rshkv opened a new pull request, #7101:
URL: https://github.com/apache/arrow-rs/pull/7101

   Closes #7100 by allowing overrides of the key field on `MapBuilder` through 
a new method called `MapBuilder::with_key_field`.
   
   The goal of this is to support setting field metadata which, e.g., 
`iceberg-rust` uses to assign field ids.
   
   (Linking the `with_value_field` PR for reference: #5483)


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