title: how to add a parameter to a part "from" into sql query in pentaho?
body: <p>I use postgreSQL/pentaho CDE. I need to transmit parameter as schema prefix in my query. I need to run this query: <code>select * from peredelkino_public.protocol</code></p>
  
  <p>I used custom parameter in Pentaho (named 'selector_par'), in properties named 'Javascript code' i wrote 'peredelkino_public.protocol'. 
  Then I changed sql query in component 'sql over sqlJndi' like this: <code>select * FROM (${selector_par})</code> 
  But this query doesn't work! I get message 'Error processing component'. How I can transmit schema prefix in my query?</p>