Experimental results show that reducing query space can improve the indexing performance effectively and reduce the cost for IO and CPU.

实验结果表明，这种查询空间精练策略能够有效的提高索引的性能，降低相似性查询的IO代价和CPU代价。

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Meanwhile, the optimization also includes reducing the computational complexity of the query optimization of trimming, and query results combination which considered both space and time cost.

同时，优化中还包括降低计算复杂度的查询裁剪的优化，以及兼顾空间和时间开销的查询结果合并方式。

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