You can use this information for advanced understanding of the decisions and rules that are executed to produce an execution tree.
您可以使用该信息深入理解为生成执行树而执行的决策和规则。
Third, with the syntax tree gone, the interpreter no longer needs to propagate execution state between syntax tree nodes.
第三，由于不再需要语法树，解释器无需继续在语法树节点间传送执行状态。
It's best to read such execution plans from the left-lowest operator in the tree, since the logical flow in the plan is from bottom to top and left to right.
因为执行计划中的逻辑流是自下而上、从左到右，所以看此类执行计划时，最好是从树中左下方的操作符开始。
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