code: def __hash__(self) -> int:
      return hash(
          (
              super().__hash__(),
              self.etype,
          )
      )
  
file_path: evadb/evadb/expression/aggregation_expression.py
imports: from evadb.expression.abstract_expression import AbstractExpression, ExpressionReturnType, ExpressionType
  from evadb.models.storage.batch import Batch
label_desc: Use image node_id 7 for calling the AggregationExpression obj's underlying member method code with example usage: obj.__hash__() and returns: hash