| From: | ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Gregory Stark <stark(at)enterprisedb(dot)com>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, "jd(at)commandprompt(dot)com" <jd(at)commandprompt(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, Greg Smith <gsmith(at)gregsmith(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: benchmarking the query planner |
| Date: | 2009-03-19 08:04:42 |
| Message-ID: | 20090319165210.D879.52131E4D@oss.ntt.co.jp |
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| Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> >> Works for me. Especially if you want to think more about ANALYZE before
> >> changing that.
> >
> > Well, it's something that would be sane to contemplate adding in 8.4.
> > It's way too late for any of this other stuff to happen in this release.
>
> I'm thinking about trying to implement this, unless someone else is
> already planning to do it. I'm not sure it's practical to think about
> getting this into 8.4 at this point, but it's worth doing whether it
> does or not.
Can we use get_relation_stats_hook on 8.4? The pg_statistic catalog
will be still modified by ANALYZEs, but we can rewrite the statistics
just before it is used.
your_relation_stats_hook(root, rte, attnum, vardata)
{
Call default implementation;
if (rte->relid = YourRelation && attnum = YourColumn)
((Form_pg_statistic) (vardata->statsTuple))->stadistinct = YourNDistinct;
}
Regards,
---
ITAGAKI Takahiro
NTT Open Source Software Center
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