scovich commented on PR #8141:
URL: https://github.com/apache/arrow-rs/pull/8141#issuecomment-3189644449

   While adding the tests, it turns out that I need the read-only metadata 
builder. Otherwise, there's no way to add (or copy) individual object fields 
across -- even if the set of strings is the same, they would get newly 
allocated field ids in the output variant, potentially in a different order. 


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