在使用casbin v2.71.1 和casbin/gorm-adapter/v3 v3.18.0的时候，数据库使用的是阿里云PolarDB-X 2.0 mysql ，在调用到hasIndex函数的时候查询不到唯一索引的存在
Comment From: allendaydayup
gorm的版本是v1.25.2
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