Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3771
If we merge this change together with #3764, we would check it with tests
that use distinct grouped window aggregates.
But you are right, it might in fact make sense to test the
`GeneratedAggregations` class generated by the `CodeGenerator` individually in
a unit test. I wouldn't make this as part of this PR though.
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