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Bug#23800: Outer fields in correlated subqueries is used in a temporary table
created for sorting. Any outer reference in a subquery was represented by an Item_field object. If the outer select employs a temporary table all such fields should be replaced with fields from that temporary table in order to point to the actual data. This replacement wasn't done and that resulted in a wrong subquery evaluation and a wrong result of the whole query. Now any outer field is represented by two objects - Item_field placed in the outer select and Item_outer_ref in the subquery. Item_field object is processed as a normal field and the reference to it is saved in the ref_pointer_array. Thus the Item_outer_ref is always references the correct field. The original field is substituted for a reference in the Item_field::fix_outer_field() function. New function called fix_inner_refs() is added to fix fields referenced from inner selects and to fix references (Item_ref objects) to these fields. The new Item_outer_ref class is a descendant of the Item_direct_ref class. It additionally stores a reference to the original field and designed to behave more like a field.
This commit is contained in:
evgen@moonbone.local
@ -224,7 +224,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2
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3 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 3 Using where
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Warnings:
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Note 1276 Field or reference 't4.a' of SELECT #3 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t4.a' of SELECT #3 was resolved in SELECT #1
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Note 1003 select `test`.`t4`.`b` AS `b`,(select avg((`test`.`t2`.`a` + (select min(`test`.`t3`.`a`) AS `min(t3.a)` from `test`.`t3` where (`test`.`t3`.`a` >= `test`.`t4`.`a`)))) AS `avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a))` from `test`.`t2`) AS `(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2)` from `test`.`t4`
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select * from t3 where exists (select * from t2 where t2.b=t3.a);
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a
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@ -313,8 +313,8 @@ id select_type table type possible_keys key key_len ref rows Extra
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3 DEPENDENT UNION t5 ALL NULL NULL NULL NULL 2 Using where
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
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Warnings:
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Note 1276 Field or reference 't2.a' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 't2.a' of SELECT #3 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t2.a' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t2.a' of SELECT #3 was resolved in SELECT #1
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Note 1003 select (select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` = `test`.`t2`.`a`) union select `test`.`t5`.`a` AS `a` from `test`.`t5` where (`test`.`t5`.`a` = `test`.`t2`.`a`)) AS `(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a)`,`test`.`t2`.`a` AS `a` from `test`.`t2`
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select (select a from t1 where t1.a=t2.a union all select a from t5 where t5.a=t2.a), a from t2;
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ERROR 21000: Subquery returns more than 1 row
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@ -330,9 +330,9 @@ patient_uq clinic_uq
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explain extended select * from t6 where exists (select * from t7 where uq = clinic_uq);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t6 ALL NULL NULL NULL NULL 4 Using where
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2 DEPENDENT SUBQUERY t7 eq_ref PRIMARY PRIMARY 4 test.t6.clinic_uq 1 Using index
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2 DEPENDENT SUBQUERY t7 eq_ref PRIMARY PRIMARY 4 t6.clinic_uq 1 Using where; Using index
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Warnings:
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Note 1276 Field or reference 'clinic_uq' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t6.clinic_uq' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t6`.`patient_uq` AS `patient_uq`,`test`.`t6`.`clinic_uq` AS `clinic_uq` from `test`.`t6` where exists(select 1 AS `Not_used` from `test`.`t7` where (`test`.`t7`.`uq` = `test`.`t6`.`clinic_uq`))
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select * from t1 where a= (select a from t2,t4 where t2.b=t4.b);
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ERROR 23000: Column 'a' in field list is ambiguous
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@ -868,7 +868,7 @@ explain extended select (select a+1) from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 3
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Warnings:
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Note 1276 Field or reference 'a' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
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Note 1249 Select 2 was reduced during optimization
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Note 1003 select (`test`.`t1`.`a` + 1) AS `(select a+1)` from `test`.`t1`
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select (select a+1) from t1;
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@ -1741,9 +1741,9 @@ Note 1003 select `test`.`t1`.`id` AS `id`,`test`.`t1`.`text` AS `text` from `tes
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explain extended select * from t1 as tt where not exists (select id from t1 where id < 8 and (id = tt.id or id is null) having id is not null);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY tt ALL NULL NULL NULL NULL 12 Using where
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2 DEPENDENT SUBQUERY t1 eq_ref PRIMARY PRIMARY 4 test.tt.id 1 Using where; Using index
