@Override
    public boolean next() {
        if (rows.hasNext()) {
            currentRow = rows.next();
            return true;
        }
        return false;
    }
@Test
    void assertNext() {
        LocalDataQueryResultRow row = new LocalDataQueryResultRow("value");
        LocalDataMergedResult actual = new LocalDataMergedResult(Collections.singletonList(row));
        assertTrue(actual.next());
        assertFalse(actual.next());
    }