Imagine merging thousands or millions of records into disparate timelines by various attributes, merging similar records, or overwriting, changing lengths... T

Imagine merging thousands or millions of records into disparate timelines by various attributes, merging similar records, or overwriting, changing lengths... This is the sort of stuff that filter/map/reduce is really really good at, but also, it can be important code that people will pay you a lot of money to write over a longer period of time....