-Arcade');
EXPLAIN
SELECT MAX( alias2.a ) AS field
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR alias1.a = 'y'
HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible HAVING
2 SUBQUERY t1 index_subquery a a 19 const 1 Using index; Using where
SELECT MAX( alias2.a ) AS field
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR alias1.a = 'y'
HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
field
EXPLAIN
SELECT MAX( alias2.a )
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 index a a 19 NULL 11 Using where; Using index
1 PRIMARY alias2 ref a a 19 test.alias1.a 2 Using index
1 PRIMARY alias3 index NULL a 19 NULL 11 Using index; Using join buffer (flat, BNL join)
2 SUBQUERY t1 index_subquery a a 19 const 1 Using index; Using where
SELECT MAX( alias2.a )
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
MAX( alias2.a )
Arden-Arcade
drop table t1;
#
# MDEV-277 CHEAP SQ: Server crashes in st_join_table::get_examined_rows
# with semijoin+materialization, IN and = subqueries
#
CREATE TABLE t1 (a1 INT);
INSERT INTO t1 VALUES (4),(6);
CREATE TABLE t2 (b1 INT);
INSERT INTO t2 VALUES (1),(7);
EXPLAIN
SELECT * FROM t1
WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY <subquery3> eq_ref distinct_key distinct_key 4 func 1
3 MATERIALIZED t1 ALL NULL NULL NULL NULL 2
3 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
SELECT * FROM t1
WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
a1
drop table t1, t2;
#
# MDEV-287 CHEAP SQ: A query with subquery in SELECT list, EXISTS,
# inner joins takes hundreds times longer
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(7);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (4),(5);
CREATE TABLE t3 (c INT);
INSERT INTO t3 VALUES (8),(3);
set @@expensive_subquery_limit= 0;
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 ALL NULL NULL NULL NULL 2
1 PRIMARY alias2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
1 PRIMARY alias3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t3 ALL NULL NULL NULL NULL 2
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
(SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 2
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 8
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 22
set @@expensive_subquery_limit= default;
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 ALL NULL NULL NULL NULL 2
1 PRIMARY alias2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
1 PRIMARY alias3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t3 ALL NULL NULL NULL NULL 2
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
(SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 16
drop table t1, t2, t3;
#
# MDEV-288 CHEAP SQ: Valgrind warnings "Memory lost" with IN and EXISTS nested subquery, materialization+semijoin
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (0),(8);
CREATE TABLE t2 (b INT PRIMARY KEY);
INSERT INTO t2 VALUES (1),(2);
EXPLAIN
SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
3 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
a
drop table t1,t2;
# return optimizer switch changed in the beginning of this test
set optimizer_switch=@subselect_tmp;
set @optimizer_switch_for_subselect_test=null;

