title: Redshift Query Ignoring LIMIT Clause
body: <p>While investigating duplicate event_id's, we noticed that Redshift seems to be ignoring the LIMIT clause on a simple query:</p>
  
  <pre><code>SELECT se_action
  FROM events
  WHERE event_id = 'e4a5ffbe-6a1d-47b7-ac10-6c57b2cd65ed'
  ORDER BY collector_tstamp DESC
  LIMIT 1;
  </code></pre>
  
  <p>When running this query, I receive over 800 results. Interestingly, if I remove the <code>ORDER BY</code> clause, I receive only one result as intended.</p>
  
  <p>How do I get this to properly output a single result, or does this sound like a bug with Redshift?</p>