Bug #32180: DATE_ADD treats datetime numeric argument as DATE instead of DATETIME

This is a regression from 2007-05-18 when code to zero out the returned struct was
added to number_to_datetime(); zero for time_type corresponds to MYSQL_TIMESTAMP_DATE.
We now explicitly set the type we return (MYSQL_TIMESTAMP_DATETIME).

mysql-test/r/func_time.result

@@ -1270,4 +1270,16 @@ select concat(a,ifnull(min(date_format(now(), '%Y-%m-%d')),' ull')) from t1;
 ERROR HY000: Illegal mix of collations (ascii_general_ci,IMPLICIT) and (latin1_swedish_ci,COERCIBLE) for operation 'concat'
 set lc_time_names=en_US;
 drop table t1;
+select DATE_ADD('20071108181000', INTERVAL 1 DAY);
+DATE_ADD('20071108181000', INTERVAL 1 DAY)
+2007-11-09 18:10:00
+select DATE_ADD(20071108181000,   INTERVAL 1 DAY);
+DATE_ADD(20071108181000,   INTERVAL 1 DAY)
+2007-11-09 18:10:00
+select DATE_ADD('20071108',       INTERVAL 1 DAY);
+DATE_ADD('20071108',       INTERVAL 1 DAY)
+2007-11-09
+select DATE_ADD(20071108,         INTERVAL 1 DAY);
+DATE_ADD(20071108,         INTERVAL 1 DAY)
+2007-11-09
 End of 5.0 tests

mysql-test/t/func_time.test

@@ -787,4 +787,14 @@ select concat(a,ifnull(min(date_format(now(), '%Y-%m-%d')),' ull')) from t1;
 set lc_time_names=en_US;
 drop table t1;
 
+#
+# Bug#32180: DATE_ADD treats datetime numeric argument as DATE
+#            instead of DATETIME
+#
+
+select DATE_ADD('20071108181000', INTERVAL 1 DAY);
+select DATE_ADD(20071108181000,   INTERVAL 1 DAY);
+select DATE_ADD('20071108',       INTERVAL 1 DAY);
+select DATE_ADD(20071108,         INTERVAL 1 DAY);
+
 --echo End of 5.0 tests

sql-common/my_time.c

@@ -1113,9 +1113,14 @@ longlong number_to_datetime(longlong nr, MYSQL_TIME *time_res,
   long part1,part2;
 
   *was_cut= 0;
+  bzero((char*) time_res, sizeof(*time_res));
+  time_res->time_type=MYSQL_TIMESTAMP_DATE;
 
   if (nr == LL(0) || nr >= LL(10000101000000))
+  {
+    time_res->time_type=MYSQL_TIMESTAMP_DATETIME;
     goto ok;
+  }
   if (nr < 101)
     goto err;
   if (nr <= (YY_PART_YEAR-1)*10000L+1231L)
@@ -1139,6 +1144,9 @@ longlong number_to_datetime(longlong nr, MYSQL_TIME *time_res,
   }
   if (nr < 101000000L)
     goto err;
+
+  time_res->time_type=MYSQL_TIMESTAMP_DATETIME;
+
   if (nr <= (YY_PART_YEAR-1)*LL(10000000000)+LL(1231235959))
   {
     nr= nr+LL(20000000000000);                   /* YYMMDDHHMMSS, 2000-2069 */
@@ -1152,7 +1160,6 @@ longlong number_to_datetime(longlong nr, MYSQL_TIME *time_res,
  ok:
   part1=(long) (nr/LL(1000000));
   part2=(long) (nr - (longlong) part1*LL(1000000));
-  bzero((char*) time_res, sizeof(*time_res));
   time_res->year=  (int) (part1/10000L);  part1%=10000L;
   time_res->month= (int) part1 / 100;
   time_res->day=   (int) part1 % 100;