虚拟数据集将根据合并运算符合并来自子数据集的结果。
The results are aggregated by the virtual cube according to the merge operator.
当对某个虚拟数据集执行查询时，查询将被发送到子数据集，子数据集将生成两个中间结果，这两个结果又将根据虚拟数据集的合并运算符进行合并。
When a query is issued against a virtual cube, that query is routed to the depending cubes, which produces two intermediary results that are aggregated according to the virtual cube's merge operator.
合并运算符包括SUM、MINUS、PRODUCT、DIVIDE、MAX、MIN和NOP(从虚拟数据集定义的第一个数据集返回数据)。
Merge operators are SUM, MINUS, PRODUCT, DIVIDE, MAX, MIN, and NOP (returns data from the first cube in the virtual cube definition).
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