pg.ddx.io  pgsql-hackers@postgresql.org mailing list archive  

help / color / mirror / Atom feed
From: Jim Nasby <Jim.Nasby@BlueTreble.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Matthias Kurz <m.kurz@irregular.at>
Cc: pgsql-hackers@postgresql.org
Subject: Re: Alter or rename enum value
Date: Fri, 25 Mar 2016 14:17:00 -0500
Message-ID: <56F58EAC.4040802@BlueTreble.com> (raw)
In-Reply-To: <27476.1458876456@sss.pgh.pa.us>
References: <CAO=2mx6uvgPaPDf-rHqG8=1MZnGyVDMQeh8zS4euRyyg4D35OQ@mail.gmail.com>
	<56E049CC.8010201@dunslane.net>
	<25605.1457539654@sss.pgh.pa.us>
	<56E05635.70908@dunslane.net>
	<28167.1457543612@sss.pgh.pa.us>
	<CAO=2mx4rQHRvifT2yUQ1rz90A=9CVz4_Z0Sx1wTgwgQRzAimpQ@mail.gmail.com>
	<CAO=2mx6rK_h4BC7y+3Nu-8fuZJXdFjd9FE_MZnzkH+vnMp0C-Q@mail.gmail.com>
	<d8ja8ln7nl0.fsf@dalvik.ping.uio.no>
	<d8j60wb7na4.fsf@dalvik.ping.uio.no>
	<CAO=2mx6CgQXFJYXOpr4OJO+r8WX6PzEU5aT+K0vV94G7DxVJ0A@mail.gmail.com>
	<56F49CF8.8050007@BlueTreble.com>
	<27476.1458876456@sss.pgh.pa.us>
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-hackers>

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.
-- 
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com


-- 
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers



view thread (56+ messages)  latest in thread

Message-ID: <56F58EAC.4040802@BlueTreble.com>
Permalink:  ../56F58EAC.4040802@BlueTreble.com/
Also on:    postgresql.org/message-id/56F58EAC.4040802@BlueTreble.com

 · 

reply
Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: pgsql-hackers@postgresql.org
  Cc: Jim.Nasby@BlueTreble.com, tgl@sss.pgh.pa.us, m.kurz@irregular.at
  Subject: Re: Alter or rename enum value
  In-Reply-To: <56F58EAC.4040802@BlueTreble.com>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox