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

    https://github.com/apache/spark/pull/17737#discussion_r112861531
  
    --- Diff: python/pyspark/sql/column.py ---
    @@ -337,26 +381,39 @@ def isin(self, *cols):
             return Column(jc)
     
         # order
    -    asc = _unary_op("asc", "Returns a sort expression based on the"
    -                           " ascending order of the given column name.")
    -    desc = _unary_op("desc", "Returns a sort expression based on the"
    -                             " descending order of the given column name.")
    +    _asc_doc = """
    +    Returns a sort expression based on the ascending order of the given 
column name
    +
    +    >>> from pyspark.sql import Row
    +    >>> df2 = spark.createDataFrame([Row(name=u'Tom', height=80), 
Row(name=u'Alice', height=None)])
    +    >>> df2.select(df2.name).orderBy(df2.name.asc()).collect()
    +    [Row(name=u'Alice'), Row(name=u'Tom')]
    +    """
    --- End diff --
    
    ![2017-04-24 12 54 
55](https://cloud.githubusercontent.com/assets/6477701/25321941/5903bdbe-28ed-11e7-8d08-5fbab1411f02.png)



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