[GitHub] spark issue #13771: [SPARK-13748][PYSPARK][DOC] Add the description for expl...

[HyukjinKwon <gi...@git.apache.org>]

Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/13771
  
    Hi @davies, this PR adds a documentation that describes the potentially confusing behaviour as is for the current state. I know this is a super trivial but it is an improvement without any regression. Assuming the JIRA https://issues.apache.org/jira/browse/SPARK-12624, it seems we don't want to allow omitting and it looks it describes the correct behaviour.
    
    Could I please ask to take a look please?


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