public Stream<Hit> stream() {
        if (nPostingLists == 0) {
            return Stream.empty();
        }
        return StreamSupport.stream(new PredicateSpliterator(), false);
    }
@Test
    void requireThatEmptyPostingListsWork() {
        PredicateSearch search = createPredicateSearch(
                new byte[0],
                postingList(SubqueryBitmap.ALL_SUBQUERIES));
        assertEquals(List.of().toString(), search.stream().toList().toString());
    }