[stream_fusion]

Everyone who needs 'upsert' is forced to go and read those discussions (and probably a few more articles as well), and then implement their own version of the same thing many times over.

The fact that it's complicated is precisely the reason this ought to be solved for the general case.

Otherwise, Postgresql is still an awesome product.

[jeltz]

Nah, you do not need to read those discussions unless you want to help out with the current patch which if enough people help out might land in PostgreSQL 9.5.