jhorstmann commented on issue #7909:
URL: https://github.com/apache/arrow-rs/issues/7909#issuecomment-3120456393

   @etseidl I updated my old branch with the macro generator at 
<https://github.com/jhorstmann/arrow-rs/tree/parquet-thrift-macros>, but did 
not get around to adding support for unknown union fields yet.
   
   The arbitrary name `__UNKNOWN__` feels a bit ugly, and its also slightly 
inconsistent with thrift enums that way. I guess one reason for doing enums as 
simple newtype wrappers is that you could theoretically end up with both 
`Encoding::RLE` and `Encoding::UNKNOWN(3)` meaning the same thing.


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