count query fails when placeholders in select

[greg606]

Given the query

$qb->select("c, u, p, a, pd, ad, GEO_DISTANCE_BY_POSTAL_CODE('GB', :postcode, 'GB', ad.outerPostcode) AS distance");

the count query fails as it strips the select clause.

quick fix for it is like this:
from Ali/DatatableBundle/Util/Factory/Query/DoctrineBuilder.php:148

    /**
     * get total records
     * 
     * @return integer 
     */
    public function getTotalRecords()
    {
        $qb = clone $this->queryBuilder;
        $this->_addSearch($qb);
        $qb->resetDQLPart('orderBy');

        $gb = $qb->getDQLPart('groupBy');
        if (empty($gb) || !in_array($this->fields['_identifier_'], $gb))
        {
            $qb->select(" count({$this->fields['_identifier_']}), (:postcode) distance ");

            return $qb->getQuery()->getSingleResult()[1];
        }
        else
        {
            $qb->resetDQLPart('groupBy');
            $qb->select(" count(distinct {$this->fields['_identifier_']}) ");
            return $qb->getQuery()->getSingleScalarResult();
        }
    }

Of course it will break other datatables.
I think it should be catered for in more general way.
Other possible soloution - remove parameters bound.