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...

Greetings,

Andres Freund


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