title: ERROR: function dmetaphone(unknown) does not exist
body: <p>I want similar function like soundex('anne')</p>
  
  <p>dmetaphone('anne')
  when I am trying to execute above query . It will give following error.</p>
  
  <blockquote>
    <p>ERROR:  function dmetaphone(unknown) does not exist</p>
  </blockquote>