title: MD5 function returns empty result
body: <p>I am trying to return an MD5 encoded string of a value from my database, but it just returns a blank result (not null, just blank).
  I have tried just running this query and get the same result:</p>
  
  <pre><code>SELECT MD5('test');
  </code></pre>
  
  <p>I have tried restarting the MySQL server, MySQL Workbench, etc. But get the same result.
  If I try running the same command on a different database/server, it returns the hash string just fine.</p>
  
  <p>What am I doing wrong? Is there a setting I disabled on accident?</p>