public static Select select(String fieldName) { return new Select(fieldName);
    }
@Test
    void select_specific_fields() {
        String q = Q.select("f1", "f2")
                .from("sd1")
                .where("f1").contains("v1")
                .build();

        assertEquals(q, "yql=select f1, f2 from sd1 where f1 contains \"v1\"");
    }