rdblue commented on PR #18405:
URL: https://github.com/apache/iceberg/pull/18405#issuecomment-6351431230

   @pvary, this is independent of derived or generated column expressions. This 
covers values that are represented only in stats, like alternative lower/upper 
bounds (`to_lower_case(str)`) or bucket partition values.
   
   Generated columns would be more like default value expressions, where the 
expression is embedded directly in the schema. I considered generalizing this, 
but generated columns need to be in the schema and that means they already have 
field IDs. Involving this work would just make that feature more complicated.


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