Re: [Proposal] Global temporary tables

> 2022年2月27日 12:13，Andres Freund <andres(at)anarazel(dot)de> 写道：
>
> Hi,
>
> On 2022-02-27 04:17:52 +0100, Pavel Stehule wrote:
>>> You redirect stats from pg_class and pg_statistics to a local hash table.
>>> This is pretty hairy :(
>
> As is I think the patch is architecturally completely unacceptable. Having
> code everywhere to redirect to manually written in-memory catalog table code
> isn't maintainable.
>
>
>>> I guess you'd also need to handle pg_statistic_ext and ext_data.
>>> pg_stats doesn't work, since the data isn't in pg_statistic - it'd need to
>>> look
>>> at pg_get_gtt_statistics.
>>
>> Without this, the GTT will be terribly slow like current temporary tables
>> with a lot of problems with bloating of pg_class, pg_attribute and
>> pg_depend tables.
>
> I think it's not a great idea to solve multiple complicated problems at
> once...

I'm trying to break down the entire implementation into multiple sub-patches.

Regards, Wenjing.

>
> Greetings,
>
> Andres Freund
>
>