Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/12629#issuecomment-215911793
Ping @davies and @viirya.
It sets a default value for `null` to the options that throw an
`NullPointExceptiom` and just passes `null` for some options that take `null`.
If you think `null` should not be passed at all, then I can fix them.
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