haohuaijin opened a new issue, #11640:
URL: https://github.com/apache/arrow-rs/issues/11640

   Trimming a bitmap-backed `RowSelection` currently scans backwards byte by 
byte to locate the last selected row. This adds overhead for selections with 
long trailing runs of skipped rows.
   
   Scan 64-bit words instead, preserving support for sliced masks and non-zero 
bit offsets.
   
   Related PR: #11639


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