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Author

Qichen Wang

Nanyang Technological University

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Review Aug 2026

Instance-Optimal Acyclic Joins: From Theory to Systems

This tutorial revisits Yannakakis algorithm (YA) as a central example of how database theory can guide practical query processing and discusses how these ideas extend to query optimization and general queries beyond the multi-way joins.

Paraschos Koutris, Stijn Vansummeren, Qichen Wang et al. · 0 citations
Preprint Aug 2026

Rerootable Hypertree Decompositions

This paper presents the first in-depth discussion of rerootability in hypertree decompositions, and defines a relaxed notion of normal form which leads to a truly rerootable and tractable class.

Zhe-Kai Jiang, Christoph Koch, Peter Lindner et al. · 0 citations

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