An addition (see ChangeSet

1.2082 04/10/11 18:38:48 ram@gw.mysql.r18.ru +3 -0                            
A fix (bug #5615 type of aggregate function column wrong when using group by).)

Shouldn't it be 'int(11) not null' == the same as in the t1?

mysql-test/r/show_check.result

@@ -250,9 +250,11 @@ type_bool	type_tiny	type_short	type_mediumint	type_bigint	type_decimal	type_nume
 drop table t1;
 create table t1 (a int not null);
 create table t2 select max(a) from t1;
+Warnings:
+Warning	1263	Data truncated; NULL supplied to NOT NULL column 'max(a)' at row 1
 show columns from t2;
 Field	Type	Null	Key	Default	Extra
-max(a)	bigint(20)	YES		NULL	
+max(a)	int(11)			0	
 drop table t1,t2;
 create table t1 (c decimal, d double, f float, r real);
 show columns from t1;