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2 DEPENDENT SUBQUERY t1 eq_ref PRIMARY PRIMARY 4 tt.id 1 Using where; Using index
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Warnings:
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Note 1276 Field or reference 'tt.id' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.tt.id' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`tt`.`id` AS `id`,`test`.`tt`.`text` AS `text` from `test`.`t1` `tt` where (not(exists(select `test`.`t1`.`id` AS `id` from `test`.`t1` where ((`test`.`t1`.`id` < 8) and (`test`.`t1`.`id` = `test`.`tt`.`id`)) having (`test`.`t1`.`id` is not null))))
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insert into t1 (id, text) values (1000, 'text1000'), (1001, 'text1001');
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create table t2 (id int not null, text varchar(20) not null default '', primary key (id));
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@ -2279,7 +2279,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY up ALL NULL NULL NULL NULL 2 Using where
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2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
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Warnings:
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Note 1276 Field or reference 'up.a' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.up.a' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`up`.`a` AS `a`,`test`.`up`.`b` AS `b` from `test`.`t1` `up` where exists(select 1 AS `Not_used` from `test`.`t1` where (`test`.`t1`.`a` = `test`.`up`.`a`))
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drop table t1;
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CREATE TABLE t1 (t1_a int);
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@ -3712,3 +3712,45 @@ bb 2
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cc 3
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dd 1
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DROP TABLE t1,t2,t3;
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CREATE TABLE t1(f1 int);
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CREATE TABLE t2(f2 int, f21 int, f3 timestamp);
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INSERT INTO t1 VALUES (1),(1),(2),(2);
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INSERT INTO t2 VALUES (1,1,"2004-02-29 11:11:11"), (2,2,"2004-02-29 11:11:11");
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SELECT ((SELECT f2 FROM t2 WHERE f21=f1 LIMIT 1) * COUNT(f1)) AS sq FROM t1 GROUP BY f1;
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sq
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2
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4
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SELECT (SELECT SUM(1) FROM t2 ttt GROUP BY t2.f3 LIMIT 1) AS tt FROM t2;
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tt
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2
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2
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PREPARE stmt1 FROM 'SELECT ((SELECT f2 FROM t2 WHERE f21=f1 LIMIT 1) * COUNT(f1)) AS sq FROM t1 GROUP BY f1';
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EXECUTE stmt1;
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sq
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2
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4
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EXECUTE stmt1;
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sq
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2
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4
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DEALLOCATE PREPARE stmt1;
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SELECT f2, AVG(f21),
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(SELECT t.f3 FROM t2 AS t WHERE t2.f2=t.f2 AND t.f3=MAX(t2.f3)) AS test
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FROM t2 GROUP BY f2;
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f2 AVG(f21) test
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1 1.0000 2004-02-29 11:11:11
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2 2.0000 2004-02-29 11:11:11
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DROP TABLE t1,t2;
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CREATE TABLE t1 (a int, b INT, c CHAR(10) NOT NULL);
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INSERT INTO t1 VALUES
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(1,1,'a'), (1,2,'b'), (1,3,'c'), (1,4,'d'), (1,5,'e'),
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(2,1,'f'), (2,2,'g'), (2,3,'h'), (3,4,'i'), (3,3,'j'),
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(3,2,'k'), (3,1,'l'), (1,9,'m');
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SELECT a, MAX(b),
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(SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b)) AS test
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FROM t1 GROUP BY a;
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a MAX(b) test
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1 9 m
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2 3 h
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3 4 i
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DROP TABLE t1;
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@ -29,7 +29,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 5
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2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 Using where; Using temporary; Using filesort
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Warnings:
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Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`oref` AS `oref`,<in_optimizer>(`test`.`t2`.`a`,<exists>(select max(`test`.`t1`.`ie`) AS `max(ie)` from `test`.`t1` where (`test`.`t1`.`oref` = `test`.`t2`.`oref`) group by `test`.`t1`.`grp` having trigcond((<cache>(`test`.`t2`.`a`) = <ref_null_helper>(max(`test`.`t1`.`ie`)))))) AS `Z` from `test`.`t2`
