@Override
  public void createNamespace(String[] namespace, Map<String, String> metadata) {
    String database = namespaceToDatabase(namespace);
    if (metadata != null && !metadata.isEmpty()) {
      LOG.warn("doesn't support properties for database, all properties will be discard.");
    }
    unifiedCatalog.createDatabase(database);
  }
Unified catalog implement for spark engine.
amoro-format-mixed/amoro-mixed-spark/amoro-mixed-spark-3-common/src/main/java/org/apache/amoro/spark/SparkUnifiedCatalogBase.java