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https://issues.apache.org/jira/browse/BEAM-3297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16279603#comment-16279603
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Kenneth Knowles commented on BEAM-3297:
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Empty bundles are permitted, and I think it is permissible for an SDK harness
to call StartBundle and FinishBundle with no intervening elements. It is
pointless, of course, and might have a cost.
> 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
> Assignee: Henning Rohde
> Priority: Minor
>
> I believe the semantics is lazy. Exec currently calls SB/FB eagerly
> irrespectively of whether any elements are emitted.
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