Google bigquery bigquery lead窗口函数有没有办法使用表值作为偏移量？

我想知道bigquery标准sql中的lead window函数是否存在使用表值而不是文本或查询参数的解决方法

select 
artcl
,days
,lead(days,ofst)over(partition by artcl order by days) as tst
from(
    select 123 as artcl, 1 as days ,2 as ofst
    union all
    select 123 as artcl, 2 as days ,2 as ofst
    union all
    select 123 as artcl, 3 as days ,2 as ofst
)

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你可以使用下面的方法

select artcl, days, ofst,
  arr[safe_offset(row_number() over(partition by artcl order by days) + ofst - 1)] as tst
from `project.dataset.table`
join (
  select artcl, array_agg(days order by days) arr, 
  from `project.dataset.table`
  group by artcl
)
using(artcl)

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考虑一下，也可以帮助回答这个问题。