Enumeration for FO Queries over Nowhere Dense Graphs

Enumeration for FO Queries over Nowhere Dense Graphs
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无处密集图上 FO 查询的枚举

DOI:
10.1145/3196959.3196971
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发表时间:
2018
期刊:
Proceedings of the 37th ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems
影响因子:
--
通讯作者:
Alexandre Vigny
Alexandre Vigny
中科院分区:
--
文献类型:
--
作者:
Nicole Schweikardt;Luc Segoufin;Alexandre Vigny

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我们考虑的评价一阶查询的数据库arenowhere density.The概念无处密集类介绍了Nesetril和Ossona德门德斯作为一种形式化的类的“稀疏”的图形和推广许多著名的类的图形,如类的有界度,有界树宽度,或有界扩展。最近Grohe、Kreutzer和Siebertz证明了,在任何稠密类的数据库中,一阶句子都可以在伪线性时间内计算(伪线性时间意味着对于所有ε,存在一个在时间O(n1+ε)内工作的算法,其中ε是数据库的大小)。对于一阶查询的较高的arities,我们表明,在任何无处密集类的数据库,其解决方案的集合可以枚举后的伪线性时间预处理常数延迟。在同一背景下,我们还表明,经过伪线性时间预处理,我们可以在输入的元组,测试在恒定的时间是否是一个解决方案的查询。
We consider the evaluation of first-order queries over classes of databases that arenowhere dense.The notion of nowhere dense classes was introduced by Nesetril and Ossona de Mendez as a formalization of classes of "sparse" graphs and generalizes many well-known classes of graphs, such as classes of bounded degree, bounded tree-width, or bounded expansion. It has recently been shown by Grohe, Kreutzer, and Siebertz that over nowhere dense classes of databases, first-order sentences can be evaluated in pseudo-linear time (pseudo-linear time means that for all ε there exists an algorithm working in time O(n1+ε), wherenis the size of the database). For first-order queries of higher arities, we show that over any nowhere dense class of databases, the set of their solutions can be enumerated with constant delay after a pseudo-linear time preprocessing. In the same context, we also show that after a pseudo-linear time preprocessing we can, on input of a tuple, test in constant time whether it is a solution to the query.
具有局部有界扩展的数据库上 FO 查询的恒定延迟枚举
DOI: --
发表时间: 2017
期刊: International Conference on Database Theory
影响因子: --
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