整体优化索引优化功能 #2128
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整体优化索引优化功能 #2128
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Optimizer relies on AdvisorVisitor to provide index optimization suggestions by accessing the abstract syntax nodes of SQL through AdvisorVisitor
sjjian
approved these changes
Dec 8, 2023
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#2117
代码改动
如何实现
首先，实现了一个Optimizer，Optimizer基于SQL语句、执行计划等信息判断SQL语句对应的表是否需要添加索引，如果不需要，返回上层，不给出建议，如果需要，将载入给出索引建议的基本的条件，然后调用AdvisorVisitor给出建议。
第二，实现了五种Advisor，Advisor会根据抽象语法节点、SQL上下文、库表信息等信息给出针对具体SQL和具体表的索引优化建议。Advisor和Visitor组成了AdvisorVisitor，AdvisorVisitor将访问SQL的抽象语法树，对对应的节点调用对应的Advisor，给出相应的建议。
实现的功能有