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Bug#49489: Uninitialized cache led to a wrong result.

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Arg_comparator uses Item_cache objects to store constants being compared when
they're need a type conversion. Because this cache wasn't initialized properly
Arg_comparator might produce wrong comparison result.

The Arg_comparator::cache_converted_constant function now initializes cache
prior to usage.

mysql-test/r/select.result:
  Added a test case for he bug#49489.
mysql-test/t/select.test:
  Added a test case for he bug#49489.
sql/item_cmpfunc.cc:
  Bug#49489: Uninitialized cache led to a wrong result.
  The Arg_comparator::cache_converted_constant function now initializes cache
  prior to usage.
This commit is contained in:
Evgeny Potemkin
2009-12-09 18:43:45 +03:00
parent 3a733bb4d8
commit 1285ecd468
3 changed files with 20 additions and 1 deletions
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10
mysql-test/r/select.result
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@ -4609,4 +4609,14 @@ HAVING v <= 't'
ORDER BY pk;
v
DROP TABLE t1;
#
# Bug#49489 Uninitialized cache led to a wrong result.
#
CREATE TABLE t1(c1 DOUBLE(5,4));
INSERT INTO t1 VALUES (9.1234);
SELECT * FROM t1 WHERE c1 < 9.12345;
c1
9.1234
DROP TABLE t1;
# End of test for bug#49489.
End of 5.1 tests