$this->addWhereFld( 'rev_page', $pages );
$this->addWhere( 'rev_user = 0' );
$this->addWhere( $db->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' );
$this->addOption( 'GROUP BY', 'rev_page' );
$res = $this->select( __METHOD__ );
foreach ( $res as $row ) {
$this->addWhereFld( 'rev_page', $pages );
$this->addWhere( 'rev_user = 0' );
$this->addWhere( $db->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' );
$this->addOption( 'GROUP BY', 'rev_page' );
$res = $this->select( __METHOD__ );
foreach ( $res as $row ) {