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Solving Similarity Joins and Range Queries in Metric Spaces with the List of Twin Clusters (2008)
| Citations: | 2 - 0 self |
BibTeX
@MISC{Paredes08solvingsimilarity,
author = {Rodrigo Paredes and Nora Reyes},
title = {Solving Similarity Joins and Range Queries in Metric Spaces with the List of Twin Clusters },
year = {2008}
}
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Abstract
The metric space model abstracts many proximity or similarity problems, where the most frequently considered primitives are range and k-nearest neighbor search, leaving out the similarity join, an extremely important primitive. In fact, despite the great attention that this primitive has received in traditional and even multidimensional databases, little has been done for general metric databases. We solve two variants of the similarity join problem: (1) range joins: Given two sets of objects and a distance threshold r, find all the object pairs (one from each set) at distance at most r; and (2) k-closest pair joins: Find the k closest object pairs (one from each set). For this sake, we devise a new metric index, coined List of Twin Clusters (LTC), which indexes both sets jointly, instead of the natural approach of indexing one or both sets independently. Finally, we show how to use the LTC in order to solve classical range queries. Our results show significant speedups over the basic quadratic-time naive alternative for both join variants, and that the LTC is competitive with the original list of clusters when solving range queries. Furthermore, we show that our technique has a great potential for improvements.
Keyphrases
range query twin cluster similarity join metric space object pair general metric database great attention important primitive k-closest pair basic quadratic-time naive alternative similarity problem new metric index significant speedup distance threshold join variant similarity join problem k-nearest neighbor search natural approach multidimensional database original list great potential metric space model classical range query many proximity