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explain extended
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select a, oref from t2
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@ -38,7 +38,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where
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2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 Using where; Using temporary; Using filesort
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Warnings:
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Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`oref` AS `oref` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,<exists>(select max(`test`.`t1`.`ie`) AS `max(ie)` from `test`.`t1` where (`test`.`t1`.`oref` = `test`.`t2`.`oref`) group by `test`.`t1`.`grp` having (<cache>(`test`.`t2`.`a`) = <ref_null_helper>(max(`test`.`t1`.`ie`)))))
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select a, oref, a in (
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select max(ie) from t1 where oref=t2.oref group by grp union
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@ -91,7 +91,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 4
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2 DEPENDENT SUBQUERY t1 index_subquery a a 5 func 2 Using where; Full scan on NULL key
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Warnings:
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Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`oref` AS `oref`,`test`.`t2`.`a` AS `a`,<in_optimizer>(`test`.`t2`.`a`,<exists>(<index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on a checking NULL where (`test`.`t1`.`oref` = `test`.`t2`.`oref`) having trigcond(<is_not_null_test>(`test`.`t1`.`a`))))) AS `Z` from `test`.`t2`
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flush status;
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select oref, a from t2 where a in (select a from t1 where oref=t2.oref);
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@ -156,7 +156,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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2 DEPENDENT SUBQUERY t1 ref_or_null a a 5 func 4 Using where; Full scan on NULL key
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2 DEPENDENT SUBQUERY t2 ref a a 5 test.t1.b 1 Using where
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Warnings:
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Note 1276 Field or reference 't3.oref' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t3.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t3`.`a` AS `a`,`test`.`t3`.`oref` AS `oref`,<in_optimizer>(`test`.`t3`.`a`,<exists>(select 1 AS `Not_used` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`b`) and (`test`.`t2`.`b` = `test`.`t3`.`oref`) and trigcond(((<cache>(`test`.`t3`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`)))) having trigcond(<is_not_null_test>(`test`.`t1`.`a`)))) AS `Z` from `test`.`t3`
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drop table t1, t2, t3;
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create table t1 (a int NOT NULL, b int NOT NULL, key(a));
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@ -184,7 +184,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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2 DEPENDENT SUBQUERY t1 ref a a 4 func 2 Using where; Full scan on NULL key
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2 DEPENDENT SUBQUERY t2 ref a a 4 test.t1.b 1 Using where
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Warnings:
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Note 1276 Field or reference 't3.oref' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t3.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t3`.`a` AS `a`,`test`.`t3`.`oref` AS `oref`,<in_optimizer>(`test`.`t3`.`a`,<exists>(select 1 AS `Not_used` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`b`) and (`test`.`t2`.`b` = `test`.`t3`.`oref`) and trigcond((<cache>(`test`.`t3`.`a`) = `test`.`t1`.`a`))))) AS `Z` from `test`.`t3`
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drop table t1,t2,t3;
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create table t1 (oref int, grp int);
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@ -240,7 +240,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 2
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2 DEPENDENT SUBQUERY t1 index_subquery a a 5 func 2 Using where; Full scan on NULL key
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Warnings:
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Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`oref` AS `oref`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(<index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on a checking NULL where ((`test`.`t1`.`c` = `test`.`t2`.`oref`) and trigcond(((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`))) and trigcond(((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`b`) or isnull(`test`.`t1`.`b`)))) having (trigcond(<is_not_null_test>(`test`.`t1`.`a`)) and trigcond(<is_not_null_test>(`test`.`t1`.`b`)))))) AS `Z` from `test`.`t2`
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select a,b, oref, (a,b) in (select a,b from t1 where c=t2.oref) Z from t2;
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a b oref Z
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@ -257,7 +257,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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2 DEPENDENT SUBQUERY t1 ref_or_null a a 5 func 2 Using where; Full scan on NULL key
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2 DEPENDENT SUBQUERY t4 ALL NULL NULL NULL NULL 100 Using where
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Warnings:
