hive函数 get_json_object

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转载

https://www.cnblogs.com/drjava/p/10486134.html

hive提供了json的解析函数：get_json_object

使用方法

对于jsonArray（json数组），如person表的xjson字段有数据：

[{"name":"王二狗","sex":"男","age":"25"},{"name":"李狗嗨","sex":"男","age":"47"}]

取出第一个json对象，那么hive sql为：

SELECT get_json_object(xjson,"$.[0]") FROM person;

结果是：

{"name":"王二狗","sex":"男","age":"25"}

取出第一个json的age字段的值：

SELECT get_json_object(xjson,"$.[0].age") FROM person;

结果

25

总结

get_json_object(param1,"$.param2")

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