240
mysql-test/r/subselect_no_scache.result
View file

@ -57,7 +57,7 @@ ERROR 42S22: Reference 'a' not supported (forward reference in item list)
EXPLAIN EXTENDED SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived2> system NULL NULL NULL NULL 1 100.00
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1276 Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1
@ -377,12 +377,12 @@ INSERT INTO t8 (pseudo,email) VALUES ('joce1','test1');
INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1');
EXPLAIN EXTENDED SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using where; Using index
1 PRIMARY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
4 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
2 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using where
2 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00
3 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
Warnings:
Note 1003 select `test`.`t8`.`pseudo` AS `pseudo`,(select `test`.`t8`.`email` from `test`.`t8` where (`test`.`t8`.`pseudo` = (select 'joce' from `test`.`t8` where 1))) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where (`test`.`t8`.`pseudo` = (select 'joce' from `test`.`t8` where 1))
Note 1003 select 'joce' AS `pseudo`,(select 'test' from `test`.`t8` where 1) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where 1
SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM
t8 WHERE pseudo='joce');
ERROR 21000: Operand should contain 1 column(s)
@ -523,6 +523,7 @@ ERROR 21000: Subquery returns more than 1 row
show warnings;
Level Code Message
Error 1242 Subquery returns more than 1 row
Error 1028 Sort aborted: Subquery returns more than 1 row
drop table t1;
create table t1 (a int);
insert into t1 values (1),(2),(3);
@ -553,11 +554,7 @@ SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=1) FROM (SELECT
numreponse (SELECT numeropost FROM t1 HAVING numreponse=1)
INSERT INTO t1 (numeropost,numreponse,pseudo) VALUES (1,1,'joce'),(1,2,'joce'),(1,3,'test');
EXPLAIN EXTENDED SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 const PRIMARY,numreponse PRIMARY 7 const,const 1 100.00 Using where; Using index
2 SUBQUERY t1 ref PRIMARY PRIMARY 3 const 2 100.00 Using index
Warnings:
Note 1003 select `test`.`t1`.`numreponse` AS `numreponse` from `test`.`t1` where ((`test`.`t1`.`numeropost` = '1') and (`test`.`t1`.`numreponse` = (select 1 from `test`.`t1` where (`test`.`t1`.`numeropost` = '1'))))
ERROR 21000: Subquery returns more than 1 row
SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
ERROR 21000: Subquery returns more than 1 row
EXPLAIN EXTENDED SELECT MAX(numreponse) FROM t1 WHERE numeropost='1';
@ -913,7 +910,7 @@ a t1.a in (select t2.a from t2)
explain extended SELECT t1.a, t1.a in (select t2.a from t2) FROM t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL PRIMARY 4 NULL 4 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery a a 5 func 2 100.00 Using index
2 SUBQUERY t2 index_subquery a a 5 func 2 100.00 Using index
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a`,<in_optimizer>(`test`.`t1`.`a`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`a`) in t2 on a checking NULL having <is_not_null_test>(`test`.`t2`.`a`)))) AS `t1.a in (select t2.a from t2)` from `test`.`t1`
CREATE TABLE t3 (a int(11) default '0');
@ -1614,25 +1611,25 @@ a3 1
explain extended select s1, s1 NOT IN (SELECT s1 FROM t2) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,(not(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`))))))) AS `s1 NOT IN (SELECT s1 FROM t2)` from `test`.`t1`
explain extended select s1, s1 = ANY (SELECT s1 FROM t2) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`))))) AS `s1 = ANY (SELECT s1 FROM t2)` from `test`.`t1`
explain extended select s1, s1 <> ALL (SELECT s1 FROM t2) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,(not(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`))))))) AS `s1 <> ALL (SELECT s1 FROM t2)` from `test`.`t1`
explain extended select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index
2 DEPENDENT SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Using where; Full scan on NULL key
2 SUBQUERY t2 index_subquery s1 s1 6 func 2 100.00 Using index; Using where; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`s1` AS `s1`,(not(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL where (`test`.`t2`.`s1` < 'a2') having trigcond(<is_not_null_test>(`test`.`t2`.`s1`))))))) AS `s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2')` from `test`.`t1`
drop table t1,t2;
@ -1681,34 +1678,34 @@ select * from t3 where NULL >= any (select b from t2);
a
explain extended select * from t3 where NULL >= any (select b from t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= any (select b from t2 group by 1);
a
explain extended select * from t3 where NULL >= any (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= some (select b from t2);
a
explain extended select * from t3 where NULL >= some (select b from t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= some (select b from t2 group by 1);
a
explain extended select * from t3 where NULL >= some (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
insert into t2 values (2,2), (2,1), (3,3), (3,1);
select * from t3 where a > all (select max(b) from t2 group by a);
a
@ -1770,7 +1767,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
3 UNION t1 system NULL NULL NULL NULL 1 100.00
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 select 'e' AS `s1` from dual where <nop>(<in_optimizer>('f',(<min>(select 'e' from dual union select 'e' from dual) < 'f')))
Note 1003 select 'e' AS `s1` from dual where 1
drop table t1;
CREATE TABLE t1 (number char(11) NOT NULL default '') ENGINE=MyISAM CHARSET=latin1;
INSERT INTO t1 VALUES ('69294728265'),('18621828126'),('89356874041'),('95895001874');
@ -3105,8 +3102,8 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system PRIMARY NULL NULL NULL 1
1 PRIMARY r eq_ref PRIMARY PRIMARY 4 const 1 Using where
2 DEPENDENT SUBQUERY t2 range b b 40 NULL 2 Using where
1 PRIMARY r const PRIMARY PRIMARY 4 const 1
2 SUBQUERY t2 range b b 40 NULL 2 Using where
SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
@ -3117,8 +3114,8 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system PRIMARY NULL NULL NULL 1
1 PRIMARY r eq_ref PRIMARY PRIMARY 4 const 1 Using where
2 DEPENDENT SUBQUERY t2 range b b 40 NULL 2 Using index condition
1 PRIMARY r const PRIMARY PRIMARY 4 const 1
2 SUBQUERY t2 range b b 40 NULL 2 Using index condition
SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
@ -3169,7 +3166,7 @@ INSERT INTO t2 VALUES (1),(2),(3);
EXPLAIN SELECT a, a IN (SELECT a FROM t1) FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 3
2 DEPENDENT SUBQUERY t1 index_subquery a a 5 func 2 Using index; Full scan on NULL key
2 SUBQUERY t1 index_subquery a a 5 func 2 Using index; Full scan on NULL key
SELECT a, a IN (SELECT a FROM t1) FROM t2;
a a IN (SELECT a FROM t1)
1 1
@ -3705,7 +3702,7 @@ ORDER BY t1.t DESC LIMIT 1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
1 PRIMARY t1 index NULL PRIMARY 16 NULL 11 Using where; Using index
2 DEPENDENT SUBQUERY t1 range PRIMARY PRIMARY 16 NULL 5 Using where; Using index
2 SUBQUERY t1 range PRIMARY PRIMARY 16 NULL 5 Using where; Using index
SELECT * FROM t1,t2
WHERE t1.t = (SELECT t1.t FROM t1
WHERE t1.t < t2.t AND t1.i2=1 AND t2.i1=t1.i1
@ -3733,8 +3730,8 @@ explain select * from t1 where not exists
((select t11.i from t1 t11) union (select t12.i from t1 t12));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY t11 system NULL NULL NULL NULL 0 const row not found
3 UNION t12 system NULL NULL NULL NULL 0 const row not found
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
3 UNION NULL NULL NULL NULL NULL NULL NULL no matching row in const table
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
DROP TABLE t1;
CREATE TABLE t1 (a VARCHAR(250), b INT auto_increment, PRIMARY KEY (b));
@ -4204,8 +4201,8 @@ CREATE TABLE t1 (a int, b int, KEY (a));
INSERT INTO t1 VALUES (1,1),(2,1);
EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT COUNT(*) FROM t1 GROUP BY b);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ref a a 5 const 0 Using where; Using index
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using temporary; Using filesort
1 PRIMARY t1 ref a a 5 const 1 Using where; Using index
2 SUBQUERY internal_tmp_table ALL group_key NULL NULL NULL 1 Using temporary; Using filesort
DROP TABLE t1;
CREATE TABLE t1 (id int NOT NULL, st CHAR(2), INDEX idx(id));
INSERT INTO t1 VALUES
@ -4586,7 +4583,7 @@ FROM t1
WHERE a = 230;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
SELECT MAX(b), (SELECT COUNT(*) FROM st1,st2 WHERE st2.b <= t1.b)
FROM t1
WHERE a = 230;
@ -4632,7 +4629,7 @@ 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
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00
Warnings:
Note 1003 select 1 AS `1` from `test`.`t1` where <nop>(<in_optimizer>(1,((select max(`test`.`t1`.`a1`) from `test`.`t1`) > 1)))
Note 1003 select 1 AS `1` from `test`.`t1` where 1
SELECT 1 FROM t1 WHERE 1 < SOME (SELECT a1 FROM t1);
1
1
@ -5975,7 +5972,7 @@ id select_type table type possible_keys key key_len ref rows Extra
EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 SUBQUERY t1 ref a a 5 const 1 Using index
2 SUBQUERY t1 ref a a 5 const 1
DROP TABLE t1;
#
# BUG#12616253 - WRONG RESULT WITH EXISTS(SUBQUERY) (MISSING ROWS)
@ -6136,7 +6133,7 @@ set optimizer_switch=@tmp_optimizer_switch;
EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 SUBQUERY t1 ref a a 5 const 1 Using index
2 SUBQUERY t1 ref a a 5 const 1
DROP TABLE t1;
#
@ -6548,7 +6545,7 @@ EXPLAIN
SELECT COUNT(f1), (SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(f1), (SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
COUNT(f1) f4
0 NULL
@ -6556,7 +6553,7 @@ EXPLAIN
SELECT COUNT(f1), exists(SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(f1), exists(SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
COUNT(f1) f4
0 0
@ -6595,6 +6592,163 @@ NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
SELECT SUM(a) AS f1, a AS f2 FROM (t1, t2) HAVING f2 >= ALL (SELECT 4 UNION SELECT 5) AND f1 = 7;
f1 f2
drop table t1,t2;
#
# LP BUG#944706 Query with impossible or constant subquery in WHERE or HAVING is not
# precomputed and thus not part of optimization
#
CREATE TABLE t1 ( a VARCHAR(16), KEY (a) );
INSERT INTO t1 VALUES ('Abilene'),('Akron'),('Albany'),('Albuquerque'),('Alexandria'),('Allentown'),
('Amarillo'),('Anaheim'),('Anchorage'),('Ann Arbor'),('Arden-Arcade');
EXPLAIN
SELECT MAX( alias2.a ) AS field
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR alias1.a = 'y'
HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible HAVING
2 SUBQUERY t1 index_subquery a a 19 const 1 Using index; Using where
SELECT MAX( alias2.a ) AS field
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR alias1.a = 'y'
HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
field
EXPLAIN
SELECT MAX( alias2.a )
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 index a a 19 NULL 11 Using where; Using index
1 PRIMARY alias2 ref a a 19 test.alias1.a 2 Using index
1 PRIMARY alias3 index NULL a 19 NULL 11 Using index; Using join buffer (flat, BNL join)
2 SUBQUERY t1 index_subquery a a 19 const 1 Using index; Using where
SELECT MAX( alias2.a )
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
MAX( alias2.a )
Arden-Arcade
drop table t1;
#
# MDEV-277 CHEAP SQ: Server crashes in st_join_table::get_examined_rows
# with semijoin+materialization, IN and = subqueries
#
CREATE TABLE t1 (a1 INT);
INSERT INTO t1 VALUES (4),(6);
CREATE TABLE t2 (b1 INT);
INSERT INTO t2 VALUES (1),(7);
EXPLAIN
SELECT * FROM t1
WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY <subquery3> eq_ref distinct_key distinct_key 4 func 1
3 MATERIALIZED t1 ALL NULL NULL NULL NULL 2
3 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
SELECT * FROM t1
WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
a1
drop table t1, t2;
#
# MDEV-287 CHEAP SQ: A query with subquery in SELECT list, EXISTS,
# inner joins takes hundreds times longer
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(7);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (4),(5);
CREATE TABLE t3 (c INT);
INSERT INTO t3 VALUES (8),(3);
set @@expensive_subquery_limit= 0;
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 ALL NULL NULL NULL NULL 2
1 PRIMARY alias2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
1 PRIMARY alias3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t3 ALL NULL NULL NULL NULL 2
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
(SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 58
set @@expensive_subquery_limit= default;
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 ALL NULL NULL NULL NULL 2
1 PRIMARY alias2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
1 PRIMARY alias3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t3 ALL NULL NULL NULL NULL 2
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
(SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 16
drop table t1, t2, t3;
#
# MDEV-288 CHEAP SQ: Valgrind warnings "Memory lost" with IN and EXISTS nested subquery, materialization+semijoin
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (0),(8);
CREATE TABLE t2 (b INT PRIMARY KEY);
INSERT INTO t2 VALUES (1),(2);
EXPLAIN
SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
3 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
a
drop table t1,t2;
# return optimizer switch changed in the beginning of this test
set optimizer_switch=@subselect_tmp;
set optimizer_switch=default;

