From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
---|---|
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 04:02:35 |
Message-ID: | CAFj8pRBsTLbOivQ-hWiZrHSvwN84D62afCQ+dLWptAFy+g8wNw@mail.gmail.com |
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Lists: | pgsql-hackers |
hello
2013/2/1 Andrew Dunstan <andrew(at)dunslane(dot)net>:
>
> 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.
>
you can look into parser tree
see src of get_fn_expr_argtype(fcinfo->flinfo, 0);
Regards
Pavel
> cheers
>
> andrew
>
>
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