单词：hash index
hash index的用法和样例：
例句
- Method will return the lowest column index.方法将返回最低的列索引。
- Hashed indices can be used as an alternative to ordered indices when fast look-up is needed and sorting information is of no interest.当需要快速查找且不关心排序信息时，可以用散列索引来替代有序索引。
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