public Stream<Hit> stream() {
        if (nPostingLists == 0) {
            return Stream.empty();
        }
        return StreamSupport.stream(new PredicateSpliterator(), false);
    }
@Test
    void requireThatNoStreamsReturnNoResults() {
        PredicateSearch search = new PredicateSearch(new ArrayList<>(), new byte[0], new byte[0], new short[0], 1);
        assertEquals(0, search.stream().count());
    }