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

    https://github.com/apache/spark/pull/17865#discussion_r123184653
  
    --- Diff: python/pyspark/sql/functions.py ---
    @@ -793,9 +824,9 @@ def date_format(date, format):
         .. note:: Use when ever possible specialized functions like `year`. 
These benefit from a
             specialized implementation.
     
    -    >>> df = spark.createDataFrame([('2015-04-08',)], ['a'])
    -    >>> df.select(date_format('a', 'MM/dd/yyy').alias('date')).collect()
    -    [Row(date=u'04/08/2015')]
    +    >>> df = spark.createDataFrame([('2015-04-08',)], ['dt'])
    +    >>> df.select(date_format('dt', 'MM/dd/yyy').alias('dt2')).collect()
    --- End diff --
    
    `date` to `dt2` sounds unnecessary change.


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