Journals

Daichi Amagata and Duhyun Kim Static and Streaming Algorithms for Random Sampling over Spatial Range Joins The VLDB Journal, volume 35, issue 5, article 44, 2026. Extended version of ICDE2025. Code is here.
Panagiotis Simatis, Panagiotis Bouros, Daichi Amagata, Konstantinos Tsakalidis, and Nikos Mamoulis AITTI: Augmented Interval Tree for Temporal Indexing Proceedings of the ACM on Management of Data, volume 4, number 4, article 255, 2026. To be presented at SIGMOD2027. Preprint is here. Code is here.
Jimin Lee and Daichi Amagata Efficient Algorithms for Top-k Range Search on Weighted Interval Data GeoInformatica, volume 30, article number 18, 2026. Extended version of SSTD2025 (invited from SSTD2025 as best selection).
Daichi Amagata, Panagiotis Simatis, Panagiotis Bouros, and Nikos Mamoulis FIRAS: A Framework for Interval Range Search and Sampling Proceedings of the ACM on Management of Data, volume 4, number 3, article 185, 2026. Presented at SIGMOD2026. The first two authors contributed to this work equally. Preprint is here. Code is here. Slide is here. Poster is here.
Genryu Kuraya, Konstantinos Skitsas, Davide Mottin, Panagiotis Karras, Daichi Amagata, and Yuya Sasaki Sublime: Selecting Subgraph Matching Algorithms via Machine Learning Proceedings of the ACM on Management of Data, volume 4, number 3, article 238, 2026. Presented at SIGMOD2026. Code is here.

Conferences

Naoya Ehara and Daichi Amagata Time Duration-constrained Spatial Range Search Proceedings of the 5th ACM SIGSPATIAL International Workshop on Searching and Mining Large Collections of Geospatial Data (GeoSearch 2026), pages xx-xx, 2026.
Reon Uemura, Keito Kido, and Daichi Amagata Simple and Fast Algorithm for Graph-based Filtered Approximate Nearest Neighbor Search Proceedings of the International Conference on Similarity Search and Applications (SISAP), pages 36-42, 2026. Preprint is here.
Naoya Ehara and Daichi Amagata Duration-constrained Interval Joins Proceedings of the IEEE International Conference on Mobile Data Management, pages 12-22, 2026. arXiv version is here. Code is here.