Complete the following steps to create and program the Group By operator.
完成以下步骤，创建GroupBy操作符并对它进行配置。
That program can determine the priority of each operator, and then calculated and analyzed.
也就是说程序能判定各个运算符的优先权，然后进行分析计算。
That program can determine the priority of each operator, and then calculated and analyzed.
也就是说程序能判定各个运算符的优先权，然后进行分析计算。
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