第一次调用udf的时候，需要初始化groupmap属性，然后再继续正常调用过程中的一般性处理。

In the first call to the UDF, we need to initialize the groupMap attribute and continue with the usual processing for the normal calls.

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在程序的正常操作过程中，当调用一个函数时，被调用函数的所有参数以及返回位置的指针都放在栈中。

During normal operation of a program, when a function is called, any arguments for the called function along with a pointer to the return location are placed onto the stack.

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因此，本地过程中位于无效远程过程调用之前的语句可能全部运行正常，而之后的语句则根本不会运行。

Therefore, all statements in a local procedure that precede an invalid procedure call might run successfully. Statements subsequent to an invalid procedure call do not run at all.

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