对查询优化器所在目录下rewrite文件夹和path文件夹内一些重要函数的注释 #25
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Reference: huawei/openGauss-server#25
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Delete Branch "LuoGe/openGauss-server:master"
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rewrite文件夹下的cpp文件的作用是将查询转换为等价但更容易优化的形式。该文件夹下的重写规则可以改变查询中的表达式、连接条件、谓词等,以便更好地适应查询优化的需求,我对其中一些重要的重写函数进行了注释。
path文件夹下的cpp文件的作用是选择最适合执行的查询执行计划路径。我对一些重要的有关表的连接方法的函数作了注释。
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