title: how to perform union clause query with hibernate criteria api
body: <pre><code>SELECT 
      supplier_id  FROM suppliers   UNION ALL 
  
  SELECT     supplier_id  FROM orders;
  </code></pre>
  
  <p>i just creating two criteria above "UNION ALL" clause of query and below "UNION ALL" clause of query.</p>
  
  <p>but my question is how i perform UNION ALL clause in criteria?
  Thanks in Advance.</p>