| From: | Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com> |
|---|---|
| To: | Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com>, Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Replication vs. float timestamps is a disaster |
| Date: | 2017-02-22 15:27:00 |
| Message-ID: | f733bd4c-fd12-29c1-83c0-1c8073bd970b@2ndQuadrant.com |
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| Lists: | pgsql-hackers |
On 02/22/2017 10:21 AM, Jim Nasby wrote:
> 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.
No, in the datums.
cheers
andrew
--
Andrew Dunstan https://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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