“…For the considered engine, it would be a step toward the paradigms of multi-level granular data analytics (Yao 2016). Yet another aspect refers to vertical data organization (Abadi et al 2013), which -in our case -means an independent access to collections of histograms, special values, gaps, cooccurrence ratios, etc. This way, for every query, we can grasp these components of stored data summaries that are required to execute particular operations.…”