Re: dfmgr additional ABI version fields

On 10/07/21 12:42, Tom Lane wrote:

> Can we make the addition be a string not a number, so that we
> could include something more useful than "1234" in the error
> message?

I was wondering the same thing, just to sidestep the "who hands out IDs"
question.

Just using a string like "EDB v" + something would probably rule out
collisions in practice. To be more formal about it, something like
the tag URI scheme [0] could be recommended. Nothing at runtime would
have to know or care about tag URI syntax; it would just match a string
with a fixed opaque prefix and some suffix. The scheme gives the developer
an easy way to construct a meaningful and reliably non-colliding string.

Surely loading libraries isn't a hot enough operation to begrudge
a strcmp.

Regards,
-Chap


[0] https://datatracker.ietf.org/doc/html/rfc4151