One reason you might prefer to use the JOIN a BY 1, b BY 1 syntax is to specify a type of join such as the replicated join which will increase the performance.
On Fri, May 24, 2013 at 9:15 AM, Jonathan Coveney <jcove...@gmail.com>wrote: > You can do this, but pig has a CROSS keyword that you can use. > > > 2013/5/23 Mehmet Tepedelenlioglu <mehmets...@yahoo.com> > > > Hi, > > > > I am using this: > > > > x = join a by 1, b by 1 using 'replicated'; > > > > with the hope that it generates some synthetic key '1' on both a and b > and > > joins it on that key, thereby, in this case, doing a clean map side cross > > of > > a and b with no schema changes (exactly the way a cross would work). It > > seems to be working, but since I just tried it and it worked, I am not > sure > > if there is anything in there I should be aware of. Does anyone know? > > > > Thanks, > > > > Mehmet > > > > > > >
