title: Symfony2 Doctrine Qb STR_TO_DATE Unknown Function
body: <p>When i try to execute STR_TO_DATE mysql function with Doctrine query builder, symfony2 throws an exception like:</p>
  
  <blockquote>
    <p>Error: Expected known function, got 'STR_TO_DATE'</p>
  </blockquote>
  
  <p>My code is :</p>
  
  <pre><code>STR_TO_DATE(m.metaValue, '%m/%d/%Y') BETWEEN '".$filter["sDate"]["month"]."/01/".$filter["sDate"]["year"]."' AND '".$filter["eDate"]["month"]."/01/".$filter["eDate"]["year"]."'"
  </code></pre>
  
  <p>How can i get it work?</p>