paleolimbot commented on issue #8717:
URL: https://github.com/apache/arrow-rs/issues/8717#issuecomment-3451605821

   Thank you for opening!
   
   The required conversion between an Arrow extension type and the Parquet 
logical types are prototyped in https://github.com/apache/arrow-rs/pull/8222 
and here are a few relevant comments:
   
   https://github.com/apache/arrow-rs/pull/8222#discussion_r2299643001
   
   https://github.com/apache/arrow-rs/pull/8222#discussion_r2299657546
   
   ...and the Arrow C++ implementation:
   
   
https://github.com/apache/arrow/blob/f8b20f131a072ef423e81b8a676f42a82255f4ec/cpp/src/parquet/geospatial/util_json_internal.cc#L47-L81
   
   
https://github.com/apache/arrow/blob/f8b20f131a072ef423e81b8a676f42a82255f4ec/cpp/src/parquet/geospatial/util_json_internal.cc#L105-L125
   
   The conversion is sufficiently compact (and Parquet-specific) that I think 
parquet-geospatial is a good spot for it (and I think a circular dependency 
would incur from using the implementation in `geoarrow-schema`).


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