From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, KaiGai Kohei <kaigai(at)kaigai(dot)gr(dot)jp>, KaiGai Kohei <kaigai(at)ak(dot)jp(dot)nec(dot)com>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Itagaki Takahiro <itagaki(dot)takahiro(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: leaky views, yet again |
Date: | 2010-10-20 14:49:37 |
Message-ID: | AANLkTikhPDuhrTTd7N5TPCvButrdm8BQZYU=VRse9iuW@mail.gmail.com |
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On Wed, Oct 20, 2010 at 10:00 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> I get the impression that you think that there's a problem not only
>> with the approach but with any approach whatsoever to that underlying
>> problem.
>
> Let's just say that the approaches proposed so far have performance
> and/or functionality and/or code maintenance penalties that are utterly
> unacceptable from the standpoint of people who don't need RLS. I don't
> know if there is a workable solution, but I do know I've not seen one.
>
>> With respect to selectivity estimation, do we have a live bug there
>> now?
>
> No, I don't believe so. Given that you'd like to get the planner to
> call function XYZ, you could create an operator using XYZ and attach to
> it one of the estimation functions that will actually call the
> underlying function --- but you have to have call permission on the
> function in order to create the operator.
But suppose the operator already exists, but I don't have permission
to call the underlying function... can I get the planner to call the
function for me by EXPLAIN-ing the right query?
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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