On 2017-01-17 13:43:38 -0500, Tom Lane wrote:
> Although ... looking closer at Andres' patch, the new node type *is*
> channeling Result, in the sense that it might or might not have any input
> plan. This probably traces to what I wrote in September:
>
> + * XXX Possibly-temporary hack: if the subpath is a dummy ResultPath,
> + * don't bother with it, just make a Result with no input. This avoids an
> + * extra Result plan node when doing "SELECT srf()". Depending on what we
> + * decide about the desired plan structure for SRF-expanding nodes, this
> + * optimization might have to go away, and in any case it'll probably look
> + * a good bit different.
>
> I'm not convinced that that optimization is worth preserving, but if we
> keep it then ProjectSet isn't le mot juste here, any more than you'd want
> to rename Result to Project without changing its existing
> functionality.
Right. I'd removed that, and re-added it; primarily because the plans
looked more complex without it. After all, you'd thought it worth adding
that hack ;) I'm happy with removing it again too.
Andres