function views_handler_filter_project_issue_fid_exist($op, $filter, $filterdata, &$query) {
  switch ($op) {
    case 'handler':
      $query->ensure_table('file_revisions');
      $query->ensure_table('comment_upload_files');
      if ($filter['value']) {
        $query->add_where('file_revisions.fid OR comment_upload_files.fid');
      }
      else {
        $query->add_where('ISNULL(file_revisions.fid) AND ISNULL(comment_upload_files.fid)');
      }
  }
}