“…The problem of managing queries in distributed scenarios has been extensively studied, but traditional solutions (e.g., [19,21]) as well as modern approaches that consider big data analytics (e.g., [2,4,25]) do not take into consideration access restrictions. In the relational database context, access restrictions can be supported by views (e.g., [9,17,26]), access patterns (e.g., [3,6]), or data masking (e.g., [20]).…”