文章《Why SQLite Uses Bytecode》详细探讨了SQLite为何选择使用字节码（Bytecode）来执行SQL语句，而不是使用对象树（Tree-Of-Objects）的方法。文章首先介绍了SQL数据库引擎的基本工作原理，即将输入的SQL文本翻译成“预备语句”，然后执行该语句以生成结果。在SQLite中，预备语句被翻译成虚拟机语言（字节码），并由虚拟机解释执行。

文章指出，字节码的使用有多种优势，包括：

1. 易于理解：字节码可以以表格形式展示，使得SQL语句的实现方式一目了然。

2. 易于调试：字节码提供了前端解析和后端执行的清晰分离，便于快速定位问题。

3. 支持增量执行：字节码可以逐步执行SQL语句，适合SQLite的库模式。

4. 占用空间小：字节码通常比解析器生成的抽象语法树（AST）更小。

5. 执行速度快：字节码在执行时需要做的决策更少，理论上更快。

同时，文章也承认对象树方法的优点，如在运行时可以调整查询计划和易于并行化处理等。

原文链接：https://sqlite.org/draft/whybytecode.html

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