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Performance improvements - UGQL 1.1.0

Tim Holzheim requested to merge performance-improvements into master

By approving UGQL 1.1.0 UGQL is moving away from the data fetcher concept where each schema entity has its own fetcher. Since UGQL 1.0.0 and HyperGraphQL never fully supported this concept (Two query rounds 1. direct conversion of the query to SPARQL to fill the result-pool and 2. using data fetcher to query from this pool) moving away from it showed significant performance improvements. The results of the evaluation and performed changes can be found in the following document.pdf.

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