Github user dilipbiswal commented on the pull request:
https://github.com/apache/spark/pull/10156#issuecomment-162349876
@yhuai Hi Yin, Thanks for your comments. In this fix, we are only changing
the nullability of the value for comparision purpose to see if the left and
right types are the same (ignoring the nullablity). To my understanding we are
not changing the types for processing but only changing it for comparision
purpose. The finding of the common type logic is already in place in
CaseWhenCoercion in HiveTypeCoercion when the value types are not equal ?
Please let me know what you think ..
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