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https://issues.apache.org/jira/browse/BEAM-3588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546816#comment-17546816
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Kenneth Knowles commented on BEAM-3588:
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This issue has been migrated to https://github.com/apache/beam/issues/18646
> Reject invalid windowing configurations
> ---------------------------------------
>
> Key: BEAM-3588
> URL: https://issues.apache.org/jira/browse/BEAM-3588
> Project: Beam
> Issue Type: Improvement
> Components: beam-model
> Reporter: Anton Kedin
> Priority: P3
>
> GBK (and consequently Beam SQL aggregations) rejects
> GlobalWindows+DefaultTrigger combination.
> * are there more of known unsupported window/trigger combinations?
> * should Repeatedly.forever(AfterWatermark.pastEndOfWindow()) be allowed
> where DefaultTrigger isn't? At what level should this stop?
> * can some version of this problem be solved analytically in general case?
> * should there be a separate validation component on a higher level above GBK?
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