我试图在一堆配置单元表上运行descripe，并希望创建一堆cte，然后合并它们。像这样：

With t1 as (describe sch1.tab1)
, t2 as (describe sch1.tab2)
, t3 as (describe sch1.tab3)
select *
from t1 UNION
select *
from t2 UNION
select * 
from t3

不幸的是，当我尝试这样做时，我得到了这个错误：

Error while compiling statement: FAILED: ParseException line 1:15 Failed to recognize predicate 'describe'. Failed rule: 'identifier' in table name

有什么建议吗？