Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/9115#issuecomment-149335456
@JoshRosen I think you are right. It is not always safe to do this
optimization. The result will be wrong whenever the cast causes information
loss.
@viirya Sorry, I did not think about all cases before I opened the jira.
How about we close this PR for now?
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