Fokko commented on issue #15058:
URL: https://github.com/apache/arrow/issues/15058#issuecomment-1687861131

   @pitrou That's true, for PyIceberg it is about maintaining the type 
information. We have converters to go from and to Iceberg ⇔ PyArrow schemas. 
Going from Iceberg an Iceberg UUID to a `fixed[16]` in Arrow works, but we can 
not go back.
   
   > (in general, people seem to think that UUID gives them something better 
than pure random strings, for whatever cargo-culted reason)
   
   We'll you want to avoid utf8 if not needed. In Iceberg the UUID is also 
often used to apply bucket partitioning, which works well on fixed 16 bytes.


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