| From: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | Hannu Krosing <hannu(at)skype(dot)net> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Philip Warner <pjw(at)rhyme(dot)com(dot)au>, pgsql-hackers(at)postgreSQL(dot)org |
| Subject: | Re: Optimizer oddness, possibly compounded in 8.1 |
| Date: | 2005-12-06 18:32:53 |
| Message-ID: | 1133893973.2906.876.camel@localhost.localdomain |
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| Lists: | pgsql-hackers |
On Tue, 2005-12-06 at 16:12 +0200, Hannu Krosing wrote:
> Ühel kenal päeval, L, 2005-12-03 kell 09:21, kirjutas Simon Riggs:
>
> > First off, I think we need to do some more work on partitioning so that
> > some knowledge about the union set is understood by the optimizer. At
> > the moment there is no concept of partition key, so its hard to spot
> > when two union sets have the same key to allow pushdown.
>
> One of the easier cases would be non-overlapping (exclusive) constraints
> on union subtables on the joined column.
>
> This could serve as a "partition key", or in case of many nonoverlapping
> columns (ex.: table is partitioned by date and region), as many
> partition keys.
Yes, thats my planned direction.
Best Regards, Simon Riggs
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