背景
数据处理中，经常碰到复杂数据类型，需要将他们进行解析才能利用。
复杂数据类型
1、MAP结构转为列
sql
WITH tmp AS (
SELECT '{"Users":{"4418":{"UserId":4418,"Score":0,"IsStudent":true},"5866":{"UserId":5866"Score":0,"IsStudent":false}}}' AS js
)
SELECT
uid
,info
-- ,FROM_JSON(GET_JSON_OBJECT(js,'$.Users'),'MAP<STRING,STRING>')
FROM tmp AS t1
LATERAL VIEW EXPLODE(FROM_JSON(GET_JSON_OBJECT(js,'$.Users'),'MAP<STRING,STRING>')) t1 AS uid,info
;