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diff --git a/vendor/doctrine/orm/lib/Doctrine/ORM/Query/AST/NullComparisonExpression.php b/vendor/doctrine/orm/lib/Doctrine/ORM/Query/AST/NullComparisonExpression.php
new file mode 100644
index 0000000..d0fb8bf
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+++ b/vendor/doctrine/orm/lib/Doctrine/ORM/Query/AST/NullComparisonExpression.php
@@ -0,0 +1,47 @@
+<?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;
+
+/**
+ * NullComparisonExpression ::= (SingleValuedPathExpression | InputParameter) "IS" ["NOT"] "NULL"
+ *
+ * 
+ * @link    www.doctrine-project.org
+ * @since   2.0
+ * @author  Guilherme Blanco <guilhermeblanco@hotmail.com>
+ * @author  Jonathan Wage <jonwage@gmail.com>
+ * @author  Roman Borschel <roman@code-factory.org>
+ */
+class NullComparisonExpression extends Node
+{
+    public $not;
+    public $expression;
+
+    public function __construct($expression)
+    {
+        $this->expression = $expression;
+    }
+
+    public function dispatch($sqlWalker)
+    {
+        return $sqlWalker->walkNullComparisonExpression($this);
+    }
+}
+