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https://issues.apache.org/jira/browse/BEAM-11715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17279324#comment-17279324
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Chamikara Madhusanka Jayalath commented on BEAM-11715:
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Done. Please send a cherry-pick as well.
> Combiner packing creates an incorrect proto
> -------------------------------------------
>
> Key: BEAM-11715
> URL: https://issues.apache.org/jira/browse/BEAM-11715
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Chamikara Madhusanka Jayalath
> Assignee: Yifan Mai
> Priority: P1
> Fix For: 2.28.0
>
> Time Spent: 8h
> Remaining Estimate: 0h
>
> Seems like optimization creates a CombinePerKey transform that does not have
> any sub-transforms. We should fix this by preserving the old structure for
> CombinePerKey (GBK+CombineValues composite).
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