bkietz opened a new issue, #566:
URL: https://github.com/apache/arrow-nanoarrow/issues/566

   Arrow C++ includes factories for constructing schemas, types, fields, and 
metadata which allow construction of even deeply nested structures to be 
expressive:
   
   ```c++
   schema({
     field("some_col", int32(), key_value_metadata({
       {"some_key_field", "some_value_field"},
     })),
   }, key_value_metadata({{"some_key", "some_value"}})),
   ```
   
   It should be straightforward to write equivalent factories which build a 
`nanoarrow::UniqueSchema`.


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