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https://issues.apache.org/jira/browse/FLINK-16844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17081669#comment-17081669
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dalongliu commented on FLINK-16844:
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+1, I have similar needs in production which require WindowOperator can receive
retract messages , [~libenchao], have you start the work now?
> 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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