title: Equivalent of extend method of collection in postgresql
body: <p>I use user defined type like 
  create type type_name table of (varchar2(32000));</p>
  
  <p>In oracle and to extend the size of that type i used extend method of collection 
  type_name.extend();</p>
  
  <p>but now i am converting the oracle database to postgresql and i m using user defined type and i want to extend the size of that type so which method i used to extend the size of that type in postgresql.</p>
  
  <p>I try various method like unnest and append but they are not working please tell me alternative of extend method...</p>