The relevant factor that impacts the complexity of the job is the number of different grouping keys, not the number of different aggregated columns that you would see in counting functions.
影响任务复杂性的相关要素是不同分组关键字的数量，而不是在计数函数中所看到的，不同的所聚合列的数量。
Functions of the job service concept: Only better, not the best.
职能工作服务理念：只有更好，没有最好。
Functions of the job service concept: Only better, not the best.
职能工作服务理念：只有更好，没有最好。
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