@Override
    public List<String> nullPartitionValueList() {
        return ImmutableList.of("__DEFAULT_PARTITION__", "null");
    }
@Test
    public void testInit() {
        PaimonPartitionKey paimonPartitionKey = new PaimonPartitionKey();
        assertEquals(paimonPartitionKey.nullPartitionValueList(), ImmutableList.of("__DEFAULT_PARTITION__", "null"));
    }