Defines a function node in a query expression tree.

定义查询表达式树中的函数节点。

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Each function node lists all the functions that it called and performance data about those function calls.

每个函数节点都列出它调用的所有函数以及有关这些函数调用的性能数据。

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Each function node lists all the functions that it called and performance data about those function calls.

每个函数节点都列出它调用的所有函数以及有关这些函数调用的性能数据。

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