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Fixed bug #27257: queries containing subqueries with COUNT(*)

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aggregated in outer context returned wrong results.
This happened only if the subquery did not contain any references
to outer fields.
As there were no references to outer fields the subquery erroneously
was taken for non-correlated one.
Now any set function aggregated in outer context makes the subquery
correlated.
This commit is contained in:
igor@olga.mysql.com 2007-03-20 11:51:09 -07:00
parent 31b9145ab3
commit 19da4d3972
3 changed files with 47 additions and 0 deletions
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25
mysql-test/r/subselect.result
View File

@ -3880,3 +3880,28 @@ this is a test. 3
this is a test. 1
this is a test. 2
DROP table t1;
CREATE TABLE t1 (a int, b int);
CREATE TABLE t2 (m int, n int);
INSERT INTO t1 VALUES (2,2), (2,2), (3,3), (3,3), (3,3), (4,4);
INSERT INTO t2 VALUES (1,11), (2,22), (3,32), (4,44), (4,44);
SELECT COUNT(*), a,
(SELECT m FROM t2 WHERE m = count(*) LIMIT 1)
FROM t1 GROUP BY a;
COUNT(*) a (SELECT m FROM t2 WHERE m = count(*) LIMIT 1)
2 2 2
3 3 3
1 4 1
SELECT COUNT(*), a,
(SELECT MIN(m) FROM t2 WHERE m = count(*))
FROM t1 GROUP BY a;
COUNT(*) a (SELECT MIN(m) FROM t2 WHERE m = count(*))
2 2 2
3 3 3
1 4 1
SELECT COUNT(*), a
FROM t1 GROUP BY a
HAVING (SELECT MIN(m) FROM t2 WHERE m = count(*)) > 1;
COUNT(*) a
2 2
3 3
DROP TABLE t1,t2;

21
mysql-test/t/subselect.test
View File

@ -2741,4 +2741,25 @@ SELECT * FROM (SELECT 'this is ' 'a test.' AS col1, a AS t2 FROM t1) t;
DROP table t1;
#
# Bug #27257: COUNT(*) aggregated in outer query
#
CREATE TABLE t1 (a int, b int);
CREATE TABLE t2 (m int, n int);
INSERT INTO t1 VALUES (2,2), (2,2), (3,3), (3,3), (3,3), (4,4);
INSERT INTO t2 VALUES (1,11), (2,22), (3,32), (4,44), (4,44);
SELECT COUNT(*), a,
(SELECT m FROM t2 WHERE m = count(*) LIMIT 1)
FROM t1 GROUP BY a;
SELECT COUNT(*), a,
(SELECT MIN(m) FROM t2 WHERE m = count(*))
FROM t1 GROUP BY a;
SELECT COUNT(*), a
FROM t1 GROUP BY a
HAVING (SELECT MIN(m) FROM t2 WHERE m = count(*)) > 1;
DROP TABLE t1,t2;

1
sql/item_sum.cc
View File

@ -267,6 +267,7 @@ bool Item_sum::register_sum_func(THD *thd, Item **ref)
sl= sl->master_unit()->outer_select() )
sl->master_unit()->item->with_sum_func= 1;
}
thd->lex->current_select->mark_as_dependent(aggr_sl);
return FALSE;
}