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Index-related operations are included in ALTER privilege, like building, dropping index.
Default Roles
There are two default roles: admin, public.
Role admin have ALL the privilege. Role public only has READ and LOAD privileges.TODO
APIs
For every API, parameter tenant is mandatory for avoiding loading too much data to memory.
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Only root user can create roles. Role name cannot be "admin" or "public".
2、Grant & revoke privileges
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