Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/8983#issuecomment-145953466
ok misleaded by the imperative code style, sorry for that...
So we will return null if the `key` is null, or we can't find a value in
`list` matching our `key`, and there is null value inside `list`.
This PR make `In` operation return null when `key` is NullType, which is
right. But I think we can do it further by returning null for any type of `key`
which is literal null(probably another PR).
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