Aggregate/Algebraic functions
Tuesday, March 01, 2011
9:08 AM
What is an aggregate (algebraic) function?
In principle, can write everything using Eval functions.
But this can incredibly inefficient when the thing to be acted upon is a large bag (e.g., generated by GROUP-BY).
Aggregate (algebraic) functions
Act on inner bags.
Expose full map/reduce capabilities. 