albertlockett opened a new pull request, #7611:
URL: https://github.com/apache/arrow-rs/pull/7611

   # Which issue does this PR close?
   
   Part of https://github.com/apache/arrow-rs/issues/7610
   
   # Rationale for this change
   
   
   I'm adding this because I would like to have a more efficient method for 
upgrading the key type of a dictionary builder in the case where my dictionary 
keys have overflowed.
   
   # What changes are included in this PR?
   
   
   This adds a method called `try_new_from_builder` to 
`GenericByteDictionaryBuilder` that can be used to construct a new builder from 
the passed argument with the same keys and internal state, but a keys array 
builder of a different type (the idea being that the new type could hold more 
values).
   
   # Are there any user-facing changes?
   
   


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