paleolimbot commented on PR #45459:
URL: https://github.com/apache/arrow/pull/45459#issuecomment-2826346276

   I think this is ready for another round when time allows! A few notes:
   
   - @jorisvandenbossche mentioned in a recent GeoParquet sync that it might be 
nice if the GEOMETRY type was written even if the type was not registered 
(i.e., only field metadata were present). I'd like to avoid that in this PR 
just because it's also a change with respect to the other types we currently 
handle.
   - The bounding boxes I believe are synced with our discussion at 
https://github.com/apache/parquet-format/pull/494 . I opened a follow-up to 
ensure we can get a null count for geospatial types and I'm happy to give that 
a go after this merges.
   - The example files are written using the latest version of this, and 
include some Python tests. I'm happy to move the Python tests here after the 
example files are in parquet-testing ( 
https://github.com/apache/parquet-testing/pull/70 ).
   
   I know this has gotten quite large but if possible I hope this can merge 
relatively early in the 21.0.0 release cycle so that we (and others) can 
experiment with the nightly Python builds and identify issues arising from some 
target use cases. Let me know what any next steps are on my end!


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