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 books node at the top of the tree has two child book tags.
树顶部的books节点有两个book子标记。
This cluster has a label at the top location and contains the node known as jhuapl.edu_icon.
这个聚类在顶部位置具有一个标签并包含了已知的jhuapl.edu _ icon节点。
Next, you invoke CAS and copy the new node to the top location.
接下来，调用CAS 内置函数，把新的节点复制到top 位置。
Validation node is at the top level.
“验证”节点将处于顶级。
Validation node is at the top level.
“验证”节点将处于顶级。
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