Add support for Postgres multirange

[Tom Carrick]

Postgres 14 adds various multirange data types corresponding to the existing range types: ​https://www.postgresql.org/docs/14/rangetypes.html

e.g.:

select nummultirange(numrange(null, 2), numrange(4, 5), numrange(8, 9));

Gives "{(,2),[4,5),[8,9)}".

I would like to have some support for these in Django.

One use case: an app that finds time for meetings. Each user submits ranges of times they're available on a calendar and the app suggests times that works for everyone / the most people.

[Tom Carrick]

I just found https://code.djangoproject.com/ticket/33238 for this issue but closed as wontfix. I didn't find it the first time because I searched for "multirange" rather than "multi range".

Anyway I do think this can be implemented without too much of a maintenance burden. I have some ideas on the implementation but I haven't thought about it too closely.

I just wanted to add this because I didn't see the original ticket so I'm not sure if this one should be closed as well.

[Mariusz Felisiak]

Thanks! I had a gut feeling that I'd seen it already 🤦. Let's close it as a duplicate of #33238. Please leave a comment in the original ticket. We can reopen it if you provides PoC that is maintainable.