alamb commented on issue #8789:
URL: 
https://github.com/apache/arrow-datafusion/issues/8789#issuecomment-1885761550

   🤔  I don't really have any good reason / understanding of what is different
   
   I looked at q13 briefly which has the largest reported change and I don't 
really have any good explanation about why it is reported 8% slower.
   
   ![Screenshot 2024-01-10 at 3 46 22 
PM](https://github.com/apache/arrow-datafusion/assets/490673/ba19d96c-8ade-46b2-b9a0-9b21c4b45225)
   
   And I profiled running it locally, 
   ![Screenshot 2024-01-10 at 4 25 27 
PM](https://github.com/apache/arrow-datafusion/assets/490673/b62d2049-f5e9-4d87-8275-211f401cf9b3)
   
   It doesn't seem to show anything obvious -- the biggest offenders are 
managing the group keys which I don't think changed much


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