The transformation layer will apply an inference process (similar to forward-chaining) and check for each node in the plan tree to see which query transformations apply to that node.
转换层将应用一个推理过程(类似于前推链接法)，并检查规划树中的每个节点，看哪些查询转换适用于该节点。
We can then examine the equivalent symbolic tree representation of this query plan in Figure 1.
随后，我们可以查看图1，其中展示了这个查询计划的等效符号树表示形式。
Enables or disables query plan tracing, also known as a plan tree, which captures the transformation process of a query.
启用或禁用查询规划跟踪，也称为规划树，它捕获一个查询的转换流程。
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