title: Union tables with spring data jpa
body: <p>I have 2 tables one is <code>Users</code> and the other is <code>UserGroup</code> Having <code>ManyToMany</code> relationship , how can I union them into a single List with spring-data-JPA .</p>
  <p>**  don't want to use native Queries</p>
  <p><strong>UPDATE</strong>:</p>
  <p>the exact query that I want:</p>
  <p>SELECT email FROM user</p>
  <p>UNION</p>
  <p>SELECT title FROM group</p>