lidavidm commented on pull request #9670:
URL: https://github.com/apache/arrow/pull/9670#issuecomment-796201473


   On a quick benchmark, this is a two orders of magnitude speedup! Though I'm 
also going to test some other scenarios + add unit tests.
   
   Before:
   
   ```
   ---------------------------------------------------------------
   Benchmark                     Time             CPU   Iterations
   ---------------------------------------------------------------
   GetAllFragments        83434318 ns     83433416 ns           17
   GetFilteredFragments  502654017 ns    502651704 ns            3
   ```
   
   After:
   
   ```
   ---------------------------------------------------------------
   Benchmark                     Time             CPU   Iterations
   ---------------------------------------------------------------
   GetAllFragments        72942933 ns     72941992 ns           19
   GetFilteredFragments    5630666 ns      5630548 ns          250
   ```


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