modules/aggregator/views_handler_argument_aggregator_iid.inc

<?php

class views_handler_argument_aggregator_iid extends views_handler_argument_numeric {
  function title_query() {
    $titles = array();
    $placeholders = implode(', ', array_fill(0, sizeof($this->value), '%d'));

    $result = db_select('aggregator_item')
      ->condition('iid', $this->value, 'IN')
      ->fields(array('title'))
      ->execute();
    foreach ($result as $term) {
      $titles[] = check_plain($term->title);
    }
    return $titles;
  }
}