| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Cédric Villemain <cedric(dot)villemain(dot)debian(at)gmail(dot)com>, panam <panam(at)gmx(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [PERFORM] Hash Anti Join performance degradation |
| Date: | 2011-06-01 20:58:36 |
| Message-ID: | BANLkTimXuMGGv_vPQrQjR17K3QomP8NnQw@mail.gmail.com |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-performance |
On Wed, Jun 1, 2011 at 4:47 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> I guess the real issue here is that m1.id < m2.id has to be evaluated
>> as a filter condition rather than a join qual.
>
> Well, if you can invent an optimized join technique that works for
> inequalities, go for it ... but I think you should get at least a
> PhD thesis out of that.
Sounds good, except that so far NOT getting a PhD seems like a much
better financial prospect. :-)
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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