Github user maropu commented on the pull request: https://github.com/apache/spark/pull/3247#issuecomment-88711084 @chenghao-intel I'm also with your refactoring idea though, it's too big to merge into the master in bulk. ISTM this patch is better to split into some small ones. e.g.) - a patch to remove DISTINCT aggregator expression - a patch to simplify buffering codes in Aggregate - a patch to improve hive integration (Mode, or something) - ... Thought? Anyway, I'm interested in your UDTF and UDAF refactoring activities, and so I'd like to join that.
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