Jiayi Liao created FLINK-13854:
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Summary: Support Aggregating in Join and CoGroup
Key: FLINK-13854
URL: https://issues.apache.org/jira/browse/FLINK-13854
Project: Flink
Issue Type: New Feature
Affects Versions: 1.9.0
Reporter: Jiayi Liao
In WindowStream we can use windowStream.aggregate(AggregateFunction,
WindowFunction) to aggregate input records in real-time.
I think we should support similar api in JoinedStreams and CoGroupStreams,
because it's a very huge cost by storing the records log in state backend,
especially when we don't need the specific records.
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