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Bug#31990: MINUTE() and SECOND() return bogus results when used on a DATE

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HOUR(), MINUTE(), ... returned spurious results when used on a DATE-cast.
This happened because DATE-cast object did not overload get_time() method
in superclass Item. The default method was inappropriate here and
misinterpreted the data.

Patch adds missing method; get_time() on DATE-casts now returns SQL-NULL
on NULL input, 0 otherwise. This coincides with the way DATE-columns
behave.
This commit is contained in:
tnurnberg@mysql.com/white.intern.koehntopp.de
2007-11-08 06:08:44 +01:00
parent 6b92ec4acb
commit 5a5ed2a509
4 changed files with 54 additions and 0 deletions
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24
mysql-test/r/cast.result
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@@ -414,4 +414,28 @@ NULL
NULL
20070719
drop table t1;
CREATE TABLE t1 (f1 DATE);
INSERT INTO t1 VALUES ('2007-07-19'), (NULL);
SELECT HOUR(f1),
MINUTE(f1),
SECOND(f1) FROM t1;
HOUR(f1) MINUTE(f1) SECOND(f1)
0 0 0
NULL NULL NULL
SELECT HOUR(CAST('2007-07-19' AS DATE)),
MINUTE(CAST('2007-07-19' AS DATE)),
SECOND(CAST('2007-07-19' AS DATE));
HOUR(CAST('2007-07-19' AS DATE)) MINUTE(CAST('2007-07-19' AS DATE)) SECOND(CAST('2007-07-19' AS DATE))
0 0 0
SELECT HOUR(CAST(NULL AS DATE)),
MINUTE(CAST(NULL AS DATE)),
SECOND(CAST(NULL AS DATE));
HOUR(CAST(NULL AS DATE)) MINUTE(CAST(NULL AS DATE)) SECOND(CAST(NULL AS DATE))
NULL NULL NULL
SELECT HOUR(NULL),
MINUTE(NULL),
SECOND(NULL);
HOUR(NULL) MINUTE(NULL) SECOND(NULL)
NULL NULL NULL
DROP TABLE t1;
End of 5.0 tests