jorgecarleitao opened a new issue #681:
URL: https://github.com/apache/arrow-rs/issues/681


   The dictionary metadata in FFI (and IPC AFAIK) stores not only the type, but 
also a name and nullability of the dictionary of the array. However, we 
currently can't store that information in `DataType::Dictionary`, therefore 
failing to roundtrip it.
   
   Changing it to `DataType::Dictionary(DataType,Field)` (with the boxes for 
sizing) would allow these rountrips.
   
   (Note, this is not 100% certain for me; I am opening the discussion here)


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