包括优化器和执行器
3 优化器：
https://mp.weixin.qq.com/s/dOQUraSsTdpc5TKu_id_bw
https://mp.weixin.qq.com/s/K2cXqFf-DsRn3z_pqf8P4w
https://mp.weixin.qq.com/s/qdR3DHV-fan6FfENKhqOAQ
https://mp.weixin.qq.com/s/1duffrGhNq_DzMSYrbCdhw
http://mysql.taobao.org/monthly/2016/01/04/
https://blog.csdn.net/qq_42604176/article/details/115801228
https://blog.csdn.net/joenqc/article/details/104094042
https://blog.51cto.com/u_15080020/2655818
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