On Sun, Dec 16, 2018 at 07:07:35PM -0300, Alvaro Herrera wrote:
> I'll self-review this again tomorrow, 'cause I now have to run.

> -             if (!is_partition)
> -                     relation = heap_openrv(parent, 
> ShareUpdateExclusiveLock);
> -             else
> -                     relation = heap_openrv(parent, AccessExclusiveLock);
> +             /* caller already got lock */
> +             relation = heap_open(parent, NoLock);

Okay, I think that you should add an assertion on
CheckRelationLockedByMe() as MergeAttributes()'s only caller is
DefineRelation().  Better safe than sorry later.
--
Michael

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