Issue 1: The impact of DPSI structure on sorts.

问题1：dpsi结构对排序的影响。

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The impact of a data-partitioned secondary index (DPSI) structure on ORDER BY sort avoidance.

一个分区数据二级索引(data - partitioned secondary index, DPSI)结构对ORDER BY排序规避的影响。

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For a DPSI where qualified rows are in more than one partition, every probe skips between partitions.

对于一个DPSI，其中符合条件的行在多个分区中，每个探针在分区之间跳来跳去。

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