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Bug#54416 MAX from JOIN with HAVING returning NULL with 5.1 and Empty set

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The problem there is that HAVING condition evaluates const
parts of condition despite the condition has references
on aggregate functions. Table t1 became const tables
after make_join_statistics and table1.pk = 1, HAVING is
transformed into MAX(1) < 7 and taken away from HAVING.
The fix is to skip evaluation of HAVING conts parts if
HAVING condition has references on aggregate functions.
This commit is contained in:
Sergey Glukhov 2010-07-09 14:39:47 +04:00
parent b440125f1c
commit 3c39a56208
3 changed files with 38 additions and 1 deletions
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16
mysql-test/r/having.result
View File

@ -530,3 +530,19 @@ MAX(t2.f2)
NULL
DROP TABLE t1,t2;
End of 5.0 tests
#
# Bug#54416 MAX from JOIN with HAVING returning NULL with 5.1 and Empty set
#
CREATE TABLE t1 (f1 INT(11), f2 VARCHAR(1), PRIMARY KEY (f1));
INSERT INTO t1 VALUES (1,'f');
CREATE TABLE t2 (f1 INT(11), f2 VARCHAR(1));
INSERT INTO t2 VALUES (2,'m');
INSERT INTO t2 VALUES (3,'m');
INSERT INTO t2 VALUES (11,NULL);
INSERT INTO t2 VALUES (12,'k');
SELECT MAX(t1.f1) field1
FROM t1 JOIN t2 ON t2.f2 LIKE 'x'
HAVING field1 < 7;
field1
DROP TABLE t1,t2;
End of 5.1 tests

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

@ -544,3 +544,24 @@ ORDER BY t1.f2;
DROP TABLE t1,t2;
--echo End of 5.0 tests
--echo #
--echo # Bug#54416 MAX from JOIN with HAVING returning NULL with 5.1 and Empty set
--echo #
CREATE TABLE t1 (f1 INT(11), f2 VARCHAR(1), PRIMARY KEY (f1));
INSERT INTO t1 VALUES (1,'f');
CREATE TABLE t2 (f1 INT(11), f2 VARCHAR(1));
INSERT INTO t2 VALUES (2,'m');
INSERT INTO t2 VALUES (3,'m');
INSERT INTO t2 VALUES (11,NULL);
INSERT INTO t2 VALUES (12,'k');
SELECT MAX(t1.f1) field1
FROM t1 JOIN t2 ON t2.f2 LIKE 'x'
HAVING field1 < 7;
DROP TABLE t1,t2;
--echo End of 5.1 tests

2
sql/sql_select.cc
View File

@ -1132,7 +1132,7 @@ JOIN::optimize()
elements may be lost during further having
condition transformation in JOIN::exec.
*/
if (having && const_table_map)
if (having && const_table_map && !having->with_sum_func)
{
having->update_used_tables();
having= remove_eq_conds(thd, having, &having_value);