如何将阵列<int>投射到蜂巢中的字符串？

我有一个类型array<bigint>（说价值[1,2,3,4]）的列，我想将其转换为string（说“1,2,3,4”），我该怎么做？如何将阵列<int>投射到蜂巢中的字符串？

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."

有没有办法投array<bigint>到array<string>？

2017-06-13 Ying Xiong

可能是你的答案就在这里 - https://stackoverflow.com/questions/40977674/how-to-concatenate-the-elemets-of-int-array-to- string-in-hive – aksss

[如何将int数组的元素连接到Hive中的字符串]（https://stackoverflow.com/questions/40977674/how-to-concatenate-the-elemets-of-int-阵列到字符串中-蜂房） – aksss

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

2017-11-14 03:02:40 arya

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