C4DOgSelectionHandler.php

  /**
   * Overrides \OgSelectionHandler::buildEntityFieldQuery
   */
  public function buildEntityFieldQuery($match = NULL, $match_operator = 'CONTAINS') {
    $query = parent::public function buildEntityFieldQuery($match, $match_operator);

    $field_mode = $this->instance['field_mode'];
    if ($field_mode == 'default') {
      $query->fieldCondition('', array(),'IN');
    }

    return $query
  }