alamb commented on PR #9372:
URL: https://github.com/apache/arrow-rs/pull/9372#issuecomment-5217749936

   Here are some follow ups suggested by claude
   
   1. If the first data page of a column chunk has zero non-null values, 
build_preset(&[]) fixes the scale at 10^0, so every non-integer value in all 
later pages of that chunk becomes an exception 
   
   Since an all-null leading page is a realistic input, this is probably 
something we should fix (as a follow on PR)
   
   2. parquet-rewrite CLI (parquet/src/bin/parquet-rewrite.rs:147) doesn't 
expose ALP as an encoding option.
   


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