cloud-fan commented on PR #58317:
URL: https://github.com/apache/spark/pull/58317#issuecomment-5883374498

   The two scan modes are retained, but PreserveNative does not encode 
`spark.sql.readSideCharPadding`. Direct catalog V2 recache now removes the 
saved generated Project before re-analysis, so a write under the opposite 
read-side-padding value can rebuild the cache under a different policy and 
collapse two PreserveNative variants. Please capture or derive that flag when 
replaying the saved cache policy and add the cross-padding recache case.
   
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