Immutably Answering Why-Not Questions for Equivalent Conjunctive Queries

  title={Immutably Answering Why-Not Questions for Equivalent Conjunctive Queries},
  author={Nicole Bidoit and Melanie Herschel and Katerina Tzompanaki},
  journal={Ing{\'e}nierie des Syst{\`e}mes d'Information},
Answering Why-Not questions consists in explaining to developers of complex data transformations or manipulations why their data transformation did not produce 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 developers… CONTINUE READING
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