From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
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To: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Improving RLS qual pushdown |
Date: | 2015-01-14 21:42:28 |
Message-ID: | CA+Tgmob5gxKT0sEqydP7gu4vebhdPpx254HixJMTej=n84K3DA@mail.gmail.com |
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Lists: | pgsql-hackers |
On Wed, Jan 14, 2015 at 9:22 AM, Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> wrote:
> On 14 January 2015 at 13:29, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>> One thing they could still leak is the number of times they got
>> called, and thus possibly the number of unseen rows. Now if the
>> expressions get constant-folded away that won't be an issue, but a
>> clever user can probably avoid that.
>
> Right now, EXPLAIN ANALYSE can be used to tell you the number of
> unseen rows. Is that something that people are concerned about, and
> are there any plans to change it?
Interesting question. I don't know.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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