code: def _execute_subset_tree_combine(cls, ctx, op):
      inp = ctx[op.input.key]
      ctx[op.outputs[0].key] = cls._drop_duplicates(
          inp, op, ignore_index=False
      )
  
imports: import inspect
  import numpy
  import pandas
  from pandas.api.types import is_list_like
  from ...config import options
  from ...core import OutputType, recursive_tile
  from ...core.operand import OperandStage, MapReduceOperand
  from ...serialization.serializables import AnyField, Int32Field, StringField, KeyField
  from ...utils import ceildiv, has_unknown_shape, lazy_import
  from ..initializer import DataFrame
  from ..operands import DataFrameOperandMixin, DataFrameShuffleProxy
label_desc: Use image node_id 22 for calling the DuplicateOperand obj's underlying member method code with example usage: obj._execute_subset_tree_combine(cls, ctx, op) without return types