etseidl commented on issue #7299:
URL: https://github.com/apache/arrow-rs/issues/7299#issuecomment-3452607330

   > I don't know what's within the realms of possible with the new thrift 
parser
   
   Please check out #8714. I think this could be another use of the index. We 
skip over the column chunk metadata completely while decoding the row group 
metadata, and exit the latter once we have the row counts (num rows is the 
second varint, so this would be very fast).


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