abhishekagarwal87 commented on issue #10857:
URL: https://github.com/apache/druid/issues/10857#issuecomment-773906829


   Hi Gummybearr,
   1) Druid uses roaring (https://github.com/RoaringBitmap) and concise bitmap 
for bitmap indexes and these libraries have built-in implementations for and/or 
   2) Druid makes these indexes by itself.
   


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