title: Firestore query orderBy not working?
body: <p>FutureBuilder with a Firestore query on a field of Type timestamp comes back with no data in snapshot.  However, the same query without the orderBy works just fine.<br>
  What am  I missing ? Thanks for the help.</p>
  
  <pre><code>// Working code
  future: Firestore.instance.collection('messages').where('toid',isEqualTo: _emailID).getDocuments(),
  builder: (context, snapshot) ...
  
  // Not Working - returns to if(!snapshot.hasData)
  future: Firestore.instance.collection('messages').where('toid',isEqualTo: _emailID).orderBy('_timeStampUTC', descending: true).getDocuments(),
  builder: (context, snapshot) ...
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/J9tFq.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/J9tFq.jpg" alt="enter image description here"></a></p>