code: def get_queryset(self):
          
          # The CTEQuerySet uses _cte_node_* attributes from the Model, so ensure
          # they exist.
          self._ensure_parameters()
          return CTEQuerySet(self.model, using=self._db)
docs: Returns a custom :class:`QuerySet` which provides the CTE
              functionality for all queries concerning :class:`CTENode` objects.
              This method overrides the default :meth:`get_queryset` method of
              the :class:`Manager` class.
  
              :returns: a custom :class:`QuerySet` which provides the CTE
                  functionality for all queries concerning :class:`CTENode`
                  objects.