presto-main/src/main/java/io/prestosql/type/VarcharOperators.java/VarcharOperators/greaterThanOrEqual
class VarcharOperators:    @LiteralParameters("x")
    @ScalarOperator(GREATER_THAN_OR_EQUAL)
    @SqlType(StandardTypes.BOOLEAN)
    public static boolean greaterThanOrEqual(@SqlType("varchar(x)") Slice left, @SqlType("varchar(x)") Slice right)
    {
        return left.compareTo(right) >= 0;
    }