Presumably it refers to edges in an object graph [0]. EdgeDB seems to be currently deployed as a management, schema, and graph-to-sql translation layer for PostgreSQL.
[0] https://www.edgedb.com/blog/edgedb-a-new-beginning#edgedb.
[0] https://www.edgedb.com/blog/edgedb-a-new-beginning#edgedb.
Anyone care to explain why is that? I thought the query plan should be the same for JOINs and subqueries.