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Fix for bug#47963: Wrong results when index is used

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Problem: using null microsecond part in a WHERE condition 
(e.g. WHERE date_time_field <= "YYYY-MM-DD HH:MM:SS.0000") 
may lead to wrong results due to improper DATETIMEs 
comparison in some cases.

Fix: comparing DATETIMEs as strings we must trim trailing 0's
in such cases.
This commit is contained in:
Ramil Kalimullin
2009-10-18 21:26:55 +05:00
parent 8e931fe53c 5a23617a80
commit df0b8e93f5
3 changed files with 98 additions and 7 deletions
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29
mysql-test/t/innodb_mysql.test
View File

@@ -461,4 +461,33 @@ EXPLAIN SELECT * FROM t1 FORCE INDEX(PRIMARY) WHERE b=1 AND c=1 ORDER BY a;
DROP TABLE t1;
--echo #
--echo # Bug #47963: Wrong results when index is used
--echo #
CREATE TABLE t1(
a VARCHAR(5) NOT NULL,
b VARCHAR(5) NOT NULL,
c DATETIME NOT NULL,
KEY (c)
) ENGINE=InnoDB;
INSERT INTO t1 VALUES('TEST', 'TEST', '2009-10-09 00:00:00');
SELECT * FROM t1 WHERE a = 'TEST' AND
c >= '2009-10-09 00:00:00' AND c <= '2009-10-09 00:00:00';
SELECT * FROM t1 WHERE a = 'TEST' AND
c >= '2009-10-09 00:00:00.0' AND c <= '2009-10-09 00:00:00.0';
SELECT * FROM t1 WHERE a = 'TEST' AND
c >= '2009-10-09 00:00:00.0' AND c <= '2009-10-09 00:00:00';
SELECT * FROM t1 WHERE a = 'TEST' AND
c >= '2009-10-09 00:00:00' AND c <= '2009-10-09 00:00:00.0';
SELECT * FROM t1 WHERE a = 'TEST' AND
c >= '2009-10-09 00:00:00.000' AND c <= '2009-10-09 00:00:00.000';
SELECT * FROM t1 WHERE a = 'TEST' AND
c >= '2009-10-09 00:00:00.00' AND c <= '2009-10-09 00:00:00.001';
SELECT * FROM t1 WHERE a = 'TEST' AND
c >= '2009-10-09 00:00:00.001' AND c <= '2009-10-09 00:00:00.00';
EXPLAIN SELECT * FROM t1 WHERE a = 'TEST' AND
c >= '2009-10-09 00:00:00.001' AND c <= '2009-10-09 00:00:00.00';
DROP TABLE t1;
--echo End of 5.1 tests