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BUG#33794 "MySQL crashes executing specific query":

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The problem occurred when one had a subquery that had an equality X=Y where 
Y referred to a named select list expression from the parent select. MySQL 
crashed when trying to use the X=Y equality for ref-based access. 

Fixed by allowing non-Item_field items in the described case.


mysql-test/r/subselect.result:
  BUG#33794 "MySQL crashes executing specific query"
  - Testcase
mysql-test/t/subselect.test:
  BUG#33794 "MySQL crashes executing specific query"
  - Testcase
sql/sql_select.cc:
  BUG#33794 "MySQL crashes executing specific query"
  get_store_key() assumed that if it got a reference
    t.key=Item_outer_ref(Item_direct_ref(x)) 
  then x was an Item_field object, which is not the case when one refers to a
  named select list expression out ot subquery.
This commit is contained in:
unknown
2008-01-18 22:50:36 +03:00
parent ec25326975
commit c71a6428d8
3 changed files with 105 additions and 1 deletions
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55
mysql-test/t/subselect.test
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@ -3252,4 +3252,59 @@ select count(*) from t1 where f12 =
(select f22 from t2 where f22 = f12 order by f21 desc, f22, f23 limit 1);
drop table t1,t2;
#
# BUG#33794 "MySQL crashes executing specific query on specific dump"
#
CREATE TABLE t4 (
f7 varchar(32) collate utf8_bin NOT NULL default '',
f10 varchar(32) collate utf8_bin default NULL,
PRIMARY KEY (f7)
);
INSERT INTO t4 VALUES(1,1), (2,null);
CREATE TABLE t2 (
f4 varchar(32) collate utf8_bin NOT NULL default '',
f2 varchar(50) collate utf8_bin default NULL,
f3 varchar(10) collate utf8_bin default NULL,
PRIMARY KEY (f4),
UNIQUE KEY uk1 (f2)
);
INSERT INTO t2 VALUES(1,1,null), (2,2,null);
CREATE TABLE t1 (
f8 varchar(32) collate utf8_bin NOT NULL default '',
f1 varchar(10) collate utf8_bin default NULL,
f9 varchar(32) collate utf8_bin default NULL,
PRIMARY KEY (f8)
);
INSERT INTO t1 VALUES (1,'P',1), (2,'P',1), (3,'R',2);
CREATE TABLE t3 (
f6 varchar(32) collate utf8_bin NOT NULL default '',
f5 varchar(50) collate utf8_bin default NULL,
PRIMARY KEY (f6)
);
INSERT INTO t3 VALUES (1,null), (2,null);
SELECT
IF(t1.f1 = 'R', a1.f2, t2.f2) AS a4,
IF(t1.f1 = 'R', a1.f3, t2.f3) AS f3,
SUM(
IF(
(SELECT VPC.f2
FROM t2 VPC, t4 a2, t2 a3
WHERE
VPC.f4 = a2.f10 AND a3.f2 = a4
LIMIT 1) IS NULL,
0,
t3.f5
)
) AS a6
FROM
t2, t3, t1 JOIN t2 a1 ON t1.f9 = a1.f4
GROUP BY a4;
DROP TABLE t1, t2;
--echo End of 5.0 tests.