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https://issues.apache.org/jira/browse/FLINK-11002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16714750#comment-16714750
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Aljoscha Krettek commented on FLINK-11002:
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As of FLINK-4994 this is the intended behaviour. But I do realise that this can
confuse some users so I'm open to discussion.
However, Triggers are a very tricky business. 😅
> Trigger.clear() will not be called after purged window
> ------------------------------------------------------
>
> Key: FLINK-11002
> URL: https://issues.apache.org/jira/browse/FLINK-11002
> Project: Flink
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.6.2
> Reporter: Yuan Yifan
> Priority: Major
>
> The `clear` method
> (org.apache.flink.streaming.api.windowing.triggers.Trigger#clear) will not be
> called while return a `TriggerResult.FIRE_AND_PURGE` in
> onElement/onProcessingTime/onEventTime, this may cause the trigger can't
> purge after trggered the condition.
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