Publications

You can also find my articles on my Google Scholar profile.

^* denotes equal contribution (co-first authors). My name is underlined.

1. Query Cost Model Calibration in Confidential Virtual Machines
   Qihan Zhang, Mengyuan Li, Ibrahim Sabek.
   Workshop on Secure and Private Data Management (SeQureDB 2026), co-located with SIGMOD/PODS 2026.
   [PDF]

2. Evaluating Intrinsic Geospatial Topological Reasoning in LLMs
   Shaolin Xie, Shang-Ling Hsu, Qihan Zhang, Yiming Gao, Cyrus Shahabi, Ibrahim Sabek.
   The 1st ACM SIGSPATIAL Int’l Workshop on Generative and Agentic AI for Multi-Modality Space-Time Intelligence (GeoGenAgent 2025), co-located with ACM SIGSPATIAL 2025.
   [PDF]

3. SEFRQO: A Self-Evolving Fine-Tuned RAG-Based Query Optimizer
   Hanwen Liu^*, Qihan Zhang^*, Ryan Marcus, Ibrahim Sabek.
   Proceedings of the ACM on Management of Data (PACMMOD), SIGMOD 2026.
   [PDF]

4. LIMAO: A Framework for Lifelong Modular Learned Query Optimization
   Qihan Zhang, Shaolin Xie, Ibrahim Sabek.
   Proceedings of the VLDB Endowment (VLDB 2025).
   [PDF]

5. SERAG: Self-Evolving RAG System for Query Optimization
   Hanwen Liu^*, Qihan Zhang^*, Ryan Marcus, Ibrahim Sabek.
   International Workshop on Exploiting Artificial Intelligence Techniques for Data Management (aiDM 2025), co-located with SIGMOD 2025.
   [PDF]