| From: | Filip Rembiałkowski <plk(dot)zuber(at)gmail(dot)com> |
|---|---|
| To: | "Vincenzo Romano" <vincenzo(dot)romano(at)gmail(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: stable functions |
| Date: | 2007-05-31 11:23:36 |
| Message-ID: | 92869e660705310423p32def3d4k54c156600fdd622b@mail.gmail.com |
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| Lists: | pgsql-general |
2007/5/31, Vincenzo Romano <vincenzo(dot)romano(at)gmail(dot)com>:
> Hi all.
>
> Can functions whose effect is to create functions (yep!)
> be labelled as "stable"?
According to the docs, no.
"STABLE indicates that the function cannot modify the database (...)
any function that has side-effects must be classified volatile"
http://www.postgresql.org/docs/8.2/static/sql-createfunction.html
If you labeled creatorfunc(param) as stable, ant then issued "SELECT
creatorfunc(sometable.param) FROM sometable", there is a theoretical
risk that creatorfunc would be called only _once_ for each distinct
value of param.
--
Filip Rembiałkowski
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