Ziqi WANG | Homepage

I am a Ph.D. candidate in the Websoft Research Group at the School of Computer Science, Nanjing University, advised by Prof. Wei Hu. My research focuses on modern database systems, especially high-dimensional vector querying and multimodal data retrieval in vector database.

News

2026-09 — Paper accepted at SIGMOD 2027.
2026-08 — One Chinese paper was accepted at NDBC 2026, see you in Shanghai!
2026-07 — Supported by Postgraduate Research & Practice Innovation Program of Jiangsu Province
2026-05 — Received SIGMOD Travel Grant, see you in Bengaluru!
2025-12 — Received Outstanding Graduate Student Award.
2025-11 — Received National Scholarship for Graduate Students.

Older news

2025-08 — Paper accepted at SIGMOD 2026.
2025-07 — About to attend Database Summer School in Tianjin, see you there!
2024-10 — Received President's Special Scholarship for Doctoral Students.
2024-09 — Started my Ph.D. journey at Nanjing University.
2024-07 — About to attend Database Summer School in Harbin, see you there!

Education

Ph.D. in Computer Science	2024.09 - 2029.06 (expected) \| Nanjing University, Nanjing, China
B.S. in Computer Science	2020.09 - 2024.06 \| Nanjing University, Nanjing, China

Publications

Conference Papers

Fast Label-Filtering Approximate Nearest Neighbor Search via Progressive Label Set Stratification

Ziqi Wang, Jingzhe Zhang, Shuo Shen and Wei Hu

SIGMOD 2027 · Proceedings of the ACM on Management of Data.

[Paper] [Code] [Slides] [Poster]

WoW: A Window-to-Window Incremental Index for Range-Filtering Approximate Nearest Neighbor Search

Ziqi Wang, Jingzhe Zhang, and Wei Hu

SIGMOD 2026 · Proceedings of the ACM on Management of Data, 3(6), Article 378.

[Paper] [Code] [Slides] [Poster]

Efficient Index for Category Filtering Approximate Nearest Neighbor Search

Ziqi Wang, Jingzhe Zhang, and Wei Hu

NDBC 2026 · CCF National Database Conference.

[Paper] [Poster]

Journal Papers

A Raster-Based Typification Method for Multiscale Visualization of Building Features Considering Distribution Patterns

Yilang Shen, Jingzhong Li, Ziqi Wang, Rong Zhao, and Lu Wang

International Journal of Digital Earth, 2022, 15(1), 249-275.

[Paper]

Projects

NJUDB: A relational database for undergraduates

Covers storage, indexing, query processing and optimization, transaction management and concurrency control. The project is designed to provide a comprehensive learning experience in database systems for undergraduates.

[Project Page] [Code]

LSSGLib & WoWLib: Efficient indexes for filtered vector search

Header-only C++ libraries for label and range filtering vector search, with theoretical guarantees, incremental updates, and efficient query processing across different filter semantics and selectivities. Includes Python bindings and SIMD support.

[LSSGLib] [WoWLib]

Awards

SIGMOD Student Travel Grant 2026 · ACM

National Scholarship for Graduate Students 2025 · Ministry of Education of China

Outstanding Graduate Student 2024 · Nanjing University

President's Special Scholarship for Doctoral Students 2024 · Nanjing University

Outstanding Graduate 2024 · Nanjing University

Outstanding Undergraduate Student 2024 · Nanjing University

Meritorious Winner, Mathematical Contest in Modeling (MCM) 2024 · COMAP, USA

Renming Scholarship 2022, 2023, 2024 · Nanjing University

Work Experience

Edge-device knowledge graph & vector retrieval

2026.06 - now | Research Intern, OPPO

Teaching

Teaching Assistant, Introduction to Databases	Fall 2025 \| Nanjing University
Teaching Assistant, Introduction to Databases	Fall 2024 \| Nanjing University