title: List grants and privileges for a materialized view in PostgreSQL
body: <p>I need to determine what privileges are currently granted for some materialized views in my database.</p>
  
  <p>The query to do this for a table or standard view is pretty straight forward:</p>
  
  <pre><code>SELECT grantee, string_agg(privilege_type, ', ') AS privileges
  FROM information_schema.table_privileges
  WHERE table_schema = 'some_schema' AND table_name = 'some_table'
  GROUP by grantee;
  </code></pre>
  
  <p>That said, there doesn't seem to be an analogous table for materialized views. Where does PostgreSQL store this information?</p>