The first in a 3 part series of "DataFusion Architecture" presentations.
Part 1 covers what is a query engine and why might you need one and a brief introduction to DataFusion
https://arrow.apache.org/datafusion/
Slides: https://docs.google.com/presentation/d/1D3GDVas-8y0sA4c8EOgdCvEjVND4s2E7I6zfs67Y4j8/edit#slide=id.p