tustvold edited a comment on issue #506:
URL: https://github.com/apache/arrow-rs/issues/506#issuecomment-870620765


   @alamb what I'm proposing isn't "concat then cleanup". You build the keys 
array with the current dictionary encodings as if they had been concatenated 
together (but don't actually concatenate them). Then compute the new dictionary 
and re-encode the keys with this new dictionary. Is there some way to do better 
than this?


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