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Adopting Worst-Case Optimal Joins in Relational Database Systems

Summary: Presents a practical hash-based worst-case-optimal join requiring no prebuilt ordered indexes, suitable for general-purpose HTAP systems. A hybrid optimizer combines binary and multiway joins, delivering large gains on favorable queries without regressions otherwise. (summarized by gpt-5.6-luna on Jul 24 2026)

Paper ID
haca00b86f0787ef7
Venue
VLDB
Year
2020
Pagerank
0.00010122962
Overall Rank
1,596 | 89.28%
DOI
10.14778/3407790.3407797
PDF
Download (CC BY-NC-ND 4.0)

Incoming Non-self Citations Over Time

Authors

BibTeX Citation

@article{freitag_vldb20,
        title = {{Adopting Worst-Case Optimal Joins in Relational Database Systems}},
        author = {Freitag, Michael and Bandle, Maximilian and Schmidt, Tobias and Kemper, Alfons and Neumann, Thomas},
        journal = {PVLDB},
        series = {{VLDB} '20},
        volume = {13},
        number = {11},
        pages = {1891--1904},
        doi = {10.14778/3407790.3407797},
        url = {https://doi.org/10.14778/3407790.3407797},
        year = {2020}
}

Incoming Citations (Sorted by Pagerank)

Showing 35 of 35 citing papers.

Rank Citing Paper Year Venue Pagerank
1,753 Kuzu* Graph Database Management System 2023 CIDR 9.7244117e-05
3,058 The LDBC Social Network Benchmark: Business Intelligence Workload 2023 VLDB 7.6943418e-05
3,154 Robust Join Processing with Diamond Hardened Joins 2024 VLDB 7.5849549e-05
4,371 Predicate Transfer: Efficient Pre-Filtering on Multi-Join Queries 2024 CIDR 6.6284915e-05
4,607 Worst-Case Optimal Graph Joins in Almost No Space 2021 SIGMOD 6.501689e-05
4,945 Debunking the Myth of Join Ordering: Toward Robust SQL Analytics 2025 SIGMOD 6.3418058e-05
5,013 Free Join: Unifying Worst-Case Optimal and Traditional Joins 2023 SIGMOD 6.3119508e-05
5,444 Optimizing Tensor Programs on Flexible Storage 2023 SIGMOD 6.1250455e-05
5,454 High-Performance Row Pattern Recognition Using Joins 2023 VLDB 6.1225019e-05
5,895 Yannakakis+: Practical Acyclic Query Evaluation with Theoretical Guarantees 2025 SIGMOD 5.9534254e-05
6,811 Instance-Optimal Acyclic Join Processing Without Regret: Engineering the Yannakakis Algorithm in Column Stores 2025 VLDB 5.6754603e-05
7,080 DuckPGQ: Efficient Property Graph Queries in an analytical RDBMS 2023 CIDR 5.6026544e-05
7,372 ADOPT: Adaptively Optimizing Attribute Orders for Worst-Case Optimal Join Algorithms via Reinforcement Learning 2023 VLDB 5.5385404e-05
7,768 Adaptive Factorization Using Linear-Chained Hash Tables 2025 CIDR 5.4548741e-05
7,871 Building Advanced SQL Analytics From Low-Level Plan Operators 2021 SIGMOD 5.434014e-05
7,943 GraphINC: Graph Pattern Mining at Network Speed 2023 SIGMOD 5.4197795e-05
8,539 GRainDB: A Relational-core Graph-Relational DBMS 2022 CIDR 5.3193454e-05
9,368 Subgraph Matching: A New Decomposition Based Approach 2025 VLDB 5.1843659e-05
9,370 Extending SQL to Return a Subdatabase 2025 SIGMOD 5.1843659e-05
9,945 AvantGraph Query Processing Engine 2022 VLDB 5.1042556e-05
9,958 HoneyComb: A Parallel Worst-Case Optimal Join on Multicores 2025 SIGMOD 5.1014161e-05
10,107 Still Asking: How Good Are Query Optimizers, Really? 2025 VLDB 5.0765311e-05
10,276 GraphMatch: Subgraph Query Processing on Steroids 2026 SIGMOD 5.0461162e-05
10,308 Worst-Case-Optimal Similarity Joins on Graph Databases 2024 SIGMOD 5.0377711e-05
10,410 The Space-Time Complexity of Sum-Product Queries 2026 PODS 4.9769913e-05
10,778 One Join Order Does Not Fit All: Reducing Intermediate Results with Per-Split Query Plans 2026 VLDB 4.9769913e-05
10,812 BaCon: Efficient Batch Processing of Counting Queries 2026 VLDB 4.9769913e-05
10,842 ReSequel: Robust LLM-assisted Query Rewriting and Optimization using Templatization and Sampling 2026 VLDB 4.9769913e-05
10,852 The Data World Is Not Flat: Efficient Factorized Execution for Relational Systems 2026 VLDB 4.9769913e-05
10,863 Worst-Case Optimal BGPs on Temporal Graphs 2026 VLDB 4.9769913e-05
10,893 FlowLog: Efficient and Extensible Datalog via Incrementality 2026 VLDB 4.9769913e-05
11,189 Community Detection in Heterogeneous Information Networks Without Materialization 2025 SIGMOD 4.9769913e-05
11,212 cuMatch: A GPU-based Memory-Efficient Worst-case Optimal Join Processing Method for Subgraph Queries with Complex Patterns 2025 SIGMOD 4.9769913e-05
11,552 Towards a Converged Relational-Graph Optimization Framework 2024 SIGMOD 4.9769913e-05
11,990 Vertex-centric Parallel Computation of SQL Queries 2021 SIGMOD 4.9769913e-05
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Outgoing Citations (Sorted by Pagerank)

