Dandandan edited a comment on issue #790:
URL: 
https://github.com/apache/arrow-datafusion/issues/790#issuecomment-894016110


   Some good news, this is quite like mostly an improvement on the (more 
challenging) db-benchmark aggregates.
   
   Master:
   ```
   q1 took 37 ms
   q2 took 325 ms
   q3 took 1431 ms
   q4 took 56 ms
   q5 took 1287 ms
   q7 took 1304 ms
   q10 took 9380 ms
   ```
   
   PR:
   ```
   q1 took 36 ms
   q2 took 360 ms
   q3 took 1002 ms
   q4 took 67 ms
   q5 took 984 ms
   q7 took 924 ms
   q10 took 4024 ms
   ```
   
   Performance of q10 is improved > 2x!
    It looks like q2 and q4 are slightly slower (repeatedly), but I think the 
overall improvement is too big to matter that much. 


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