Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/551#issuecomment-96986771
Great job! The interface looks nice to me. Even though some parts seem to
need more optimization, it would take more time. I think that the current patch
seems to be ready to be committed because the interface and the code skeleton
are great. We can do more optimization later.
I have one comment. Could you rename isUdf to others like isScalarFunction
or isAggregationFunction? It would be more intuitive, I think.
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