Richard Guo <guofengli...@gmail.com> writes: > BTW, the comment just above the two calls to build_joinrel_tlist says: > * Create a new tlist containing just the vars that need to be output from > Here by 'vars' it means both plain Vars and PlaceHolderVars, right? If > not we may need to adjust this comment to also include PlaceHolderVars.
I think it did intend just Vars because that's all that build_joinrel_tlist did; but we really should have updated it when we invented PlaceHolderVars, and even more so now that build_joinrel_tlist adds PHVs too. I changed the wording. > A minor comment is that seems we can get rid of phid inside > PlaceHolderInfo, since we do not do linear list searches any more. It's > some duplicate to the phid inside PlaceHolderVar. Currently there are > two places referencing PlaceHolderInfo->phid, remove_rel_from_query and > find_placeholder_info. We can use PlaceHolderVar->phid instead in both > the two places. Meh, I'm not excited about that. I don't think that the phid field is only there to make the search loops faster; it's the basic identity of the PlaceHolderInfo. regards, tom lane