1 files changed, 3 insertions, 23 deletions

diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 139c2c67dad..6eb4ecbb4cf 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -933,8 +933,9 @@ JOIN::prepare(TABLE_LIST *tables_init,
             item->max_length)))
         real_order= TRUE;
 
-      if (item->with_sum_func && item->type() != Item::SUM_FUNC_ITEM)
-        item->split_sum_func(thd, ref_ptrs, all_fields, 0);
+      if ((item->with_sum_func && item->type() != Item::SUM_FUNC_ITEM) ||
+          item->with_window_func)
+        item->split_sum_func(thd, ref_ptrs, all_fields, SPLIT_SUM_SELECT);
     }
     if (!real_order)
       order= NULL;
@@ -26714,27 +26715,6 @@ AGGR_OP::end_send()
     }
     else
     {
-      /*
-         In case we have window functions present, an extra step is required
-         to compute all the fields from the temporary table.
-         In case we have a compound expression such as: expr + expr,
-         where one of the terms has a window function inside it, only
-         after computing window function values we actually know the true
-         final result of the compounded expression.
-
-         Go through all the func items and save their values once again in the
-         corresponding temp table fields. Do this for each row in the table.
-      */
-      if (join_tab->window_funcs_step)
-      {
-        Item **func_ptr= join_tab->tmp_table_param->items_to_copy;
-        Item *func;
-        for (; (func = *func_ptr) ; func_ptr++)
-        {
-          if (func->with_window_func)
-            func->save_in_result_field(true);
-        }
-      }
       rc= evaluate_join_record(join, join_tab, 0);
     }
   }