modify toString()

    private final String logicTableName;

    private final Optional<String> autoAlias;

    private final Optional<String> alias;

    @Override

    public String toString() {

        if (autoAlias.isPresent()) {

            return " " + columnName + " " + autoAlias.get();

        }

        return " " + columnName;

        String result = " " + columnName;

        return alias.isPresent() ? result + "AS" + alias.get() : result;

    }

}