private CreateNamespaceResponse createNamespace(Object body) {
    if (asNamespaceCatalog != null) {
      CreateNamespaceRequest request = castRequest(CreateNamespaceRequest.class, body);
      return castResponse(
              CreateNamespaceResponse.class, CatalogHandlers.createNamespace(asNamespaceCatalog, request));
    }
    throw new NamespaceNotSupported(catalog.toString());
  }
@param apis an optional list of known api call names
@return the list of metric names for the HMSCatalog class
standalone-metastore/metastore-rest-catalog/src/main/java/org/apache/iceberg/rest/HMSCatalogAdapter.java