Beyond Equi-joins: Ranking, Enumeration and Factorization
Nikolaos Tziavelis,
Wolfgang Gatterbauer,
Mirek Riedewald
Abstract:We study full acyclic join queries with general join predicates that involve conjunctions and disjunctions of inequalities, focusing on ranked enumeration where the answers are returned incrementally in an order dictated by a given ranking function. Our approach offers strong time and space complexity guarantees in the standard RAM model of computation, getting surprisingly close to those of equi-joins. With π denoting the number of tuples in the database, we guarantee that for every value of π, the π top-r… Show more
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