docs: @BetaApi(
        "The surface for long-running operations is not stable yet and may change in the future.")
    public final OperationFuture<Empty, UpdateDatabaseDdlMetadata> updateDatabaseDdlAsync(
        DatabaseName database, List<String> statements) {
  
      UpdateDatabaseDdlRequest request =
          UpdateDatabaseDdlRequest.newBuilder()
              .setDatabase(database == null ? null : database.toString())
              .addAllStatements(statements)
              .build();
      return updateDatabaseDdlAsync(request);
    }