Update test results

mysql-test/r/func_group.result:
  Update results

mysql-test/r/func_group.result

@@ -742,10 +742,10 @@ insert into t1 values (now());
 create table t2 select f2 from (select max(now()) f2 from t1) a;
 show columns from t2;
 Field	Type	Null	Key	Default	Extra
-f2	datetime			0000-00-00 00:00:00	
+f2	datetime	NO		0000-00-00 00:00:00	
 drop table t2;
 create table t2 select f2 from (select now() f2 from t1) a;
 show columns from t2;
 Field	Type	Null	Key	Default	Extra
-f2	datetime			0000-00-00 00:00:00	
+f2	datetime	NO		0000-00-00 00:00:00	
 drop table t2, t1;