lidavidm commented on pull request #11022:
URL: https://github.com/apache/arrow/pull/11022#issuecomment-914434619


   Changes:
   - We always unify dictionaries now.
   - Since this generates fresh dictionaries, to make testing easier, the 
dictionary variant of the kernel is compared against the non-dictionary 
variants.
   - Refactored the various changes in the dictionary builders; handle nulls in 
dictionaries by emitting null indices (note that this means that we won't 
generate dictionaries with nulls even if we get such dictionaries in the inputs)


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