adriangb commented on PR #22640:
URL: https://github.com/apache/datafusion/pull/22640#issuecomment-4597102954

   > The comparison now verifies: Field count Field data types Field names 
Field qualifiers
   
   If we are checking all of these, can’t we just compare the schemas 
themselves? What are we saving?
   
   And if we need to compare not just the first item in the union but all… is 
there even anything to cache?


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