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Re: parameter info?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Andrew Dunstan <andrew(at)dunslane(dot)net>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: parameter info?
Date: 2013-02-01 04:17:07
Message-ID: 14561.1359692227@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
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.

			regards, tom lane


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