exports: add condition with distinct alias on join clauses

src/Bundle/ChillPersonBundle/Tests/Export/Filter/AccompanyingCourseFilters/ReferrerFilterTest.php

@@ -79,8 +79,8 @@ final class ReferrerFilterTest extends AbstractFilterTest
                 ->select('acpw.id'),
             $em->createQueryBuilder()
                 ->from('ChillPersonBundle:AccompanyingPeriod\AccompanyingPeriodWork', 'acpw')
-                ->join('acpw.referrers', 'r')
-                ->select('r.id'),
+                ->join('acpw.referrers', 'acpwuser')
+                ->select('acpwuser.id'),
         ];
     }
 }