class_docstr: This plan is used for pushing down query string directly to
  backend database engine.
code: def __init__(
      self,
      plan_type: PlanOprType,
      database_name: str,
      query_string: str,
  ):
      self._database_name = database_name
      self._query_string = query_string
      super().__init__(plan_type)
  
file_path: evadb/evadb/plan_nodes/native_plan.py
imports: from evadb.plan_nodes.abstract_plan import AbstractPlan
  from evadb.plan_nodes.types import PlanOprType
label_desc: Use image node_id 1 to create a new NativePlan object from inherited base classes: AbstractPlan with example: obj = NativePlan(plan_type, database_name, query_string)