From: | Andres Freund <andres(at)anarazel(dot)de> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Proposal: scan key push down to heap [WIP] |
Date: | 2016-10-31 16:13:11 |
Message-ID: | 20161031161311.yuinkcx6i7wk423s@alap3.anarazel.de |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
On 2016-10-31 09:28:00 -0400, Robert Haas wrote:
> On Fri, Oct 28, 2016 at 2:46 AM, Andres Freund <andres(at)anarazel(dot)de> wrote:
> > Well, that'll also make the feature not particularly useful :(. My
> > suspicion is that the way to suceed here isn't to rely more on testing
> > as part of the scan, but create a more general fastpath for qual
> > evaluation, which atm is a *LOT* more heavyweight than what
> > HeapKeyTest() does. But maybe I'm biased since I'm working on the
> > latter...
>
> I think you might be right, but I'm not very clear on what the
> timeline for your work is.
Me neither. But I think if we can stomach Dilip's approach of using a
slot in heapam, then I think my concerns are addressed, and this is
probably going go to be a win regardless of faster expression evaluation
and/or batching.
> It would be easier to say, sure, let's put
> this on hold if we knew that in a month or two we could come back and
> retest after you've made some progress. But I don't know whether
> we're talking about months or years.
I sure hope it's months.
Andres
From | Date | Subject | |
---|---|---|---|
Next Message | Tom Lane | 2016-10-31 16:25:01 | Re: Implement targetlist SRFs using ROWS FROM() (was Changed SRF in targetlist handling) |
Previous Message | Daniel Gustafsson | 2016-10-31 16:11:17 | Re: Radix tree for character conversion |