Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4497#issuecomment-74858454
@guowei2 can this change be limited to merging adjacent casts that are
definitely redundant? it sounds like this change introduces bugs as-is, but
there may still be some opportunities for optimization. It'd be good to clarify
whether this is proceeding or not.
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