Investigate type-safe joins

[OlivierBlanvillain]

[imarios]

Hey @OlivierBlanvillain, is this still relevant?

[OlivierBlanvillain]

Yes, our support for joins is still more than preliminary.

[ayoub-benali]

@OlivierBlanvillain now that joins in 0.5.0 have been reworked I guess this can be closed ?