get_json_object()函数
get_json_object(string json_string, string path)
说明:
第一个参数填写json对象变量,
第二个参数使用$表示json变量标识,然后用 . 或 [] 读取对象或数组;如果输入的json字符串无效,那么返回NULL。
每次只能返回一个数据项。
data =
{
"store":
{
"fruit":[{"weight":8,"type":"apple"}, {"weight":9,"type":"pear"}],
"bicycle":{"price":19.95,"color":"red"}
},
"email":"amy@only_for_json_udf_test.net",
"owner":"amy"
}
get单层值
hive> select get_json_object(data, '$.owner') from test;
结果:amy
get多层值.
hive> select get_json_object(data, '$.store.bicycle.price') from test;
结果:19.95
get数组值[]
hive> select get_json_object(data, '$.store.fruit[0]') from test;
结果:{“weight”:8,“type”:“apple”}