Re: [HACKERS] Custom compression methods

On 3/30/21 10:30 AM, Tom Lane wrote:
> Robert Haas <robertmhaas@gmail.com> writes:
>> On Wed, Mar 24, 2021 at 2:15 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>>> But let's ignore the case of pg_upgrade and just consider a dump/restore.
>>> I'd still say that unless you give --no-toast-compression then I would
>>> expect the dump/restore to preserve the tables' old compression behavior.
>>> Robert's argument that the pre-v14 database had no particular compression
>>> behavior seems nonsensical to me.  We know exactly which compression
>>> behavior it has.
> 
>> I said that it didn't have a state, not that it didn't have a
>> behavior. That's not exactly the same thing. But I don't want to argue
>> about it, either. It's a judgement call what's best here, and I don't
>> pretend to have all the answers. If you're sure you've got it right
>> ... great!
> 
> I've not heard any other comments about this, but I'm pretty sure that
> preserving a table's old toast behavior is in line with what we'd normally
> expect pg_dump to do --- especially in light of the fact that we did not
> provide any --preserve-toast-compression switch to tell it to do so.
> So I'm going to go change it.

It looks like this CF entry should have been marked as committed so I 
did that.

Regards,
-- 
-David
david@pgmasters.net