Fixed bug #1323 (varchar fields becoming char fields adter create ... select)

mysql-test/r/create.result

@@ -78,7 +78,7 @@ Field	Type	Null	Key	Default	Extra
 x	varchar(50)	YES		NULL	
 describe t2;
 Field	Type	Null	Key	Default	Extra
-x	char(50)	YES		NULL	
+x	varchar(50)	YES		NULL	
 drop table t2;
 create table t2 select now() as a , curtime() as b, curdate() as c , 1+1 as d , 1.0 + 1 as e , 33333333333333333 + 3 as f;
 describe t2;

sql/sql_select.cc

@@ -3706,6 +3706,8 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
 	new_field->field_name=item->name;
       if (org_field->maybe_null())
 	new_field->flags&= ~NOT_NULL_FLAG;	// Because of outer join
+      if (org_field->type()==FIELD_TYPE_VAR_STRING)
+	table->db_create_options|= HA_OPTION_PACK_RECORD;
     }
     return new_field;
   }