jiayuasu commented on issue #10260:
URL: https://github.com/apache/iceberg/issues/10260#issuecomment-2262098914

   Thank you all for the great discussion. We will focus on the Parquet 
geometry proposal for now, then come back to the Iceberg one.
   
   As I already commented in the Parquet Geometry proposal, according to the 
comment above, my suggestion is
   
   In the Parquet Geometry PR, we add a string field namely `crs_kind` in 
addition to the `crs` field. The only allowed value currently is `PROJJSON`. In 
the future, if there is a new OGC standard called `CRSJSON` that differs from 
`PROJJSON`, we will allow another value `CRSJSON`.
   
   For WKT2 2019 <-> PROJJSON, we will implement Java/C++ version of this 
library [rouault/projjson_to_wkt](https://github.com/rouault/projjson_to_wkt) 
so whoever wants to use WKT2 2019 CRS can use it to get it from the projjson 
string.


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