fix bit operator expressions in DB2

lib/Doctrine/DBAL/Platforms/DB2Platform.php

@@ -127,6 +127,22 @@ class DB2Platform extends AbstractPlatform
         return $autoinc;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function getBitAndComparisonExpression($value1, $value2)
+    {
+        return 'BITAND(' . $value1 . ', ' . $value2 . ')';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getBitOrComparisonExpression($value1, $value2)
+    {
+        return 'BITOR(' . $value1 . ', ' . $value2 . ')';
+    }
+
     /**
      * {@inheritdoc}
      */