VADA: an architecture for end user informed data preparation. - Nikolaos Konstantinou 001; Edward Abel; Luigi Bellomarini; Alex Bogatu; Cristina Civili; Endri Irfanie; Martin Koehler; Lacramioara Mazilu; Emanuel Sallinger; Alvaro A. A. Fernandes; Georg Gottlob; John A. Keane; et al. (J. Big Data, 2019)