alamb commented on issue #7683:
URL: https://github.com/apache/arrow-rs/issues/7683#issuecomment-2980689959

   The way StringView implemented this was to reuse the builder (and the code 
is super simple and reuses all the optimization that went into creating the 
StringView in the first place)
   
   
https://github.com/apache/arrow-rs/blob/a19fc628b96371b194c0e9c89174c3209adcd195/arrow-array/src/array/byte_view_array.rs#L473-L479
   
   Could we do something similar here (and reuse all the DictionaryArrayBuilder 
machinery 🤔 )


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