leesf commented on issue #7897: [FLINK-11817] Uses aggregate function in DataStream API Tutorial URL: https://github.com/apache/flink/pull/7897#issuecomment-469927116 @mikeholler you can see examples in [AggregateFunction](https://github.com/apache/flink/blob/master/flink-core/src/main/java/org/apache/flink/api/common/functions/AggregateFunction.java), and it becomes simple after investigating.
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