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cs.DB updates on arXiv.org

Block-Sphere Vector Quantization GroupAffect-4: A Multimodal Dataset of Four-Person Collaborative Interaction CogScale: Scalable Benchmark for Sequence Processing TextAlign: Preference Alignment for Text Rendering with Hierarchical Rewards LogRouter: Adaptive Two-Level LLM Routing for Log Question Answering in Big Data Systems Agentic Cost-Aware Query Planning with Knowledge Distillation for Big Data Analytics Covariance Structure and Coordinate Heterogeneity Govern Binary Quantization of Contrastive Embeddings IVF-TQ: Calibration-Free Streaming Vector Search via a Codebook-Free Residual Layer Automatic Unsupervised Ensemble Outlier Model Selection--Extended Version A Generative AI Framework for Intelligent Utility Billing CO 2 Analytics and Sustainable Resource Optimisation Towards Foundation Models for Relational Databases with Language Models and Graph Neural Networks Gaussian Relational Graph Transformer Croissant Baker: Metadata Generation for Discoverable, Governable, and Reusable ML Datasets Reducing Hallucination in Vision-Language Models via Stage-wise Preference Optimization under Distribution Shift A Horn extension of DL-Lite with NL data complexity 3D Primitives are a Spatial Language for VLMs Enabling AI-Native Mobility in 6G: A Real-World Dataset for Handover, Beam Management, and Timing Advance A CAP-like Trilemma for Large Language Models: Correctness, Non-bias, and Utility under Semantic Underdetermination EpiCastBench: Datasets and Benchmarks for Multivariate Epidemic Forecasting FERMI: Exploiting Relations for Membership Inference Against Tabular Diffusion Models Toward Multi-Database Query Reasoning for Text2Cypher Autonomous FAIR Digital Objects: From Passive Assertions to Active Knowledge HOME-KGQA: A Benchmark Dataset for Multimodal Knowledge Graph Question Answering on Household Daily Activities Detect, Localize, and Explain: Interactive Hierarchical Log Anomaly Analytics with LLM Augmentation Open Ontologies: Tool-Augmented Ontology Engineering with Stable Matching Alignment Machine Learning-Based Pre-Test Risk Stratification for PCR-Confirmed Chlamydia Using Patient-Reported Data and Urine Biomarkers Reconciling Consistency-Based Diagnosis with Actual-Causality-Based Explanations PrepBench: How Far Are We from Natural-Language-Driven Data Preparation? Anatomy of a Query: W5H Dimensions and FAR Patterns for Text-to-SQL Evaluation Building informative materials datasets beyond targeted objectives
Simpli-Squared: A Very Simple Yet Unexpectedly Powerful J...
Asoke Datta, Yesdaulet Izenov, Brian Tsan, Florin Rusu · 2021-10-30 · via cs.DB updates on arXiv.org

The Join Order Benchmark (JOB) has become the de facto standard to assess the performance of relational database query optimizers due to its complexity and completeness. In order to compute the optimal execution plan -- join order -- existing solutions employ extensive data synopses and correlations -- functional dependencies -- between table attributes. These structures incur significant overhead to design, build, and maintain. In this paper, we present \textit{Simpli}city \textit{Simpli}fied (\textit{Simpli-Squared}), a very simple join ordering algorithm that achieves unexpectedly good results. Simpli-Squared computes the join order without using any statistics or cardinality estimates. It takes as input only the referential integrity constraints declared at schema definition and the number of tuples (size) in the base tables. The join order of a given query is computed by splitting the join graph along the many-to-many joins and sorting the tables based on their size. The tables involved in one-to-many joins are greedily included based on size and the query join graph. The resulting plan can be efficiently generated by a lightweight query rewriting procedure. Experiments on the JOB benchmark in PostgreSQL show that Simpli-Squared achieves runtimes having an increase of only up to 16\% -- and sometimes even a reduction -- compared to four state-of-the-art solutions that are considerably more intricate. Based on these results, we question whether JOB adequately tests query optimizers or if accurate cardinality estimation is such a fundamental requirement for performing well on the JOB benchmark.