Pilosa actually uses Roaring internally for bitmap compression (in fact, one of the Pilosa devs did the first port of Roaring from Java to Go). One difference i

Pilosa actually uses Roaring internally for bitmap compression (in fact, one of the Pilosa devs did the first port of Roaring from Java to Go). One difference is that really wide bitmaps are sharded and distributed among nodes in the cluster. This allows Pilosa to parallelize the work of doing bitwise operations on high cardinality data.