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https://issues.apache.org/jira/browse/FLINK-5956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15895566#comment-15895566
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ASF GitHub Bot commented on FLINK-5956:
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Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3470
Thanks for the PR @shaoxuan-wang. I haven't had a detailed look yet. I
think we also need non-retract versions of `MIN` and `MAX`. The retracted
version cannot be used to compute unbounded OVER windows and will be less
efficient for batch queries (which do not need retraction).
Thanks, Fabian
> 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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