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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| Rank | Cited Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 335 | Optimization of Real Conjunctive Queries | 1993 | PODS | 0.00027036073 |
| 1,522 | The Containment Problem for Real Conjunctive Queries with Inequalities | 2006 | PODS | 0.0001153051 |
| 3,307 | Attacking Diophantus: Solving a Special Case of Bag Containment | 2019 | PODS | 7.2431594e-05 |
| 3,775 | Bag Query Containment and Information Theory | 2020 | PODS | 6.775636e-05 |
| 9,791 | Bag Semantics Conjunctive Query Containment. Four Small Steps Towards Undecidability. | 2024 | PODS | 4.2818172e-05 |
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