@SuppressWarnings("serial")
    public List<String> getPrimaryKeyOnlyName() {
        List<String> list = new ArrayList<>();
        for (Entry<String, ColumnMeta> entry : getPrimaryKeyMap().entrySet()) {
            list.add(entry.getKey());
        }
        return list;
    }
@Test
    public void testGetPrimaryKeyOnlyName() {
        List<String> pksName = tableMeta.getPrimaryKeyOnlyName();

        assertEquals(2, pksName.size());
        assertTrue(pksName.contains("col1"));
        assertTrue(pksName.contains("col2"));

    }