presto-parser/src/main/java/io/prestosql/sql/tree/SetRole.java/SetRole/SetRole
class SetRole:    private SetRole(Optional<NodeLocation> location, Type type, Optional<Identifier> role)
    {
        super(location);
        this.type = requireNonNull(type, "type is null");
        this.role = requireNonNull(role, "role is null");
    }