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。

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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。

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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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