title: Django Queryset: column reference is ambiguous with extra queryset
body: <p>I have the next queryset:</p>
  
  <pre><code>Article.objects.filter(finished=True, updated_at__range=[start, end]).extra(
      select={'hour': 'extract(hour from updated_at)'}).values('hour').annotate(categorized=Count('id'))
  </code></pre>
  
  <p>And I get the error :</p>
  
  <blockquote>
    <p>"ProgrammingError: column reference "updated_at" is ambiguous
    LINE 1: SELECT (extract(hour from updated_at)) AS "hour", COUNT("art..."</p>
  </blockquote>
  
  <p>How should I go about this?</p>
  
  <p>Edit:
  The queryset works without filtering by date "updated_at__range=[start, end]" but I need that filter.</p>