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https://issues.apache.org/jira/browse/BEAM-4720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17547254#comment-17547254
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Kenneth Knowles commented on BEAM-4720:
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This issue has been migrated to https://github.com/apache/beam/issues/19022
> Boundedness and Unboundedness as a trait of a Rel so we know during planning
> ----------------------------------------------------------------------------
>
> Key: BEAM-4720
> URL: https://issues.apache.org/jira/browse/BEAM-4720
> Project: Beam
> Issue Type: New Feature
> Components: dsl-sql
> Reporter: Kenneth Knowles
> Priority: P3
>
> Currently we do not know the boundedness or unboundedness of a collection
> until after planning is complete, so it cannot influence the plan. Instead,
> BeamJoinRel makes post-planning decisions about what sort of join to
> implement. We should move this into the planning phase. I think Calcite
> traits are the intended way to do this.
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