Fix for bug #23616: Week() changed behaviour between 5.0.22 and 5.0.24

Consider double values as legal date{time} function's arguments
(i.e. allow dates in internal format YYYYMMDDHHMMSS.XXXXXX).

mysql-test/r/func_sapdb.result

@@ -229,9 +229,7 @@ a
 10000
 select microsecond(19971231235959.01) as a;
 a
-0
-Warnings:
-Warning	1292	Truncated incorrect time value: '19971231235959.01'
+10000
 select date_add("1997-12-31",INTERVAL "10.09" SECOND_MICROSECOND) as a;
 a
 1997-12-31 00:00:10.090000

mysql-test/r/func_time.result

@@ -854,4 +854,8 @@ H
 select last_day('0000-00-00');
 last_day('0000-00-00')
 NULL
+select isnull(week(now() + 0)), isnull(week(now() + 0.2)),
+week(20061108), week(20061108.01), week(20061108085411.000002);
+isnull(week(now() + 0))	isnull(week(now() + 0.2))	week(20061108)	week(20061108.01)	week(20061108085411.000002)
+0	0	45	45	45
 End of 4.1 tests

mysql-test/t/func_time.test

@@ -492,4 +492,11 @@ union
 
 select last_day('0000-00-00');
 
+#
+# Bug 23616: datetime functions with double argumets
+#
+
+select isnull(week(now() + 0)), isnull(week(now() + 0.2)),
+  week(20061108), week(20061108.01), week(20061108085411.000002);
+
 --echo End of 4.1 tests

sql-common/my_time.c

@@ -145,7 +145,7 @@ str_to_datetime(const char *str, uint length, MYSQL_TIME *l_time,
   digits= (uint) (pos-str);
   start_loop= 0;                                /* Start of scan loop */
   date_len[format_position[0]]= 0;              /* Length of year field */
-  if (pos == end)
+  if (pos == end || *pos == '.')
   {
     /* Found date in internal format (only numbers like YYYYMMDD) */
     year_length= (digits == 4 || digits == 8 || digits >= 14) ? 4 : 2;