Github user stefanobortoli commented on the issue:
https://github.com/apache/flink/pull/3732
@fhueske I have just pushed a version working with code generation (without
modifying the code generation) There will be the need for some refactoring in
the AggregateUtil function, but if the overall concept is sound, I will fix
things.
@hongyuhong , @shijinkui you could also have a look if you have time.
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