presto-plugin-toolkit/src/main/java/io/prestosql/plugin/base/authentication/KerberosTicketUtils.java/KerberosTicketUtils/isOriginalTicketGrantingTicket
class KerberosTicketUtils:    public static boolean isOriginalTicketGrantingTicket(KerberosTicket ticket)
    {
        return isTicketGrantingServerPrincipal(ticket.getServer());
    }