title: FB FQL query comment does not work
body: <p>I use <code>Facebook PHP SDK</code>  and  I have <strong>FQL</strong> query:</p>
  
  
  
  <pre class="lang-sql prettyprint-override"><code>SELECT fromid,
         text,
         id, time,
         username,
         xid,
         object_id
  FROM   comment
  WHERE  time &gt; $from
         AND time &lt; $to
         AND xid IN (
                 SELECT xid
                 FROM   comments_info
                 WHERE  app_id = $appid
                        AND updated_time &gt; $from
                        AND updated_time &lt; $to)
  ORDER BY time desc
  </code></pre>
  
  <p>It worked some time ago. Query returns null now.  </p>
  
  <p>I tried query</p>
  
  <pre class="lang-sql prettyprint-override"><code>SELECT count
  FROM   comments_info
  WHERE  app_id = $appid
  </code></pre>
  
  <p>And script return</p>
  
  <pre class="lang-sql prettyprint-override"><code>Fatal error: Uncaught Exception: 2: Service temporarily unavailable thrown in...
  </code></pre>