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https://issues.apache.org/jira/browse/BEAM-10216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17182773#comment-17182773
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Beam JIRA Bot commented on BEAM-10216:
--------------------------------------
This issue was marked "stale-P2" and has not received a public comment in 14
days. It is now automatically moved to P3. If you are still affected by it, you
can comment and move it back to P2.
> SESSION TVF Optimizations
> -------------------------
>
> Key: BEAM-10216
> URL: https://issues.apache.org/jira/browse/BEAM-10216
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql-zetasql
> Reporter: Rui Wang
> Priority: P3
>
> Current TVF Session has the following limitation:
> Use a "dummy" key to go through a GBK to compute window_start and window_end.
> This introduces an extra shuffle so it costs more.
> One optimizations we can do is always merge TableFunctionScanRel with
> AggregationRel (and also all Join Rel), thus we can use only one GBK to
> compute both SESSION window_start and window_end, and aggregations(joins).
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