item_sum.cc, sql_select.cc:

  After merge fix for bug#15560
item_sum.h:
   After merge fix for bug#15560

sql/item_sum.cc

@@ -3024,14 +3024,14 @@ Item_func_group_concat(Name_resolution_context *context_arg,
                        bool distinct_arg, List<Item> *select_list,
                        SQL_LIST *order_list, String *separator_arg)
   :tmp_table_param(0), warning(0),
-   force_copy_fields(0), separator(separator_arg), tree(0), table(0),
+   separator(separator_arg), tree(0), table(0),
    order(0), context(context_arg),
    arg_count_order(order_list ? order_list->elements : 0),
    arg_count_field(select_list->elements),
    count_cut_values(0),
    distinct(distinct_arg),
    warning_for_row(FALSE),
-   original(0)
+   force_copy_fields(0), original(0)
 {
   Item *item_select;
   Item **arg_ptr;
@@ -3077,7 +3077,6 @@ Item_func_group_concat::Item_func_group_concat(THD *thd,
   :Item_sum(thd, item),
   tmp_table_param(item->tmp_table_param),
   warning(item->warning),
-  force_copy_fields(item->force_copy_fields),
   separator(item->separator),
   tree(item->tree),
   table(item->table),
@@ -3089,6 +3088,7 @@ Item_func_group_concat::Item_func_group_concat(THD *thd,
   distinct(item->distinct),
   warning_for_row(item->warning_for_row),
   always_null(item->always_null),
+  force_copy_fields(item->force_copy_fields),
   original(item)
 {
   quick_group= item->quick_group;

sql/item_sum.h

@@ -525,13 +525,13 @@ class Item_sum_count_distinct :public Item_sum_int
 public:
   Item_sum_count_distinct(List<Item> &list)
     :Item_sum_int(list), table(0), field_lengths(0), tmp_table_param(0),
-     tree(0), force_copy_fields(0), original(0), always_null(FALSE)
+     force_copy_fields(0), tree(0), original(0), always_null(FALSE)
   { quick_group= 0; }
   Item_sum_count_distinct(THD *thd, Item_sum_count_distinct *item)
     :Item_sum_int(thd, item), table(item->table),
      field_lengths(item->field_lengths),
      tmp_table_param(item->tmp_table_param),
-     tree(item->tree), force_copy_fields(0), original(item),
+     force_copy_fields(0), tree(item->tree), original(item),
      tree_key_length(item->tree_key_length),
      always_null(item->always_null)
   {}

sql/sql_select.cc

@@ -8669,8 +8669,9 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
         create_tmp_field_for_schema(thd, item, table) :
         create_tmp_field(thd, table, item, type, &copy_func,
                          tmp_from_field, group != 0,
-                         not_all_columns || group != 0,
-                         item->marker == 4, 0,
+                         !force_copy_fields &&
+                           (not_all_columns || group !=0),
+                         item->marker == 4, force_copy_fields,
                          param->convert_blob_length);
 
       if (!new_field)