adriangb commented on PR #20497:
URL: https://github.com/apache/datafusion/pull/20497#issuecomment-4058645484

   @sdf-jkl could you help me with some napkin math on how this optimization 
works? Is the idea that applying a row selection when a page index is present 
is more efficient? I'm not sure if that means we should filter columns that 
have a page index first or last, and how that would weigh against e.g. the size 
of the column or the selectivity of the filter 🤔


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