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https://issues.apache.org/jira/browse/BEAM-12228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17549267#comment-17549267
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Danny McCormick commented on BEAM-12228:
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This issue has been migrated to https://github.com/apache/beam/issues/20873
> 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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