tidb不支持utf8mb4_0900_as_cs吗？
tidb lightning encountered error: [Lightning:Restore:ErrCreateSchema]create schema failed, table: hedun.wx_applet_user_info, stmt: restore table schema: run create schema job failed: Error 1273 (HY000): Unsupported collation when new collation is enabled: ‘utf8mb4_0900_as_cs’
