How to resolve org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: for near line 1

Question

例如我的hql：

select (select stuff((select ', ' + usrProd.product.externalId from UserProductsVO usrProd where usrProd.user.id = u.id for xml path('')), 1,1, '')) as productIds
from UserVO u
where u.id = 121323

我提到我在 hibernate 中注册了 stuff 函数，我想注册一些 xml path() 的 sql 语法，这可能吗？