Huanchen Zhang

ScaleDoc: Scaling LLM-based Predicates over Large Document Collections
Hengrui Zhang, Yulong Hui, Yihao Liu, and Huanchen Zhang
Proceedings of the ACM on Management of Data (SIGMOD'26), 4(3): Article 229, 26 pages.

Interact-RAG: Reason and Interact with the Corpus, Beyond Black-Box Retrieval
Yulong Hui, Chao Chen, Zhihang Fu, Yihao Liu, Jieping Ye, and Huanchen Zhang
Proceedings of the 14th International Conference on Learning Representations (ICLR'26), April 2026.

OkraLong: A Flexible Retrieval-Augmented Framework for Long-Text Query Processing
Yulong Hui, Yihao Liu, Yao Lu, and Huanchen Zhang
Empirical Methods in Natural Language Processing (EMNLP'25), November 2025.

UDA: A Benchmark Suite for Retrieval Augmented Generation in Real-world Document Analysis
Yulong Hui, Yao Lu, and Huanchen Zhang
Proceedings of the Thirty-Eighth Annual Conference on Neural Information Processing (NeurIPS'24), December 2024. CODE

Robust Predicate Transfer with Dynamic Execution
Yiming Qiao, Peter Boncz, and Huanchen Zhang
Proceedings of the VLDB Endowment (VLDB'26), 19(6), pp. 1278-1290.

Workload-Aware Incremental Reclustering in Cloud Data Warehouses
Yipeng Liu, Renfei Zhou, Jiaqi Yan, and Huanchen Zhang
Proceedings of the ACM on Management of Data (SIGMOD'26), 4(3): Article 250, 27 pages.

ScaleDoc: Scaling LLM-based Predicates over Large Document Collections
Hengrui Zhang, Yulong Hui, Yihao Liu, and Huanchen Zhang
Proceedings of the ACM on Management of Data (SIGMOD'26), 4(3): Article 229, 26 pages.

Automated Discovery of Test Oracles for Database Management Systems Using LLMs
Qiuyang Mang, Runyuan He, Suyang Zhong, Xiaoxuan Liu, Huanchen Zhang, and Alvin Cheung
Proceedings of the ACM on Management of Data (SIGMOD'26), 4(3): Article 140, 28 pages.

L3: A GPU-Native Co-Designed Data Format for Learned Lossless Lightweight Compression
Youyang Xia, Feng Zhang, Junda Pan, Yihao Liu, Jiawei Guan, Huanchen Zhang, and Xiaoyong Du
Proceedings of the ACM on Management of Data (SIGMOD'26), 4(3): Article 201, 27 pages.

ByteHouse: ByteDance's Cloud-Native Data Warehouse for Real-Time Multimodal Data Analytics
Yuxing Han, Yu Lin, Yifeng Dong, Xuanhe Zhou, Xindong Peng, Xinhui Tian, Zhiyuan You, Yingzhong Guo, Xi Chen,
Weiping Qu, Tao Meng, Dayue Gao, Haoyu Wang, Liuxi Wei, Huanchen Zhang, and Fan Wu
Proceedings of the ACM on Management of Data (SIGMOD'26), To Appear.

Aeris Filter: A Strongly and Monotonically Adaptive Range Filter
Yuvaraj Chesetti, Navid Eslami, Huanchen Zhang, Niv Dayan, and Prashant Pandey
Proceedings of the ACM on Management of Data (SIGMOD'26), 4(1): Article 7, 26 pages.

Improving Range Scan Performance in LSM-trees with Group Caching
Hengrui Wang, Jiaoyi Zhang, Jiansheng Qiu, Fangzhou Yuan, and Huanchen Zhang
Proceedings of the ACM on Management of Data (SIGMOD'26), 4(1): Article 47, 26 pages.

