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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2022/06/04 16:37:22 UTC

[GitHub] [beam] damccorm opened a new issue, #20340: SESSION TVF Optimizations

damccorm opened a new issue, #20340:
URL: https://github.com/apache/beam/issues/20340

   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).
   
   Imported from Jira [BEAM-10216](https://issues.apache.org/jira/browse/BEAM-10216). Original Jira may contain additional context.
   Reported by: amaliujia.


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