Fix DDC-2208

lib/Doctrine/ORM/Query/Parser.php

@@ -1807,7 +1807,14 @@ class Parser
                 return new AST\Literal(AST\Literal::BOOLEAN, $this->lexer->token['value']);
 
             case ($lookahead === Lexer::T_INPUT_PARAMETER):
-                return $this->InputParameter();
+                switch (true) {
+                     case $this->isMathOperator($peek):
+                        // :param + u.value
+                        return $this->SimpleArithmeticExpression();
+
+                    default:
+                        return $this->InputParameter();
+                }
 
             case ($lookahead === Lexer::T_CASE):
             case ($lookahead === Lexer::T_COALESCE):

tests/Doctrine/Tests/ORM/Query/SelectSqlGenerationTest.php

@@ -1773,6 +1773,21 @@ class SelectSqlGenerationTest extends \Doctrine\Tests\OrmTestCase
             'SELECT q0_."group-id" AS groupid0, q0_."group-name" AS groupname1, q1_."group-id" AS groupid2, q1_."group-name" AS groupname3 FROM "quote-group" q0_ INNER JOIN "quote-group" q1_ ON q0_."parent-id" = q1_."group-id"'
         );
     }
+   /**
+    * @group DDC-2208
+    */
+    public function testCaseThenParameterArithmeticExpression()
+    {
+        $this->assertSqlGeneration(
+            'SELECT SUM(CASE WHEN e.startDate <= :date THEN e.startDate - :date WHEN e.startDate >= :date THEN :date - e.startDate ELSE 0 END) FROM Doctrine\Tests\Models\Company\CompanyEmployee e',
+            'SELECT SUM(CASE WHEN c0_.startDate <= ? THEN c0_.startDate - ? WHEN c0_.startDate >= ? THEN ? - c0_.startDate ELSE 0 END) AS sclr0 FROM company_employees c0_ INNER JOIN company_persons c1_ ON c0_.id = c1_.id'
+        );
+
+        $this->assertSqlGeneration(
+            'SELECT SUM(CASE WHEN e.startDate <= :date THEN e.startDate - :date WHEN e.startDate >= :date THEN :date - e.startDate ELSE e.startDate + 0 END) FROM Doctrine\Tests\Models\Company\CompanyEmployee e',
+            'SELECT SUM(CASE WHEN c0_.startDate <= ? THEN c0_.startDate - ? WHEN c0_.startDate >= ? THEN ? - c0_.startDate ELSE c0_.startDate + 0 END) AS sclr0 FROM company_employees c0_ INNER JOIN company_persons c1_ ON c0_.id = c1_.id'
+        );
+    }
 }
 
 class MyAbsFunction extends \Doctrine\ORM\Query\AST\Functions\FunctionNode