Merge

mysql-test/r/view.result

@@ -2190,3 +2190,9 @@ create table t1 (s1 int);
 create view abc as select * from t1 as abc;
 drop table t1;
 drop view abc;
+create table t1(f1 char(1));
+create view v1 as select * from t1;
+select * from (select f1 as f2 from v1) v where v.f2='a';
+f2
+drop view v1;
+drop table t1;

mysql-test/t/view.test

@@ -2068,3 +2068,12 @@ create table t1 (s1 int);
 create view abc as select * from t1 as abc;
 drop table t1;
 drop view abc;
+
+#
+# Bug #12993 View column rename broken in subselect
+#
+create table t1(f1 char(1));
+create view v1 as select * from t1;
+select * from (select f1 as f2 from v1) v where v.f2='a';
+drop view v1;
+drop table t1;

sql/sql_base.cc

@@ -2650,10 +2650,15 @@ find_field_in_view(THD *thd, TABLE_LIST *table_list,
        *ref != NULL means that *ref contains the item that we need to
        replace. If the item was aliased by the user, set the alias to
        the replacing item.
+       We need to set alias on both ref itself and on ref real item.
       */
       if (*ref && !(*ref)->is_autogenerated_name)
+      {
         item->set_name((*ref)->name, (*ref)->name_length,
                        system_charset_info);
+        item->real_item()->set_name((*ref)->name, (*ref)->name_length,
+                       system_charset_info);
+      }
       if (register_tree_change)
         thd->change_item_tree(ref, item);
       else