Answering (Unions of) Conjunctive Queries using Random Access and Random-Order Enumeration
Summary: Free-connex acyclic CQs admit linear preprocessing with polylog-delay enumeration, true random-order enumeration, and polylog random-access, while other CQs (no self-joins) are intractable under fine-grained assumptions. For UCQs the yardsticks separate: unions of free-connex acyclic CQs may be enumerable but lack random-access; paper gives an expected-log-delay random-order enumeration, a UCQ subclass with polylog random-access, and an implementation showing practical gains. (summarized by gpt-5-mini on Feb 09 2026)
Incoming Non-self Citations Over Time
Authors
- 1. Nofar Carmeli (Technion)
- 2. Shai Zeevi (Technion)
- 3. Christoph Berkholz (Humboldt University of Berlin)
- 4. Benny Kimelfeld (Technion)
- 5. Nicole Schweikardt (Humboldt University of Berlin)
BibTeX Citation
@inproceedings{carmeli_pods20,
address = {New York, NY, USA},
series = {{PODS} '20},
title = {{Answering (Unions of) Conjunctive Queries using Random Access and Random-Order Enumeration}},
url = {https://dl.acm.org/doi/10.1145/3375395.3387662},
doi = {10.1145/3375395.3387662},
booktitle = {Proceedings of the {ACM} {SIGMOD} Symposium on {Principles} of {Database} {Systems}},
publisher = {Association for Computing Machinery},
author = {Carmeli, Nofar and Zeevi, Shai and Berkholz, Christoph and Kimelfeld, Benny and Schweikardt, Nicole},
year = {2020}
}
Incoming 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 |
|---|---|---|---|---|
| 37 | DISCOVER: Keyword Search in Relational Databases | 2002 | VLDB | 0.00048017193 |
| 54 | On Random Sampling over Joins | 1999 | SIGMOD | 0.00040810225 |
| 131 | Ripple Joins for Online Aggregation | 1999 | SIGMOD | 0.00030424509 |
| 136 | Join Synopses for Approximate Query Answering | 1999 | SIGMOD | 0.00030123303 |
| 802 | Random Sampling over Joins Revisited | 2018 | SIGMOD | 0.00013907725 |
| 816 | The Dynamic Yannakakis Algorithm: Compact and Efficient Query Processing Under Updates | 2017 | SIGMOD | 0.00013827772 |
| 1,542 | Keyword Proximity Search in Complex Data Graphs | 2008 | SIGMOD | 0.00010421046 |
| 2,468 | On the Enumeration Complexity of Unions of Conjunctive Queries | 2019 | PODS | 8.5358494e-05 |
| 2,745 | Optimal Algorithms for Ranked Enumeration of Answers to Full Conjunctive Queries | 2020 | VLDB | 8.1747954e-05 |
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