code: def output_limit(self):
      return 2 if self.output_agg else 1
  
imports: from collections import namedtuple, OrderedDict
  from collections.abc import Iterable
  from typing import Dict
  import numpy
  import pandas
  from ...core.operand import OperandStage
  from ...serialization.serializables import AnyField, BoolField, Int32Field, Int64Field, DictField, StringField
  from ...utils import tokenize
  from ..core import DATAFRAME_TYPE
  from ..merge import DataFrameConcat
  from ..operands import DataFrameOperand, DataFrameOperandMixin
  from ..utils import build_df, parse_index, build_empty_series, filter_dtypes_by_index
label_desc: Use image node_id 15 for calling the BaseDataFrameExpandingAgg obj's underlying member method code with example usage: obj.output_limit() and returns: unknown