| From: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
|---|---|
| To: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: to-do item for explain analyze of hash aggregates? |
| Date: | 2017-04-24 20:59:10 |
| Message-ID: | 7c8e81d0-3c68-03c4-28f9-f229c1fbeb6f@2ndquadrant.com |
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| Lists: | pgsql-hackers |
On 04/24/2017 10:55 PM, Jeff Janes wrote:
> On Mon, Apr 24, 2017 at 12:13 PM, Tomas Vondra
> <tomas(dot)vondra(at)2ndquadrant(dot)com <mailto:tomas(dot)vondra(at)2ndquadrant(dot)com>> wrote:
>
> On 04/24/2017 08:52 PM, Andres Freund wrote:
>
> ...
>
> I've wanted that too. It's not impossible at all.
>
>
> Why wouldn't that be possible? We probably can't use exactly the
> same approach as Hash, because hashjoins use custom hash table while
> hashagg uses dynahash IIRC. But why couldn't measure the amount of
> memory by looking at the memory context, for example?
>
>
> He said "not impossible", meaning it is possible.
>
Ah, the dreaded double negative ...
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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