Mysql源码学习——词法分析MYSQLlex
客户端向服务器发送过来SQL语句后，服务器首先要进行词法分析，而后进行语法分析，语义分析，构造执行树，生成执行计划。词法分析是第一阶段，虽然在理解Mysql实现上意义不是很大，但作为基础还是学习下比较好。词法分析即将输入的语句进行分词(token)，解析出每个token的意义。
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