wesm commented on pull request #7545:
URL: https://github.com/apache/arrow/pull/7545#issuecomment-658465856


   I think the rationale is that the memory and performance savings related to 
materializing the partition columns are mostly related to string data. So it's 
definitely beneficial to return them as dictionary types.
   
   IMHO if there is a change from dictionary/dense required post-1.0.0 it is 
not the end of the world, so I'm OK either with merging this as is or changing 
all partition types to be dictionary. 


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