F3: The Open-Source Data File Format for the Future
Best Paper Award (Honorable Mention)
Xinyu Zeng, Ruijun Meng, Martin Prammer, Wes McKinney, Jignesh M. Patel, Andrew Pavlo, and Huanchen Zhang
Proceedings of the ACM on Management of Data (SIGMOD'26), 3(4): Article 245, 27 pages. CODE

Interact-RAG: Reason and Interact with the Corpus, Beyond Black-Box Retrieval
Yulong Hui, Chao Chen, Zhihang Fu, Yihao Liu, Jieping Ye, and Huanchen Zhang
Proceedings of the 14th International Conference on Learning Representations (ICLR'26), April 2026.

SHMemora: Protective Key-Value Store on Distributed Shared Memory
Jiajun Luo, Siyu Lin, Yunpeng Xu, Shengwei Liu, Jin Xia, Dong Liu, Zheng Liu, Huanchen Zhang, Teng Ma, and Shuwen Deng
Proceedings of the 42nd IEEE International Conference on Data Engineering (ICDE'26), To Appear.

Enabling Tile-Based Direct Query on Adaptively Compressed Data With GPU Acceleration
Yu Zhang, Feng Zhang, Yani Liu, Huanchen Zhang, Jidong Zhai, Wenchao Zhou, and Xiaoyong Du
IEEE Transactions on Parallel and Distributed Systems (TPDS'26), Feb. 2026, vol. 37, pp. 410-426.

Declarative Memory Services
Jeronimo Castrillon, Jana Giceva, Yu Hua, Kimberly Keeton, Akhil Shekar, Kevin Skadron, Tianzheng Wang, and Huanchen Zhang
Proceedings of the 2026 Conference on Innovative Data Systems Research (CIDR'26), January 2026.

OkraLong: A Flexible Retrieval-Augmented Framework for Long-Text Query Processing
Yulong Hui, Yihao Liu, Yao Lu, and Huanchen Zhang
Empirical Methods in Natural Language Processing (EMNLP'25), November 2025.

Selective Late Materialization in Modern Analytical Databases
Yihao Liu, Shaoxuan Tang, Yulong Hui, Hangrui Zhou, and Huanchen Zhang
Proceedings of the VLDB Endowment (VLDB'25), 18(11), pp. 4616-4628.

Concurrency Control as a Service
Weixing Zhou, Yanfeng Zhang, Xinji Zhou, Zhiyou Wang, Zeshun Peng, Yang Ren, Sihao Li,
Huanchen Zhang, Guoliang Li, and Ge Yu
Proceedings of the VLDB Endowment (VLDB'25), 18(9), pp. 2761-2774.

GORAM: Graph-oriented ORAM for Efficient Ego-centric Queries on Federated Graphs
Xiaoyu Fan, Kun Chen, Jiping Yu, Xiaowei Zhu, Yunyi Chen, Huanchen Zhang, and Wei Xu
Proceedings of the VLDB Endowment (VLDB'25), 18(10), pp. 3601-3614.

Accordion: Balancing Performance and Cost in Cloud-Native Data Analysis with Intra-Query Runtime Elasticity
Xukang Zhang, Huanchen Zhang, and Xiaofeng Meng
Proceedings of the VLDB Endowment (VLDB'25 Demo), 18(12), pp. 5307-5310.

HotRAP: Hot Record Retention and Promotion for LSM-trees with Tiered Storage
Jiansheng Qiu, Fangzhou Yuan, Mingyu Gao, and Huanchen Zhang
Proceedings of the 2025 USENIX Annual Technical Conference (ATC'25), pp. 497-511.

TwinStore: Secure Key-Value Stores Made Faster with Hybrid Trusted/Untrusted Storage
Xiang Li, Huanchen Zhang, and Mingyu Gao
Proceedings of the 16th International Symposium on Advanced Parallel Processing Technologies (APPT'25), pp. 321-336.

PUSHtap: PIM-based In-Memory HTAP with Unified Data Storage Format
Yilong Zhao, Mingyu Gao, Huanchen Zhang, Fangxin Liu, Gongye Chen, He Xian, Haibing Guan, and Li Jiang
Proceedings of the 30th ACM International Conference on Architectural Support for Programming Languages
and Operating Systems (ASPLOS'25), Volume 3, pp. 179-194.

