Jefffrey commented on issue #11197:
URL: https://github.com/apache/arrow-rs/issues/11197#issuecomment-5825164847

   one consideration is if len is nonzero, how can we represent the length 
then? since we'll have no child ids to reference in the buffer
   
   might need to do some research on this since the format doesnt really 
specify this case:
   
   - https://arrow.apache.org/docs/format/Columnar.html#union-layout


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