Github user jiangxb1987 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20400#discussion_r164207466
  
    --- Diff: python/pyspark/sql/window.py ---
    @@ -124,16 +124,19 @@ def rangeBetween(start, end):
             values directly.
     
             :param start: boundary start, inclusive.
    -                      The frame is unbounded if this is 
``Window.unboundedPreceding``, or
    +                      The frame is unbounded if this is 
``Window.unboundedPreceding``,
    +                      
``org.apache.spark.sql.catalyst.expressions.UnboundedPreceding``, or
                           any value less than or equal to max(-sys.maxsize, 
-9223372036854775808).
             :param end: boundary end, inclusive.
    -                    The frame is unbounded if this is 
``Window.unboundedFollowing``, or
    +                    The frame is unbounded if this is 
``Window.unboundedFollowing``,
    +                    
``org.apache.spark.sql.catalyst.expressions.UnboundedPFollowing``, or
                         any value greater than or equal to min(sys.maxsize, 
9223372036854775807).
             """
    -        if start <= Window._PRECEDING_THRESHOLD:
    -            start = Window.unboundedPreceding
    -        if end >= Window._FOLLOWING_THRESHOLD:
    -            end = Window.unboundedFollowing
    +        if isinstance(start, int) and isinstance(end, int):
    +            if start <= Window._PRECEDING_THRESHOLD:
    +                start = Window.unboundedPreceding
    --- End diff --
    
    This is not standard behavior, we may consider change this.


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