SET ROLE ( role | ALL | NONE )
SET ROLE sets the enabled role for the current session in the current catalog.
SET ROLE role enables a single specified role for the current session. For the
SET ROLE role statement to succeed, the user executing it should have a grant for the given role.
SET ROLE ALL enables all roles that the current user has been granted for the current session.
SET ROLE NONE disables all the roles granted to the current user for the current session.
Some connectors do not support role management. See connector documentation for more details.