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https://issues.apache.org/jira/browse/BEAM-1282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15830619#comment-15830619
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Daniel Mills commented on BEAM-1282:
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It's potentially useful to output in finishBundle; agreed that there's much
less use for doing so in startBundle. Currently they both get the same type of
Context, but we could split them up
> DoFnTester should allow output() calls in start/finishBundle
> ------------------------------------------------------------
>
> Key: BEAM-1282
> URL: https://issues.apache.org/jira/browse/BEAM-1282
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Daniel Mills
> Priority: Minor
> Labels: starter
>
> In a DoFn, users can call output() or outputWithTimestamp() during
> start/finishBundle. This will attempt to deduce a window for the output
> element based on the current WindowFn and any timestamp provided. However,
> DoFnTester always throws an exception if these methods are called from
> start/finishBundle (because it does not have a WindowFn, so that will have to
> be enhanced)
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