Github user shaoxuan-wang commented on the issue:
https://github.com/apache/flink/pull/3470
@fhueske sounds great. I updated the PR. Please take a look. I have add
non-retractable and retractable aggregates for MIN and MAX. And add a flag
parameter via AggregateUtil.transformToAggregateFunctions() to indicate if an
aggregate needs to support retract or not.
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