Verify UnitOfWork::HINT_DEFEREAGERLOAD exists and is true

lib/Doctrine/ORM/UnitOfWork.php

@@ -2976,7 +2976,9 @@ public function createEntity($className, array $data, &$hints = [])
                                     break;
 
                                 // Deferred eager load only works for single identifier classes
-                                case isset($hints[self::HINT_DEFEREAGERLOAD]) && ! $targetClass->isIdentifierComposite:
+                                case isset($hints[self::HINT_DEFEREAGERLOAD]) &&
+                                    $hints[self::HINT_DEFEREAGERLOAD] &&
+                                    ! $targetClass->isIdentifierComposite:
                                     // TODO: Is there a faster approach?
                                     $this->eagerLoadingEntities[$targetClass->rootEntityName][$relatedIdHash] = current($normalizedAssociatedId);
 

tests/Doctrine/Tests/ORM/Functional/Ticket/GH10808Test.php

@@ -0,0 +1,107 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\ORM\Mapping\Column;
+use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\GeneratedValue;
+use Doctrine\ORM\Mapping\Id;
+use Doctrine\ORM\Mapping\JoinColumn;
+use Doctrine\ORM\Mapping\OneToOne;
+use Doctrine\ORM\Mapping\Table;
+use Doctrine\ORM\UnitOfWork;
+use Doctrine\Tests\OrmFunctionalTestCase;
+
+use function get_class;
+
+/** @group GH10808 */
+class GH10808Test extends OrmFunctionalTestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->createSchemaForModels(
+            GH10808Appointment::class,
+            GH10808AppointmentChild::class
+        );
+    }
+
+    public function testDQLDeferredEagerLoad(): void
+    {
+        $appointment = new GH10808Appointment();
+
+        $this->_em->persist($appointment);
+        $this->_em->flush();
+        $this->_em->clear();
+
+        $query = $this->_em->createQuery(
+            'SELECT appointment from Doctrine\Tests\ORM\Functional\Ticket\GH10808Appointment appointment
+               JOIN appointment.child appointment_child
+               WITH appointment_child.id = 1'
+        );
+
+        // By default, UnitOfWork::HINT_DEFEREAGERLOAD is set to 'true'
+        $deferredLoadResult = $query->getSingleResult();
+
+        // Clear the EM to prevent the recovery of the loaded instance, which would otherwise result in a proxy.
+        $this->_em->clear();
+
+        $eagerLoadResult = $query->setHint(UnitOfWork::HINT_DEFEREAGERLOAD, false)->getSingleResult();
+
+        self::assertNotEquals(
+            GH10808AppointmentChild::class,
+            get_class($deferredLoadResult->child),
+            '$deferredLoadResult->child should be a proxy'
+        );
+        self::assertEquals(
+            GH10808AppointmentChild::class,
+            get_class($eagerLoadResult->child),
+            '$eagerLoadResult->child should not be a proxy'
+        );
+    }
+}
+
+/**
+ * @Entity
+ * @Table(name="gh10808_appointment")
+ */
+class GH10808Appointment
+{
+    /**
+     * @var int
+     * @Id
+     * @Column(type="integer")
+     * @GeneratedValue
+     */
+    public $id;
+
+    /**
+     * @var GH10808AppointmentChild
+     * @OneToOne(targetEntity="GH10808AppointmentChild", cascade={"persist", "remove"}, fetch="EAGER")
+     * @JoinColumn(name="child_id", referencedColumnName="id")
+     */
+    public $child;
+
+    public function __construct()
+    {
+        $this->child = new GH10808AppointmentChild();
+    }
+}
+
+/**
+ * @Entity
+ * @Table(name="gh10808_appointment_child")
+ */
+class GH10808AppointmentChild
+{
+    /**
+     * @var int
+     * @Id
+     * @Column(type="integer")
+     * @GeneratedValue
+     */
+    private $id;
+}