| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| 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 20:47:36 |
| Message-ID: | 24707.1306961256@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-performance |
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.
regards, tom lane
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