hadoop - 我们如何在配置单元中将字符串转换为数组？

Question

我正在使用配置单元 1.1

 hive> select country from releases limit 1;
 OK
 ["us","ca","fr"]

目前 country 在 hive 中是字符串类型。我如何将其转换为 Array[String]？

我尝试了下面的方法，但是它抛出错误

 hive> select country, cast(country as Array[String]) from releases limit 1;
 FAILED: ParseException line 1:48 cannot recognize input near 'Array' '[' 'String' in primitive type specification

有人可以帮我做类型转换吗？

Answer 1

hive> with releases as (select '["us","ca","fr"]' as country)
    > select  split(regexp_extract(country,'^\\["(.*)\\"]$',1),'","')
    > from    releases
    > ;
OK
_c0
["us","ca","fr"]