Cary issues

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                                            Cary

There is no version in the data that has been serialized and saved. How can I read it in a program that has been upgraded with CEREAL_CLASS_VERSION?

存储一条数据里包含code(32为字符串)，remark(普通字符串)和10个数值字段数据量在5000万条记录以上。现在想通过code值进行查询，如何设计库表能支持快速查询？