| From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: parameter info? |
| Date: | 2013-02-01 13:34:21 |
| Message-ID: | 510BC45D.8070306@dunslane.net |
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| Lists: | pgsql-hackers |
On 01/31/2013 11:17 PM, Tom Lane wrote:
> Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
>> What's the best way for me to find out if a given parameter of a
>> function is a constant? The context is that it's expensive to process,
>> and in most cases will in fact be a constant, so if it is in fact a
>> constant I'd like to process it once and stash the results.
> I think we added get_fn_expr_arg_stable() for precisely that
> purpose.
>
>
Thanks. That's exactly what I was looking for.
cheers
andrew
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