public static Field p(String fieldName) {
        return SELECT_ALL_FROM_SOURCES_ALL.where(fieldName);
    }
@Test
    void build_query_which_created_from_Q_b_without_select_and_sources() {
        String q = Q.p("f1").contains("v1")
                .build();

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