如何将数组<int>转换为配置单元中的字符串？

Question

我有一个类型为

array<bigint>

的列（例如值 [1,2,3,4]），我想将其转换为

string

（例如“1,2,3,4”），如何才能我这样做？

我尝试过

concat_ws(',' arr)

，但它抱怨

Argument 2 of function CONCAT_WS must be "string or array<string>", but "array<bigint>" was found."

有没有办法将

array<bigint>

转换为

array<string>

？

Answer 1

试试这个：

select xx,concat_ws(',',collect_set(cast(element as string))) as arrystr
from table
lateral view explode(arr) b as element
group by xx

Answer 2

试试这个：

select
    regexp_replace(string_with_brackets,'\\[|\\]','') as final_str
from
(
    select 
    transform(array_of_int) using '/bin/cat' as (string_with_brackets)
)