Wordpress: Order comments by custom_meta

orderby_coments_meta.php

<?php
    #order comments by custom_meta
    add_filter('comments_clauses','comments_order_by_meta');
    function comments_order_by_meta($clauses){
        global $wpdb;
        #Join comments meta
        $clauses['join'] = "
            LEFT JOIN $wpdb->commentmeta
            ON ( $wpdb->comments.comment_ID = $wpdb->commentmeta.comment_id ) AND ($wpdb->commentmeta.meta_key = 'kash_reviews_rating')
        ";
        #Order By
        $current_order = get_option('default_comments_page') == 'newest' ? 'DESC' : 'ASC'; //Based on options selected in wp-admin
        $clauses['orderby'] = "
            meta_value $current_order,
            comment_date_gmt
        ";
        return $clauses;
    }
?>