code: public OperationFuture<Database, CreateDatabaseMetadata> createDatabase(
        String databaseId, Iterable<String> statements) throws SpannerException {
      return dbClient.createDatabase(instanceId(), databaseId, statements);
    }
docs: Creates a new database in this instance.
  
  @param databaseId the id of the database which will be created. It must conform to the regular
  expression [a-z][a-z0-9_\-]*[a-z0-9] and be between 2 and 30 characters in length
  @param statements DDL statements to run while creating the database, for example {@code CREATE
  TABLE MyTable ( ... )}. This should not include {@code CREATE DATABASE} statement.