Re: [HACKERS] Runtime Partition Pruning

On Sat, Apr 7, 2018 at 5:13 PM, Alvaro Herrera <alvherre@alvh.no-ip.org> wrote:
> I had reservations about a relation_open() in the new executor code.  It
> seemed a bit odd; we don't have any other relation_open in the executor
> anywhere.  However, setting up the pruneinfo needs some stuff from
> relcache that I don't see a reasonable mechanism to pass through
> planner.  I asked Andres about it on IM and while he didn't endorse the
> patch in any way, his quick opinion was that "it wasn't entirely
> insane".  I verified that we already hold lock on the relation.

I don't get this.  The executor surely had to (and did) open all of
the relations somewhere even before this patch.

-- 
Robert Haas
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