Fix bug #14466 lost sort order in GROUP_CONCAT() in a view

Item_func_group_concat::print() wasn't printing sort order thus creating wrong
view. This results in reported error.

mysql-test/r/view.result

@@ -2323,3 +2323,15 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	Using where
 DROP VIEW v1,v2;
 DROP TABLE t1,t2,t3;
+create table t1 (f1 int, f2 int);
+insert into t1 values(1,1),(1,2),(1,3);
+create view v1 as select f1 ,group_concat(f2 order by f2 asc) from t1 group by f1;
+create view v2 as select f1 ,group_concat(f2 order by f2 desc) from t1 group by f1;
+select * from v1;
+f1	group_concat(f2 order by f2 asc)
+1	1,2,3
+select * from v2;
+f1	group_concat(f2 order by f2 desc)
+1	3,2,1
+drop view v1,v2;
+drop table t1;

mysql-test/t/view.test

@@ -2189,4 +2189,14 @@ EXPLAIN SELECT * FROM v2 WHERE a=1;
 DROP VIEW v1,v2;
 DROP TABLE t1,t2,t3;
 
-
+#
+# Bug #14466 lost sort order in GROUP_CONCAT() in a view
+#
+create table t1 (f1 int, f2 int);
+insert into t1 values(1,1),(1,2),(1,3);
+create view v1 as select f1 ,group_concat(f2 order by f2 asc) from t1 group by f1;
+create view v2 as select f1 ,group_concat(f2 order by f2 desc) from t1 group by f1;
+select * from v1;
+select * from v2;
+drop view v1,v2;
+drop table t1;

sql/item_sum.cc

@@ -3173,6 +3173,10 @@ void Item_func_group_concat::print(String *str)
       if (i)
         str->append(',');
       (*order[i]->item)->print(str);
+      if (order[i]->asc)
+        str->append(" ASC");
+      else
+        str->append(" DESC");
     }
   }
   str->append(" separator \'", 12);