title: Concatenate fields in grails GORM search criteria
body: <p>Is it possible to rewrite the following hibernate query using grails criteria builder?</p>
  
  <pre><code>select p from Person as p 
  where lower(p.firstname) + ' ' + lower(p.lastname) like '%john doe%'
  </code></pre>
  
  <p>Thanks, 
  Valdemar</p>