alamb commented on PR #21456:
URL: https://github.com/apache/datafusion/pull/21456#issuecomment-4226341190

   > Query 0 in clickbench_extended dataset (which uses count distinct on u8 is 
now ~ 11 % faster :
   
   THe benchmark runner doesn't seem to be able to reproduce that result 🤔 
   
   Also the microbenchmarks seem to still show a 10% slowdown: 
https://github.com/apache/datafusion/pull/21456#issuecomment-4225505082
   
   For i64 which isn't changed by this patch
   
   ```
   count_distinct i64 80% distinct    1.00    101.5±0.26µs        ? ?/sec    
1.11    112.9±0.36µs        ? ?/sec
   count_distinct i64 99% distinct    1.00    102.1±0.21µs        ? ?/sec    
1.13    115.1±0.46µs        ? ?/sec
   ```


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