用于对连续行进行分组的SQL函数

我有一个案例最初是在excel中完成的，我正试图在查询中复制它。我的数据结构如下：

Field1 | Field2
---------------
1      |5
2      |10
3      |5
4      |10
5      |5

我需要一个可以按/agg按连续3行分组的函数，以便返回：

Field1 | Field2
---------------
123    |20
234    |25
345    |20

使用LEAD功能，如中所示：

with
x as (
  select
    field1 as x1,
    lead(field1) as x2,
    lead(field1, 2) as x3,
    field2 as y1,
    lead(field2) as y2,
    lead(field2, 2) as y3
  from my_table
)
select
  x1 + x2 + x3 as field1,
  y1 + y2 + y3 as field2
from x
where x1 is not null
  and x2 is not null
  and x3 is not null