Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/12120#issuecomment-204619514
Similarly, if `IF`'s condition evaluates to `null` then it looks like the
result of `IF` is the `falseExpression` rather than `null`, so we don't have to
worry about the pushdown breaking things. I'll also add tests for this.
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