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通常，回归表现为执行故障修复期间执行程序更改得到的意外结果。
Typically, regressions occur as an unintended consequence of program changes during a bug fix.
我们可以利用两个故障修复技术来了解一个执行速度较慢的查询中是否进行了本地处理。
To see if local processing is occurring for a slow performing query, there are a couple of troubleshooting techniques.
正如你大概已经了解到的，一个补丁不会刚好直接进入内核，当作为一个必备的故障修复或者新功能而提交的时候。
As you'll have figured out a patch doesn't just go straight into the kernel upon being put forth as a must-have bug fix or new feature.
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