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Répondre à des requêtes Why-Not indépendamment de la représentation des requêtes

Nicole Bidoit 1, 2, 3, 4 Melanie Herschel 4, 3, 2, 1 Katerina Tzompanaki 4, 3, 2, 1
4 OAK - Database optimizations and architectures for complex large data
LRI - Laboratoire de Recherche en Informatique, UP11 - Université Paris-Sud - Paris 11, Inria Saclay - Ile de France, CNRS - Centre National de la Recherche Scientifique : UMR8623
Résumé : Answering Why-Not questions consists in explaining to developers of complex data transformations or manipulations why their data transformation did not pro-duce some specific results, although they expected them to do so. Different types of explanations that serve as Why-Not answers have been proposed in the past and are either based on the available data, the query tree, or both. Solutions (partially) based on the query tree are generally more efficient and easier to interpret by de-velopers than solutions solely based on data. However, algorithms producing such query-based explanations so far may return different results for reordered conjunc-tive query trees, and even worse, these results may be incomplete. Clearly, this represents a significant usability problem, as the explanations developers get may be partial and developers have to worry about the query tree representation of their query, losing the advantage of using a declarative query language. As remedy to this problem, we propose the Ted algorithm that produces the same complete query-based explanations for reordered conjunctive query trees.
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Contributor : Aikaterini Tzompanaki <>
Submitted on : Monday, December 15, 2014 - 4:37:16 PM
Last modification on : Tuesday, April 21, 2020 - 1:08:09 AM
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  • HAL Id : hal-01095491, version 1



Nicole Bidoit, Melanie Herschel, Katerina Tzompanaki. Répondre à des requêtes Why-Not indépendamment de la représentation des requêtes. Bases de données avancées (BDA14), Oct 2014, Autrans-Grenboble, France. ⟨hal-01095491⟩



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