Debunking the Myth of Join Ordering: Toward Robust SQL Analytics
Junyi Zhao, Kai Su, Yifei Yang, Xiangyao Yu, Paraschos Koutris, and Huanchen Zhang
Proceedings of the ACM on Management of Data (SIGMOD'25), 3(3): Article 146, 28 pages. CODE SLIDES

Rethinking The Compaction Policies in LSM-trees
Hengrui Wang, Jiansheng Qiu, Fangzhou Yuan, and Huanchen Zhang
Proceedings of the ACM on Management of Data (SIGMOD'25), 3(3): Article 207, 26 pages.

Intra-Query Runtime Elasticity for Cloud-Native Data Analysis
Xukang Zhang, Huanchen Zhang, and Xiaofeng Meng
Proceedings of the ACM on Management of Data (SIGMOD'25), 3(3): Article 178, 28 pages.

Femur: A Flexible Framework for Fast and Secure Querying from Public Key-Value Store
Jiaoyi Zhang, Liqiang Peng, Mo Sha, Weiran Liu, Xiang Li, Sheng Wang, Feifei Li, Mingyu Gao, and Huanchen Zhang
Proceedings of the ACM on Management of Data (SIGMOD'25), 3(3): Article 162, 29 pages.

Data Chunk Compaction in Vectorized Execution
Yiming Qiao and Huanchen Zhang
Proceedings of the ACM on Management of Data (SIGMOD'25), 3(1): Article 26, 25 pages.

ANSMET: Approximate Nearest Neighbor Search with Near-Memory Processing and Hybrid Early Termination
Yiwei Li, Yuxin Jin, Boyu Tian, Huanchen Zhang, and Mingyu Gao
Proceedings of the 52nd Annual International Symposium on Computer Architecture (ISCA'25), June 2025, pp. 1093 - 1107

ReaLHF: Optimized RLHF Training for Large Language Models through Parameter Reallocation
Zhiyu Mei, Wei Fu, Kaiwei Li, Guangju Wang, Huanchen Zhang, and Yi Wu
Proceedings of the Eighth Conference on Machine Learning and Systems (MLSys'25), May 2025. CODE

Towards Functional Decomposition of Storage Formats
Martin Prammer, Xinyu Zeng, Ruijun Meng, Wes McKinney, Huanchen Zhang, Andrew Pavlo, and Jignesh M. Patel
Proceedings of the 2025 Conference on Innovative Data Systems Research (CIDR'25), January 2025.

UDA: A Benchmark Suite for Retrieval Augmented Generation in Real-world Document Analysis
Yulong Hui, Yao Lu, and Huanchen Zhang
Proceedings of the Thirty-Eighth Annual Conference on Neural Information Processing (NeurIPS'24), December 2024. CODE

Cloud-Native Databases: A Survey
Haowen Dong, Chao Zhang, Guoliang Li, and Huanchen Zhang
IEEE Transactions on Knowledge and Data Engineering (TKDE'24), 36(12), pp. 7772-7791.

Blitzcrank: Fast Semantic Compression for In-memory Online Transaction Processing
Yiming Qiao, Yihan Gao, and Huanchen Zhang
Proceedings of the VLDB Endowment (VLDB'24), 17(10), pp. 2528-2540. CODE

An Empirical Evaluation of Columnar Storage Formats
Xinyu Zeng, Yulong Hui, Jiahong Shen, Andrew Pavlo, Wes McKinney, and Huanchen Zhang
Proceedings of the VLDB Endowment (VLDB'24), 17(2), pp. 148-161. CODE

NULLS!: Revisiting Null Representation in Modern Columnar Formats
Xinyu Zeng, Ruijun Meng, Andrew Pavlo, Wes McKinney, and Huanchen Zhang
Proceedings of the 20th International Workshop on Data Management on New Hardware (DaMoN'24), June 2024. CODE

Making In-Memory Learned Indexes Efficient on Disk
Jiaoyi Zhang, Kai Su, and Huanchen Zhang
Proceedings of the ACM on Management of Data (SIGMOD'24), 2(3): Article 151, 26 pages. CODE

GRF: A Global Range Filter for LSM-Trees with Shape Encoding
Hengrui Wang, Te Guo, Junzhao Yang, and Huanchen Zhang
Proceedings of the ACM on Management of Data (SIGMOD'24), 2(3): Article 141, 27 pages.

