Bitemporal tables allow you to track both system and business time in a single table, and time periods can be added to indicate start and end points.
双时间(bitemporal)表支持在单个表中同时跟踪系统时间和业务时间，可以添加时间区间来表明起始和结束点。
A new version column is added to sysfragments system catalog table to keep track of changes to statistics information.
在sysfragments系统目录表格中添加一个新版本的列，跟踪统计信息更改。
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