我在优化此查询时遇到问题:SET@SEARCH="dokumentalne";SELECTSQL_NO_CACHE`AA`.`version`AS`Version`,`AA`.`contents`AS`Contents`,`AA`.`idarticle`AS`AdressInSQL`,`AA`.`topic`AS`Topic`,MATCH(`AA`.`topic`,`AA`.`contents`)AGAINST(@SEARCH)AS`Relevance`,`IA`.`url`AS`URL`FROM`xv_article`AS`AA`INNERJOIN`xv_articleindex`A