Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/6551#issuecomment-107513431
It's better to update the rule for `CaseWhenCoercion` and `Coalesce`
directly, not provide a general rule, which probably break the existed logic as
@cloud-fan said.
Beside, can you also add a unit test to compare the hive answer?
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