Github user vasia commented on the pull request:
https://github.com/apache/flink/pull/1600#issuecomment-182392029
I've rebased this one on top of `tableOnCalcite` which includes #1595.
Regarding the average aggregate, I went for @tillrohrmann's suggestion of
adding 0.5. That means that an integer average of 1 and 2 will now return 2.
Note that in the previous implementation of the Table API this operation would
return 1 because integer average was maintaining a pair of sum and count.
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