240
mysql-test/r/subselect_no_semijoin.result
View file

@ -54,12 +54,12 @@ ERROR 42S22: Reference 'a' not supported (forward reference in item list)
EXPLAIN EXTENDED SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived2> system NULL NULL NULL NULL 1 100.00
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1276 Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1
Note 1276 Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1
Note 1003 select 1 AS `1` from dual having (<expr_cache><1>((select 1)) = 1)
Note 1003 select 1 AS `1` from dual having ((select 1) = 1)
SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1;
1
1
@ -374,12 +374,12 @@ INSERT INTO t8 (pseudo,email) VALUES ('joce1','test1');
INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1');
EXPLAIN EXTENDED SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using where; Using index
1 PRIMARY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
4 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
2 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using where
2 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00
3 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index
Warnings:
Note 1003 select `test`.`t8`.`pseudo` AS `pseudo`,(select `test`.`t8`.`email` from `test`.`t8` where (`test`.`t8`.`pseudo` = (select 'joce' from `test`.`t8` where 1))) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where (`test`.`t8`.`pseudo` = (select 'joce' from `test`.`t8` where 1))
Note 1003 select 'joce' AS `pseudo`,(select 'test' from `test`.`t8` where 1) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where 1
SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM
t8 WHERE pseudo='joce');
ERROR 21000: Operand should contain 1 column(s)
@ -520,6 +520,7 @@ ERROR 21000: Subquery returns more than 1 row
show warnings;
Level Code Message
Error 1242 Subquery returns more than 1 row
Error 1028 Sort aborted: Subquery returns more than 1 row
drop table t1;
create table t1 (a int);
insert into t1 values (1),(2),(3);
@ -550,11 +551,7 @@ SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=1) FROM (SELECT
numreponse (SELECT numeropost FROM t1 HAVING numreponse=1)
INSERT INTO t1 (numeropost,numreponse,pseudo) VALUES (1,1,'joce'),(1,2,'joce'),(1,3,'test');
EXPLAIN EXTENDED SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 const PRIMARY,numreponse PRIMARY 7 const,const 1 100.00 Using where; Using index
2 SUBQUERY t1 ref PRIMARY PRIMARY 3 const 2 100.00 Using index
Warnings:
Note 1003 select `test`.`t1`.`numreponse` AS `numreponse` from `test`.`t1` where ((`test`.`t1`.`numeropost` = '1') and (`test`.`t1`.`numreponse` = (select 1 from `test`.`t1` where (`test`.`t1`.`numeropost` = '1'))))
ERROR 21000: Subquery returns more than 1 row
SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
ERROR 21000: Subquery returns more than 1 row
EXPLAIN EXTENDED SELECT MAX(numreponse) FROM t1 WHERE numeropost='1';
@ -1678,34 +1675,34 @@ select * from t3 where NULL >= any (select b from t2);
a
explain extended select * from t3 where NULL >= any (select b from t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= any (select b from t2 group by 1);
a
explain extended select * from t3 where NULL >= any (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= some (select b from t2);
a
explain extended select * from t3 where NULL >= some (select b from t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
select * from t3 where NULL >= some (select b from t2 group by 1);
a
explain extended select * from t3 where NULL >= some (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(NULL,((select min(NULL) from `test`.`t2`) <= NULL)))
Note 1003 select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
insert into t2 values (2,2), (2,1), (3,3), (3,1);
select * from t3 where a > all (select max(b) from t2 group by a);
a
@ -1767,7 +1764,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
3 UNION t1 system NULL NULL NULL NULL 1 100.00
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 select 'e' AS `s1` from dual where <nop>(<in_optimizer>('f',(<min>(select 'e' from dual union select 'e' from dual) < 'f')))
Note 1003 select 'e' AS `s1` from dual where 1
drop table t1;
CREATE TABLE t1 (number char(11) NOT NULL default '') ENGINE=MyISAM CHARSET=latin1;
INSERT INTO t1 VALUES ('69294728265'),('18621828126'),('89356874041'),('95895001874');
@ -3101,8 +3098,8 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system PRIMARY NULL NULL NULL 1
1 PRIMARY r eq_ref PRIMARY PRIMARY 4 const 1 Using where
2 DEPENDENT SUBQUERY t2 range b b 40 NULL 2 Using where
1 PRIMARY r const PRIMARY PRIMARY 4 const 1
2 SUBQUERY t2 range b b 40 NULL 2 Using where
SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
@ -3113,8 +3110,8 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system PRIMARY NULL NULL NULL 1
1 PRIMARY r eq_ref PRIMARY PRIMARY 4 const 1 Using where
2 DEPENDENT SUBQUERY t2 range b b 40 NULL 2 Using index condition
1 PRIMARY r const PRIMARY PRIMARY 4 const 1
2 SUBQUERY t2 range b b 40 NULL 2 Using index condition
SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
@ -3699,7 +3696,7 @@ ORDER BY t1.t DESC LIMIT 1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
1 PRIMARY t1 index NULL PRIMARY 16 NULL 11 Using where; Using index
2 DEPENDENT SUBQUERY t1 range PRIMARY PRIMARY 16 NULL 5 Using where; Using index
2 SUBQUERY t1 range PRIMARY PRIMARY 16 NULL 5 Using where; Using index
SELECT * FROM t1,t2
WHERE t1.t = (SELECT t1.t FROM t1
WHERE t1.t < t2.t AND t1.i2=1 AND t2.i1=t1.i1
@ -3727,8 +3724,8 @@ explain select * from t1 where not exists
((select t11.i from t1 t11) union (select t12.i from t1 t12));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY t11 system NULL NULL NULL NULL 0 const row not found
3 UNION t12 system NULL NULL NULL NULL 0 const row not found
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
3 UNION NULL NULL NULL NULL NULL NULL NULL no matching row in const table
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
DROP TABLE t1;
CREATE TABLE t1 (a VARCHAR(250), b INT auto_increment, PRIMARY KEY (b));
@ -4198,8 +4195,8 @@ CREATE TABLE t1 (a int, b int, KEY (a));
INSERT INTO t1 VALUES (1,1),(2,1);
EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT COUNT(*) FROM t1 GROUP BY b);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ref a a 5 const 0 Using where; Using index
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using temporary; Using filesort
1 PRIMARY t1 ref a a 5 const 1 Using where; Using index
2 SUBQUERY internal_tmp_table ALL group_key NULL NULL NULL 1 Using temporary; Using filesort
DROP TABLE t1;
CREATE TABLE t1 (id int NOT NULL, st CHAR(2), INDEX idx(id));
INSERT INTO t1 VALUES
@ -4525,15 +4522,15 @@ SET join_cache_level=0;
EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1 IN (SELECT min(a) FROM t1 GROUP BY a);
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
2 MATERIALIZED t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary
Warnings:
Note 1003 select 1 AS `1` from `test`.`t1` where <expr_cache><1>(<in_optimizer>(1,1 in ( <materialize> (select min(`test`.`t1`.`a`) from `test`.`t1` group by `test`.`t1`.`a` ), <primary_index_lookup>(1 in <temporary table> on distinct_key where ((1 = `<subquery2>`.`min(a)`))))))
Note 1003 select 1 AS `1` from `test`.`t1` where 1
EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1 IN (SELECT min(a) FROM t1 WHERE a > 3 GROUP BY a);
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
2 MATERIALIZED t1 ALL NULL NULL NULL NULL 2 100.00 Using where; Using temporary
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00 Using where; Using temporary
Warnings:
Note 1003 select 1 AS `1` from `test`.`t1` where <expr_cache><1>(<in_optimizer>(1,1 in ( <materialize> (select min(`test`.`t1`.`a`) from `test`.`t1` where (`test`.`t1`.`a` > 3) group by `test`.`t1`.`a` ), <primary_index_lookup>(1 in <temporary table> on distinct_key where ((1 = `<subquery2>`.`min(a)`))))))
Note 1003 select 1 AS `1` from `test`.`t1` where 0
SET join_cache_level=@save_join_cache_level;
DROP TABLE t1;
#
@ -4578,7 +4575,7 @@ FROM t1
WHERE a = 230;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
SELECT MAX(b), (SELECT COUNT(*) FROM st1,st2 WHERE st2.b <= t1.b)
FROM t1
WHERE a = 230;
@ -4624,7 +4621,7 @@ 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
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00
Warnings:
Note 1003 select 1 AS `1` from `test`.`t1` where <nop>(<in_optimizer>(1,((select max(`test`.`t1`.`a1`) from `test`.`t1`) > 1)))
Note 1003 select 1 AS `1` from `test`.`t1` where 1
SELECT 1 FROM t1 WHERE 1 < SOME (SELECT a1 FROM t1);
1
1
@ -5966,7 +5963,7 @@ id select_type table type possible_keys key key_len ref rows Extra
EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 SUBQUERY t1 ref a a 5 const 1 Using index
2 SUBQUERY t1 ref a a 5 const 1
DROP TABLE t1;
#
# BUG#12616253 - WRONG RESULT WITH EXISTS(SUBQUERY) (MISSING ROWS)
@ -6125,7 +6122,7 @@ set optimizer_switch=@tmp_optimizer_switch;
EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 SUBQUERY t1 ref a a 5 const 1 Using index
2 SUBQUERY t1 ref a a 5 const 1
DROP TABLE t1;
#
@ -6537,7 +6534,7 @@ EXPLAIN
SELECT COUNT(f1), (SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(f1), (SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
COUNT(f1) f4
0 NULL
@ -6545,7 +6542,7 @@ EXPLAIN
SELECT COUNT(f1), exists(SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(f1), exists(SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
COUNT(f1) f4
0 0
@ -6584,6 +6581,163 @@ NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
SELECT SUM(a) AS f1, a AS f2 FROM (t1, t2) HAVING f2 >= ALL (SELECT 4 UNION SELECT 5) AND f1 = 7;
f1 f2
drop table t1,t2;
#
# LP BUG#944706 Query with impossible or constant subquery in WHERE or HAVING is not
# precomputed and thus not part of optimization
#
CREATE TABLE t1 ( a VARCHAR(16), KEY (a) );
INSERT INTO t1 VALUES ('Abilene'),('Akron'),('Albany'),('Albuquerque'),('Alexandria'),('Allentown'),
('Amarillo'),('Anaheim'),('Anchorage'),('Ann Arbor'),('Arden-Arcade');
EXPLAIN
SELECT MAX( alias2.a ) AS field
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR alias1.a = 'y'
HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible HAVING
2 SUBQUERY t1 index_subquery a a 19 const 1 Using index; Using where
SELECT MAX( alias2.a ) AS field
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR alias1.a = 'y'
HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
field
EXPLAIN
SELECT MAX( alias2.a )
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 index a a 19 NULL 11 Using where; Using index
1 PRIMARY alias2 ref a a 19 test.alias1.a 2 Using index
1 PRIMARY alias3 index NULL a 19 NULL 11 Using index; Using join buffer (flat, BNL join)
2 SUBQUERY t1 index_subquery a a 19 const 1 Using index; Using where
SELECT MAX( alias2.a )
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
MAX( alias2.a )
Arden-Arcade
drop table t1;
#
# MDEV-277 CHEAP SQ: Server crashes in st_join_table::get_examined_rows
# with semijoin+materialization, IN and = subqueries
#
CREATE TABLE t1 (a1 INT);
INSERT INTO t1 VALUES (4),(6);
CREATE TABLE t2 (b1 INT);
INSERT INTO t2 VALUES (1),(7);
EXPLAIN
SELECT * FROM t1
WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY <subquery3> eq_ref distinct_key distinct_key 4 func 1
3 MATERIALIZED t1 ALL NULL NULL NULL NULL 2
3 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
SELECT * FROM t1
WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
a1
drop table t1, t2;
#
# MDEV-287 CHEAP SQ: A query with subquery in SELECT list, EXISTS,
# inner joins takes hundreds times longer
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(7);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (4),(5);
CREATE TABLE t3 (c INT);
INSERT INTO t3 VALUES (8),(3);
set @@expensive_subquery_limit= 0;
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 ALL NULL NULL NULL NULL 2
1 PRIMARY alias2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
1 PRIMARY alias3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t3 ALL NULL NULL NULL NULL 2
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
(SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 2
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 8
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 22
set @@expensive_subquery_limit= default;
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 ALL NULL NULL NULL NULL 2
1 PRIMARY alias2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
1 PRIMARY alias3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t3 ALL NULL NULL NULL NULL 2
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
(SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 16
drop table t1, t2, t3;
#
# MDEV-288 CHEAP SQ: Valgrind warnings "Memory lost" with IN and EXISTS nested subquery, materialization+semijoin
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (0),(8);
CREATE TABLE t2 (b INT PRIMARY KEY);
INSERT INTO t2 VALUES (1),(2);
EXPLAIN
SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
3 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
a
drop table t1,t2;
# return optimizer switch changed in the beginning of this test
set optimizer_switch=@subselect_tmp;
set @optimizer_switch_for_subselect_test=null;

