wjones127 commented on PR #35298:
URL: https://github.com/apache/arrow/pull/35298#issuecomment-1520462342

   > Good catch! I missed that. My question: is there any chance to prevent 
creating invalid sub-field names of map type?
   
   Some implementations will generate them now. Rust uses non-standard names, 
but maps the names to the compliant ones when writing IPC files for the 
integration test:
   
   
https://github.com/apache/arrow-rs/blob/6099864180b9a42472bd0a0a17d16a1b612902f4/arrow-integration-testing/src/bin/arrow-json-integration-test.rs#L116-L156
   
   


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