[DDC-1619] Add QueryBuilder#distinct

lib/Doctrine/ORM/QueryBuilder.php

@@ -50,6 +50,7 @@ class QueryBuilder
      * @var array The array of DQL parts collected.
      */
     private $_dqlParts = array(
+        'distinct' => false,
         'select'  => array(),
         'from'    => array(),
         'join'    => array(),
@@ -346,7 +347,7 @@ class QueryBuilder
      *         ->setParameters(array(
      *             'user_id1' => 1,
      *             'user_id2' => 2
-     *         ));
+              ));
      * </code>
      *
      * @param array $params The query parameters to set.
@@ -503,6 +504,25 @@ class QueryBuilder
         return $this->add('select', new Expr\Select($selects), false);
     }
 
+    /**
+     * Add a DISTINCT flag to this query.
+     *
+     * <code>
+     *     $qb = $em->createQueryBuilder()
+     *         ->select('u')
+     *         ->distinct()
+     *         ->from('User', 'u');
+     * </code>
+     *
+     * @param bool
+     * @return QueryBuilder
+     */
+    public function distinct($flag = true)
+    {
+        $this->_dqlParts['distinct'] = (bool) $flag;
+        return $this;
+    }
+
     /**
      * Adds an item that is to be returned in the query result.
      *
@@ -981,7 +1001,9 @@ class QueryBuilder
 
     private function _getDQLForSelect()
     {
-        $dql = 'SELECT' . $this->_getReducedDQLQueryPart('select', array('pre' => ' ', 'separator' => ', '));
+        $dql = 'SELECT'
+              . ($this->_dqlParts['distinct']===true ? ' DISTINCT' : '')
+              . $this->_getReducedDQLQueryPart('select', array('pre' => ' ', 'separator' => ', '));
 
         $fromParts   = $this->getDQLPart('from');
         $joinParts   = $this->getDQLPart('join');
@@ -1090,4 +1112,4 @@ class QueryBuilder
             }
         }
     }
-}
+}

tests/Doctrine/Tests/ORM/QueryBuilderTest.php

@@ -732,4 +732,17 @@ class QueryBuilderTest extends \Doctrine\Tests\OrmTestCase
 
         $this->assertEquals('SELECT u FROM Doctrine\Tests\Models\CMS\CmsUser u', $qb->getDQL());
     }
-}
+
+    /**
+     * @group DDC-1619
+     */
+    public function testAddDistinct()
+    {
+        $qb = $this->_em->createQueryBuilder()
+            ->select('u')
+            ->distinct()
+            ->from('Doctrine\Tests\Models\CMS\CmsUser', 'u');
+
+        $this->assertEquals('SELECT DISTINCT u FROM Doctrine\Tests\Models\CMS\CmsUser u', $qb->getDQL());
+    }
+}