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https://issues.apache.org/jira/browse/FLINK-16844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17081676#comment-17081676
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Benchao Li commented on FLINK-16844:
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[~lsy] Thanks for your feedback for this issue.
Maybe we should reach an agreement with a committer before doing the work.
And here we should be cautious to remove this limitation. In my understanding,
session window cannot support retract message. Even for tumble and hop window,
retract message also may cause other problems.
> Support retract message for StreamExecGroupWindowAggregate in blink planner
> ---------------------------------------------------------------------------
>
> Key: FLINK-16844
> URL: https://issues.apache.org/jira/browse/FLINK-16844
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner
> Reporter: Benchao Li
> Priority: Major
>
> Currently the `WindowOperator` in blink planner actually supports retract
> messages, however in StreamExecGroupWindowAggregate, we throws exception if
> input is retract. IMO, we can remove this check and let
> `StreamExecGroupWindowAggregate` support retract messages. This will enhance
> the ability of blink planner very much.
>
> cc [~jark]
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