Github user vasia commented on the pull request:
https://github.com/apache/flink/pull/1600#issuecomment-181794348
Thanks for the feedback @tillrohrmann, @twalthr!
I've moved the classes to `org.apache.flink.api.table.runtime` and tried to
shorten the aggregates code using Numerics. I only left `AvgAggregate` as is,
because integer average and float/double average are computed differently. We
can always replace it with code generation later as @twalthr suggested.
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