pvary commented on PR #16747:
URL: https://github.com/apache/iceberg/pull/16747#issuecomment-4671995456

   What pattern should I test?
   This is what I tried, and what I have found:
   ```
   pattern                 set positions       Mumbling        Roaring    
Roaring + RLE     Parquet v2
   last 50k only                   50000           6491          16408          
     25            631
   random 1% + last 50k            53495          10472          22980          
   7509           4628
   random 10%                      40000          40636          50552          
  50552          27227
   random 20%                      80000          50111          51862          
  51862          42340
   random 5%                       20000          20871          40064          
  40064          16634
   ```


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