IMPORTANT: Please note, that we detected a bug the implementation used for bechmarking, affecting BSBM query 5. Unfortunately, a filter condition was wrongly set, resulting in an extremly short execution time. The version released here has this bug fixed. However, when comparing the performance of the flat structure SQL created by SparqlMap to the nested original BSBM-SQL, it still performs better by a factor of 2. So, except for the factor, all statements remain true.