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Counting Answers to Unions of Conjunctive Queries: Natural Tractability Criteria and Meta-Complexity

Summary: Natural tractability criterion: #UCQ(C) is FPT iff the combined CQ(s) of C and their contracts have bounded treewidth. Closure on C needed; even for a single UCQ, meta-decision NP-hard; exponential-time algorithm optimal; WL-dimension of a UCQ NP-hard. (summarized by gpt-5-nano on Feb 09 2026)

Paper ID
1975
Venue
PODS
Year
2024
Pagerank
5.093636e-05
Overall Rank
11,140 | 23.57%
DOI
10.1145/3651614

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BibTeX Citation

@inproceedings{focke_pods24,
        address = {New York, NY, USA},
        series = {{PODS} '24},
        title = {{Counting Answers to Unions of Conjunctive Queries: Natural Tractability Criteria and Meta-Complexity}},
        url = {https://dl.acm.org/doi/10.1145/3651614},
        doi = {10.1145/3651614},
        booktitle = {Proceedings of the {ACM} {SIGMOD} Symposium on {Principles} of {Database} {Systems}},
        publisher = {Association for Computing Machinery},
        author = {Focke, Jacob and Goldberg, Leslie Ann and Roth, Marc and Živný, Stanislav},
        year = {2024}
}

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