Fixed wrong property name

lib/Doctrine/ORM/Query/ResultSetMappingBuilder.php

@@ -438,8 +438,8 @@ public function generateSelectClause($tableAliases = array())
                 $sql  .= $class->fieldMappings[$this->fieldMappings[$columnName]]['columnName'];
             } else if (isset($this->metaMappings[$columnName])) {
                 $sql .= $this->metaMappings[$columnName];
-            } else if (isset($this->discriminatorColumn[$columnName])) {
-                $sql .= $this->discriminatorColumn[$columnName];
+            } else if (isset($this->discriminatorColumns[$dqlAlias])) {
+                $sql .= $this->discriminatorColumns[$dqlAlias];
             }
 
             $sql .= " AS " . $columnName;

tests/Doctrine/Tests/Models/DDC3899/DDC3899Contract.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Doctrine\Tests\Models\DDC3899;
+
+/**
+ * @Entity
+ * @Table(name="dc3899_contracts")
+ * @InheritanceType("SINGLE_TABLE")
+ * @DiscriminatorColumn(name="discr", type="string")
+ * @DiscriminatorMap({
+ *     "fix"       = "DDC3899FixContract",
+ *     "flexible"  = "DDC3899FlexContract"
+ * })
+ */
+abstract class DDC3899Contract
+{
+    /** @Id @Column(type="integer") */
+    public $id;
+
+    /** @Column(type="boolean") */
+    public $completed = false;
+
+    /** @ManyToOne(targetEntity="DDC3899User", inversedBy="contract") */
+    public $user;
+}

tests/Doctrine/Tests/Models/DDC3899/DDC3899FixContract.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Doctrine\Tests\Models\DDC3899;
+
+/**
+ * @Entity
+ */
+class DDC3899FixContract extends DDC3899Contract
+{
+    /** @column(type="integer") */
+    public $fixPrice = 0;
+}

tests/Doctrine/Tests/Models/DDC3899/DDC3899FlexContract.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Doctrine\Tests\Models\DDC3899;
+
+/**
+ * @Entity
+ */
+class DDC3899FlexContract extends DDC3899Contract
+{
+    /** @column(type="integer") */
+    public $hoursWorked = 0;
+
+    /** @column(type="integer") */
+    public $pricePerHour = 0;
+}

tests/Doctrine/Tests/Models/DDC3899/DDC3899User.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Doctrine\Tests\Models\DDC3899;
+
+/**
+ * @Entity
+ * @Table(name="dc3899_users")
+ */
+class DDC3899User
+{
+    /** @Id @Column(type="integer") */
+    public $id;
+
+    /** @OneToMany(targetEntity="DDC3899Contract", mappedBy="user") */
+    public $contracts;
+}

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

@@ -791,4 +791,20 @@ public function testGenerateSelectClauseToString()
 
         $this->assertSQLEquals('u.id AS id0, u.status AS status1, u.username AS username2, u.name AS name3, u.email_id AS email_id4', (string)$rsm);
     }
+
+    /**
+     * @group DDC-3899
+     */
+    public function testGenerateSelectClauseWithDiscriminatorColumn()
+    {
+        $rsm = new ResultSetMappingBuilder($this->_em, ResultSetMappingBuilder::COLUMN_RENAMING_INCREMENT);
+        $rsm->addEntityResult('Doctrine\Tests\Models\DDC3899\DDC3899User', 'u');
+        $rsm->addJoinedEntityResult('Doctrine\Tests\Models\DDC3899\DDC3899FixContract', 'c', 'u', 'contracts');
+        $rsm->addFieldResult('u', $this->platform->getSQLResultCasing('id'), 'id');
+        $rsm->setDiscriminatorColumn('c', $this->platform->getSQLResultCasing('discr'));
+
+        $selectClause = $rsm->generateSelectClause(array('u' => 'u1', 'c' => 'c1'));
+
+        $this->assertSQLEquals('u1.id as id, c1.discr as discr', $selectClause);
+    }
 }