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MDEV-10146: Wrong result (or questionable result and behavior) with aggregate function in uncorrelated SELECT subquery

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When outer reference resolved in a VIEW it still should mark aggregate function resolving border.
This commit is contained in:
Oleksandr Byelkin 2017-07-03 13:35:32 +02:00
parent 23ac2dd2a4
commit a7ed4644a6
7 changed files with 142 additions and 0 deletions
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22
mysql-test/r/subselect.result
View file

@ -7116,3 +7116,25 @@ SELECT * FROM t1 WHERE f2 <= SOME ( SELECT f1 FROM t1 );
f1 f2
foo bar
DROP TABLE t1;
#
# MDEV-10146: Wrong result (or questionable result and behavior)
# with aggregate function in uncorrelated SELECT subquery
#
CREATE TABLE t1 (f1 INT);
CREATE VIEW v1 AS SELECT * FROM t1;
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (f2 int);
INSERT INTO t2 VALUES (3);
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
( SELECT MAX(f1) FROM t2 )
2
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
( SELECT MAX(f1) FROM t2 )
2
INSERT INTO t2 VALUES (4);
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
ERROR 21000: Subquery returns more than 1 row
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
ERROR 21000: Subquery returns more than 1 row
drop view v1;
drop table t1,t2;

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

@ -7113,6 +7113,28 @@ SELECT * FROM t1 WHERE f2 <= SOME ( SELECT f1 FROM t1 );
f1 f2
foo bar
DROP TABLE t1;
#
# MDEV-10146: Wrong result (or questionable result and behavior)
# with aggregate function in uncorrelated SELECT subquery
#
CREATE TABLE t1 (f1 INT);
CREATE VIEW v1 AS SELECT * FROM t1;
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (f2 int);
INSERT INTO t2 VALUES (3);
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
( SELECT MAX(f1) FROM t2 )
2
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
( SELECT MAX(f1) FROM t2 )
2
INSERT INTO t2 VALUES (4);
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
ERROR 21000: Subquery returns more than 1 row
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
ERROR 21000: Subquery returns more than 1 row
drop view v1;
drop table t1,t2;
set optimizer_switch=default;
select @@optimizer_switch like '%materialization=on%';
@@optimizer_switch like '%materialization=on%'

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

@ -7111,4 +7111,26 @@ SELECT * FROM t1 WHERE f2 <= SOME ( SELECT f1 FROM t1 );
f1 f2
foo bar
DROP TABLE t1;
#
# MDEV-10146: Wrong result (or questionable result and behavior)
# with aggregate function in uncorrelated SELECT subquery
#
CREATE TABLE t1 (f1 INT);
CREATE VIEW v1 AS SELECT * FROM t1;
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (f2 int);
INSERT INTO t2 VALUES (3);
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
( SELECT MAX(f1) FROM t2 )
2
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
( SELECT MAX(f1) FROM t2 )
2
INSERT INTO t2 VALUES (4);
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
ERROR 21000: Subquery returns more than 1 row
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
ERROR 21000: Subquery returns more than 1 row
drop view v1;
drop table t1,t2;
set @optimizer_switch_for_subselect_test=null;

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

@ -7122,6 +7122,28 @@ SELECT * FROM t1 WHERE f2 <= SOME ( SELECT f1 FROM t1 );
f1 f2
foo bar
DROP TABLE t1;
#
# MDEV-10146: Wrong result (or questionable result and behavior)
# with aggregate function in uncorrelated SELECT subquery
#
CREATE TABLE t1 (f1 INT);
CREATE VIEW v1 AS SELECT * FROM t1;
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (f2 int);
INSERT INTO t2 VALUES (3);
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
( SELECT MAX(f1) FROM t2 )
2
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
( SELECT MAX(f1) FROM t2 )
2
INSERT INTO t2 VALUES (4);
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
ERROR 21000: Subquery returns more than 1 row
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
ERROR 21000: Subquery returns more than 1 row
drop view v1;
drop table t1,t2;
set optimizer_switch=default;
select @@optimizer_switch like '%subquery_cache=on%';
@@optimizer_switch like '%subquery_cache=on%'

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

@ -7111,5 +7111,27 @@ SELECT * FROM t1 WHERE f2 <= SOME ( SELECT f1 FROM t1 );
f1 f2
foo bar
DROP TABLE t1;
#
# MDEV-10146: Wrong result (or questionable result and behavior)
# with aggregate function in uncorrelated SELECT subquery
#
CREATE TABLE t1 (f1 INT);
CREATE VIEW v1 AS SELECT * FROM t1;
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (f2 int);
INSERT INTO t2 VALUES (3);
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
( SELECT MAX(f1) FROM t2 )
2
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
( SELECT MAX(f1) FROM t2 )
2
INSERT INTO t2 VALUES (4);
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
ERROR 21000: Subquery returns more than 1 row
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
ERROR 21000: Subquery returns more than 1 row
drop view v1;
drop table t1,t2;
set @optimizer_switch_for_subselect_test=null;
set @join_cache_level_for_subselect_test=NULL;

25
mysql-test/t/subselect.test
View file

@ -5998,3 +5998,28 @@ INSERT INTO t1 VALUES ('foo','bar');
SELECT * FROM t1 WHERE f2 >= SOME ( SELECT f1 FROM t1 );
SELECT * FROM t1 WHERE f2 <= SOME ( SELECT f1 FROM t1 );
DROP TABLE t1;
--echo #
--echo # MDEV-10146: Wrong result (or questionable result and behavior)
--echo # with aggregate function in uncorrelated SELECT subquery
--echo #
CREATE TABLE t1 (f1 INT);
CREATE VIEW v1 AS SELECT * FROM t1;
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (f2 int);
INSERT INTO t2 VALUES (3);
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
INSERT INTO t2 VALUES (4);
--error ER_SUBQUERY_NO_1_ROW
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
--error ER_SUBQUERY_NO_1_ROW
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
drop view v1;
drop table t1,t2;

7
sql/item.cc
View file

@ -5045,6 +5045,13 @@ Item_field::fix_outer_field(THD *thd, Field **from_field, Item **reference)
((ref_type == REF_ITEM || ref_type == FIELD_ITEM) ?
(Item_ident*) (*reference) :
0));
if (thd->lex->in_sum_func &&
thd->lex->in_sum_func->nest_level >= select->nest_level)
{
Item::Type ref_type= (*reference)->type();
set_if_bigger(thd->lex->in_sum_func->max_arg_level,
select->nest_level);
}
/*
A reference to a view field had been found and we
substituted it instead of this Item (find_field_in_tables