public static Field p(String fieldName) {
        return SELECT_ALL_FROM_SOURCES_ALL.where(fieldName);
    }
@Test
    void use_contains_instead_of_contains_equiv_when_input_size_is_1() {
        String q = Q.p("f1").containsEquiv(List.of("p1"))
                .build();

        assertEquals(q, "yql=select * from sources * where f1 contains \"p1\"");
    }