What is meant by array-based system that he is referring to ? Can someone point me to some other basic literature that explains array-based database systems? C

What is meant by array-based system that he is referring to ? Can someone point me to some other basic literature that explains array-based database systems? Context from the interview: Sooner or later, the business intelligence world will move to the data science world, using things like regression analysis, Bayesian analysis — these are lots of big words, but all of these techniques, if you look at them, it’s an array-based, not a table-based calculation.