alamb commented on issue #1652:
URL: 
https://github.com/apache/arrow-datafusion/issues/1652#issuecomment-1023624424


   > This is nice 👍 . By dictionary-based row group filtering I mean we can 
first decode only the dictionary pages for the column chunks where pushed down 
predicates (e.g., in predicate) are associated to, and skip the whole row group 
if no keys in the dictionary match.
   
   this would definitely be a neat optimization


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