tustvold commented on PR #5057:
URL: 
https://github.com/apache/arrow-datafusion/pull/5057#issuecomment-1410224514

   > whose data falls within those ranges are scanned
   
   More specifically it is the row groups with a midpoint that falls into the 
range, this means that so long as the ranges are disjoint there is no risk of 
reading the same row group twice


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