6.8.5.2 Executing SELECT Queries Against a PGX Session
The PgxSession.queryPgql(String query) method executes the
                given query in the session and returns a PgqlResultSet.
               
The ON clauses inside the MATCH
                        clauses, and the INTO clauses inside the
                                INSERT clauses, must be specified and cannot be
                        omitted. At this moment, all the ON and
                                INTO clauses of a query need to reference the same
                        graph since joining data from multiple graphs in a single query is not yet
                        supported.
               
Parent topic: Java APIs for Executing SELECT Queries