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From: Jim Nasby <Jim.Nasby@BlueTreble.com>
To: Andres Freund <andres@anarazel.de>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Petr Jelinek <petr.jelinek@2ndquadrant.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Subject: Re: Replication vs. float timestamps is a disaster
Date: Wed, 22 Feb 2017 09:21:18 -0600
Message-ID: <8ac3b446-00e0-2813-e67a-0498fac0f9b0@BlueTreble.com> (raw)
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On 2/22/17 9:12 AM, Andres Freund wrote:
>> That would allow an in-place upgrade of
>> a really large cluster. A user would still need to modify their code to use
>> the new type.
>>
>> Put another way: add ability for pg_upgrade to change the type of a field.
>> There might be other uses for that as well.
> Type oids are unfortunately embedded into composite and array type data
> - we can do such changes for columns themselves, but it doesn't work if
> there's any array/composite members containing the to-be-changed type
> that are used as columns.

Only in the catalog though, not the datums, right? I would think you 
could just change the oid in the catalog the same as you would for a 
table column.
-- 
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
855-TREBLE2 (855-873-2532)


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