| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com> |
| Cc: | "Gregory Stark" <stark(at)enterprisedb(dot)com>, "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com>, "Pavan Deolasee" <pavan(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: HOT patch, missing things |
| Date: | 2007-08-14 14:07:57 |
| Message-ID: | 18229.1187100477@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
"Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com> writes:
> I am trying to figure out the best way to extract this information. Is there
> any
> existing code to get all attributes used in the expressions ? Or do I need
> to walk the tree and extract that information ?
There are a number of near matches in backend/optimizer/util/var.c,
but nothing that has exactly the API you probably want, which I'd think
would be to extract a bitmapset of the varattnos of level-zero Vars.
contain_var_reference() could be used repeatedly but that seems
tremendously inefficient. I'd suggest coding up some new function
using what's there for reference.
regards, tom lane
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