[2.0] Add missing Query::HINT_CUSTOM_OUTPUT_WALKER - it wasn't possible to change the output walker before without extending and overwriting one large method in Query

lib/Doctrine/ORM/Query.php

@@ -73,8 +73,23 @@ final class Query extends AbstractQuery
      * @var string
      */
     const HINT_INCLUDE_META_COLUMNS = 'doctrine.includeMetaColumns';
-    
+
+    /**
+     * An array of class names that implement Doctrine\ORM\Query\TreeWalker and
+     * are iterated and executed after the DQL has been parsed into an AST.
+     *
+     * @var string
+     */
     const HINT_CUSTOM_TREE_WALKERS = 'doctrine.customTreeWalkers';
+
+    /**
+     * A string with a class name that implements Doctrine\ORM\Query\TreeWalker
+     * and is used for generating the target SQL from any DQL AST tree.
+     *
+     * @var string
+     */
+    const HINT_CUSTOM_OUTPUT_WALKER = 'doctrine.customOutputWalker';
+
     //const HINT_READ_ONLY = 'doctrine.readOnly';
 
     /**

lib/Doctrine/ORM/Query/Parser.php

@@ -292,6 +292,10 @@ class Parser
             $this->_customTreeWalkers = $customWalkers;
         }
 
+        if ($customOutputWalker = $this->_query->getHint(Query::HINT_CUSTOM_OUTPUT_WALKER)) {
+            $this->_customOutputWalker = $customOutputWalker;
+        }
+
         // Run any custom tree walkers over the AST
         if ($this->_customTreeWalkers) {
             $treeWalkerChain = new TreeWalkerChain($this->_query, $this->_parserResult, $this->_queryComponents);