https://github.com/echoface/be_indexer

a extensible boolean expression index implementation, especially for RTB ad selection. both vldb09-indexing(Standford and Yahoo's paper) and roartingbitmap-based algorithem implemented

advertising bidding boolean-indexing roaringbitmap rtb

Last synced: 12 Jan 2026

https://github.com/echoface/proximityhash

generates a set of geohashes that cover a circular area, given the center coordinates and the radius

Last synced: 12 Jan 2026