On Mon, Nov 26, 2018 at 7:47 PM Vik Fearing <vik.fear...@2ndquadrant.com> wrote: > > I'm way less inclined to buy into the idea that it MUST be wrong, though. > > Immutability is a promise about result stability and lack of side effects, > > but it is not a promise about implementation details. There could be an > > implementation reason not to run something in a parallel worker. Off the > > top of my head, a possible example is "it's written in plfoo which hasn't > > yet been made to work correctly in parallel workers". > > Now, see, that is an actual argument for making a difference. The other > arguments in this thread were not, so say I.
I agree with you that Tom is the first person to make a real argument for distinguishing these two things. And I think his argument is a good one. I suspect that there are other cases too. I don't think there are all that many cases, but I think they exist. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
