| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Kouhei Kaigai <kaigai(at)ak(dot)jp(dot)nec(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Proposal: scan key push down to heap [WIP] |
| Date: | 2016-11-29 04:25:33 |
| Message-ID: | 20161129042533.3hmovra3x2uufrj4@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2016-11-28 09:55:00 -0500, Robert Haas wrote:
> I think we should go with this approach. I don't think it's a good
> idea to have the heapam layer know about executor slots.
I agree that that's not pretty.
> Even though
> it's a little sad to pass up an opportunity for a larger performance
> improvement, this improvement is still quite good.
It's imo not primarily about a larger performance improvement, but about
avoid possible regressions. Doubling deforming of wide tuples will have
noticeable impact on some workloads. I don't think we can disregard
that.
Andres
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