@Test
public void testTable2() {

    // JENA-1468 : op to string and back.
    String qs = "SELECT * WHERE { ?x ?p ?z . VALUES ?y { } }" ;
    Query query = QueryFactory.create(qs); 
    Op op = Algebra.compile(query);
    String x = op.toString();
    Op op1 = SSE.parseOp(x);
    Query query2 = OpAsQuery.asQuery(op1);
    assertEquals(query, query2);
}