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。
On successful completion of join node, the control is passed to the end node, which ends the process.
join节点成功完成之后，控制权就会传递给end节点，它会结束这个过程。
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。
应用推荐