| From: | Dimitri Fontaine <dimitri(at)2ndQuadrant(dot)fr> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Alexander Korotkov <aekorotkov(at)gmail(dot)com>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Stas Kelvich <stas(dot)kelvich(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, pgsql-students(at)postgresql(dot)org |
| Subject: | Re: [HACKERS] Cube extension point support // GSoC'13 |
| Date: | 2013-10-21 22:00:24 |
| Message-ID: | m28uxmthc7.fsf@2ndQuadrant.fr |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers pgsql-students |
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:
> I believe the reason GIST has compress/decompress functions is not for
> TOAST (they predate that, if memory serves), but to allow the on-disk
> representation of an index entry to be different from the data type's
> normal representation in other ways --- think lossy storage in particular.
My understanding of the use case for those functions is to do with
storing a different data type in the index upper nodes and in the index
leafs. It should be possible to do that in a non-lossy way, so that you
would implement compress/decompress and not declare the RECHECK bits.
Then again I'm talking from 8.3 era memories of when I tried to
understand GiST enough to code the prefix extension.
Regards,
--
Dimitri Fontaine
http://2ndQuadrant.fr PostgreSQL : Expertise, Formation et Support
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Alvaro Herrera | 2013-10-21 22:09:26 | Re: Add min and max execute statement time in pg_stat_statement |
| Previous Message | Gavin Flower | 2013-10-21 21:47:15 | Re: Add min and max execute statement time in pg_stat_statement |
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Alexander Korotkov | 2013-10-22 07:36:59 | Re: [HACKERS] Cube extension point support // GSoC'13 |
| Previous Message | Tom Lane | 2013-10-21 19:41:16 | Re: [HACKERS] Cube extension point support // GSoC'13 |