On 01/31/2013 11:17 PM, Tom Lane wrote:
> Andrew Dunstan <andrew@dunslane.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