  Item_direct_view_ref(Name_resolution_context *context_arg, Item **item,
                  const char *table_name_arg,
                  const char *field_name_arg)
    :Item_direct_ref(context_arg, item, table_name_arg, field_name_arg) {}
  Item_direct_view_ref(Name_resolution_context *context_arg, Item **item,
                  const char *table_name_arg,
                  const char *field_name_arg)
    :Item_direct_ref(context_arg, item, table_name_arg, field_name_arg) {}