code: def __init__(self, opr_type):
      self._children = []
      self._parent = None
      self._opr_type = opr_type
  
imports: from abc import ABC, abstractmethod
  from collections import deque
  from typing import Any, List
  from evadb.plan_nodes.types import PlanOprType
label_desc: Use image node_id 1 to create a new AbstractPlan object from inherited base classes: ABC with example: obj = AbstractPlan(opr_type)