https://blog.wongcw.com/2020/07/02/opengauss-%e6%ad%a3%e5%bc%8f%e9%96%8b%e6%ba%90%e4%b8%a6%e6%88%90%e7%ab%8b%e9%96%8b%e6%ba%90%e7%a4%be%e5%8d%80/