hive处理JSON字符串，有固定的get_json_object函数可以使用

测试数据

{"store":{"fruit":[{"weight":8,"type":"apple"},{"weight":9,"type":"pear"}],"bicycle":{"price":19.951,"color":"red1"}},"email":"amy@only_for_json_udf_test.net","owner":"amy1"}

1、查找JSON中某个参数

select get_json_object('{"store":{"fruit":[{"weight":8,"type":"apple"},{"weight":9,"type":"pear"}],"bicycle":{"price":19.951,"color":"red1"}},"email":"amy@only_for_json_udf_test.net","owner":"amy1"}', '$.owner')

select get_json_object(data, '$.response') from jsontest limit 1;

2、查找JSON中数组元素，且支持嵌套。

select get_json_object('{"store":{"fruit":[{"weight":8,"type":"apple"},{"weight":9,"type":"pear"}],"bicycle":{"price":19.951,"color":"red1"}},"email":"amy@only_for_json_udf_test.net","owner":"amy1"}', '$.store.fruit[0].weight')

select get_json_object(data, '$.response.tags') from jsontest limit 1;

3、JSON格式的要求，必须是标准的JSON格式，且字符串用 "" 引起来