Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/4057#issuecomment-70787234
Thank you for working it!
Can you explain why your change can make `Coalesce(null, 1, null)` work? To
me, it looks like an issue in constant folding instead of the return type.
Also, if we want to parse `Coalesce`, I think we really need to correctly
set the return type of it (and correctly set `nullable`). Just taking the first
expression's type seems not right. Can you take a look at this issue?
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