code: def __hash__(self) -> int:
      return hash(
          (self.join_type, self.left, self.right, self.predicate)
      )
  
imports: from __future__ import annotations
  from typing import Union
  from evadb.expression.abstract_expression import AbstractExpression
  from evadb.expression.function_expression import FunctionExpression
  from evadb.parser.alias import Alias
  from evadb.parser.select_statement import SelectStatement
  from evadb.parser.types import JoinType
label_desc: Use image node_id 4 for calling the JoinNode obj's underlying member method code with example usage: obj.__hash__() and returns: hash