Re: Alter or rename enum value

>
> ilmari(at)ilmari(dot)org (Dagfinn Ilmari Mannsåker) writes:
>
> >
> > I was bored and thought "how hard could it be?", and a few hours'
> > hacking later, I have something that seems to work. It doesn't do IF
> > NOT EXISTS yet, and the error messaging could do with some improvement,
> > and there are no docs. The patch is attached, as well as at
> > https://github.com/ilmari/postgres/commit/enum-alter-value
>
> I've added it to the 2016-09 commitfest as well:
> https://commitfest.postgresql.org/10/588/

Nice! Thank you!

Actually you still miss a "DROP VALUE" action. Also please make sure this
also works when altering an existing enum within a new transaction -
otherwise it does not really make sense (Usually someone wants to alter
existing enums, not ones that have just been created).

As a result a script like this should pass without problems:
-- ### script start
CREATE TYPE bogus AS ENUM('dog');

-- TEST 1:
BEGIN;
ALTER TYPE bogus ADD VALUE 'cat'; -- fails in 9.5 because of the
transaction but should work in future
COMMIT;

-- TEST 2:
BEGIN;
ALTER TYPE bogus RENAME TO bogon;
ALTER TYPE bogon ADD VALUE 'horse'; -- fails in 9.5 because of the
transaction but should work in future
COMMIT;

-- TEST 3:
BEGIN;
ALTER TYPE bogon ALTER VALUE 'dog' TO 'pig'; -- not implemented in 9.5 but
should work in future
ROLLBACK;

-- TEST 4:
BEGIN;
ALTER TYPE bogon DROP VALUE 'cat'; -- not implemented in 9.5 but should
work in future
ROLLBACK;
-- ### script end

End result of enum "bogon" (which was named "bogus" at the beginning of the
script):
-- ###
pig
horse
-- ###

Thank you!