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这里写文章的前言：
一个简单的开头,简述这篇文章讨论的问题、目标、人物、背景是什么？并简述你给出的答案。
可以说说你的故事：阻碍、努力、结果成果，意外与转折。
1.SELECT, INSERT, CREATE and a REPL
In this first post we’ll build enough of a parse to run some simple CREATE, INSERT, and SELECT queries. Then we’ll build an in-memory backend supporting TEXT and INT types and write a basic REPL.
we’ll be able to support the following interaction:
There are some stages to implement:
- map a SQL source into a list of tokens(lexing)
- call parse functions to find individual SQL statements(such as SELECT)
- write an in-memory backend to do operations based on an AST
- write a REPL to accept SQL from CLI and pass it to the in-memory backend.
Lexing
The lexer is responsible fro finding every distinct group of characters in source code: tokens.
2.binary expressions and WHERE filters
总结文章的内容
3. indexs
- 一些引用
- 引用文章
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