Re: INSERT ... ON CONFLICT UPDATE/IGNORE 4.0

On Fri, May 8, 2015 at 11:06 AM, Andres Freund <andres@anarazel.de> wrote:
> On 2015-05-08 20:37:15 +0300, Heikki Linnakangas wrote:
>> Why does INSERT ON CONFLICT pay attention to indcheckxmin? Uniqueness check
>> only cares about the most recent committed version of the tuple, and the
>> index good for that use immediately. If there was a problem there, the
>> uniqueness check in a normal insert have the same problem.
>
> Yea, that's a good angle to view this from.  That'd not be the case, I
> think, if we'd allow this to be used on system relations. But since
> neither creating an index on system relations, nor using INSERT ON
> CONFLICT on them is supported...


+1. I knew we should have done this before commit.

-- 
Peter Geoghegan