Review of new pushed code

- Fixed some error condtion when handling dates with 'T'
- Added extra test for bug #11867 (Wrong result with "... WHERE ROW( a, b ) IN ( SELECT DISTINCT a, b WHERE ...)" to show it's not yet fixed
- Safety fixes and cleanups


mysql-test/r/subselect.result:
  Added extra test case to test case for bug #11867
  (Result shows that current code is not yet right and needs to be fixed)
mysql-test/r/type_datetime.result:
  More tests for dates of type CCYYMMDDTHHMMSS
mysql-test/t/subselect.test:
  Added extra test case to test case for bug #11867
mysql-test/t/type_datetime.test:
  More tests for dates of type CCYYMMDDTHHMMSS
sql-common/my_time.c:
  Fixed handling of dates of type CCYYMMDDTHHMMSS
  (Old code couldn't handle 2003-0304 or 2003-0003-02)
sql/slave.cc:
  Indentation cleanup
sql/sql_parse.cc:
  Added test of return value of get_system_var()
sql/sql_select.cc:
  Removed unnecessary call to field->table->maybe_null
sql/sql_union.cc:
  Indentation fixes

sql/sql_union.cc

@@ -285,6 +285,8 @@ int st_select_lex_unit::prepare(THD *thd_arg, select_result *sel_result,
     List_iterator_fast<Item> tp(types);
     Item_arena *arena= thd->current_arena;
     Item *type;
+    ulong create_options;
+
     while ((type= tp++))
     {
       if (type->result_type() == STRING_RESULT &&
@@ -295,8 +297,8 @@ int st_select_lex_unit::prepare(THD *thd_arg, select_result *sel_result,
       }
     }
     
-    ulong create_options= first_select_in_union()->options | thd_arg->options |
-                          TMP_TABLE_ALL_COLUMNS;
+    create_options= (first_select_in_union()->options | thd_arg->options |
+                     TMP_TABLE_ALL_COLUMNS);
     /*
       Force the temporary table to be a MyISAM table if we're going to use
       fullext functions (MATCH ... AGAINST .. IN BOOLEAN MODE) when reading