Worst Case Optimal Joins: Graph-Join Correspondence

Part of a series:

- https://finnvolkel.com/wcoj-generic-join

- https://finnvolkel.com/wcoj-datalog-and-genericjoin

- https://finnvolkel.com/wcoj-dbsp-zsets-and-datalog

- https://finnvolkel.com/wcoj-wcoj-meets-dbsp