Sub-problems: #rows>>#cols, column correlation, column characteristics  column-wise compression w/ heterogeneous encoding formats Time Prog- ress Structure of Scientific Papers 18 706.015 Introduction to 2021  #8.2 Manos Karpathiotakis, Ioannis Alagiannis, Anastasia Ailamaki: Fast Queries Over Heterogeneous Data Through Engine Customization. PVLDB 9(12) 2016  #8.3 Ioannis Alagiannis, Renata Borovica