You don't need it because since reads don't touch network you can run multiple queries with JVM code interspersed wth no network cost. So in your example you ca

You don't need it because since reads don't touch network you can run multiple queries with JVM code interspersed wth no network cost. So in your example you can query two sets seperately and do a set difference in your app process. Doing it in app process scales horizontally, doing the same thing in the database process (like SQL) scales vertically. So if they were to implement this in datalog, per my understanding they would probably be doing it in your process anyway.