Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/17865#discussion_r114930366
--- Diff: python/pyspark/sql/functions.py ---
@@ -793,8 +824,8 @@ 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()
+ >>> df = spark.createDataFrame([('2015-04-08',)], ['time'])
--- End diff --
Okay. I guess it is a documentation improvement to use a bit more
meaningful name over an arbitrary name `a`. Let's match these to existing names
such as `ts` or `t` (abbreviation for timestamp) or `dt` (abbreviation for
`datetime.datetime`).
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