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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