11
Okay... Here's a sample of some code that does the table join as expected.
$object_id = 3; // whatever value for id you want to count
$class_handler =& xoops_getmodulehandler('<classname>', $xoopsModule->getVar('dirname'));
$class_handler->table_link = $xoopsDB->prefix('<linked_table_name>');
$class_handler->field_link = '<linked_table_column_name>';
$class_handler->field_object = '<this_class_object_column_name>';
$criteria = new Criteria('o.<column_name_from_object>', $object_id, '=');
$result = $class_handler->getCountByLink($criteria);
Hope this helps... Thanks BÁNÐÍT-X for pointing me in the right direction.