Merge 5.1->5.5.

sql/item.cc

@@ -6429,7 +6429,7 @@ bool Item_ref::fix_fields(THD *thd, Item **reference)
       if (from_field != not_found_field)
       {
         Item_field* fld;
-        if (!(fld= new Item_field(from_field)))
+        if (!(fld= new Item_field(thd, last_checked_context, from_field)))
           goto error;
         thd->change_item_tree(reference, fld);
         mark_as_dependent(thd, last_checked_context->select_lex,

sql/sql_select.cc

@@ -557,6 +557,8 @@ JOIN::prepare(Item ***rref_pointer_array,
   
   if (having)
   {
+    Query_arena backup, *arena;
+    arena= thd->activate_stmt_arena_if_needed(&backup);
     nesting_map save_allow_sum_func= thd->lex->allow_sum_func;
     thd->where="having clause";
     thd->lex->allow_sum_func|= 1 << select_lex_arg->nest_level;
@@ -565,6 +567,10 @@ JOIN::prepare(Item ***rref_pointer_array,
 			 (having->fix_fields(thd, &having) ||
 			  having->check_cols(1)));
     select_lex->having_fix_field= 0;
+    select_lex->having= having;
+    if (arena)
+      thd->restore_active_arena(arena, &backup);
+
     if (having_fix_rc || thd->is_error())
       DBUG_RETURN(-1);				/* purecov: inspected */
     thd->lex->allow_sum_func= save_allow_sum_func;