如何在Hive中将数组<date>转换为数组<string>

Question

我想将数组转换为数组字符串，以便["2016-06-02","2016-06-02"]成为2016-06-02| 2016-06-02

Answer 1

使用concat_ws(string delimiter, array<string>)函数连接数组：

select concat_ws(',',collect_set(date)) from table;

如果日期字段不是字符串，则将其转换为字符串：concat_ws(',',collect_set(cast(date as string)))