Runtime Query Rewriting Sample Clauses

Runtime Query Rewriting. (Lead FUB) In this task we develop the techniques for rewriting, at runtime, end-user queries into queries over the data sources. The rewriting consists of two separate but closely interacting phases the first one rewrites the end-user query taking into account the constraints in the ontology, while the second one rewrites the resulting query into a query over the data sources by exploiting the mapping layer. The objective is on the one hand to produce queries over the data sources that are optimized towards an efficient execution, and on the other hand to keep the rewriting process as simple and as efficient as possible. For both rewriting steps, the developed techniques will take into account data dependencies that hold in the system or that are derived from the mappings, and, more in general, the infrastructure developed in WP7. In particular, we aim at exploiting feedback from the query execution layer about query execution statistics to optimize the result of query rewriting. We will also take into account extensions of the query language as those considered in WP3, e.g., epistemic queries, queries with negation, comparisons, and aggregation.
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Related to Runtime Query Rewriting

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