18
mysql-test/r/subselect_sj_mat.result
View file

@ -1197,8 +1197,8 @@ set @@optimizer_switch=@optimizer_switch_local_default;
set @@optimizer_switch='materialization=off,in_to_exists=on';
explain select min(a1) from t1 where 7 in (select max(b1) from t2 group by b1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
select min(a1) from t1 where 7 in (select max(b1) from t2 group by b1);
min(a1)
NULL
@ -1206,8 +1206,8 @@ set @@optimizer_switch=@optimizer_switch_local_default;
set @@optimizer_switch='semijoin=off';
explain select min(a1) from t1 where 7 in (select b1 from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
select min(a1) from t1 where 7 in (select b1 from t2);
min(a1)
NULL
@ -1223,8 +1223,8 @@ NULL
# but when we go around MWL#90 code, the problem still shows up:
explain select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
min(a1)
NULL
@ -1971,7 +1971,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
1 PRIMARY t2 index c c 5 NULL 8 Using index
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 8 func,func 1
2 MATERIALIZED s2 ref d d 4 const 1 Using where; Using index
2 MATERIALIZED s2 ref d d 4 const 2 Using where; Using index
2 MATERIALIZED s1 ALL c NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t2 ALL NULL NULL NULL NULL 8
SELECT a, c FROM t1, t2
@ -1991,8 +1991,8 @@ id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
1 PRIMARY t2 index c c 5 NULL 8 Using index
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 8 func,func 1
2 MATERIALIZED s2 ref d d 4 const 1 Using where; Using index
2 MATERIALIZED s1 hash_ALL c #hash#$hj 10 const,test.s2.d 8 Using where; Using join buffer (flat, BNLH join)
2 MATERIALIZED s2 ref d d 4 const 2 Using where; Using index
2 MATERIALIZED s1 hash_ALL c #hash#$hj 5 const 8 Using where; Using join buffer (flat, BNLH join)
3 SUBQUERY t2 ALL NULL NULL NULL NULL 8
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2

