@After
  public void after() {
    sql("DROP TABLE IF EXISTS " + catalogName + "." + DB + "." + TABLE);
    sql("DROP DATABASE IF EXISTS " + catalogName + "." + DB);
    Assert.assertTrue(CollectionUtil.isNullOrEmpty(getMixedFormatCatalog().listDatabases()));
    sql("USE CATALOG default_catalog");
    sql("DROP CATALOG " + catalogName);
  }
Test cases for mixed catalog factories, including:
CatalogFactoryOptions.MIXED_ICEBERG_IDENTIFIER, CatalogFactoryOptions.MIXED_HIVE_IDENTIFIER,
CatalogFactoryOptions.LEGACY_MIXED_IDENTIFIER
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/test/java/org/apache/amoro/flink/catalog/TestMixedCatalog.java