Author

Gabriel Carmona

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Jul 2026

Extended Depth-First Representations of k2-trees

In this paper, we study static, computation-friendly, lossless compression formats for graphs, focusing on memory locality and operational efficiency of $k^2$-trees. We observe that their traditional level-wise layouts suffer from poor cache performance due to weak locality, especially in operations such as matrix-vect...

Gabriel Carmona, P. Ferragina, Giovanni Manzini et al. · arXiv.org · 0 citations

Speeding up Qdags with Generalized Hypertree Decompositions

This paper combines Qdags with a Generalized Hypertree Decomposition of the query, into subqueries with fewer variables, and implements algorithms that find the optimal GHD according to the AGM bounds of the subqueries and the specificities of the Qdag cost model.

Diego Arroyuelo, Gabriel Carmona, Gonzalo Navarro et al. · 0 citations