@Test
public void testExtShareTheBase() {

    KylinConfig config = KylinConfig.getInstanceFromEnv();
    Map<String, String> override = Maps.newHashMap();
    KylinConfig configExt = KylinConfigExt.createInstance(config, override);
    assertTrue(config.properties == configExt.properties);
    config.setProperty("1234", "1234");
    assertEquals("1234", configExt.getOptional("1234"));
}