haohuaijin commented on PR #10141:
URL: https://github.com/apache/arrow-rs/pull/10141#issuecomment-5066534191

   Thanks for your review @alamb 
   
   i filed follow-up issues to track some performance improve
   
   - #10422 — reuse the lazy selector cache in `into_selectors_vec` (review 
finding 4)
   - #10423 — avoid eager mask→RLE expansion in mixed `intersection`/`union` 
(review finding 6)
   - #10424 — split up `selection/mod.rs`
   - #10425 — in-place bitwise ops for `intersect_masks`/`union_masks`
   
   The `RowSelectionIter` slice-iterator specializations (review finding 5) are 
addressed in this PR directly in 
[86610b5](https://github.com/apache/arrow-rs/pull/10141/commits/86610b5bbb3a2a91c7cae070eddbb57fff24e015)
 and 
[bdf2726](https://github.com/apache/arrow-rs/pull/10141/commits/bdf2726c21930d5264b49c751c9b5c8f0fc569c4)
   
   cc @hhhizzz 


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