Re: BUG #17349: Function gen_random_uuid duplicates in pgcrypto and core

On 28 Dec 2021, at 18:41, Tom Lane <tgl@sss.pgh.pa.us> wrote:

PG Bug reporting form <noreply@postgresql.org> writes:

As stated in
https://www.postgresql.org/docs/current/pgcrypto.html#id-1.11.7.35.10, the
function gen_random_uuid is now part of core PostgreSQL. Shouldn't this
function be removed from the pgcrypto-extension as of PostgreSQL 13?

pg_crypto's gen_random_uuid() is now just a wrapper for the core function.
Taking it out entirely would save only a couple lines of code.

If you install the pgcrypto-extension in the pg_catalog-schema (yes, I'm
aware if installing it in public the error doesn't occur) you get an
error:

The contrary side of that is that taking it out of the extension could
break applications that expect gen_random_uuid() to exist in the
extension's schema.  I don't think we consider installing extensions
in pg_catalog to be a supported case, anyway.

See previous discussion at

https://www.postgresql.org/message-id/flat/5b2c6230-e0b9-59a9-b945-c7d38fdae296%402ndquadrant.com#7ff316009e81aad797b6c0136251118c

regards, tom lane