Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/6762#issuecomment-117886092
Thank you all for the comments, I've updated the code.
BTW, all of the `AutoCastInputTypes` expression, ideally should override
the `checkInputDataTypes` methods, I just leave it for the further improvement,
as it seems a generic problem, not only about this PR.
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