Relevanssi category parents indexing

// index categories
if ("on" == get_option("relevanssi_include_cats")) {
    $post_categories = get_the_category($post->ID);
    if (is_array($post_categories)) {
        foreach ($post_categories as $p_cat) {
            $cat_name = apply_filters("single_cat_title", $p_cat->cat_name);
            $cat_tokens = relevanssi_tokenize($cat_name);
            foreach ($cat_tokens as $pcat => $count) {
                if (strlen($pcat) < $min_word_length) continue;
                $n++;
                $wpdb->query("INSERT INTO $relevanssi_table (doc, term, tf, title)
                VALUES ($post->ID, '$pcat', $count, 4)");
            }
            if ("on" == get_option("relevanssi_include_cats_parents")) {
                $cat_parent = $p_cat;
                while ($cat_parent->parent && ($cat_parent->parent != $cat_parent->term_id)) {
                    $cat_parent = get_category($cat_parent->parent);
                    $cat_parent_name = apply_filters("single_cat_title", $cat_parent->cat_name);
                    $cat_parent_tokens = relevanssi_tokenize($cat_parent_name);
                    foreach ($cat_parent_tokens as $pcat => $count) {
                        if (strlen($pcat) < $min_word_length) continue;
                        $n++;
                        $wpdb->query("INSERT INTO $relevanssi_table (doc, term, tf, title)
                        VALUES ($post->ID, '$pcat', $count, 4)");
                    }
                }
            }
        }
    }
}