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https://issues.apache.org/jira/browse/BEAM-1955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546355#comment-17546355
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Kenneth Knowles commented on BEAM-1955:
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This issue has been migrated to https://github.com/apache/beam/issues/18236
> mapOutputs doesn't permit one replacement PValue to be used to represent
> multiple original PValues
> --------------------------------------------------------------------------------------------------
>
> Key: BEAM-1955
> URL: https://issues.apache.org/jira/browse/BEAM-1955
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Reporter: Thomas Groh
> Priority: P3
>
> It's not forbidden for a runner to replace outputs in this manner, but not
> currently possible based on the type signatures (PValue is a key into the
> map, and thus cannot be duplicated)
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