1
mysql-test/suite/sys_vars/r/all_vars.result
View file

@ -10,5 +10,6 @@ there should be *no* long test name listed below:
select distinct variable_name as `there should be *no* variables listed below:` from t2
left join t1 on variable_name=test_name where test_name is null;
there should be *no* variables listed below:
expensive_subquery_limit
drop table t1;
drop table t2;

13
mysql-test/t/partition.test
View file

@ -2463,3 +2463,16 @@ INSERT INTO t1 VALUES (6,8,10);
SELECT 1 FROM t1 JOIN t1 AS t2 USING (a);
drop table t1;
--echo #
--echo # LP BUG#1001117 Crash on a simple select that uses a temptable view
--echo # MySQL Bug #12330344 Crash and/or valgrind errors in free_io_cache with join, view,
--echo # partitioned table
--echo #
CREATE TABLE t1(a INT PRIMARY KEY) PARTITION BY LINEAR KEY (a);
CREATE ALGORITHM=TEMPTABLE VIEW vtmp AS
SELECT 1 FROM t1 AS t1_0 JOIN t1 ON t1_0.a LIKE (SELECT 1 FROM t1);
SELECT * FROM vtmp;
DROP VIEW vtmp;
DROP TABLE t1;

112
mysql-test/t/subselect.test
View file

@ -304,6 +304,7 @@ SELECT (SELECT numeropost FROM t1 HAVING numreponse=a),numreponse FROM (SELECT *
SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=a) FROM (SELECT * FROM t1) as a;
SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=1) FROM (SELECT * FROM t1) as a;
INSERT INTO t1 (numeropost,numreponse,pseudo) VALUES (1,1,'joce'),(1,2,'joce'),(1,3,'test');
-- error ER_SUBQUERY_NO_1_ROW
EXPLAIN EXTENDED SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
-- error ER_SUBQUERY_NO_1_ROW
SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
@ -5556,5 +5557,116 @@ SELECT SUM(a) AS f1, a AS f2 FROM (t1, t2) HAVING f2 >= ALL (SELECT 4 UNION SELE
drop table t1,t2;
--echo #
--echo # LP BUG#944706 Query with impossible or constant subquery in WHERE or HAVING is not
--echo # precomputed and thus not part of optimization
--echo #
CREATE TABLE t1 ( a VARCHAR(16), KEY (a) );
INSERT INTO t1 VALUES ('Abilene'),('Akron'),('Albany'),('Albuquerque'),('Alexandria'),('Allentown'),
('Amarillo'),('Anaheim'),('Anchorage'),('Ann Arbor'),('Arden-Arcade');
EXPLAIN
SELECT MAX( alias2.a ) AS field
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR alias1.a = 'y'
HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
SELECT MAX( alias2.a ) AS field
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR alias1.a = 'y'
HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
EXPLAIN
SELECT MAX( alias2.a )
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
SELECT MAX( alias2.a )
FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
drop table t1;
--echo #
--echo # MDEV-277 CHEAP SQ: Server crashes in st_join_table::get_examined_rows
--echo # with semijoin+materialization, IN and = subqueries
--echo #
CREATE TABLE t1 (a1 INT);
INSERT INTO t1 VALUES (4),(6);
CREATE TABLE t2 (b1 INT);
INSERT INTO t2 VALUES (1),(7);
EXPLAIN
SELECT * FROM t1
WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
SELECT * FROM t1
WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
drop table t1, t2;
--echo #
--echo # MDEV-287 CHEAP SQ: A query with subquery in SELECT list, EXISTS,
--echo # inner joins takes hundreds times longer
--echo #
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(7);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (4),(5);
CREATE TABLE t3 (c INT);
INSERT INTO t3 VALUES (8),(3);
set @@expensive_subquery_limit= 0;
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
show status like "subquery_cache%";
show status like '%Handler_read%';
set @@expensive_subquery_limit= default;
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
FROM t2 alias1, t1 alias2, t1 alias3;
show status like "subquery_cache%";
show status like '%Handler_read%';
drop table t1, t2, t3;
--echo #
--echo # MDEV-288 CHEAP SQ: Valgrind warnings "Memory lost" with IN and EXISTS nested subquery, materialization+semijoin
--echo #
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (0),(8);
CREATE TABLE t2 (b INT PRIMARY KEY);
INSERT INTO t2 VALUES (1),(2);
EXPLAIN
SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
drop table t1,t2;
--echo # return optimizer switch changed in the beginning of this test
set optimizer_switch=@subselect_tmp;

8
mysql-test/t/subselect4.test
View file

@ -977,6 +977,14 @@ SELECT * FROM t1 WHERE
FROM t3 AS SQ1_t1 JOIN t3 AS SQ1_t3 ON SQ1_t3.f4
GROUP BY SQ1_t1.f4));
--error ER_SUBQUERY_NO_1_ROW
SELECT * FROM t1 WHERE
(SELECT f2 FROM t2
WHERE f4 <= ALL
(SELECT max(SQ1_t1.f4)
FROM t3 AS SQ1_t1 JOIN t3 AS SQ1_t3 ON SQ1_t3.f4
GROUP BY SQ1_t1.f4));
drop table t1, t2, t3;
--echo #

12
sql/item.h
View file

@ -1395,21 +1395,21 @@ public:
{
return cmp_context == IMPOSSIBLE_RESULT || item->cmp_context == cmp_context;
}
/*
/**
Test whether an expression is expensive to compute. Used during
optimization to avoid computing expensive expressions during this
phase. Also used to force temp tables when sorting on expensive
functions.
TODO:
@todo
Normally we should have a method:
cost Item::execution_cost(),
where 'cost' is either 'double' or some structure of various cost
parameters.
NOTE
This function is now used to prevent evaluation of materialized IN
subquery predicates before it is allowed. grep for
DontEvaluateMaterializedSubqueryTooEarly to see the uses.
@note
This function is now used to prevent evaluation of expensive subquery
predicates during the optimization phase. It also prevents evaluation
of predicates that are not computable at this moment.
*/
virtual bool is_expensive()
{

10
sql/item_cmpfunc.cc
View file

@ -5540,7 +5540,15 @@ void Item_equal::add_const(Item *c, Item *f)
else
{
Item_func_eq *func= new Item_func_eq(c, const_item);
func->set_cmp_func();
if (func->set_cmp_func())
{
/*
Setting a comparison function fails when trying to compare
incompatible charsets. Charset compatibility is checked earlier,
except for constant subqueries where we may do it here.
*/
return;
}
func->quick_fix_field();
cond_false= !func->val_int();
}

