Defines default values for options.
Overrides RelationshipPluginBase::defineOptions
protected function defineOptions() {
$options = parent::defineOptions();
$options['subquery_sort'] = array(
'default' => NULL,
);
// Descending more useful.
$options['subquery_order'] = array(
'default' => 'DESC',
);
$options['subquery_regenerate'] = array(
'default' => FALSE,
'bool' => TRUE,
);
$options['subquery_view'] = array(
'default' => FALSE,
);
$options['subquery_namespace'] = array(
'default' => FALSE,
);
return $options;
}