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Expressiveness and static analysis of extended conjunctive regular path queries

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conference contribution
posted on 05.09.2017 by Dominik Freydenberger, Nicole Schweikardt
We 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 Proceedings

Volume

749

Citation

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 9

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CEUR-WS.org (© the authors)

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NA (Not Applicable or Unknown)

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This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2011

Notes

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ISSN

1613-0073

Book series

CEUR Workshop Proceedings;749

Language

en

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