The features of this routing structure are:(1) Combining tree and flow structure, which not only can lookup fast, but also can adapt to the dynamic node join or leave;
该路由结构的特点是：（1）结合了树结构和流结构，使该路由结构不仅能够快速查找，而且还能够适应动态的节点加入或离开；
Find the top join node in a query plan.
查找一个查询计划中的顶级连接节点。
The join node waits for the completion of these two parallel routes before advancing to the second decision point.
连接点等待着两条平行路线都完成，然后进入第二个决策点。
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