bharadwaj-pendyala commented on PR #11257:
URL: https://github.com/apache/arrow-rs/pull/11257#issuecomment-5945225607

   Both reruns agree on the only-valid rows: 2.6x at kept 1/4, 3.1-3.2x at 
1023/2048, 1.8x at 1/2048.
   
   The nulls-at-end dense row came out worse than my PR description says, 
though. It went from 5.5-5.6 µs to 6.4 µs (14% and 18%), against the ~7% I 
measured on my M1. That row is the worst case on purpose, with the one selected 
null in the last word, so the scan reads both bitmaps in full before 
`filter_bits` reads them again. I've fixed the number in the description.
   


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