| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: ToDo: fast update of arrays with fixed length fields for PL/pgSQL |
| Date: | 2013-10-02 17:01:49 |
| Message-ID: | 20131002170149.GA19661@awork2.anarazel.de |
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| Thread: | |
| Lists: | pgsql-hackers |
Hi,
On 2013-10-02 18:56:51 +0200, Pavel Stehule wrote:
> Hello
>
> this proposal is related to reported issue
> http://www.postgresql.org/message-id/E1VQuta-0007Y4-Ip@wrigleys.postgresql.org
>
>
> We can directly modify any fields of int, float, double arrays (when result
> size will be immutable). This trick is used now for acceleration of some
> aggregates.
>
> Ideas, comments?
A specific array might be located directly on a buffer - starting to
manipulate them inplace will lead to havoc in such scenarios. I don't
think we have the infrastructure for detecting such cases.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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