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The First Order Truth Behind Undecidability of Regular Path Queries Determinacy

Authors: Grzegorz Głuch, Jerzy Marcinkowski, and Piotr Ostropolski-Nalewaja

Published in: LIPIcs, Volume 127, 22nd International Conference on Database Theory (ICDT 2019)


Abstract
In our paper [Głuch, Marcinkowski, Ostropolski-Nalewaja, LICS ACM, 2018] we have solved an old problem stated in [Calvanese, De Giacomo, Lenzerini, Vardi, SPDS ACM, 2000] showing that query determinacy is undecidable for Regular Path Queries. Here a strong generalisation of this result is shown, and - we think - a very unexpected one. We prove that no regularity is needed: determinacy remains undecidable even for finite unions of conjunctive path queries.

Cite as

Grzegorz Głuch, Jerzy Marcinkowski, and Piotr Ostropolski-Nalewaja. The First Order Truth Behind Undecidability of Regular Path Queries Determinacy. In 22nd International Conference on Database Theory (ICDT 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 127, pp. 15:1-15:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)


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@InProceedings{gluch_et_al:LIPIcs.ICDT.2019.15,
  author =	{G{\l}uch, Grzegorz and Marcinkowski, Jerzy and Ostropolski-Nalewaja, Piotr},
  title =	{{The First Order Truth Behind Undecidability of Regular Path Queries Determinacy}},
  booktitle =	{22nd International Conference on Database Theory (ICDT 2019)},
  pages =	{15:1--15:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-101-6},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{127},
  editor =	{Barcelo, Pablo and Calautti, Marco},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICDT.2019.15},
  URN =		{urn:nbn:de:0030-drops-103175},
  doi =		{10.4230/LIPIcs.ICDT.2019.15},
  annote =	{Keywords: database theory, query, view, determinacy, recursive path queries}
}
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