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2005
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An incremental algorithm for computing ranked full disjunctions

9 years 9 months ago
An incremental algorithm for computing ranked full disjunctions
The full disjunction is a variation of the join operator that maximally combines tuples from connected relations, while preserving all information in the relations. The full disjunction can be seen as a natural extension of the binary outerjoin operator to an arbitrary number of relations and is a useful operator for information integration. This paper presents the algorithm IncrementalFD for computing the full disjunction of a set of relations. IncrementalFD improves upon previous algorithms for computing the full disjunction in three ways. First, it has a lower total runtime when computing the full result and a lower runtime when computing only k tuples of the result, for any constant k. Second, for a natural class of ranking functions, IncrementalFD returns tuples in ranking order. Third, IncrementalFD can be adapted to have a block-based execution, instead of a tuple-based execution.
Sara Cohen, Yehoshua Sagiv
Added 26 Jun 2010
Updated 26 Jun 2010
Type Conference
Year 2005
Where PODS
Authors Sara Cohen, Yehoshua Sagiv
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