oracle listagg替代wm_concat()函数 解决wm_concat()查询速率过低问题

原sql：
select e.comment_id, e.evaluate_type, wmsys.wm_concat(evaluate_label) labels
from evaluating_label e
where exists(select *
             from evaluation o
             where o.order_id = '123' and e.comment_id = o.id)
group by e.comment_id, e.evaluate_type

效率极低，三万多条数据十多分钟都没查出来

替换listagg后

select e.comment_id,
       e.evaluate_type,
       listagg(e.EVALUATE_LABEL, ',') within
           group (
           order by null) labels
from evaluating_label e
where exists
          (select *
           from evaluation o
           where o.order_id = '123' and e.comment_id = o.id)
group by e.comment_id, e.evaluate_type;

三秒内就出结果了。。。。

补充函数文档说明:
listagg()
String Aggregation Techniques

值得一提的是,WM_CONCAT在12c后的版本被删除掉了.