Overrides \Drupal\views\Plugin\views\field\FieldPluginBase::defineOptions().
Overrides FieldPluginBase::defineOptions
public function defineOptions() {
$options = parent::defineOptions();
$options['fields'] = array(
'default' => array(),
);
$options['destination'] = array(
'default' => TRUE,
'bool' => TRUE,
);
return $options;
}