etseidl commented on PR #8190:
URL: https://github.com/apache/arrow-rs/pull/8190#issuecomment-3207935254

   From #8160 benchmark results (old is the original thrift, new is the 
reworked decoder)
   ```
   old
   open(page index)        time:   [1.7446 ms 1.7524 ms 1.7639 ms]
   
   new
   open(page index)        time:   [698.00 µs 699.75 µs 701.66 µs]
   ```
   
   With these changes the reading of the page index is now:
   ```
   open(page index)        time:   [613.47 µs 614.98 µs 616.68 µs]
   ```
   
   Note that the decoding of the column index is ~2/3 of the decoding time, so 
the speed up in the offset index decoding is considerable.
   
   Is this worth the added complexity is the question. No changes to the 
`PageLocation` struct are on the horizon, so maybe.


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