| From: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> |
|---|---|
| To: | Thom Brown <thom(at)linux(dot)com> |
| Cc: | Tomas Vondra <tv(at)fuzzy(dot)cz>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
| Subject: | Re: GIN improvements part2: fast scan |
| Date: | 2014-09-26 12:55:26 |
| Message-ID: | 5425623E.3030502@vmware.com |
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| Lists: | pgsql-hackers |
On 09/25/2014 09:05 PM, Thom Brown wrote:
> On 12 March 2014 16:29, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> wrote:
>> Good point. We have done two major changes to GIN in this release cycle:
>> changed the data page format and made it possible to skip items without
>> fetching all the keys ("fast scan"). gincostestimate doesn't know about
>> either change.
>
> Did this cost estimation issue get fixed?
Nope.
> If not, and if this is due for 9.5, can this be removed from the 9.4 open items list?
Removed and moved to the TODO list. It's a pity, but no-one seems to
have a great idea on what to do about the cost estimation, nor interest
in working on it.
- Heikki
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