$tableColumns['emp_id'] = array(
			'display_text' => 'Participant', 
			'perms' => 'ADEFTAQSVX',
			'join' => array(
               'table' => 'sap_users',
               'column' => 'ecd',
			   'display_mask' => "concat(LPAD(sap_users.ecd, 5, '0'),' - ',sap_users.name_full)",
               'type' => 'left'
			),