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Expressiveness and static analysis of extended conjunctive regular path queries
conference contribution
posted on 2017-09-05, 13:47 authored by Dominik FreydenbergerDominik Freydenberger, Nicole SchweikardtWe study the expressiveness and the complexity of static analysis of extended conjunctive regular path queries (ECRPQs), introduced by Barceló et al. (PODS '10). ECRPQs are an extension of con- junctive regular path queries (CRPQs), a well-studied language for querying graph structured databases. Our first main result shows that query containment and equivalence of a CRPQ in an ECRPQ is undecidable. This settles one of the main open problems posed by Barceló et al. As a second main result, we prove a non-recursive succinctness gap between CRPQs and the CRPQ-expressible fragment of ECRPQs. Apart from this, we develop a tool for proving inexpressibility results for CRPQs and ECRPQs. In particular, this enables us to show that there exist queries definable by regular expressions with backreferencing, but not expressible by ECRPQs.
History
School
- Science
Department
- Computer Science
Published in
CEUR Workshop ProceedingsVolume
749Citation
FREYDENBERGER, D.D. and SCHWEIKARDT, N., 2011. Expressiveness and static analysis of extended conjunctive regular path queries. IN: Barceló, P. and Tannen, V. (eds). CEUR Workshop Proceedings: Proceedings of the 5th Alberto Mendelzon International Workshop on Foundations of Data Management (AMW2011), Santiago, Chile, May 9-12, 2011, vol. 749, paper 9Publisher
CEUR-WS.org (© the authors)Version
- NA (Not Applicable or Unknown)
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2011Notes
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1613-0073Publisher version
Book series
CEUR Workshop Proceedings;749Language
- en