查询可重写性的前沿之旅

Proceedings of the 41st ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems Pub Date : 2020-12-21 DOI:10.1145/3517804.3524163

Piotr Ostropolski-Nalewaja, J. Marcinkowski, David Carral, S. Rudolph

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引用次数: 2

摘要

我们在理论中介查询应答的背景下考虑(一阶)查询可重写性。我们旅程的起点是FUS/FES猜想，它指出任何是有限扩展集(FES)并允许查询重写(BDD, FUS)的理论必须是一致有界的。我们证明这个猜想适用于一大类BDD理论，我们称之为“局部”。在调查“非局部”BDD理论如何实际得到时，我们发现了意想不到的现象，我们认为这些现象与关于BDD理论的普遍直觉不一致。

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A Journey to the Frontiers of Query Rewritability

We consider (first-order) query rewritability in the context of theory-mediated query answering. The starting point of our journey is the FUS/FES conjecture, which states that any theory that is a finite expansion set (FES) and admits query rewriting (BDD, FUS) must be uniformly bounded. We show that this conjecture holds for a large class of BDD theories, which we call "local". Upon investigating how "non-local" BDD theories can actually get, we discover unexpected phenomena that, we think, are at odds with prevailing intuitions about BDD theories.

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Proceedings of the 41st ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems

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