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https://issues.apache.org/jira/browse/BEAM-12228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17378503#comment-17378503
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Beam JIRA Bot commented on BEAM-12228:
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This issue was marked "stale-P2" and has not received a public comment in 14
days. It is now automatically moved to P3. If you are still affected by it, you
can comment and move it back to P2.
> Composites that return another transforms output are overridden incorrectly
> ---------------------------------------------------------------------------
>
> Key: BEAM-12228
> URL: https://issues.apache.org/jira/browse/BEAM-12228
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Reporter: Kenneth Knowles
> Priority: P3
>
> The TransformHierarchy considers any transform that returns another
> transform's output to be a "composite". A.K.A. not a primitive. A primitive
> produces its own output.
> But a composite that returns its input and _also_ feeds that input to an
> internal transform is rewired incorrectly. Because the output is replaced
> with the original, causing the internal PCollection to be incorrect.
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