paleolimbot commented on issue #49674:
URL: https://github.com/apache/arrow/issues/49674#issuecomment-4274378576

   I'm not an expert on these internals, but I can see how the 
DictionaryBuilder might not be able to guarantee the ordering of the keys that 
come out of it while preserving the dictionary indices emitted for previous 
rows. It seems like your approach is reasonable...make a PR and we can discuss 
there! 


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