Github user shaoxuan-wang commented on the issue:
https://github.com/apache/flink/pull/3647
Thanks @fhueske, I overlooked a list is not always an arraylist. I change
it to scala array, but keep the type as integer, as this is type returned (and
not easy to be casted to Int) from aggregateCall.getArgList. I updated PR and
also rebased to the master (as I noticed there are a few over aggregates have
been recently merged), so it will be easier for you to merge.
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