Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/3247#issuecomment-88792541
OK, I got your mean, as I put into the description of this PR, we want to
make a unified UDAF interface in this PR, `DISTINCT` is quite critical for this
purpose, we don't want to change the API definition again and again, right?
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