Author

Hai-Kai Zhao

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Preprint Nov 2026

PROBE: Learned Proxy-Based Execution for Highly Selective Multimodal Semantic Queries

Large language models (LLMs) enable semantic queries over unstructured data, but invoking an LLM on every row is prohibitively expensive. Proxy-based execution can reduce this ple with the LLM and training a lightweight proxyto label the remaining rows. Nevertheless, in practical scenarios where semantic queries are hi...

Hai-Kai Zhao, Hai-Sheng Fu, Zheng-Jie Miao et al. · 0 citations

[Experiments & Analysis] Understanding the Performance of Native Execution in Big Data Engines: The Good, the Bad, and How to Fix It

This paper systematically evaluates the performance across three different native vectorized execution engines, including C++ based Velox and ClickHouse, and Rust based DataFusion, for the widely used big data engine Apache Spark, and proposes a cost model driven operator placement strategy that adaptively schedules op...

Hai-Kai Zhao · 0 citations