Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/12494#issuecomment-212747103
@viirya Ah, thanks! however, I am a bit worried if disallowing `null` as a
value in options is correct. I don't want to be kind of so picky but I think it
might not be guaranteed that every option does not take `null` as a value for
all.
Maybe in some external datasources or future options, I think there might
be some cases that setting `null` as an option and not setting are not the same.
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