[jira] [Created] (FLINK-5956) Add retract method into the aggregateFunction

[Shang Yuanchun (Jira)]

Shaoxuan Wang created FLINK-5956:
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             Summary: Add retract method into the aggregateFunction
                 Key: FLINK-5956
                 URL: https://issues.apache.org/jira/browse/FLINK-5956
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
            Reporter: Shaoxuan Wang
            Assignee: Shaoxuan Wang


Retraction method is help for processing updated message. It will also very helpful for window Aggregation. This PR will first add retraction methods into the aggregateFunctions, such that on-going over window Aggregation can get benefit from it.



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