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https://issues.apache.org/jira/browse/BEAM-3297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16323367#comment-16323367
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Henning Rohde commented on BEAM-3297:
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Thanks Luke. In that case, the current behavior is the desired one.
> StartBundle/FinishBundle should be called only if there are elements
> ---------------------------------------------------------------------
>
> Key: BEAM-3297
> URL: https://issues.apache.org/jira/browse/BEAM-3297
> Project: Beam
> Issue Type: Bug
> Components: sdk-go
> Reporter: Henning Rohde
> Priority: Minor
> Fix For: Not applicable
>
>
> I believe the semantics is lazy. Exec currently calls SB/FB eagerly
> irrespectively of whether any elements are emitted.
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