adds a test for postgres that uses a HIDDEN result variable for ordering based on arithmetic expression

Author: sgehrig

tests/Doctrine/Tests/ORM/Functional/GH8011Test.php

@@ -7,7 +7,6 @@
 use Doctrine\DBAL\Platforms\PostgreSQLPlatform;
 use Doctrine\Tests\Models\Company\CompanyEmployee;
 use Doctrine\Tests\OrmFunctionalTestCase;
-
 use function count;
 
 /**
@@ -204,6 +203,20 @@ public function testOrderWithArithmeticExpressionWithSingleValuedPathExpressionA
         $this->assertEquals('Benjamin E.', $result[1]->getName());
     }
 
+    public function testOrderWithArithmeticExpressionWithLiteralAndResultVariableUsingHiddenResultVariable(): void
+    {
+        $dql = 'SELECT p, p.salary AS HIDDEN s, 1 + s AS HIDDEN _order ' .
+               'FROM Doctrine\Tests\Models\Company\CompanyEmployee p ' .
+               'ORDER BY _order DESC';
+
+        /** @var CompanyEmployee[] $result */
+        $result = $this->_em->createQuery($dql)->getResult();
+
+        $this->assertEquals(2, count($result));
+        $this->assertEquals('Guilherme B.', $result[0]->getName());
+        $this->assertEquals('Benjamin E.', $result[1]->getName());
+    }
+
     public function generateFixture(): void
     {
         $person1 = new CompanyEmployee();