It is the same concept with other FP API, you could learn it from Scala collection map and flatmap
http://www.brunton-spall.co.uk/post/2011/12/02/map-map-and-flatmap-in-scala/ Spark doc: *map*(*func*) Return a new distributed dataset formed by passing each element of the source through a function *func*. *flatMap*(*func*) Similar to map, but each input item can be mapped to 0 or more output items (so *func* should return a Seq rather than a single item). On Wed, Mar 12, 2014 at 7:50 PM, goi cto <goi....@gmail.com> wrote: > Hi, > > Can someone explain to me the difference between map and flatMap and what > is a good use case for each? > > -- > Eran | CTO > -- ~Yours, Xuefeng Wu/吴雪峰 敬上
