public static Field p(String fieldName) {
        return SELECT_ALL_FROM_SOURCES_ALL.where(fieldName);
    }
@Test
    void contains_sameElement() {
        String q = Q.p("f1").containsSameElement(Q.p("stime").le(1).and("etime").gt(2))
                .build();

        assertEquals(q, "yql=select * from sources * where f1 contains sameElement(stime <= 1, etime > 2)");
    }