title: pg_dump with user dont superadmin and large objects
body: <p>I have started a long career for export databases with users who are not superadmins. But I found the problem that in the new versions of postgresql only superadmins can access large objects.</p>
  
  <pre><code>ERROR: permission denied for large object 5141
  </code></pre>
  
  <p>There is no way to do this:</p>
  
  <pre><code>GRANT SELECT ON ALL LARGE OBJECTS TO role_name;
  </code></pre>
  
  <p>I thought making a triger and when a large object was created (table pg_catalog.pg_largeobject), give my user permissions. But triggers on system catalog are not allowed.</p>
  
  <p>I have come to the conclusion that you can not export if you are not superuser. Is this right?</p>