将String转换为array< int>在蜂巢 [英] Convert String to array<int> in Hive

问题描述

我有一个用String表示的整数数组.例如，"[1,2,2,3]"

I have a integer array represented with String. For example, "[1,2,2,3]"

Hive表中的字段类型是数组整数，我想知道是否有任何Hive内置UDF可以将上述字符串转换为数组整数.

And the field type in Hive table is the array integer, I was wondering if there is any Hive build-in UDF that can cast the above string into the array integer.

谢谢

推荐答案

tl; dr 我不知道会为您执行此操作的Hive UDF，并且自行转换可能很麻烦

tl;dr I do not know of a Hive UDF that will do this for you, and casting on your own can be gross.

不，没有UDF.至于构建自己的解决方案:

No, there isn't a UDF. As for building your own solution:

投射到array [string]会很容易-只需使用 regexp_replace 放下方括号，然后在，上分割结果字符串即可.

Casting to array[string] would be easy enough - just drop the square brackets using regexp_replace and split the resulting string on ,.

问题是将任意大小的数组从array [string]转换为array [int].您可以逐一地分别转换数组元素:

The problem is converting an array[string] to array[int] for arrays of arbitrary size. You can individually cast the array elements one by one:

hive> select id, my_array from array_table limit 3;
OK
10023307    ["0.20296966","0.17753501","-0.03543373"]
100308007   ["0.16155224","0.1945944","0.09167781"]
100384207   ["0.025892768","0.023214806","-0.003712816"]

hive> select array(cast(my_array[0] as double), cast(my_array[1] as double), cast(my_array[2] as double)) from array_table limit 3;
OK
[0.20296966,0.17753501,-0.03543373]
[0.16155224,0.1945944,0.09167781]
[0.025892768,0.023214806,-0.003712816]

但是这种方法只能用，因为我知道我有长度为3的数组.

but this approach only works because I know I have arrays of length 3.

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