this will be done in some configuration file rather than DDL dialect in ClickHouse

We may reuse some existed libraries, for example, casbin-rs.

• 1.0 BRSL(Base Resources Spec Language)
  • casbin-rs investigation(use or not use?)
  • RFC for lang
• 2.0 In-Base Auth Implementation
  • primary user/password impl
  • popular 3rd-party auth platform