Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22395
To clarify, it's not following hive, but following the behavior of previous
Spark versions, which is same as hive.
I also think returning left operand's type is more reasonable, but we
should do it in another PR since it's a behavior change, and we should also add
migration guide for it.
@mgaido91 do you have time to do this change? Thanks!
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