| From: | Hannu Krosing <hannu(at)skype(dot)net> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| 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 14:12:15 |
| Message-ID: | 1133878335.3608.3.camel@localhost.localdomain |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
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.
-------------
Hannu
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Tom Lane | 2005-12-06 14:29:33 | Re: [PATCHES] snprintf() argument reordering not working |
| Previous Message | John D. Burger | 2005-12-06 13:35:50 | Re: Reduce NUMERIC size by 2 bytes, reduce max length to 508 |