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Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`oref` AS `oref`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t4` where ((`test`.`t1`.`c` = `test`.`t2`.`oref`) and trigcond(((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`))) and trigcond(((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`b`) or isnull(`test`.`t1`.`b`)))) having (trigcond(<is_not_null_test>(`test`.`t1`.`a`)) and trigcond(<is_not_null_test>(`test`.`t1`.`b`))))) AS `Z` from `test`.`t2`
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select a,b, oref,
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(a,b) in (select a,b from t1,t4 where c=t2.oref) Z
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@ -302,7 +302,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 8 Using where
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2 DEPENDENT SUBQUERY t1 index_subquery idx idx 5 func 4 Using where; Full scan on NULL key
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Warnings:
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Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`oref` AS `oref`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(<index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on idx checking NULL where ((`test`.`t1`.`oref` = `test`.`t2`.`oref`) and trigcond(((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`ie1`) or isnull(`test`.`t1`.`ie1`))) and trigcond(((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`ie2`) or isnull(`test`.`t1`.`ie2`)))) having (trigcond(<is_not_null_test>(`test`.`t1`.`ie1`)) and trigcond(<is_not_null_test>(`test`.`t1`.`ie2`)))))) AS `Z` from `test`.`t2` where ((`test`.`t2`.`b` = 10) and (`test`.`t2`.`a` = 10))
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drop table t1, t2;
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create table t1 (oref char(4), grp int, ie int);
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@ -432,7 +432,7 @@ alter table t1 add index idx(oref,ie);
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explain select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 7
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2 DEPENDENT SUBQUERY t1 ref_or_null idx idx 10 test.t2.oref,func 4 Using where; Using index; Full scan on NULL key
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2 DEPENDENT SUBQUERY t1 ref_or_null idx idx 10 t2.oref,func 4 Using where; Using index; Full scan on NULL key
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select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2;
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oref a Z
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ee NULL NULL
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@ -457,7 +457,7 @@ group by grp having min(ie) > 1) Z
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from t2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 7
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2 DEPENDENT SUBQUERY t1 ref idx idx 5 test.t2.oref 2 Using where; Using temporary; Using filesort
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2 DEPENDENT SUBQUERY t1 ref idx idx 5 t2.oref 2 Using where; Using temporary; Using filesort
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select oref, a,
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a in (select min(ie) from t1 where oref=t2.oref
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group by grp having min(ie) > 1) Z
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@ -572,7 +572,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 7
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2 DEPENDENT SUBQUERY t1 index_subquery idx idx 5 func 4 Using where; Full scan on NULL key
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Warnings:
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Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`oref` AS `oref`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(<index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on idx checking NULL where ((`test`.`t1`.`oref` = `test`.`t2`.`oref`) and trigcond(((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`ie1`) or isnull(`test`.`t1`.`ie1`))) and trigcond(((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`ie2`) or isnull(`test`.`t1`.`ie2`)))) having (trigcond(<is_not_null_test>(`test`.`t1`.`ie1`)) and trigcond(<is_not_null_test>(`test`.`t1`.`ie2`)))))) AS `Z` from `test`.`t2`
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drop table t1,t2;
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create table t1 (oref char(4), grp int, ie int primary key);
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@ -2600,4 +2600,31 @@ SELECT * FROM t1
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UNION
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SELECT c from t2 WHERE c=t1.c);
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DROP TABLE t1,t2,t3;
|
||||
DROP TABLE t1,t2,t3;
|
||||
#
|
||||
# Bug#23800: Outer fields in correlated subqueries is used in a temporary
|
||||
# table created for sorting.
|
||||
#
|
||||
CREATE TABLE t1(f1 int);
|
||||
CREATE TABLE t2(f2 int, f21 int, f3 timestamp);
|
||||
INSERT INTO t1 VALUES (1),(1),(2),(2);
|
||||
INSERT INTO t2 VALUES (1,1,"2004-02-29 11:11:11"), (2,2,"2004-02-29 11:11:11");
|
||||
SELECT ((SELECT f2 FROM t2 WHERE f21=f1 LIMIT 1) * COUNT(f1)) AS sq FROM t1 GROUP BY f1;
|
||||
SELECT (SELECT SUM(1) FROM t2 ttt GROUP BY t2.f3 LIMIT 1) AS tt FROM t2;
|
||||
PREPARE stmt1 FROM 'SELECT ((SELECT f2 FROM t2 WHERE f21=f1 LIMIT 1) * COUNT(f1)) AS sq FROM t1 GROUP BY f1';
|
||||
EXECUTE stmt1;
|
||||
EXECUTE stmt1;
|
||||
DEALLOCATE PREPARE stmt1;
|
||||
SELECT f2, AVG(f21),
|
||||
(SELECT t.f3 FROM t2 AS t WHERE t2.f2=t.f2 AND t.f3=MAX(t2.f3)) AS test
|
||||
FROM t2 GROUP BY f2;
|
||||
DROP TABLE t1,t2;
|
||||
CREATE TABLE t1 (a int, b INT, c CHAR(10) NOT NULL);
|
||||
INSERT INTO t1 VALUES
|
||||
(1,1,'a'), (1,2,'b'), (1,3,'c'), (1,4,'d'), (1,5,'e'),
|
||||
(2,1,'f'), (2,2,'g'), (2,3,'h'), (3,4,'i'), (3,3,'j'),
|
||||
(3,2,'k'), (3,1,'l'), (1,9,'m');
|
||||
SELECT a, MAX(b),
|
||||
(SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b)) AS test
|
||||
FROM t1 GROUP BY a;
|
||||
DROP TABLE t1;
|
||||
|
||||
Reference in New Issue
Block a user