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| author | Evgeny Potemkin <epotemkin@mysql.com> | 2008-11-05 18:40:23 +0300 |
|---|---|---|
| committer | Evgeny Potemkin <epotemkin@mysql.com> | 2008-11-05 18:40:23 +0300 |
| commit | 3c49cb0795fae5c43d00a499b1d4f71365bb9ba9 (patch) | |
| tree | a52cac0068f7fecdc739e890dc0bc688ece7ae3c /mysql-test/r/explain.result | |
| parent | c8ee385d89338cca73dd069c7c03074d171cc8f4 (diff) | |
| download | mariadb-git-3c49cb0795fae5c43d00a499b1d4f71365bb9ba9.tar.gz | |
Bug#37870: Usage of uninitialized value caused failed assertion.
The convert_constant_item function converts a constant to integer using
field for condition like 'field = a_constant'. In some cases the
convert_constant_item is called for a subquery when outer select is already
being executed, so convert_constant_item saves field's value to prevent its
corruption. For EXPLAIN and at the prepare phase field's value isn't
initialized yet, thus when convert_constant_item tries to restore saved
value it fails assertion.
Now the convert_constant_item doesn't save/restore field's value if it's
haven't been read yet. Outer constant values are always saved.
mysql-test/r/explain.result:
Added a test case for the bug#37870.
mysql-test/t/explain.test:
Added a test case for the bug#37870.
sql/item_cmpfunc.cc:
Bug#37870: Usage of uninitialized value caused failed assertion.
Now the convert_constant_item doesn't save/restore field's value if it's
haven't been read yet. Outer constant values are always saved.
Diffstat (limited to 'mysql-test/r/explain.result')
| -rw-r--r-- | mysql-test/r/explain.result | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/mysql-test/r/explain.result b/mysql-test/r/explain.result index ee3a4ba3387..3de741b5efb 100644 --- a/mysql-test/r/explain.result +++ b/mysql-test/r/explain.result @@ -158,15 +158,27 @@ DROP TABLE t1,t2; # # Bug#37870: Usage of uninitialized value caused failed assertion. # -create table t1 (dt datetime not null); +create table t1 (dt datetime not null, t time not null); create table t2 (dt datetime not null); -insert into t1 values ('2001-01-01 1:1:1'), ('2001-01-01 1:1:1'); +insert into t1 values ('2001-01-01 1:1:1', '1:1:1'), +('2001-01-01 1:1:1', '1:1:1'); insert into t2 values ('2001-01-01 1:1:1'), ('2001-01-01 1:1:1'); flush tables; EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL ); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY OUTR ALL NULL NULL NULL NULL 2 Using where 2 DEPENDENT SUBQUERY INNR ALL NULL NULL NULL NULL 2 Using where +flush tables; SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL ); dt +flush tables; +EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' ); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY OUTR ALL NULL NULL NULL NULL 2 Using where +2 DEPENDENT SUBQUERY INNR ALL NULL NULL NULL NULL 2 Using where +flush tables; +SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' ); +dt +2001-01-01 01:01:01 +2001-01-01 01:01:01 drop tables t1, t2; |