title: Redshift UDF compatibility issue
body: <p>I am trying to install a function mentioned on this page...</p>
  
  <p><a href="https://en.wikibooks.org/wiki/Algorithm_Implementation/Checksums/Verhoeff_Algorithm#plpgsql" rel="nofollow noreferrer">https://en.wikibooks.org/wiki/Algorithm_Implementation/Checksums/Verhoeff_Algorithm#plpgsql</a></p>
  
  <p>It is working on all platforms except Redshift. I get an error...</p>
  
  <pre><code>Error in query: ERROR: Create Function is not supported for language plpgsql.
  </code></pre>
  
  <p>How do I make this function compatible with redshift?</p>