ExDRa: Exploratory Data Science on Federated Raw Data. - Sebastian Baunsgaard; Matthias Boehm 001; Ankit Chaudhary; Behrouz Derakhshan; Stefan Geißelsöder; Philipp M. Grulich; Michael Hildebrand; Kevin Innerebner; Volker Markl; Claus Neubauer; Sarah Osterburg; Olga Ovcharenko; et al. (SIGMOD Conference, 2021)