如何在hive中将数组<int>转换为字符串？

Question

我有一个类型为array<bigint>的列（比如值[1,2,3,4]），我希望将其转换为string（例如＆＃34; 1,2 ，3,4＆＃34;），我该怎么做？

我试过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>投放到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