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

    https://github.com/apache/spark/pull/20400#discussion_r165839717
  
    --- Diff: python/pyspark/sql/functions.py ---
    @@ -809,6 +809,36 @@ def ntile(n):
         return Column(sc._jvm.functions.ntile(int(n)))
     
     
    +@since(2.3)
    +def unboundedPreceding():
    +    """
    +    Window function: returns the special frame boundary that represents 
the first row
    +    in the window partition.
    +    """
    +    sc = SparkContext._active_spark_context
    +    return Column(sc._jvm.functions.unboundedPreceding())
    +
    +
    +@since(2.3)
    +def unboundedFollowing():
    +    """
    +    Window function: returns the special frame boundary that represents 
the last row
    +    in the window partition.
    +    """
    +    sc = SparkContext._active_spark_context
    +    return Column(sc._jvm.functions.unboundedFollowing())
    +
    +
    +@since(2.3)
    --- End diff --
    
    Shall we just go with 2.4?


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