[petergeoghegan]

> as of 2017 at least the plan was to implement merge using the underlying insert on conflict mechanism

That was something that was discussed at length at the time, but ultimately rejected. And so the implementation of MERGE in Postgres has essentially the same limitations as every other MERGE implementation that I'm familiar with.

Postgres clearly stresses the trade-off that MERGE makes in the docs, though. Which probably sets it apart.

[gfody]

afaik postgres still doesn't have a merge command (just tested on 14.2)?

[petergeoghegan]

It will be in Postgres 15, which will be out later in the year