MenuTreeStorage::getExpanded

public MenuTreeStorage::getExpanded($menu_name, array $parents)

public function getExpanded($menu_name, array $parents) {
  // @todo Go back to tracking in state or some other way which menus have
  //   expanded links? https://www.drupal.org/node/2302187
  do {
    $query = $this->connection->select($this->table, $this->options);
    $query->fields($this->table, array('id'));
    $query->condition('menu_name', $menu_name);
    $query->condition('expanded', 1);
    $query->condition('has_children', 1);
    $query->condition('enabled', 1);
    $query->condition('parent', $parents, 'IN');
    $query->condition('id', $parents, 'NOT IN');
    $result = $this->safeExecuteSelect($query)->fetchAllKeyed(0, 0);
    $parents += $result;
  } while (!empty($result));
  return $parents;
}