如何将 array<int> 转换为 hive 中的字符串？

Question

我有一列 array<bigint> 类型的列（例如值 [1,2,3,4]），我想将其转换为 string （例如“1,2,3,4”），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> 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