code: def merge(self, to_be_merged: Iterable[W], merge_result: W) -> None:
      self._merge_results[merge_result] = to_be_merged
  
file_path: flink/flink-python/pyflink/fn_execution/datastream/window/merging_window_set.py
imports: from abc import ABC, abstractmethod
  from typing import TypeVar, Generic, Collection, Iterable
  from pyflink.datastream import MergingWindowAssigner
  from pyflink.datastream.state import MapState
label_desc: Use image node_id 2 for calling the MergeResultsCallback obj's underlying member method code with example usage: obj.merge(to_be_merged, merge_result) without return types