paleolimbot commented on issue #73:
URL: https://github.com/apache/arrow-nanoarrow/issues/73#issuecomment-1327917157

   A PR would be great! If you don't get there, an example of a real-world 
union you'd like to create would do and I can figure something out. This is 
about to come up in GeoArrow because we need it to represent multiple geometry 
types.
   
   One of the things I haven't understood in the union is the purpose of the 
`type_ids` in the schema: wouldn't either the child names or the child indices 
suffice?


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