THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
...
Setting role_name to NONE will remove all current roles from the current user. (It's introduced in HIVE-11780 and will be included in the upcoming versions 1.3.0 and 1.2.2.)
If a role the user does not belong to is specified as the role_name, it will result in an error.
...