featurehelp wanted
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Is your feature request related to a problem? Please describe. A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] 当前需要有一些手段来控制运行时的参数，比如是否打开rewriter，或者打开关闭某些规则。
Describe the solution you'd like A clear and concise description of what you want to happen. 增加系统变量，可以动态更新。 参考MySQL的设计，可以增加全局变量、会话变量的概念，并支持修改和查询。