lp:737458 Casting dates and times into integers works differently in 5.1-micro

better default for Field::cast_to_int_type()

mysql-test/r/cast.result

@@ -452,3 +452,9 @@ SELECT CONVERT(t2.a USING UTF8) FROM t1, t1 t2 LIMIT 1
 1
 DROP TABLE t1;
 End of 5.1 tests
+create table t1 (f1 time, f2 date, f3 datetime);
+insert into t1 values ('11:22:33','2011-12-13','2011-12-13 11:22:33');
+select cast(f1 as unsigned), cast(f2 as unsigned), cast(f3 as unsigned) from t1;
+cast(f1 as unsigned)	cast(f2 as unsigned)	cast(f3 as unsigned)
+112233	20111213	20111213112233
+drop table t1;

mysql-test/t/cast.test

@@ -284,3 +284,12 @@ DROP TABLE t1;
 
 
 --echo End of 5.1 tests
+
+#
+# lp:737458 Casting dates and times into integers works differently in 5.1-micro
+#
+create table t1 (f1 time, f2 date, f3 datetime);
+insert into t1 values ('11:22:33','2011-12-13','2011-12-13 11:22:33');
+select cast(f1 as unsigned), cast(f2 as unsigned), cast(f3 as unsigned) from t1;
+drop table t1;
+

sql/field.h

@@ -149,7 +149,7 @@ class Field
   virtual bool str_needs_quotes() { return FALSE; }
   virtual Item_result result_type () const=0;
   virtual Item_result cmp_type () const { return result_type(); }
-  virtual Item_result cast_to_int_type () const { return result_type(); }
+  virtual Item_result cast_to_int_type () const { return cmp_type(); }
   static bool type_can_have_key_part(enum_field_types);
   static enum_field_types field_type_merge(enum_field_types, enum_field_types);
   static Item_result result_merge_type(enum_field_types);