Implement NullUUID

[pmalekn]

In order to allow uuid.UUID to work with the standard sql package to represent a UUID value that can be NULL in the database I suggest to implement a NullUUID the same way as
it's done in http://github.com/satori/go.uuid [1]

[1] https://pkg.go.dev/github.com/satori/go.uuid@v1.2.0?tab=doc#NullUUID

[pborman]

Looking at the code it appears that NullUUID can actually be implemented outside of the uuid package itself. Have you considered making a simple package that provides this type?

[pmalekn]

Ha! Didn't think about this obvious solution.
Still it would be nice to implement it in here to make it more idiomatic.
Instead of importing a separate package and calling a type e.g. null.UUID we could use the very same package that defines the uuid.UUID and use the type as uuid.Null.

I'd be happy to submit a PR basing the work on satori's implementation.

[agravelot]

This issue seems to be fixed, am I wrong?

[Alcas1]

Should be able to close this one