[GitHub] [spark] wangyum opened a new pull request, #36790: [SPARK-39402][SQL] Optimize ReplaceCTERefWithRepartition to support coalesce partitions

Tue, 07 Jun 2022 09:17:40 -0700 


wangyum opened a new pull request, #36790:
URL: https://github.com/apache/spark/pull/36790

   ### What changes were proposed in this pull request?
   
   Optimize `ReplaceCTERefWithRepartition` to support coalesce partitions. For 
example:
   
   Before this PR | After this PR
   -- | --
   
![image](https://user-images.githubusercontent.com/5399861/172430973-feb5de0c-373b-4a66-be49-d25648dcd24a.png)
 | 
![image](https://user-images.githubusercontent.com/5399861/172431034-5c5aa7c4-1cc5-4922-8fb0-a703cd6e9fec.png)
   
   ### Why are the changes needed?
   
   Reduce the overhead of shuffle as much as possible.
   
   ### Does this PR introduce _any_ user-facing change?
   
   No.
   
   ### How was this patch tested?
   
   Unit test.


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