fixed subselect with to temporary tables executing

(now it return correct results. Test was commited before, but it is not pushed,
BUG# is not registered, because bug was introduced after release)

sql/sql_select.cc

@@ -1137,6 +1137,20 @@ JOIN::exec()
       
       thd->proc_info="Copying to group table";
       tmp_error= -1;
+      if (curr_join != this)
+      {
+	if (sum_funcs2)
+	{
+	  curr_join->sum_funcs= sum_funcs2;
+	  curr_join->sum_funcs_end= sum_funcs_end2; 
+	}
+	else
+	{
+	  curr_join->alloc_func_list();
+	  sum_funcs2= curr_join->sum_funcs;
+	  sum_funcs_end2= curr_join->sum_funcs_end;
+	}
+      }
       if (curr_join->make_sum_func_list(*curr_all_fields, *curr_fields_list,
 					1) ||
 	  (tmp_error= do_select(curr_join, (List<Item> *) 0, curr_tmp_table,

sql/sql_select.h

@@ -146,6 +146,8 @@ class JOIN :public Sql_alloc
   TABLE    *exec_tmp_table1, *exec_tmp_table2;
   THD	   *thd;
   Item_sum  **sum_funcs, ***sum_funcs_end;
+  /* second copy of sumfuncs (for queries with 2 temporary tables */
+  Item_sum  **sum_funcs2, ***sum_funcs_end2;
   Procedure *procedure;
   Item	    *having;
   Item      *tmp_having; // To store Having when processed temporary table
@@ -199,7 +201,7 @@ class JOIN :public Sql_alloc
     send_records(0), found_records(0), examined_rows(0),
     exec_tmp_table1(0), exec_tmp_table2(0),
     thd(thd_arg),
-    sum_funcs(0),
+    sum_funcs(0),sum_funcs2(0),
     procedure(0),
     having(0), tmp_having(0),
     select_options(select_options_arg),