| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, pgsql-performance(at)postgresql(dot)org, Andreas Kretschmer <akretschmer(at)spamfence(dot)net> |
| Subject: | Re: BETWEEN optimizer problems with single-value |
| Date: | 2006-03-16 19:45:34 |
| Message-ID: | 19304.1142538334@sss.pgh.pa.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers pgsql-performance |
Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
> I was thinking that we would fill out the OpExpr with different
> opclasses for each plan, so each one sees a different story. (I was
> thinking there was a clauselist for each plan; if not, there could be.)
This is backwards: there isn't a plan yet. If there were, having
clauselist_selectivity return different answers depending on what index
the plan was thinking of using would still be wrong.
> [BTW how do you add new indexes to system tables? I want to add one to
> pg_inherits but not sure where to look.]
src/include/catalog/indexing.h
Offhand I think adding a new entry is all you have to do. You may also
want a syscache to go with it, which'll take a bit more work.
regards, tom lane
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Jonah H. Harris | 2006-03-16 19:46:11 | Re: qsort, once again |
| Previous Message | Dann Corbit | 2006-03-16 19:45:05 | Re: qsort, once again |
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Simon Riggs | 2006-03-16 20:00:19 | Re: BETWEEN optimizer problems with single-value |
| Previous Message | Simon Riggs | 2006-03-16 19:43:22 | Re: BETWEEN optimizer problems with single-value |