| From: | Peter Geoghegan <pg(at)heroku(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Josh Berkus <josh(at)agliodbs(dot)com>, Alexander Korotkov <aekorotkov(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: jsonb contains behaviour weirdness |
| Date: | 2014-09-15 18:40:49 |
| Message-ID: | CAM3SWZR2f+=CLrOziRv4XWp8cXbOtgdLv+fh0C=jdjYrc0hZHA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Sep 15, 2014 at 11:29 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> It might be that the benefit is very close to nil; that would depend a lot
> on workload, so it's hard to be sure. I'd say though that the cost is
> also very close to nil, in the sense that we're considering two additional
> compare-and-branch instructions in a function that will surely expend
> hundreds or thousands of instructions if there's no such short-circuit.
Fair enough.
--
Peter Geoghegan
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