code: def _select_query(self):
          
          if self._where:
              self._validate_select_where()
          return SelectStatement(
              self.column_family_name,
              fields=self._select_fields(),
              where=self._where,
              order_by=self._order,
              limit=self._limit,
              allow_filtering=self._allow_filtering
          )
docs: Returns a select clause based on the given filter args