presto-main/src/main/java/io/prestosql/type/UnknownOperators.java/UnknownOperators/greaterThanOrEqual
class UnknownOperators:    @ScalarOperator(GREATER_THAN_OR_EQUAL)
    @SqlType(StandardTypes.BOOLEAN)
    public static boolean greaterThanOrEqual(@SqlType("unknown") boolean left, @SqlType("unknown") boolean right)
    {
        throw new AssertionError("value of unknown type should always be NULL");
    }