SET ROLE ( role | ALL | NONE ) [ IN catalog ]
SET ROLE sets the enabled role for the current session.
SET ROLE role enables a single specified role for the current session.
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
SET ROLE NONE disables all the roles granted to the current user for the
IN catalog clause sets the role in a catalog as opposed
to a system role.
Some connectors do not support role management. See connector documentation for more details.