wordpress function hook - wp_get_archives by category

gistfile1.php

// join term_relationships and term_taxonomy
 add_filter( 'getarchives_join', 'customarchives_join' );
 // add where condition for category
 add_filter( 'getarchives_where', 'customarchives_where' );
 // add where condition for date
 add_filter('getarchives_where','filter_until_year_archives');

function customarchives_join($join_clause) {
 global $wpdb;
 return $join_clause." INNER JOIN $wpdb->term_relationships ON ($wpdb->posts.ID =  $wpdb->term_relationships.object_id) INNER JOIN $wpdb->term_taxonomy ON ($wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id)";
 }

function customarchives_where($where_clause) {
 global $wpdb;
 $include = get_cat_ID('news');  // category id to include
 return $where_clause." AND $wpdb->term_taxonomy.taxonomy = 'category' AND $wpdb->term_taxonomy.term_id IN ($include)";
 }

function filter_until_year_archives($where_clause) {
 $year = '1998.01.01 00:00:00';
 return $where_clause." AND post_date > '".$year."'";
 }