title: Does FQL have a "NOT NULL" type operator?
body: <p>I'm messing around with FQL, and I have this query:</p>
  
  <pre><code>SELECT created_time, attachment, message FROM stream  WHERE source_id = me() LIMIT 1000
  </code></pre>
  
  <p>which returns 1000 results, most not relevant to me. I'd like to filter, for example, on MESSAGE IS NOT NULL. Is that (or something equivalent) possible with FQL?</p>