Client.php

<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class Client
{
    /**
     * @ORM\Column(type="bigint") 
     * @ORM\Id @ORM\AutoGenerated
     */
    public $id;
  
    /** ... */
    public $clientStore;
}

ClientStore.php

<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class ClientStore
{
    /**
     * @ORM\Column(type="bigint") 
     * @ORM\Id @ORM\AutoGenerated
     */
    public $id;
  
    /** ... */
    public $location;
}

Location.php

<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class Location
{
    /**
     * @ORM\Column(type="bigint") 
     * @ORM\Id @ORM\AutoGenerated
     */
    public $id;
}

query.php

<?php

$qb = $entityManager->createQueryBuilder();

$qb
    ->select(['c', 'cs', 'l'])
    ->from('AppBundle\Entity\Client', 'c')
    ->innerJoin('c.clientStore', 'cs')
    ->innerJoin('cs.location', 'l')
    ->where('l.id = :location_id')
    ->addParameter('location_id', 123)
    
$result = $qb->getQuery()->getResult();