Doctrine Caching Results?

CategoryRepository.php

<?php

namespace Stanford\BerriesBundle\Entity\Berry;

use Doctrine\ORM\EntityRepository;

/**
 * CategoryRepository.
 *
 * This class was generated by the Doctrine ORM. Add your own custom
 * repository methods below.
 */
class CategoryRepository extends EntityRepository
{
    public function findUserActivities($user, $category = null)
    {
        $year = DateTime::now()->format('Y');

        $query = $this->createQueryBuilder('c')
            ->select('c, a, ua, u, s')
            ->leftJoin('c.activities', 'a')
            ->leftJoin('a.userActivities', 'ua')
            ->leftJoin('ua.user', 'u')
            ->leftJoin('ua.status', 's')
            ->leftJoin('a.parentActivity', 'p')
            ->where('ua.startedOn >= :startDate')
            ->andWhere('u.id = :userId')
            ->andWhere('c.active = true')
            ->andWhere('a.active = true')
            ->andWhere('p.id = 3')
            ->setParameter('userId', $user->getId())
            ->setParameter('startDate', "{$year}-01-01")
        ;

        if ($category) {
            $query
                ->andWhere('c.slug = :category')
                ->setParameter('category', $category)
            ;
        }

        $query->orderBy('ua.completedOn', 'ASC');

        return $query->getQuery()->getResult();
    }
}

DefaultController.php

<?php

namespace AppBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;

class DefaultController extends Controller
{
    /**
     * @Route("/", name="home")
     * @Method({"GET"})
     *
     * @Template("index.html.twig")
     */
    public function indexAction()
    {
        $user = $this->getDoctrine()->getRepository(User::class)->find(26236);
        $userActivities = $this->getDoctrine()->getRepository(Category::class)->findUserActivities($user);

        echo "User should be: {$user->getId()}<br/><br/>";

        foreach ($userActivities as $category) {
            foreach ($category->getActivities() as $activity) {
                foreach ($activity->getUserActivities() as $userActivity) {
                    echo "UA.id: {$userActivity->getId()} U.id: {$userActivity->getUser()->getId()} <br/>";
                }
            }
        }

        $user = $this->getDoctrine()->getRepository(User::class)->find(25845);
        $userActivities2 = $this->getDoctrine()->getRepository(Category::class)->findUserActivities($user);

        echo "<br/>User should be: {$user->getId()}<br/><br/>";

        foreach ($userActivities2 as $category) {
            foreach ($category->getActivities() as $activity) {
                foreach ($activity->getUserActivities() as $userActivity) {
                    echo "UA.id: {$userActivity->getId()} U.id: {$userActivity->getUser()->getId()} <br/>";
                }
            }
        }

        die;
    }
}

Results

User should be: 26236

UA.id: 836868 U.id: 26236
UA.id: 836784 U.id: 26236
UA.id: 836842 U.id: 26236
UA.id: 837069 U.id: 26236
UA.id: 860227 U.id: 26236
UA.id: 862047 U.id: 26236
UA.id: 867600 U.id: 26236
UA.id: 875389 U.id: 26236

User should be: 25845

UA.id: 860227 U.id: 26236
UA.id: 862047 U.id: 26236
UA.id: 867600 U.id: 26236
UA.id: 875389 U.id: 26236