[jira] [Created] (FLINK-13854) Support Aggregating in Join and CoGroup

[Shang Yuanchun (Jira)]

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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