avantgardnerio commented on PR #4883:
URL: https://github.com/apache/arrow-rs/pull/4883#issuecomment-1741470653

   > dense unions
   
   Interesting. So with dense unions we use the same buffer to store both sets 
of values? Probably using the `offset_sz = max(size_of(a), size_of(b))`? and 
`ptr = index * offset_sz`? So there's no `.child(0)` and `.child(1)`?


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