protected function query_filters( $query_vars ) {
		global $wp_post_statuses;

		// Filter the orders by the posted customer.
		if ( ! empty( $_GET['_customer_user'] ) ) { // WPCS: input var ok.
			// @codingStandardsIgnoreStart.
			$query_vars['meta_query'] = array(
				array(
					'key'     => '_customer_user',
					'value'   => (int) $_GET['_customer_user'], // WPCS: input var ok, sanitization ok.
					'compare' => '=',
				),
			);
			// @codingStandardsIgnoreEnd
		}

		// Sorting.
		if ( isset( $query_vars['orderby'] ) ) {
			if ( 'order_total' === $query_vars['orderby'] ) {
				// @codingStandardsIgnoreStart
				$query_vars = array_merge( $query_vars, array(
					'meta_key'  => '_order_total',
					'orderby'   => 'meta_value_num',
				) );
				// @codingStandardsIgnoreEnd
			}
		}

		// Status.
		if ( empty( $query_vars['post_status'] ) ) {
			$post_statuses = wc_get_order_statuses();

			foreach ( $post_statuses as $status => $value ) {
				if ( isset( $wp_post_statuses[ $status ] ) && false === $wp_post_statuses[ $status ]->show_in_admin_all_list ) {
					unset( $post_statuses[ $status ] );
				}
			}

			$query_vars['post_status'] = array_keys( $post_statuses );
		}
		return $query_vars;
	}