实现了度量的多种聚合操作及度量和维度的 相互转换。

The model implemented some aggregation operation of measure and mutual conversion from dimension to measure.

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通过Group By操作符可以生成一个结果集，其中包括所需的聚合操作。

The Group By operator enables you to generate a result set that includes the required aggregate operations.

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如果能将聚合操作或选择性非常强的谓词(即能过滤掉很多行的谓词)下推到CF，就可以获得最大的益处。

Being able to push down aggregation operations or very selective predicates to CF (i.e. those that filter out many rows) will result in the greatest benefit.

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