Zhelong Zhao

ch8中没有指明b向量为多少

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谢谢整理，笔记很简洁，但有些地方省略后阅读起来有点难受。。

build: better build tools-v2 and mount /etc/hosts

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### What problem does this PR solve? Issue Number: #2602 and #2978 Problem Summary: 1. tools-v2 is in the main process of compiling and cannot be skipped. 2. go1.12.8 dependency...

**Is your feature request related to a problem? (你需要的功能是否与某个问题有关?)** **Describe the solution you'd like (描述你期望的解决方法)** mount `/etc/hosts` to docker **Describe alternatives you've considered (描述你想到的折衷方案)** **Additional context/screenshots (更多上下文/截图)** When I build...

feat: add rename and renamenx

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#30 This PR aims to add rename and renamenx commands for pikiwidb. Running `./pikiwidbtests.sh basic`  There are a few places that I think need to be focused on.