Re: Implementation of global temporary tables?

On 2015-07-15 16:52:49 +0200, Andres Freund wrote:
> Why do we need to create that copy? We can just use the relfilenode in
> all backends by having the backendid in the filename? Yes, there's a
> some amount of additional code needed, but it's not that much?  I
> actually think it might end up being less additional code than having a
> copy, because with the copy you'll have two different oids for global
> entry and the local copy.

Hm, yes. Brainfart. Transaction table rewrites/truncations need to
change the relfilenode.

To fix We could add a backend local mapping table from global temp table
id to the backend local relfilenode. The code to lookup the relfilenode
is already mostly isolated.