alamb commented on PR #8649:
URL: https://github.com/apache/arrow-rs/pull/8649#issuecomment-3559845773

   Update here is that in order to maintain backwards compatibility we changed 
the behavior in
   - https://github.com/apache/arrow-rs/pull/8890
   
   So that `non-null` is printed when the column is not nullable, rather than 
printing `nullable`. This aligns more closely with SQL and it is backwards 
compatible with prior releases where `List(Int64)` meant a nullable list of 
Int64 elements
   
   For example
   
   * Instead of `List(nullable Int64)` --> `List(Int64)`
   * Instead of `List(Int64)` --> `List(non-null Int64)` 
   
   


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