HYDRATE_SINGLE_SCALAR option always returns false

I notice that the fetchone with HYDRATE_SINGLE_SCALAR option always returns false as the return to the $collection object is a string type, this is returned by the hydrateResultSet with driver mode set to 6 (I assume this is for scalar values)

My code is a two table query with which returns a string of "10" (g.id in query below) and returns false because it is not a doctrine collection, I did check the doctrine examples and it seems to be the way its used. Not sure if its the doctrine version issue with symfony, my code or an actual bug

$q = Doctrine_Core::getTable('ClipGroup')
->createQuery('g')
->select('g.id')
->leftJoin('g.sfGuardUser u')
->Where('g.completed_at IS NULL')
->andWhere('g.expires_at > ?', date('Y-m-d H:i:s', time()))
->andWhere('u.id = ?', $userId);
return $q->fetchOne(array(), Doctrine_Core::HYDRATE_SINGLE_SCALAR);

I am using doctrine included in symfony 1.4.3, here is the comment on the Query.php file * @version $Revision: 6792 $,
public function fetchOne($params = array(), $hydrationMode = null)
{
$collection = $this->execute($params, $hydrationMode);

if (count($collection) === 0)

{ return false; }

if ($collection instanceof Doctrine_Collection)

{ return $collection->getFirst(); }

else if (is_array($collection))

{ return array_shift($collection); }

return false;
}

Hydrator.php - returns a string * @version $Revision: 3192 $

public function hydrateResultSet($stmt, $tableAliases)

{ $driver = $this->getHydratorDriver($this->_hydrationMode, $tableAliases); $result = $driver->hydrateResultSet($stmt); return $result; }