Showing 22 of 22 cited papers.

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

Rank Cited Paper Year Venue Pagerank
15 How Good Are Query Optimizers, Really? 2016 VLDB 0.00061067652
21 Efficiently Compiling Efficient Query Plans for Modern Hardware 2011 VLDB 0.00056835296
53 Eddies: Continuously Adaptive Query Processing 2000 SIGMOD 0.000408505
91 On the Propagation of Errors in the Size of Join Results 1991 SIGMOD 0.00034748721
208 EmptyHeaded: A Relational Engine for Graph Processing 2016 SIGMOD 0.00024899872
215 Morsel-Driven Parallelism: A NUMA-Aware Query Evaluation Framework for the Many-Core Age 2014 SIGMOD 0.00024589307
315 Worst-Case Optimal Join Algorithms: Techniques, Results, and Open Problems 2018 PODS 0.00021236408
357 FAQ: Questions Asked Frequently 2016 PODS 0.00020013731
373 Umbra: A Disk-Based System with In-Memory Performance 2020 CIDR 0.00019705706
466 Design and Implementation of the LogicBlox System 2015 SIGMOD 0.00017765702
713 Optimizing Subgraph Queries by Combining Binary and Worst-Case Optimal Joins 2019 VLDB 0.00014571507
1,252 Distributed Evaluation of Subgraph Queries Using Worst-case Optimal Low-Memory Dataflows 2018 VLDB 0.00011334813
1,292 From Theory to Practice: Efficient Join Query Evaluation in a Parallel Database System 2015 SIGMOD 0.00011147959
1,570 AJAR: Aggregations and Joins over Annotated Relations 2016 PODS 0.0001020376
1,726 Beyond Worst-case Analysis for Joins with Minesweeper 2014 PODS 9.7857214e-05
1,801 Hash joins and hash teams in Microsoft SQL Server 1998 VLDB 9.604827e-05
1,813 Joins via Geometric Resolutions: Worst-case and Beyond 2015 PODS 9.5759542e-05
2,302 On Functional Aggregate Queries with Additive Inequalities 2019 PODS 8.6687541e-05
2,932 Efficient Multi-way Theta-Join Processing Using MapReduce 2012 VLDB 7.8368679e-05
3,132 Every Row Counts: Combining Sketches and Sampling for Accurate Group-By Result Estimates 2019 CIDR 7.6107287e-05
5,532 Generalized Hash Teams for Join and Group-by 1999 VLDB 6.0906796e-05
6,216 Data Partitioning for In-Memory Systems: Myths, Challenges, and Opportunities 2019 CIDR 5.8451996e-05
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