PimPam: Efficient Graph Pattern Matching on Real Processing-in-Memory Hardware
Shuangyu Cai, Boyu Tian, Huanchen Zhang, Mingyu Gao
Proceedings of the ACM on Management of Data (SIGMOD'24), 2(3): Article 161, 25 pages.

LeCo: Lightweight Compression via Learning Serial Correlations
Yihao Liu, Xinyu Zeng, and Huanchen Zhang
Proceedings of the ACM on Management of Data (SIGMOD'24), 2(1): Article 65, 28 pages. CODE

SALI: A Scalable Adaptive Learned Index Framework based on Probability Models
Jiake Ge, Huanchen Zhang, Boyu Shi, Yuanhui Luo, Yunda Guo, Yunpeng Chai, Yuxing Chen, and Anqun Pan
Proceedings of the ACM on Management of Data (SIGMOD'24), 1(4): Article 258, 25 pages.

Beyond Bloom: A Tutorial on Future Feature-Rich Filters
Prashant Pandey, Martín Farach-Colton, Niv Dayan, and Huanchen Zhang
Proceedings of the ACM on Management of Data (SIGMOD'24) Tutorial, June 2024.

Cost-Intelligent Data Analytics in the Cloud
Huanchen Zhang, Yihao Liu, Jiaqi Yan
Proceedings of the 2024 Conference on Innovative Data Systems Research (CIDR'24), January 2024. SLIDES

SRL: Scaling Distributed Reinforcement Learning to Over Ten Thousand Cores
Zhiyu Mei, Wei Fu, Guangju Wang, Huanchen Zhang, and Yi Wu
Proceedings of the Twelfth International Conference on Learning Representations (ICLR'24), May 2024. CODE

AdaCom: Adaptive Compression For Databases
Leon Windheuser, Christoph Anneser, Huanchen Zhang, Thomas Neumann, and Alfons Kemper
Proceedings of the 27th International Conference on Extending Database Technology (EDBT'24), March 2024.

G-Learned Index: Enabling Efficient Learned Index on GPU
Jiesong Liu, Feng Zhang, Lv Lu, Chang Qi, Xiaoguang Guo, Dong Deng, Guoliang Li, Huanchen Zhang, Jidong Zhai,
Hechen Zhang, Yuxing Chen, Anqun Pan, Xiaoyong Du
IEEE Transactions on Parallel and Distributed Systems (TPDS'24), 35(6), pp. 795-812.

Compressed Data Direct Computing for Databases
Weitao Wan, Feng Zhang Zhang, Chenyang Zhang, Mingde Zhang, Jidong Zhai, Yunpeng Chai, Huanchen Zhang, Wei Lu,
Yuxing Chen, Haixiang Li, Anqun Pan, and Xiaoyong Du
IEEE Transactions on Knowledge and Data Engineering (TKDE'23), 36(5), pp. 1902-1918.

Efficient Query Re-optimization with Judicious Subquery Selections
Junyi Zhao, Huanchen Zhang, and Yihan Gao
Proceedings of the ACM on Management of Data (SIGMOD'23), 1(2), pp. 1-26. CODE

When Tree Meets Hash: Reducing Random Reads for Index Structures on Persistent Memories
Ke Wang, Guanqun Yang, YiWei Li, Huanchen Zhang, and Mingyu Gao
Proceedings of the ACM on Management of Data (SIGMOD'23), 1(1), pp. 1-26. CODE

CompressGraph: Efficient Parallel Graph Analytics with Rule-Based Compression
Zheng Chen, Feng Zhang, JiaWei Guan, Jidong Zhai, Xipeng Shen, Huanchen Zhang, Wentong Shu, and Xiaoyong Du
Proceedings of the ACM on Management of Data (SIGMOD'23), 1(1), pp. 1-31.

