1）数据 json数组
[{"name":"大郎","sex":"男","age":"25"},{"name":"西门庆","sex":"男","age":"47"}]
2）取出第一个json对象
select get_json_object('[{"name":"大郎","sex":"男","age":"25"},{"name":"西门庆","sex":"男","age":"47"}]','$[0]');
结果是：{“name”:“大郎”,“sex”:“男”,“age”:“25”}
3）取出第一个json的age字段的值
hive (gmall)>SELECT get_json_object('[{"name":"大郎","sex":"男","age":"25"},{"name":"西门庆","sex":"男","age":"47"}]',"$[0].age");
结果是：25