Beyond databases, architectures and structures paving the road to smart data processing and analysis : 15th International Conference, BDAS 2019, Ustroń, Poland, May 28 - 31, 2019 : proceedings - Kozielski, Stanisław; Mrozek, Dariusz; Kasprowski, Paweł; Małysiak-Mrozek, Bozena; Kostrzewa, Daniel (Springer, 2019)