On Mon, Jan 23, 2023 at 3:41 PM Robert Haas <robertmh...@gmail.com> wrote: > > On Mon, Jan 23, 2023 at 3:19 PM James Coleman <jtc...@gmail.com> wrote: > > On Mon, Jan 23, 2023 at 1:26 PM Robert Haas <robertmh...@gmail.com> wrote: > > > On Mon, Jan 23, 2023 at 8:31 AM James Coleman <jtc...@gmail.com> wrote: > > > > See the attached for a simple comment fix -- the referenced > > > > generate_useful_gather_paths call isn't in grouping_planner it's in > > > > apply_scanjoin_target_to_paths. > > > > > > The intended reading of the comment is not clear. Is it telling you to > > > look at grouping_planner because that's where we > > > generate_useful_gather_paths, or is it telling you to look there to > > > see how we get the final target list together? If it's the former, > > > then your fix is correct. If the latter, it's fine as it is. > > > > > > The real answer is probably that some years ago both things happened > > > in that function. We've moved on from there, but I'm still not sure > > > what the most useful phrasing of the comment is. > > > > Yeah, almost certainly, and the comments just didn't keep up. > > > > Would you prefer something that notes both that the broader concern is > > happening via the grouping_planner() stage but still points to the > > proper callsite (so that people don't go looking for that confused)? > > I don't really have a strong view on what the best thing to do is. I > was just pointing out that the comment might not be quite so obviously > wrong as you were supposing.
"Wrong" is certainly too strong; my apologies. I'm really just hoping to improve it for future readers to save them some confusion I had initially reading it. James Coleman
