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https://issues.apache.org/jira/browse/CALCITE-4051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17128728#comment-17128728
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Rui Wang commented on CALCITE-4051:
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[~apilloud] Yes!
> SESSION TVF Optimizations
> -------------------------
>
> Key: CALCITE-4051
> URL: https://issues.apache.org/jira/browse/CALCITE-4051
> Project: Calcite
> Issue Type: Improvement
> Reporter: Rui Wang
> Priority: Major
>
> 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, thus we can use only one GBK to compute both SESSION
> window_start and window_end, and aggregations.
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