4
sql/item_cmpfunc.h
View file

@ -371,9 +371,9 @@ public:
Item_bool_func2(Item *a,Item *b)
:Item_int_func(a,b), cmp(tmp_arg, tmp_arg+1), abort_on_null(FALSE) {}
void fix_length_and_dec();
void set_cmp_func()
int set_cmp_func()
{
cmp.set_cmp_func(this, tmp_arg, tmp_arg+1, TRUE);
return cmp.set_cmp_func(this, tmp_arg, tmp_arg+1, TRUE);
}
optimize_type select_optimize() const { return OPTIMIZE_OP; }
virtual enum Functype rev_functype() const { return UNKNOWN_FUNC; }

2
sql/item_strfunc.h
View file

@ -829,7 +829,7 @@ public:
{
DBUG_ASSERT(args[0]->fixed);
conv_charset= cs;
if (cache_if_const && args[0]->const_item() && !args[0]->with_subselect)
if (cache_if_const && args[0]->const_item() && !args[0]->is_expensive())
{
uint errors= 0;
String tmp, *str= args[0]->val_str(&tmp);

42
sql/item_subselect.cc
View file

@ -523,6 +523,48 @@ void Item_subselect::recalc_used_tables(st_select_lex *new_parent,
*/
}
/**
Determine if a subquery is expensive to execute during query optimization.
@details The cost of execution of a subquery is estimated based on an
estimate of the number of rows the subquery will access during execution.
This measure is used instead of JOIN::read_time, because it is considered
to be much more reliable than the cost estimate.
@return true if the subquery is expensive
@return false otherwise
*/
bool Item_subselect::is_expensive()
{
double examined_rows= 0;
for (SELECT_LEX *sl= unit->first_select(); sl; sl= sl->next_select())
{
JOIN *cur_join= sl->join;
if (!cur_join)
continue;
/* If a subquery is not optimized we cannot estimate its cost. */
if (!cur_join->join_tab)
return true;
if (sl->first_inner_unit())
{
/*
Subqueries that contain subqueries are considered expensive.
@todo: accumulate the cost of subqueries.
*/
return true;
}
examined_rows+= cur_join->get_examined_rows();
}
return (examined_rows > thd->variables.expensive_subquery_limit);
}
bool Item_subselect::walk(Item_processor processor, bool walk_subquery,
uchar *argument)
{

8
sql/item_subselect.h
View file

@ -209,7 +209,7 @@ public:
*/
bool is_evaluated() const;
bool is_uncacheable() const;
bool is_expensive() { return TRUE; }
bool is_expensive();
/*
Used by max/min subquery to initialize value presence registration
@ -235,7 +235,7 @@ public:
@retval TRUE if the predicate is expensive
@retval FALSE otherwise
*/
bool is_expensive_processor(uchar *arg) { return TRUE; }
bool is_expensive_processor(uchar *arg) { return is_expensive(); }
/**
Get the SELECT_LEX structure associated with this Item.
@ -581,6 +581,10 @@ public:
bool fix_fields(THD *thd, Item **ref);
void fix_length_and_dec();
void fix_after_pullout(st_select_lex *new_parent, Item **ref);
bool const_item() const
{
return Item_subselect::const_item() && left_expr->const_item();
}
void update_used_tables();
bool setup_mat_engine();
bool init_left_expr_cache();

47
sql/opt_subselect.cc
View file

@ -4894,7 +4894,43 @@ static void remove_subq_pushed_predicates(JOIN *join, Item **where)
bool JOIN::optimize_unflattened_subqueries()
{
return select_lex->optimize_unflattened_subqueries();
return select_lex->optimize_unflattened_subqueries(false);
}
/**
Optimize all constant subqueries of a query that were not flattened into
a semijoin.
@details
Similar to other constant conditions, constant subqueries can be used in
various constant optimizations. Having optimized constant subqueries before
these constant optimizations, makes it possible to estimate if a subquery
is "cheap" enough to be executed during the optimization phase.
Constant subqueries can be optimized and evaluated independent of the outer
query, therefore if const_only = true, this method can be called early in
the optimization phase of the outer query.
@return Operation status
@retval FALSE success.
@retval TRUE error occurred.
*/
bool JOIN::optimize_constant_subqueries()
{
ulonglong save_options= select_lex->options;
bool res;
/*
Constant subqueries may be executed during the optimization phase.
In EXPLAIN mode the optimizer doesn't initialize many of the data structures
needed for execution. In order to make it possible to execute subqueries
during optimization, constant subqueries must be optimized for execution,
not for EXPLAIN.
*/
select_lex->options&= ~SELECT_DESCRIBE;
res= select_lex->optimize_unflattened_subqueries(true);
select_lex->options= save_options;
return res;
}
@ -5295,7 +5331,14 @@ bool JOIN::choose_subquery_plan(table_map join_tables)
by the IN predicate.
*/
outer_join= unit->outer_select() ? unit->outer_select()->join : NULL;
if (outer_join && outer_join->table_count > 0)
/*
Get the cost of the outer join if:
(1) It has at least one table, and
(2) It has been already optimized (if there is no join_tab, then the
outer join has not been optimized yet).
*/
if (outer_join && outer_join->table_count > 0 && // (1)
outer_join->join_tab) // (2)
{
/*
TODO:

1
sql/sql_class.h
View file

@ -482,6 +482,7 @@ typedef struct system_variables
ulonglong group_concat_max_len;
ha_rows select_limit;
ha_rows max_join_size;
ha_rows expensive_subquery_limit;
ulong auto_increment_increment, auto_increment_offset;
ulong lock_wait_timeout;
ulong join_cache_level;

2
sql/sql_delete.cc
View file

@ -120,7 +120,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
}
/* Apply the IN=>EXISTS transformation to all subqueries and optimize them. */
if (select_lex->optimize_unflattened_subqueries())
if (select_lex->optimize_unflattened_subqueries(false))
DBUG_RETURN(TRUE);
const_cond= (!conds || conds->const_item());

