etseidl commented on PR #9619:
URL: https://github.com/apache/arrow-rs/pull/9619#issuecomment-4565338642

   > However I think @HippoBaro also saw some potential strangeness with those 
runs, so maybe it is a measurement thing
   
   Indeed. From 
https://github.com/apache/arrow-rs/pull/9619#issuecomment-4564979349
   
   ```
   list_primitive/bloom_filter                        1.03    344.4±0.85ms  
1583.6 MB/sec    1.00    334.0±1.19ms  1632.7 MB/sec
   list_primitive/cdc                                 1.01    370.9±4.19ms  
1470.3 MB/sec    1.00    366.4±1.42ms  1488.3 MB/sec
   list_primitive/default                             1.04    265.8±2.08ms     
2.0 GB/sec    1.00    254.9±1.09ms     2.1 GB/sec
   list_primitive/parquet_2                           1.04    286.8±0.61ms  
1901.3 MB/sec    1.00    275.2±0.37ms  1981.6 MB/sec
   list_primitive/zstd                                1.01    511.1±1.95ms  
1067.0 MB/sec    1.00    505.2±0.67ms  1079.6 MB/sec
   list_primitive/zstd_parquet_2                      1.00    499.2±0.38ms  
1092.5 MB/sec    1.00    499.1±0.29ms  1092.7 MB/sec
   list_primitive_non_null/bloom_filter               1.06    439.4±7.70ms  
1238.7 MB/sec    1.00    416.0±4.34ms  1308.2 MB/sec
   list_primitive_non_null/cdc                        1.01   441.5±10.55ms  
1232.7 MB/sec    1.00    438.1±8.89ms  1242.1 MB/sec
   list_primitive_non_null/default                    1.08    306.4±7.96ms  
1776.5 MB/sec    1.00    283.9±2.85ms  1916.9 MB/sec
   list_primitive_non_null/parquet_2                  1.07    341.3±0.46ms  
1594.6 MB/sec    1.00    319.8±0.61ms  1701.6 MB/sec
   list_primitive_non_null/zstd                       1.01   712.0±15.97ms   
764.4 MB/sec    1.00    703.9±9.30ms   773.2 MB/sec
   list_primitive_non_null/zstd_parquet_2             1.01    692.1±9.08ms   
786.4 MB/sec    1.00    687.2±0.52ms   791.9 MB/sec
   ```


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