@Override
  public void createNamespace(String[] namespace, Map<String, String> metadata) {
    if (namespace.length > 1) {
      throw new UnsupportedOperationException(
          "mixed-format does not support multi-level namespace.");
    }
    String database = namespace[0];
    catalog.createDatabase(database);
  }
Base class of mixed-format spark catalog.
amoro-format-mixed/amoro-mixed-spark/amoro-mixed-spark-3-common/src/main/java/org/apache/amoro/spark/mixed/MixedSparkCatalogBase.java