class_docstr: The internal interface for functions that process over grouped windows.
class_docstr_tok: ["The","internal","interface","for","functions","that","process","over","grouped","windows","."]
docstr: Prepares the accumulator of the given window before emit the final result. The accumulator
  is stored in the state or will be created if there is no corresponding accumulator in state.
  
  :param window: The window
docstr_tok: ["Prepares","the","accumulator","of","the","given","window","before","emit","the","final","result",".","The","accumulator","is","stored","in","the","state","or","will","be","created","if","there","is","no","corresponding","accumulator","in","state",".",":","param","window",":","The","window"]
code: def prepare_aggregate_accumulator_for_emit(self, window: W):
      """
      Prepares the accumulator of the given window before emit the final result. The accumulator
      is stored in the state or will be created if there is no corresponding accumulator in state.
  
      :param window: The window
      """
      pass
  
imports: from abc import abstractmethod, ABC
  from typing import Generic, List, Iterable, Dict, Set
  from pyflink.common import Row
  from pyflink.common.constants import MAX_LONG_VALUE
  from pyflink.datastream.state import MapState
  from pyflink.fn_execution.table.window_assigner import WindowAssigner, PanedWindowAssigner, MergingWindowAssigner
  from pyflink.fn_execution.table.window_context import Context, K, W
label_desc: Use image node_id 9 for calling the InternalWindowProcessFunction obj's underlying member method code with example usage: obj.prepare_aggregate_accumulator_for_emit(window) without return types