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diff --git a/vendor/doctrine/orm/lib/Doctrine/ORM/Query/AST/Functions/IdentityFunction.php b/vendor/doctrine/orm/lib/Doctrine/ORM/Query/AST/Functions/IdentityFunction.php
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+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\ORM\Query\AST\Functions;
+
+use Doctrine\ORM\Query\Lexer;
+
+/**
+ * "IDENTITY" "(" SingleValuedAssociationPathExpression ")"
+ *
+ * 
+ * @link    www.doctrine-project.org
+ * @since   2.2
+ * @author  Guilherme Blanco <guilhermeblanco@hotmail.com>
+ * @author  Benjamin Eberlei <kontakt@beberlei.de>
+ */
+class IdentityFunction extends FunctionNode
+{
+    public $pathExpression;
+
+    /**
+     * @override
+     */
+    public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker)
+    {
+        $dqlAlias   = $this->pathExpression->identificationVariable;
+        $assocField = $this->pathExpression->field;
+
+        $qComp = $sqlWalker->getQueryComponent($dqlAlias);
+        $class = $qComp['metadata'];
+        $assoc = $class->associationMappings[$assocField];
+
+        $tableAlias = $sqlWalker->getSQLTableAlias($class->getTableName(), $dqlAlias);
+
+        return $tableAlias . '.' . reset($assoc['targetToSourceKeyColumns']);;
+    }
+
+    /**
+     * @override
+     */
+    public function parse(\Doctrine\ORM\Query\Parser $parser)
+    {
+        $parser->match(Lexer::T_IDENTIFIER);
+        $parser->match(Lexer::T_OPEN_PARENTHESIS);
+
+        $this->pathExpression = $parser->SingleValuedAssociationPathExpression();
+
+        $parser->match(Lexer::T_CLOSE_PARENTHESIS);
+    }
+}
+