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https://issues.apache.org/jira/browse/BEAM-8804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17121795#comment-17121795
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Kenneth Knowles commented on BEAM-8804:
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This issue is assigned but has not received an update in 30 days so it has been
labeled "stale-assigned". If you are still working on the issue, please give an
update and remove the label. If you are no longer working on the issue, please
unassign so someone else may work on it. In 7 days the issue will be
automatically unassigned.
> PCollectionList support in cross-language transforms
> ----------------------------------------------------
>
> Key: BEAM-8804
> URL: https://issues.apache.org/jira/browse/BEAM-8804
> Project: Beam
> Issue Type: Improvement
> Components: beam-model
> Reporter: Heejong Lee
> Assignee: Heejong Lee
> Priority: P2
> Labels: stale-assigned
>
> Currently, Beam model doesn't have any information on the order of
> input/output PCollections from PTransforms. Therefore, PCollectionList needs
> to be converted to PCollectionTuple when it goes across the cross-language
> boundaries (or even in the same language, whenever it is converted between
> in-memory object and proto) and it's impossible to recreate PCollectionList
> from proto with the original order. The possible workaround is just to use
> PCollectionTuple with integer id (starting from 0 like indexes) instead of
> PCollectionList. In that case, we should first well-define how we generate
> proto from PCollectionList since each SDK uses a different convention.
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