$this->_from.=" INNER JOIN civicrm_activity_contact civicrm_activity_assignment ON ( {$this->_aliases['civicrm_activity']}.id = civicrm_activity_assignment.activity_id AND civicrm_activity_assignment.record_type = 'Assignee' )\n";
//get the address table.
$this->_from.=" LEFT JOIN civicrm_address {$this->_aliases['civicrm_address']} ON {$this->_aliases['civicrm_contact']}.id = {$this->_aliases['civicrm_address']}.contact_id AND {$this->_aliases['civicrm_address']}.is_primary = 1\n";