alamb commented on PR #9755:
URL: https://github.com/apache/arrow-rs/pull/9755#issuecomment-4623276174

   > > detect the case where the existing code does better
   > 
   > This does cost a little and that's why some cases are 1% slower. :(
   
   I am not worried about 1% slower, I [wm worried about the 
cases](https://github.com/apache/arrow-rs/pull/9755#issuecomment-4616868737) 
that look like they are more like 2x slower, such as
   
   
   > filter: mixed_binaryview (max_string_len=8), 8192, nulls: 0, selectivity: 
0.1                      1.89  1623.8±12.16µs        ? ?/sec     1.00    
858.6±4.38µs        ? ?/sec
   
   
   The filter code is already quite well optimized so I can see it is hard to 
beat this.


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