haohuaijin commented on PR #10443:
URL: https://github.com/apache/arrow-rs/pull/10443#issuecomment-5089491670

   Thanks. I reran the comparison three times on Apple M4; the results are 
attached. run64 remained between approximately -0.6% and +2.5%. run01 showed a 
larger regression in one run, but it was not reproduced in the other two. Since 
the cold path still uses the same mask_to_selectors implementation, the 
variation may be related to system noise, CPU frequency changes, or compiler 
code-layout differences.
   
   
   <img width="820" height="1015" alt="image" 
src="https://github.com/user-attachments/assets/fb6eb76b-3338-4f02-997e-d035077ca5fb";
 />
   


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