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https://issues.apache.org/jira/browse/BEAM-230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15702714#comment-15702714
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Kenneth Knowles commented on BEAM-230:
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This wasn't actually removed completely.
> Remove WindowedValue#valueInEmptyWindows
> ----------------------------------------
>
> Key: BEAM-230
> URL: https://issues.apache.org/jira/browse/BEAM-230
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Thomas Groh
> Assignee: Kenneth Knowles
> Labels: backward-incompatible
> Fix For: Not applicable
>
>
> A WindowedValue in no windows does not exist, and can be dropped by a runner
> at any time.
> We should also assert that any collection of windows is nonempty when
> creating a new WindowedValue. If a user wants to drop an element, they should
> explicitly filter it out rather than expecting it to be dropped by the runner.
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