GetUserDefinedFields from all contact

My recommendation would be to use an archive provider query, it's faster.

#setLanguageLevel 4;

NSArchiveRestrictionInfo[] restrictions;
NSArchiveRestrictionInfo res1;
res1.SetName("contactUdef/SuperOffice:43");
res1.SetOperator("=");
res1.SetValues(String("44444").split(","));
restrictions.pushBack(res1);

NSArchiveOrderByInfo[] order;
 
String[] entities = String("contact").split(",");

Integer pageSize = 250;

NSArchiveAgent archiveAgent;
NSArchiveListItem[] rows = archiveAgent.GetArchiveListByColumns("SimpleContact", String("contactId,name,contactUdef/SuperOffice:43").split(","), order, restrictions, entities, 0, pageSize);

foreach (NSArchiveListItem row in rows) {
  Map rowData = row.GetColumnData();
  String contactId = rowData.get("contactId");
  String contactName = rowData.get("name");
  String contactUdef = rowData.get("contactUdef/SuperOffice:43");
  
  printLine(contactId + ": " + contactName + "=> " + contactUdef );
}

Hope this helps!