title: Why does the wm_concat not work here?
body: <p>I have this query :</p>
  
  <pre><code>(SELECT OBJECT_ID from cr_object_group_entries_vw where object_group_id IN
      (SELECT ITEM FROM TABLE(CR_FN_SPLIT_STRING('28,56',','))))
  </code></pre>
  
  <p>that returns :</p>
  
  <p><img src="https://i.stack.imgur.com/oNq3v.png" alt="enter image description here"></p>
  
  <p>But when I do :</p>
  
  <pre><code>SELECT wm_concat(object_id) FROM
      (SELECT OBJECT_ID from cr_object_group_entries_vw where object_group_id IN
          (SELECT ITEM FROM TABLE(CR_FN_SPLIT_STRING('28,56',','))))
  </code></pre>
  
  <p>I get a blank result... what am I doing wrong?</p>