Re: Alter or rename enum value

On 26/03/16 08:17, Jim Nasby wrote:
> On 3/24/16 10:27 PM, Tom Lane wrote:
>> It's conceivable that we could do something like adding an "isdead"
>> column to pg_enum and making enum_in reject new values that're marked
>> isdead.  But I can't see that we'd ever be able to support true
>> removal of an enum value at reasonable cost.  And I'm not really sure
>> where the use-case argument is for working hard on it.
>
> I wonder if we could handle this by allowing foreign keys on enum 
> columns back to pg_enum. Presumably that means we'd have to treat 
> pg_enum as a regular table and not a catalog table. Due to locking 
> concerns I don't think we'd want to put the FKs in place by default 
> either.
>
> I've certainly heard people avoiding ENUMs because of their 
> limitations, so it'd be nice if there was a way to lift them.
Well, I use Enums extensively in Java.

However, I totally avoid using ENUMs in pg, due to their inflexibility!


Cheers,
Gavin