模拟一个sql可重复的例子

Question

我想知道一种在impala中编写最小可重复示例的方法。

这是我的方式。

select 1 as x1, 2 as x2 union all
select 3 as x1, 4 as x2 union all
select 5 as x1, 6 as x2 union all
select NULL as x1, 8 as x2

有没有办法更容易地模拟一个例子？