function getSubRelData()
{
if (!isset($this->subRel) || !isset($this->subRelJoinColumns)) {
// return empty result.
return array();
}
$query = new SearchQuery($this->dbConn, $this->relation);
$query->setSubRel($this->subRel)->setSubRelJoinColumns($this->subRelJoinColumns);
$sql = $query->getSubRelQuery();
$this->logString .= 'subrel:' . $sql;
return $this->dbConn->Execute($sql)->fields;
}
