jhorstmann commented on PR #7937:
URL: https://github.com/apache/arrow-rs/pull/7937#issuecomment-3079315481

   > The bechmak results also look good to me -- the only one that reports 
something slow is already so fast I think it is mostly measurement error
   > 
   > > sort primitive run 2^12                                 1.00      
6.4±0.02µs        ? ?/sec    1.12      7.2±0.02µs        ? ?/sec
   
   I agree, probably measurement overhead. But `sort_to_indices` for run end 
encoded arrays does actually call `partition_validity` and then ignores the 
result, so it's also possible that the compiler previously optimized that away. 
I'll take another look and maybe handle ree arrays earlier in that function.


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