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The Limits of Efficiency for Open- and Closed-World Query Evaluation Under Guarded TGDs

Summary: Pinpoints the tractability frontier: OMQ evaluation under guarded TGDs is FPT iff the UCQ is equivalent to one of bounded treewidth (under standard assumptions). Shows a parallel dichotomy for CQSs (guarded and frontier‑guarded with bounded head size), links OMQ and CQS evaluation, and analyzes the meta-decision problems (bounded arity assumed). (summarized by gpt-5-mini on Feb 09 2026)

Paper ID
1816
Venue
PODS
Year
2020
Pagerank
5.093636e-05
Overall Rank
11,753 | 19.37%
DOI
10.1145/3375395.3387653

Incoming Non-self Citations Over Time

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Authors

BibTeX Citation

@inproceedings{barcelo_pods20,
        address = {New York, NY, USA},
        series = {{PODS} '20},
        title = {{The Limits of Efficiency for Open- and Closed-World Query Evaluation Under Guarded TGDs}},
        url = {https://dl.acm.org/doi/10.1145/3375395.3387653},
        doi = {10.1145/3375395.3387653},
        booktitle = {Proceedings of the {ACM} {SIGMOD} Symposium on {Principles} of {Database} {Systems}},
        publisher = {Association for Computing Machinery},
        author = {Barceló, Pablo and Dalmau, Victor and Feier, Cristina and Lutz, Carsten and Pieris, Andreas},
        year = {2020}
}

Incoming Citations (Sorted by Pagerank)

Showing 2 of 2 citing papers.

Rank Citing Paper Year Venue Pagerank
9,196 Non-Uniformly Terminating Chase: Size and Complexity 2022 PODS 5.3058708e-05
9,291 Efficiently Enumerating Answers to Ontology-Mediated Queries 2022 PODS 5.2910144e-05
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Outgoing Citations (Sorted by Pagerank)

Showing 6 of 6 cited papers.

Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.

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