Github user ueshin commented on the issue:
https://github.com/apache/spark/pull/21687
Tightening `CaseWhenCoercion` rule should be okay, but I guess we need to
fix the output data type of `CaseWhen` and `If` with the same reason as
https://github.com/apache/spark/pull/21704#discussion_r199999346 anyway.
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