etseidl commented on issue #8517:
URL: https://github.com/apache/arrow-rs/issues/8517#issuecomment-3374373971

   Only good news now. I've removed some of the worst `convert_` functions with 
and without encryption support. Benchmarks look good.
   ```
   group                             gh5854                                 
no_conv
   -----                             ------                                 
-------
   decode parquet metadata           1.08     19.5±0.37µs        ? ?/sec    
1.00     18.1±0.35µs        ? ?/sec
   decode parquet metadata (wide)    1.14     90.7±3.11ms        ? ?/sec    
1.00     79.6±1.52ms        ? ?/sec
   open(default)                     1.13     21.2±0.64µs        ? ?/sec    
1.00     18.8±0.52µs        ? ?/sec
   open(page index)                  1.00    257.5±5.27µs        ? ?/sec    
1.00    257.0±4.10µs        ? ?/sec
   ```
   
   I have noticed, however, that there is a regression due to the encryption, 
even for calls that are encryption unaware (the "decode parquet metadata" 
benches).
   ```
   group                             no_conv                                
no_conv_no_encr
   -----                             -------                                
---------------
   decode parquet metadata           1.04     18.1±0.35µs        ? ?/sec    
1.00     17.4±0.72µs        ? ?/sec
   decode parquet metadata (wide)    1.07     79.6±1.52ms        ? ?/sec    
1.00     74.3±1.67ms        ? ?/sec
   open(default)                     1.04     18.8±0.52µs        ? ?/sec    
1.00     18.0±0.31µs        ? ?/sec
   open(page index)                  1.01    257.0±4.10µs        ? ?/sec    
1.00    255.1±5.80µs        ? ?/sec
   ```


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