87
sql/sql_lex.cc
View file

@ -3406,7 +3406,23 @@ bool st_select_lex::add_index_hint (THD *thd, char *str, uint length)
}
bool st_select_lex::optimize_unflattened_subqueries()
/**
Optimize all subqueries that have not been flattened into semi-joins.
@details
This functionality is a method of SELECT_LEX instead of JOIN because
SQL statements as DELETE/UPDATE do not have a corresponding JOIN object.
@see JOIN::optimize_unflattened_subqueries
@param const_only Restrict subquery optimization to constant subqueries
@return Operation status
@retval FALSE success.
@retval TRUE error occurred.
*/
bool st_select_lex::optimize_unflattened_subqueries(bool const_only)
{
for (SELECT_LEX_UNIT *un= first_inner_unit(); un; un= un->next_unit())
{
@ -3416,12 +3432,19 @@ bool st_select_lex::optimize_unflattened_subqueries()
{
if (subquery_predicate->substype() == Item_subselect::IN_SUBS)
{
Item_in_subselect *in_subs=(Item_in_subselect*)subquery_predicate;
Item_in_subselect *in_subs= (Item_in_subselect*) subquery_predicate;
if (in_subs->is_jtbm_merged)
continue;
}
if (const_only && !subquery_predicate->const_item())
{
/* Skip non-constant subqueries if the caller asked so. */
continue;
}
bool empty_union_result= true;
bool is_correlated_unit= false;
/*
If the subquery is a UNION, optimize all the subqueries in the UNION. If
there is no UNION, then the loop will execute once for the subquery.
@ -3446,6 +3469,8 @@ bool st_select_lex::optimize_unflattened_subqueries()
inner_join->select_options|= SELECT_DESCRIBE;
}
res= inner_join->optimize();
sl->update_correlated_cache();
is_correlated_unit|= sl->is_correlated;
inner_join->select_options= save_options;
un->thd->lex->current_select= save_select;
if (empty_union_result)
@ -3461,6 +3486,9 @@ bool st_select_lex::optimize_unflattened_subqueries()
}
if (empty_union_result)
subquery_predicate->no_rows_in_result();
if (!is_correlated_unit)
un->uncacheable&= ~UNCACHEABLE_DEPENDENT;
subquery_predicate->is_correlated= is_correlated_unit;
}
}
return FALSE;
@ -3829,6 +3857,61 @@ void SELECT_LEX::update_used_tables()
}
/**
@brief
Update is_correlated cache for this select
@details
*/
void st_select_lex::update_correlated_cache()
{
TABLE_LIST *tl;
List_iterator<TABLE_LIST> ti(leaf_tables);
is_correlated= false;
while ((tl= ti++))
{
if (tl->on_expr)
is_correlated|= test(tl->on_expr->used_tables() & OUTER_REF_TABLE_BIT);
for (TABLE_LIST *embedding= tl->embedding ; embedding ;
embedding= embedding->embedding)
{
if (embedding->on_expr)
is_correlated|= test(embedding->on_expr->used_tables() &
OUTER_REF_TABLE_BIT);
}
}
if (join->conds)
is_correlated|= test(join->conds->used_tables() & OUTER_REF_TABLE_BIT);
if (join->having)
is_correlated|= test(join->having->used_tables() & OUTER_REF_TABLE_BIT);
if (join->tmp_having)
is_correlated|= test(join->tmp_having->used_tables() & OUTER_REF_TABLE_BIT);
Item *item;
List_iterator_fast<Item> it(join->fields_list);
while ((item= it++))
is_correlated|= test(item->used_tables() & OUTER_REF_TABLE_BIT);
for (ORDER *order= group_list.first; order; order= order->next)
is_correlated|= test((*order->item)->used_tables() & OUTER_REF_TABLE_BIT);
if (!master_unit()->is_union())
{
for (ORDER *order= order_list.first; order; order= order->next)
is_correlated|= test((*order->item)->used_tables() & OUTER_REF_TABLE_BIT);
}
if (!is_correlated)
uncacheable&= ~UNCACHEABLE_DEPENDENT;
}
/**
Set the EXPLAIN type for this subquery.
*/

8
sql/sql_lex.h
View file

@ -997,12 +997,7 @@ public:
void clear_index_hints(void) { index_hints= NULL; }
bool is_part_of_union() { return master_unit()->is_union(); }
/*
Optimize all subqueries that have not been flattened into semi-joins.
This functionality is a method of SELECT_LEX instead of JOIN because
some SQL statements as DELETE do not have a corresponding JOIN object.
*/
bool optimize_unflattened_subqueries();
bool optimize_unflattened_subqueries(bool const_only);
/* Set the EXPLAIN type for this subquery. */
void set_explain_type();
bool handle_derived(LEX *lex, uint phases);
@ -1023,6 +1018,7 @@ public:
void mark_as_belong_to_derived(TABLE_LIST *derived);
void increase_derived_records(ha_rows records);
void update_used_tables();
void update_correlated_cache();
void mark_const_derived(bool empty);
bool save_leaf_tables(THD *thd);

