public function GetInstance(\Google\Cloud\Spanner\Admin\Instance\V1\GetInstanceRequest $argument,
      $metadata = [], $options = []) {
        return $this->_simpleRequest('/google.spanner.admin.instance.v1.InstanceAdmin/GetInstance',
        $argument,
        ['\Google\Cloud\Spanner\Admin\Instance\V1\Instance', 'decode'],
        $metadata, $options);
    }