Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/12120#issuecomment-204619390
There's one corner-case related to null-handling that I'd like to clarify
(and probably add tests for):
- I think that `CASE WHEN` can return `null` if it's defined without an
`ELSE` case. I think it's also the cast that casting preserves nullness, so
this should be fine but deserves a code comment and test just to be sure.
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