Re: Add SPLIT PARTITION/MERGE PARTITIONS commands

On Fri, Aug 9, 2024 at 10:18 AM Dmitry Koval <d.koval@postgrespro.ru> wrote:
> > This breaks from the CVE-2014-0062 (commit 5f17304) principle of not repeating
> > name lookups.  The attached demo uses this defect to make one partition have
> > two parents.
>
> Thank you very much for information (especially for the demo)!
>
> I'm not sure that we can get the identifier of the newly created
> partition from the ProcessUtility() function...
> Maybe it would be enough to check that the new partition is located in
> the namespace in which we created it (see attachment)?

The new partition doesn't necessarily get created in the same
namespace as parent partition.  I think it would be better to somehow
open partition by its oid.

It would be quite unfortunate to replicate significant part of
ProcessUtilitySlow().  So, the question is how to get the oid of newly
created relation from ProcessUtility().  I don't like to change the
signature of ProcessUtility() especially as a part of backpatch.  So,
I tried to fit this into existing parameters.  Probably
QueryCompletion struct fits this purpose best from the existing
parameters.  Attached draft patch implements returning oid of newly
created relation as part of QueryCompletion.  Thoughts?

------
Regards,
Alexander Korotkov
Supabase