When generating SQL expressions for measures that reference other measures, the aggregation function might not be used to form the SQL expression for the nested measures.
如果一个度量引用其他度量，那么在为它产生SQL表达式时，不能使用聚合函数来为嵌套的度量产生SQL表达式。
Then apply the aggregation function to the SQL expression resulting from the SQL expression template to form the SQL expression for the measure.
然后，对从SQL表达式模板产生的SQL表达式应用聚合，形成度量的SQL表达式。
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