On August 31, 2016 3:00:15 PM PDT, Tomas Vondra <tomas.von...@2ndquadrant.com> 
>On 08/31/2016 11:43 PM, Andres Freund wrote:
>> On 2016-08-31 23:40:46 +0200, Tomas Vondra wrote:
>>> It's an improvement (and it's pretty much exactly what I proposed
>>> upthread). But it does not solve the problems with pg_statistic for
>>> example (each backend needs it's own statistics. So we'd either
>>> the pg_statistic (if we manage to solve the problem that the table
>>> the same oid in all backends), or we would need in-memory tuples
>>> like discussed in the thread so far).
>> Creating a session private version of pg_statistic would be fairly
>> simple.
>Sure. I'm just saying it's not as simple as overriding relpath.
>ISTM we only need the pg_statistics (as other catalogs are connected to
>the pg_class entry), which does not have the dependency issues. Or do
>need other catalogs?

In my experience pg attribute is usually the worst affected. Many tech takes 
won't even have stays entries...

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