title: OrderBy in documentdb linq query in IDocumentQuery
body: <p>I try to use <code>OrderBy</code> in <code>IDocumentQuery</code> query under <code>documentdb</code> in c#.
  I try to retrieve list of courses order by distance from my place so:</p>
  
  <pre><code>var userQuery = _client
      .CreateDocumentQuery&lt;Course&gt;(_uriCourseCollection, options)
      .Where(x =&gt; x.CourseName.ToLower().Contains(text))
      .OrderBy(x =&gt;x.GeoLocation.Location.Distance(myPoint))
      .AsDocumentQuery();
  </code></pre>
  
  <p>I received the following error message : </p>
  
  <blockquote>
    <p>"Unsupported ORDER BY clause. ORDER BY item expression could not be
    mapped to a document path"</p>
  </blockquote>
  
  <p>Someone may have solution ? , or a workaround to solved the query in efficient way ?</p>