Yeah, it is textbook. It was textbook a decade and a half ago already. Add docids to sorted update lists. Zipper merge and arithmetic coding once lists get lar

Yeah, it is textbook. It was textbook a decade and a half ago already. Add docids to sorted update lists. Zipper merge and arithmetic coding once lists get large, is the textbook baseline from back then. Tack on a skip list, and you have fast intersections. This is well trodden ground.