CRM-13028

----------------------------------------
* CRM-13028: Adv logging: Refine triggers for tables with datestamps
  http://issues.civicrm.org/jira/browse/CRM-13028

CRM/Logging/Schema.php

@@ -46,6 +46,12 @@ class CRM_Logging_Schema {
     'logging/contribute/summary',
   );
 
+  //CRM-13028 / NYSS-6933 - table => array (cols) - to be excluded from the update statement 
+  private $exceptions = array(
+    'civicrm_job'   => array('last_run'),
+    'civicrm_group' => array('cache_date'),
+  ); 
+
   /**
    * Populate $this->tables and $this->logs with current db state.
    */
@@ -403,7 +409,7 @@ COLS;
       $cond = array( );
       foreach ($columns as $column) {
         // ignore modified_date changes
-        if ($column != 'modified_date') {
+        if ($column != 'modified_date' && !in_array($column, CRM_Utils_Array::value($table, $this->exceptions, array()))) {
           $cond[] = "IFNULL(OLD.$column,'') <> IFNULL(NEW.$column,'')";
         }
       }