fix:修复升级达梦数据库的表结构时由于select中字符串精读问题，而导致字符串截取的问题 #1922
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在达梦数据库中，表结构上的字符串长度以字符为单位，而在cast函数转换数据类型时，是以字节为单位。
我们在使用FreeSql对达梦数据库进行表结构升级时，就会出现重新insert到原表时，一些较长的字符串就会被截断，导致数据不一致。
我跟达梦官方的论坛上提了问题，看这个情况应该就是达梦的特性。。。。
https://eco.dameng.com/community/question/ee053ae1bafba93b665c74a3b3f71b53
同时，我在单元测试中增加了升级测试的代码，原始的代码是不通过的