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

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

Fix: as we compare DATETIMEs as strings we must trim trailing 0's
in such cases.
This commit is contained in:
Ramil Kalimullin
2009-10-13 09:43:27 +05:00
parent 814a3cc246
commit 5a23617a80
3 changed files with 98 additions and 7 deletions
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42
mysql-test/r/innodb_mysql.result
View File

@ -2209,4 +2209,46 @@ EXPLAIN SELECT * FROM t1 FORCE INDEX(PRIMARY) WHERE b=1 AND c=1 ORDER BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 4 NULL 128 Using where
DROP TABLE t1;
#
# Bug #47963: Wrong results when index is used
#
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';
a b c
TEST TEST 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';
a b c
TEST TEST 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';
a b c
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 00:00:00.0';
a b c
TEST TEST 2009-10-09 00:00:00
SELECT * FROM t1 WHERE a = 'TEST' AND
c >= '2009-10-09 00:00:00.000' AND c <= '2009-10-09 00:00:00.000';
a b c
TEST TEST 2009-10-09 00:00:00
SELECT * FROM t1 WHERE a = 'TEST' AND
c >= '2009-10-09 00:00:00.00' AND c <= '2009-10-09 00:00:00.001';
a b c
TEST TEST 2009-10-09 00:00:00
SELECT * FROM t1 WHERE a = 'TEST' AND
c >= '2009-10-09 00:00:00.001' AND c <= '2009-10-09 00:00:00.00';
a b c
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';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
DROP TABLE t1;
End of 5.1 tests