alamb commented on PR #8160:
URL: https://github.com/apache/arrow-rs/pull/8160#issuecomment-3197769153

   > Also, I think this came up before, but only materializing the column index 
for columns being filtered on rather than for the entire schema would certainly 
help. Selectively writing them would be useful as well.
   
   Yes, absolutely. Another really useful thing would be not decoding the page 
index / column index unless it is needed -- for example if we can prune the 
entire row group just with the row group statistics, we shouldn't even have to 
bother to decode the page index for that 🤔 


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