On Thu, Jun 13, 2019 at 01:22:16PM -0400, Tom Lane wrote: > Robert Haas <robertmh...@gmail.com> writes: > > The release notes say: > > <listitem> > > <!-- > > Author: Tom Lane <t...@sss.pgh.pa.us> > > 2018-12-30 [b5415e3c2] Support parameterized TidPaths. > > Author: Tom Lane <t...@sss.pgh.pa.us> > > 2018-12-30 [0a6ea4001] Add a hash opclass for type "tid". > > --> > > > <para> > > Improve optimization of self-joins (Tom Lane) > > </para> > > </listitem> > > > I don't think that's an accurate summary of those two items. It's > > true that they could make self-joins more efficient, but my reading is > > that it would only do so if the self-join happened to use the ctid > > column. > > Yeah. I think Bruce misread the commit messages, which commented that > joining on TID is only likely to be useful in a self-join. > > > So I think that this should probably be changed to say something like > > "Improve optimization of self-joins on ctid columns" or "Improve > > optimization of joins involving columns of type tid." > > The latter seems fine to me.
I have updated to use the later wording. -- Bruce Momjian <br...@momjian.us> http://momjian.us EnterpriseDB http://enterprisedb.com + As you are, so once was I. As I am, so you will be. + + Ancient Roman grave inscription +