variant字段解析问题，求助！

SELECT business_info['role'] role from log

variant字段解析，报错信息如下：
[2024-11-14 20:23:33] [HY000][1105] errCode = 2, detailMessage = Syntax error in line 2:
[2024-11-14 20:23:33] business_info['role'] role
[2024-11-14 20:23:33] ^
[2024-11-14 20:23:33] Encountered: ROLE
[2024-11-14 20:23:33] Expected: ||, COMMA, ROLE is keyword, maybe `ROLE`