Fig 3：RNN query • 空间连接查询(Spatial Join Query): – 空间连接查询可以用来确定满足一个给定的连接谓词 关系的所有空间对象对。
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Multiway spatial join is the spatial join query which concern several spatial relations.
空间多路连接是涉及多个空间关系的连接查询。
As a slightly more sophisticated example, here is a query involving a spatial join, that is, a join where the join predicate is a spatial function.
作为一个稍微复杂些的示例，下面给出一个涉及空间联结(即其中的联结谓词是空间函数的联结)的查询。
Distance join is widely used in spatial database. Selectivity estimation for distance join is the basis of optimizing the query of the distance.
距离连接在空间数据库中有着广泛的应用，而距离连接的选择度估计是优化距离查询的基础。
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