Re: [HACKERS] Replication vs. float timestamps is a disaster

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
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