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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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sql/item_timefunc.h
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@@ -779,6 +779,7 @@ public:
const char *func_name() const { return "cast_as_date"; }
String *val_str(String *str);
bool get_date(MYSQL_TIME *ltime, uint fuzzy_date);
bool get_time(MYSQL_TIME *ltime);
const char *cast_type() const { return "date"; }
enum_field_types field_type() const { return MYSQL_TYPE_DATE; }
Field *tmp_table_field(TABLE *t_arg)