Optimal join algorithms meet top-k

N Tziavelis, W Gatterbauer, M Riedewald - Proceedings of the 2020 …, 2020 - dl.acm.org
Top-k queries have been studied intensively in the database community and they are an
important means to reduce query cost when only the" best" or" most interesting" results are …

[HTML][HTML] Beyond equi-joins: Ranking, enumeration and factorization

N Tziavelis, W Gatterbauer… - Proceedings of the VLDB …, 2021 - ncbi.nlm.nih.gov
We study theta-joins in general and join predicates with conjunctions and disjunctions of
inequalities in particular, focusing on ranked enumeration where the answers are returned …

Toward Responsive DBMS: Optimal Join Algorithms, Enumeration, Factorization, Ranking, and Dynamic Programming

N Tziavelis, W Gatterbauer… - 2022 IEEE 38th …, 2022 - ieeexplore.ieee.org
When processing join queries over big data, a DBMS can become unresponsive, ie, it takes
very long until any output tuples appear. Ranked enumeration addresses this problem by …

Finding Linear Explanations for a Given Ranking

Z Chen, P Manolios, M Riedewald - arXiv preprint arXiv:2406.11797, 2024 - arxiv.org
Given a relation and a ranking of its tuples, but no information about the ranking function, we
propose RankExplain to solve 2 types of problems: SAT asks if any linear scoring function …

Efficient Ranked Access to Database Query Answers

N Tziavelis - 2024 - search.proquest.com
Database queries can produce a huge output that is infeasible to compute, regardless of the
algorithm or system that processes them. This can often occur when the query joins large …

Range Longest Increasing Subsequence and its Relatives: Beating Quadratic Barrier and Approaching Optimality

S Rahul - arXiv preprint arXiv:2404.04795, 2024 - arxiv.org
In this work, we present a plethora of results for the range longest increasing subsequence
problem (Range-LIS) and its variants. The input to Range-LIS is a sequence $\mathcal {S} …

Optimal Algorithms for Range Searching over Multi-Armed Bandits

S Barman, R Krishnamurthy, S Rahul - arXiv preprint arXiv:2105.01390, 2021 - arxiv.org
This paper studies a multi-armed bandit (MAB) version of the range-searching problem. In its
basic form, range searching considers as input a set of points (on the real line) and a …