diff options
Diffstat (limited to 'mysql-test/r/subselect_no_scache.result')
| -rw-r--r-- | mysql-test/r/subselect_no_scache.result | 240 |
1 files changed, 197 insertions, 43 deletions
diff --git a/mysql-test/r/subselect_no_scache.result b/mysql-test/r/subselect_no_scache.result index 7fcacfda470..dba1b3f53c0 100644 --- a/mysql-test/r/subselect_no_scache.result +++ b/mysql-test/r/subselect_no_scache.result @@ -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; |