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a result size estimation 查询代价估计
Frequently, developers adopt a conservative estimation of the maximum size, which may result in a significant waste of memory resources.
开发人员经常采用最大数据尺寸的保守估计，而这样可能导致严重的内存资源浪费。
Histogram is the common method for size estimation of query result in many commercial database systems.
直方图是许多商用数据库系统中最常用的一种估算查询结果大小的方法。
In this paper, a new histogram method for the size estimation of query result is presented.
提出了一种新的用于估算查询结果大小的直方图方法。
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