jayzhan211 commented on issue #11680:
URL: https://github.com/apache/datafusion/issues/11680#issuecomment-2264266980

   > What exactly does single_mode do? 
https://github.com/apache/datafusion/pull/11762 looks like maybe it just uses a 
single group by node?
   
   Yes, partial/final often do the hashing / row converter twice. In single 
group by node, there is only one.


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