186
sql/sql_select.cc
View file

@ -271,6 +271,8 @@ Item_equal *find_item_equal(COND_EQUAL *cond_equal, Field *field,
bool *inherited_fl);
JOIN_TAB *first_depth_first_tab(JOIN* join);
JOIN_TAB *next_depth_first_tab(JOIN* join, JOIN_TAB* tab);
JOIN_TAB *first_breadth_first_tab(JOIN *join);
JOIN_TAB *next_breadth_first_tab(JOIN *join, JOIN_TAB *tab);
/**
This handles SELECT with and without UNION.
@ -987,7 +989,10 @@ JOIN::optimize()
}
eval_select_list_used_tables();
if (optimize_constant_subqueries())
DBUG_RETURN(1);
table_count= select_lex->leaf_tables.elements;
if (setup_ftfuncs(select_lex)) /* should be after having->fix_fields */
@ -1274,6 +1279,12 @@ JOIN::optimize()
{
conds= substitute_for_best_equal_field(NO_PARTICULAR_TAB, conds,
cond_equal, map2table);
if (thd->is_error())
{
error= 1;
DBUG_PRINT("error",("Error from substitute_for_best_equal"));
DBUG_RETURN(1);
}
conds->update_used_tables();
DBUG_EXECUTE("where",
print_where(conds,
@ -1294,6 +1305,12 @@ JOIN::optimize()
*tab->on_expr_ref,
tab->cond_equal,
map2table);
if (thd->is_error())
{
error= 1;
DBUG_PRINT("error",("Error from substitute_for_best_equal"));
DBUG_RETURN(1);
}
(*tab->on_expr_ref)->update_used_tables();
}
}
@ -6614,6 +6631,32 @@ void JOIN::get_prefix_cost_and_fanout(uint n_tables,
}
/**
Estimate the number of rows that query execution will read.
@todo This is a very pessimistic upper bound. Use join selectivity
when available to produce a more realistic number.
*/
double JOIN::get_examined_rows()
{
ha_rows examined_rows;
double prev_fanout= 1;
JOIN_TAB *tab= first_breadth_first_tab(this);
JOIN_TAB *prev_tab= tab;
examined_rows= tab->get_examined_rows();
while ((tab= next_breadth_first_tab(this, tab)))
{
prev_fanout *= prev_tab->records_read;
examined_rows+= tab->get_examined_rows() * prev_fanout;
prev_tab= tab;
}
return examined_rows;
}
/**
Find a good, possibly optimal, query execution plan (QEP) by a possibly
exhaustive search.
@ -8061,36 +8104,15 @@ JOIN::make_simple_join(JOIN *parent, TABLE *temp_table)
row_limit= unit->select_limit_cnt;
do_send_rows= row_limit ? 1 : 0;
join_tab->use_join_cache= FALSE;
join_tab->cache=0; /* No caching */
bzero(join_tab, sizeof(JOIN_TAB));
join_tab->table=temp_table;
join_tab->cache_select= 0;
join_tab->select=0;
join_tab->select_cond= 0; // Avoid valgrind warning
join_tab->set_select_cond(NULL, __LINE__);
join_tab->quick=0;
join_tab->type= JT_ALL; /* Map through all records */
join_tab->keys.init();
join_tab->keys.set_all(); /* test everything in quick */
join_tab->info=0;
join_tab->on_expr_ref=0;
join_tab->last_inner= 0;
join_tab->first_unmatched= 0;
join_tab->ref.key = -1;
join_tab->not_used_in_distinct=0;
join_tab->read_first_record= join_init_read_record;
join_tab->preread_init_done= FALSE;
join_tab->join= this;
join_tab->ref.key_parts= 0;
join_tab->keep_current_rowid= FALSE;
join_tab->flush_weedout_table= join_tab->check_weed_out_table= NULL;
join_tab->do_firstmatch= NULL;
join_tab->loosescan_match_tab= NULL;
join_tab->emb_sj_nest= NULL;
join_tab->pre_idx_push_select_cond= NULL;
join_tab->bush_root_tab= NULL;
join_tab->bush_children= NULL;
join_tab->last_leaf_in_bush= FALSE;
bzero((char*) &join_tab->read_record,sizeof(join_tab->read_record));
temp_table->status=0;
temp_table->null_row=0;
@ -10288,6 +10310,51 @@ double JOIN_TAB::scan_time()
return res;
}
/**
Estimate the number of rows that a an access method will read from a table.
@todo: why not use JOIN_TAB::found_records
*/
ha_rows JOIN_TAB::get_examined_rows()
{
ha_rows examined_rows;
if (select && select->quick)
examined_rows= select->quick->records;
else if (type == JT_NEXT || type == JT_ALL ||
type == JT_HASH || type ==JT_HASH_NEXT)
{
if (limit)
{
/*
@todo This estimate is wrong, a LIMIT query may examine much more rows
than the LIMIT itself.
*/
examined_rows= limit;
}
else
{
if (table->is_filled_at_execution())
examined_rows= records;
else
{
/*
handler->info(HA_STATUS_VARIABLE) has been called in
make_join_statistics()
*/
examined_rows= table->file->stats.records;
}
}
}
else
examined_rows= (ha_rows) records_read;
return examined_rows;
}
/**
Initialize the join_tab before reading.
Currently only derived table/view materialization is done here.
@ -10591,6 +10658,22 @@ void JOIN::cleanup(bool full)
tmp_join->tmp_table_param.save_copy_field= 0;
}
tmp_table_param.cleanup();
if (!join_tab)
{
List_iterator<TABLE_LIST> li(*join_list);
TABLE_LIST *table_ref;
while ((table_ref= li++))
{
if (table_ref->table &&
table_ref->jtbm_subselect &&
table_ref->jtbm_subselect->is_jtbm_const_tab)
{
free_tmp_table(thd, table_ref->table);
table_ref->table= NULL;
}
}
}
}
DBUG_VOID_RETURN;
}
@ -11267,9 +11350,9 @@ static bool check_simple_equality(Item *left_item, Item *right_item,
if (!item)
{
Item_func_eq *eq_item;
if ((eq_item= new Item_func_eq(orig_left_item, orig_right_item)))
if (!(eq_item= new Item_func_eq(orig_left_item, orig_right_item)) ||
eq_item->set_cmp_func())
return FALSE;
eq_item->set_cmp_func();
eq_item->quick_fix_field();
item= eq_item;
}
@ -11362,9 +11445,9 @@ static bool check_row_equality(THD *thd, Item *left_row, Item_row *right_row,
if (!is_converted)
{
Item_func_eq *eq_item;
if (!(eq_item= new Item_func_eq(left_item, right_item)))
if (!(eq_item= new Item_func_eq(left_item, right_item)) ||
eq_item->set_cmp_func())
return FALSE;
eq_item->set_cmp_func();
eq_item->quick_fix_field();
eq_list->push_back(eq_item);
}
@ -12050,9 +12133,8 @@ Item *eliminate_item_equal(COND *cond, COND_EQUAL *upper_levels,
eq_item= new Item_func_eq(field_item->real_item(), head_item);
if (!eq_item)
if (!eq_item || eq_item->set_cmp_func())
return 0;
eq_item->set_cmp_func();
eq_item->quick_fix_field();
}
current_sjm= field_sjm;
@ -12139,7 +12221,7 @@ Item *eliminate_item_equal(COND *cond, COND_EQUAL *upper_levels,
Item_equal::get_first() for details.
@return
The transformed condition
The transformed condition, or NULL in case of error
*/
static COND* substitute_for_best_equal_field(JOIN_TAB *context_tab,
@ -18613,6 +18695,7 @@ check_reverse_order:
tab->ref.key_parts= 0;
if (select_limit < table->file->stats.records)
tab->limit= select_limit;
table->disable_keyread();
}
}
else if (tab->type != JT_ALL)
@ -21354,10 +21437,17 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
}
else
{
TABLE_LIST *real_table= table->pos_in_table_list;
item_list.push_back(new Item_string(real_table->alias,
strlen(real_table->alias),
cs));
TABLE_LIST *real_table= table->pos_in_table_list;
/*
Internal temporary tables have no corresponding table reference
object. Such a table may appear in EXPLAIN when a subquery that needs
a temporary table has been executed, and JOIN::exec replaced the
original JOIN with a plan to access the data in the temp table
(made by JOIN::make_simple_join).
*/
const char *tab_name= real_table ? real_table->alias :
"internal_tmp_table";
item_list.push_back(new Item_string(tab_name, strlen(tab_name), cs));
}
/* "partitions" column */
if (join->thd->lex->describe & DESCRIBE_PARTITIONS)
@ -21515,32 +21605,8 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
}
else
{
ha_rows examined_rows;
if (tab->select && tab->select->quick)
examined_rows= tab->select->quick->records;
else if (tab->type == JT_NEXT || tab->type == JT_ALL || is_hj)
{
if (tab->limit)
examined_rows= tab->limit;
else
{
if (tab->table->is_filled_at_execution())
{
examined_rows= tab->records;
}
else
{
/*
handler->info(HA_STATUS_VARIABLE) has been called in
make_join_statistics()
*/
examined_rows= tab->table->file->stats.records;
}
}
}
else
examined_rows=(ha_rows)tab->records_read;
ha_rows examined_rows= tab->get_examined_rows();
item_list.push_back(new Item_int((longlong) (ulonglong) examined_rows,
MY_INT64_NUM_DECIMAL_DIGITS));

3
sql/sql_select.h
View file

@ -512,6 +512,7 @@ typedef struct st_join_table {
return (is_hash_join_key_no(key) ? hj_key : table->key_info+key);
}
double scan_time();
ha_rows get_examined_rows();
bool preread_init();
bool is_sjm_nest() { return test(bush_children); }
@ -1281,6 +1282,7 @@ public:
bool alloc_func_list();
bool flatten_subqueries();
bool optimize_unflattened_subqueries();
bool optimize_constant_subqueries();
bool make_sum_func_list(List<Item> &all_fields, List<Item> &send_fields,
bool before_group_by, bool recompute= FALSE);
@ -1380,6 +1382,7 @@ public:
void get_prefix_cost_and_fanout(uint n_tables,
double *read_time_arg,
double *record_count_arg);
double get_examined_rows();
/* defined in opt_subselect.cc */
bool transform_max_min_subquery();
/* True if this JOIN is a subquery under an IN predicate. */

2
sql/sql_update.cc
View file

@ -368,7 +368,7 @@ int mysql_update(THD *thd,
}
/* Apply the IN=>EXISTS transformation to all subqueries and optimize them. */
if (select_lex->optimize_unflattened_subqueries())
if (select_lex->optimize_unflattened_subqueries(false))
DBUG_RETURN(TRUE);
if (select_lex->inner_refs_list.elements &&

7
sql/sys_vars.cc
View file

@ -3768,4 +3768,9 @@ static Sys_var_ulong Sys_debug_binlog_fsync_sleep(
CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, UINT_MAX), DEFAULT(0), BLOCK_SIZE(1));
#endif
static Sys_var_harows Sys_expensive_subquery_limit(
"expensive_subquery_limit",
"The maximum number of rows a subquery may examine in order to be "
"executed during optimization and used for constant optimization",
SESSION_VAR(expensive_subquery_limit), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, HA_POS_ERROR), DEFAULT(100), BLOCK_SIZE(1));

8
sql/table.cc
View file

@ -5985,7 +5985,13 @@ void TABLE::use_index(int key_to_save)
bool TABLE::is_filled_at_execution()
{
return test(pos_in_table_list->jtbm_subselect ||
/*
pos_in_table_list == NULL for internal temporary tables because they
do not have a corresponding table reference. Such tables are filled
during execution.
*/
return test(!pos_in_table_list ||
pos_in_table_list->jtbm_subselect ||
pos_in_table_list->is_active_sjm());
}