notfilippo commented on issue #11513:
URL: https://github.com/apache/datafusion/issues/11513#issuecomment-2247350154

   > Instead of LogicalPhysicalType + LogicalPhysicalSchema to keep track of 
the relationship between the logical and physical type, could we get the 
unidirectional mapping of logical type from physical type?
   
   Oh now I understand. It makes sense to do it this way but it would lose the 
ability of potentially adding new [arrow-compatible physical 
encodings](https://arrow.apache.org/docs/format/Columnar.html#extension-types) 
(e.g. logical `Utf8` with physical `List(UInt8)`)


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