5 papers
From FPT Decision to FPT Enumeration
Nadia Creignou, Timo Camillo Merkl, Reinhard Pichler +1
Fixed-parameter tractable (FPT) algorithms have been successfully applied to many intractable problems -- with a focus on decision and optimization problems. Their aim is to confin…
The Space-Time Complexity of Sum-Product Queries
Kyle Deeds, Timo Camillo Merkl, Reinhard Pichler +1
While extensive research on query evaluation has achieved consistent improvements in the time complexity of algorithms, the space complexity of query evaluation has been largely ig…
Query Answering under Volume-Based Diversity Functions
Marcelo Arenas, Timo Camillo Merkl, Reinhard Pichler +1
When query evaluation produces too many tuples, a new approach in query answering is to retrieve a diverse subset of them. The standard approach for measuring the diversity of a se…
Diversity of Answers to Conjunctive Queries
Timo Camillo Merkl, Reinhard Pichler, Sebastian Skritek
Enumeration problems aim at outputting, without repetition, the set of solutions to a given problem instance. However, outputting the entire solution set may be prohibitively expen…
Partition Constraints for Conjunctive Queries: Bounds and Worst-Case Optimal Joins
Kyle Deeds, Timo Camillo Merkl
In the last decade, various works have used statistics on relations to improve both the theory and practice of conjunctive query execution. Starting with the AGM bound which took a…