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https://issues.apache.org/jira/browse/BEAM-10216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17548717#comment-17548717
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Danny McCormick commented on BEAM-10216:
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This issue has been migrated to https://github.com/apache/beam/issues/20340
> 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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