WP_Privacy_Requests_Table::get_sortable_columns(): array

75	protected function get_sortable_columns() {76		/*77		 * The initial sorting is by 'Requested' (post_date) and descending.78		 * With initial sorting, the first click on 'Requested' should be ascending.79		 * With 'Requester' sorting active, the next click on 'Requested' should be descending.80		 */81		$desc_first = isset( $_GET['orderby'] );82 83		return array(84			'email'             => 'requester',85			'created_timestamp' => array( 'requested', $desc_first ),86		);87	}