Subject: Re: Alter or rename enum value
To: Jim Nasby <Jim.Nasby@BlueTreble.com>, Tom Lane <tgl@sss.pgh.pa.us>
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Cc: Matthias Kurz <m.kurz@irregular.at>, pgsql-hackers@postgresql.org
From: Gavin Flower <GavinFlower@archidevsys.co.nz>
Organization: ArchiDevSys
Message-ID: <56F58FF9.101@archidevsys.co.nz>
Date: Sat, 26 Mar 2016 08:22:33 +1300
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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


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