Enumerating Answers to First-Order Queries over Databases of Low Degree

10/16/2020

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by   Arnaud Durand, et al.

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A class of relational databases has low degree if for all δ>0, all but finitely many databases in the class have degree at most n^δ, where n is the size of the database. Typical examples are databases of bounded degree or of degree bounded by log n. It is known that over a class of databases having low degree, first-order boolean queries can be checked in pseudo-linear time, i.e. for all ϵ>0 in time bounded by n^1+ϵ. We generalize this result by considering query evaluation. We show that counting the number of answers to a query can be done in pseudo-linear time and that after a pseudo-linear time preprocessing we can test in constant time whether a given tuple is a solution to a query or enumerate the answers to a query ith constant delay.