Github user dbtsai commented on the issue:
https://github.com/apache/spark/pull/21850
@gatorsmile All the new rules added into `If` should always have `CaseWhen`
version.
But there will be time that we only add `If` version, or it only makes
sense to have `If` version.
For example, the new rule that short-circuiting the `If` when both branches
are the same is not yet in `CaseWhen`. Another rule I am working on is when a
conditional expression in `Filter` or `Join`, if any of the output of the
branches contains `Literal(null, _)`, it can be replaced by `FalseLiteral`. I
only implemented for `If` so far for our use-case.
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