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https://issues.apache.org/jira/browse/BEAM-8804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17548232#comment-17548232
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Danny McCormick commented on BEAM-8804:
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This issue has been migrated to https://github.com/apache/beam/issues/19877
> 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
> Priority: P3
>
> 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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