[mb4nck]

Notably, that feature got written by somebody from Salesforce (I assume on their work time, but not sure), and finished up by a Postgres major contributor. It might be the first major contribution from Salesforce outside of all the stuff Tom Lane did when he was working there.

[petergeoghegan]

Not so. I worked on UPSERT for several years as a Salesforce employee, as well as quite a number of other things. I worked for Heroku, a Salesforce business unit, from 2013-2017.