Blink-hash: An Adaptive Hybrid Index for In-Memory Time-Series Databases
Hokeun Cha, Xiangpeng Hao, Tianzheng Wang, Huanchen Zhang, Aditya Akella, and Xiangyao Yu
Proceedings of the VLDB Endowment (VLDB'23), 16(6), pp. 1235-1248. CODE

REncoder: A Space-Time Efficient Range Filter with Local Encoder
Wang, Ziwei, Zheng Zhong, Jiarui Guo, Yuhan Wu, Haoyu Li, Tong Yang, Yaofeng Tu, Huanchen Zhang, and Bin Cui
Proceedings of the 39th IEEE International Conference on Data Engineering (ICDE'23). CODE

Adaptive Hybrid Indexes
Christoph Anneser, Andreas Kipf, Huanchen Zhang, Thomas Neumann, and Alfons Kemper
Proceedings of the 2022 International Conference on Management of Data (SIGMOD'22), June 2022, pp. 1626-1639.

Proteus: A Self-Designing Range Filter
Eric R. Knorr, Baptiste Lemaire, Andrew Lim, Siqiang Luo, Huanchen Zhang, Stratos Idreos, Michael Mitzenmacher
Proceedings of the 2022 International Conference on Management of Data (SIGMOD'22), June 2022, pp. 1670-1684. CODE

Succinct Range Filters
Huanchen Zhang, Hyeontaek Lim, Viktor Leis, David G. Andersen, Michael Kaminsky, Kimberly Keeton, and Andrew Pavlo
Communications of the ACM (CACM). 4 (April 2021): 166-173.

Everything is a Transaction: Unifying Logical Concurrency Control and Physical Data Structure Maintenance in
Database Management Systems
Ling Zhang, Matthew Butrovich, Tianyu Li, Yash Nannapanei, Andrew Pavlo, John Rollinson, Huanchen Zhang
Proceedings of the Conference on Innovative Data Systems Research (CIDR'21), Jan. 2021.

Memory-Efficient Search Trees for Database Management Systems
2021 SIGMOD Jim Gray Dissertation Award
Ph.D. Dissertation, February 2020 SLIDES VIDEO

Order-Preserving Key Compression for In-Memory Search Trees
Huanchen Zhang, Lily Liu, David G. Andersen, Michael Kaminsky, Kimberly Keeton, and Andrew Pavlo
Proceedings of the 2020 International Conference on Management of Data (SIGMOD'20), June 2020.
ARXIV CODE SLIDES VIDEO

Succinct Range Filters
Huanchen Zhang, Hyeontaek Lim, Viktor Leis, David G. Andersen, Michael Kaminsky, Kimberly Keeton, and Andrew Pavlo
ACM Transactions on Database Systems (TODS). 45.2 (2020): 1-31.

Succinct Range Filters
Huanchen Zhang, Hyeontaek Lim, Viktor Leis, David G. Andersen, Michael Kaminsky, Kimberly Keeton, and Andrew Pavlo
ACM SIGMOD Record. 48.1 (2019): 78-85.

SuRF: Practical Range Query Filtering with Fast Succinct Tries
Best Paper Award
Huanchen Zhang, Hyeontaek Lim, Viktor Leis, David G. Andersen, Michael Kaminsky, Kimberly Keeton, and Andrew Pavlo
Proceedings of the 2018 International Conference on Management of Data (SIGMOD'18), June 2018, pp. 323–336.
CODE DEMO SLIDES VIDEO

Building a Bw-Tree Takes More Than Just Buzz Words.
Ziqi Wang, Andrew Pavlo, Hyeontaek Lim, Viktor Leis, Huanchen Zhang, Michael Kaminsky, and David G. Andersen
Proceedings of the 2018 International Conference on Management of Data (SIGMOD'18), June 2018, pp. 473-488. CODE

Reducing the Storage Overhead of Main-Memory OLTP Databases with Hybrid Indexes
Huanchen Zhang, David G. Andersen, Andrew Pavlo, Michael Kaminsky, Lin Ma, and Rui Shen
Proceedings of the 2016 International Conference on Management of Data (SIGMOD'16), June 2016, pp. 1567–1581. SLIDES