brancz commented on issue #6356:
URL: https://github.com/apache/arrow-rs/issues/6356#issuecomment-2332102012

   Isn't that just an optimization though? I understand that if two dict IDs 
are identical one can just append the index arrays to each other safely, and if 
not then the dicts needs to be unified and indexes added transposed (using the 
terminology that the Go arrow package uses not sure it's universal it's just 
the library I have the most experience with).


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