class_docstr: This plan is used for storing information required for probabilistic
  predicate.
  
  Arguments:
      predicate (AbstractExpression): A predicate expression used for
      filtering frames
code: def __init__(self, predicate: AbstractExpression):
      super().__init__(PlanOprType.PP_FILTER, predicate)
  
imports: from evadb.expression.abstract_expression import AbstractExpression
  from evadb.plan_nodes.abstract_scan_plan import AbstractScan
  from evadb.plan_nodes.types import PlanOprType
label_desc: Use image node_id 1 to create a new PPScanPlan object from inherited base classes: AbstractScan with example: obj = PPScanPlan(predicate)