On 22 September 2015 at 21:14, Alvaro Herrera <alvhe...@2ndquadrant.com> wrote:
> Robert Haas wrote: > > On Tue, Sep 22, 2015 at 10:34 AM, Simon Riggs <si...@2ndquadrant.com> > wrote: > > > > For 1, Gather makes most sense. > > > > Yeah, I'm leaning that way myself. Amit argued for "Parallel Gather" > > but I think that's overkill. There can't be a non-parallel gather, > > and long names are a pain. > > "Gather" seems a pretty decent choice to me too, even if we only have a > single worker (your "1"). I don't think there's much need to > distinguish 1 from 2, is there? > I think so. 1 is Many->1 and the other is 1->Many. You may wish to do an operation like a parallel merge join. Parallel Sort -> Scatter -> Parallel Merge -- Simon Riggs http://www.2ndQuadrant.com/ <http://www.2ndquadrant.com/> PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
