scovich commented on PR #8185:
URL: https://github.com/apache/arrow-rs/pull/8185#issuecomment-3207720194

   > As I understand it, this prepares the signatures for a type of 
`VariantBuilder` that has immutable metadata (so that trying to add a field 
without an existing dictionary entry will fail) but not yet done
   
   Correct! Duplicate field name (normal builder) or unknown field name 
(read-only builder) will both fail in the same way.


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