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https://issues.apache.org/jira/browse/BEAM-4721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17547273#comment-17547273
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Kenneth Knowles commented on BEAM-4721:
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This issue has been migrated to https://github.com/apache/beam/issues/19041
> WindowingStrategy, Window fields in the project as a trait of a Rel
> -------------------------------------------------------------------
>
> Key: BEAM-4721
> URL: https://issues.apache.org/jira/browse/BEAM-4721
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql
> Reporter: Kenneth Knowles
> Priority: P3
>
> Currently, WindowingStrategy is just a property of a PCollection but is
> unknown during planning. As with boundedness / unboundedness, this should be
> available statically so it can affect the plan. It may not be literally a
> WindowingStrategy object, but a SQL-level equivalent.
> One windowing-related thing that is interesting is which fields represent the
> window. If we know this, then we know we can support per-window equijoins as
> long as a join condition also does an equijoin on the window.
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