class_docstr: Base node type for nodes in a GroupByItemResolutionDag.
  
  See GroupByItemResolutionDag for more details.
code: def parent_nodes(
      self,
  ) -> Sequence[GroupByItemResolutionNode]:  # noqa: D
      raise NotImplementedError
  
imports: from __future__ import annotations
  from abc import ABC, abstractmethod
  from typing import TYPE_CHECKING, Generic, Sequence
  from typing_extensions import override
  from metricflow.dag.id_prefix import IdPrefix
  from metricflow.dag.mf_dag import DagNode, NodeId
  from metricflow.visitor import Visitable, VisitorOutputT
label_desc: Use image node_id 4 for calling the GroupByItemResolutionNode obj's underlying member method code with example usage: obj.parent_nodes() without return types