Re: Idea: Add first() and last() aggregate functions to the main release

For what it's worth, I support the inclusion of first() and last() in the main release. It makes queries involving multiple aggregate functions a lot simpler. Most hosted services only allow official contrib modules.

The module has been around for more than 10 years now. First on https://www.pgxn.org/dist/first_last_agg, then on https://github.com/wulczer/first_last_agg. And it's been available from apt.postgresql.org for a long time now.

Related questions pop up on Stackoverflow every now and then.

(I don't see anything related in the Postgres Todo, yet.)

The implementation in the additional module first_last_agg looks very simple and straight-forward. Might be an easy task to incorporate into mainline Postgres. But my C foo is just not good enough to judge whether the implementation is ideal.

Regards

Erwin