unicorn(独角兽),里面类似于倒排链的reference list,相应的term如friend:2,表示entity 2的朋友列表,整个结构是shard的,上面是top aggregator,然后是rack aggreator,支持StrongOr,weakAnd,Difference操作。还有apply(如找朋友的朋友),extract,有个nosql图数据库neo4j也是类似的，仅仅是听说neo4j还不是分布式的:

http://db.disi.unitn.eu/pages/VLDBProgram/pdf/industry/p871-curtiss.pdf

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