hhhizzz commented on PR #8733:
URL: https://github.com/apache/arrow-rs/pull/8733#issuecomment-3468441165

   Use `cargo bench --bench row_selection_state ` can test the relationship 
between the length of rowselection and time consuming. 
   On my M2 Mac Macbook:
   <img width="1780" height="980" alt="output-2" 
src="https://github.com/user-attachments/assets/b9ec3d74-d208-4dcc-8b0f-fc1d75e34046";
 />
   when the length is `15`, the perf of the bit mask and rowselector could be 
the same.
   
   On codespace AMD EPYC 7763 64-Core Processor (4 core)
   <img width="2053" height="980" alt="output" 
src="https://github.com/user-attachments/assets/8cc63778-58f9-4303-8b4e-e09e784b910e";
 />
   The Cross comes to around `30`
   


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