Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/834#issuecomment-112116663
Yes, I see your point. Also, right now an expression like "a.count, a.sum"
(where a only contains 0 or 1) returns different results if field a is null for
some rows. This could be fixed by only counting fields that are non-null.
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