From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Andres Freund <andres(at)anarazel(dot)de> |
Cc: | Simon Riggs <simon(at)2ndQuadrant(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Zhaomo Yang <zhy001(at)cs(dot)ucsd(dot)edu>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Robert Haas <robertmhaas(at)gmail(dot)com> |
Subject: | Re: Implementation of global temporary tables? |
Date: | 2015-07-15 15:39:47 |
Message-ID: | 5474.1436974787@sss.pgh.pa.us |
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Andres Freund <andres(at)anarazel(dot)de> writes:
> On 2015-07-15 16:24:52 +0100, Simon Riggs wrote:
>> It may be possible to do this, though I'm sure there's a wrinkle somewhere.
>> But there doesn't seem to be a need to overload the main feature request
>> with additional requirements. Doing that is just scope creep that prevents
>> us getting features out. Nice, simple patches from newer developers. Later
>> tuning and tweaking from more expert community members.
> I think that's generally a fair point. But here we're discussing to add
> a fair amount of wrinkles with the copy approach. The fact alone that
> the oid is different will have some ugly consequences.
> So we add complexity, just to shift it into different places later? I'm
> not sure that's a good idea.
With all due respect, there are features that are beyond the abilities of
some "newer developers", and reducing the scope isn't a good way to fix
that. It just leaves a bigger mess to be cleaned up later.
I think Andres' idea of a per-backend filenode mapping table might work.
The existing relfilenode mapper solves a somewhat related problem, namely
how do you replace the filenode for shared system catalogs whose pg_class
entries can't be changed.
regards, tom lane
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