该代数由基于成本的优化器使用，该优化器能够自由混合使用常规运算符以及与压缩有关的运算符。
This algebra is exploited by a cost-based optimizer that can freely mix regular and compression-aware operators.
利用张量和模代数知识，构造出了自由丛的浸入子丛和任一模丛的浸入子自由丛。
The immersed subbundles of free bundles and the immersed free subbundles of any module bundles are constructed, by using theoretics of tensor and module algebra.
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