Bag Semantics Query Containment: The CQ vs. UCQ Case and Other Stories
Summary: New technique maps a UCQ Φ to a CQ φ that approximates Φ under multiset (bag) semantics, enabling a fresh analysis of bag query containment when one side is a CQ and the other a UCQ and revealing surprising decidability/undecidability boundaries. Authors nearly transfer the known undecidability of QCP_bag_UCQ to the CQ-vs-CQ case but are stopped just short of a full undecidability proof. (summarized by gpt-5-mini on Feb 11 2026)
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Authors
- 1. Jerzy Marcinkowski (University of Wrocław)
- 2. Piotr Ostropolski-Nalewaja (University of Wrocław)
BibTeX Citation
@inproceedings{marcinkowski_pods26,
address = {New York, NY, USA},
series = {{PODS} '26},
title = {{Bag Semantics Query Containment: The CQ vs. UCQ Case and Other Stories}},
url = {https://dl.acm.org/doi/10.1145/3767711},
doi = {10.1145/3767711},
booktitle = {Proceedings of the {ACM} {SIGMOD} Symposium on {Principles} of {Database} {Systems}},
publisher = {Association for Computing Machinery},
author = {Marcinkowski, Jerzy and Ostropolski-Nalewaja, Piotr},
year = {2026}
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Outgoing Citations (Sorted by Pagerank)
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Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.
| Rank | Cited Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 309 | Optimization of Real Conjunctive Queries | 1993 | PODS | 0.00021768596 |
| 1,269 | The Containment Problem for Real Conjunctive Queries with Inequalities | 2006 | PODS | 0.000113935 |
| 3,457 | Bag Query Containment and Information Theory | 2020 | PODS | 7.3981641e-05 |
| 3,498 | Attacking Diophantus: Solving a Special Case of Bag Containment | 2019 | PODS | 7.3629798e-05 |
| 9,946 | Bag Semantics Conjunctive Query Containment. Four Small Steps Towards Undecidability. | 2024 | PODS | 5.1915905e-05 |
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