Wordpress - Sort Admin Table Column by Taxonomy

functions.php

// functions.php

/**
* Snippet to create allow a custom admin column to be sortable when it uses Taxonomy terms
**/
if(!function_exists('sz_sort_POSTNAME_by_COLUMN-NAME')){
    function sz_sort_POSTNAME_by_COLUMN-NAME($clauses, $wp_query){

        global $wpdb;
        if(isset($wp_query->query['orderby']) && $wp_query->query['orderby'] == 'YOUR ORDERBY FIELD'){
            $clauses['join'] .= <<<SQL
LEFT OUTER JOIN {$wpdb->term_relationships} ON {$wpdb->posts}.ID={$wpdb->term_relationships}.object_id
LEFT OUTER JOIN {$wpdb->term_taxonomy} USING (term_taxonomy_id)
LEFT OUTER JOIN {$wpdb->terms} USING (term_id)
SQL;
            $clauses['where'] .= "AND (taxonomy = 'YOUR-TAXONOMY' OR taxonomy IS NULL)";
            $clauses['groupby'] = "object_id";
            $clauses['orderby'] = "GROUP_CONCAT({$wpdb->terms}.name ORDER BY name ASC)";
            if(strtoupper($wp_query->get('order')) == 'ASC'){
                $clauses['orderby'] .= 'ASC';
            } else{
                $clauses['orderby'] .= 'DESC';
            }
        }
        return $clauses;
    }
    add_filter('posts_clauses', 'sz_sort_POSTNAME_by_COLUMN-NAME', 10, 2);
}