From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>, Rod Taylor <rbt(at)zort(dot)ca>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: DROP COLUMN |
Date: | 2002-07-16 04:58:50 |
Message-ID: | 200207160458.g6G4wo907978@candle.pha.pa.us |
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Lists: | pgsql-hackers |
Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > Tom Lane wrote:
> >> Definitely *not*; I don't want to kluge up every call to SearchSysCache
> >> with a feature that's only relevant to a small number of them.
>
> > Uh, then what?
>
> Then we make a wrapper function. Something like
>
> GetUndeletedColumnByName(relid,attname)
>
> replaces SearchSysCache(ATTNAME,...) in those places where you don't
> want to see deleted columns. It'd return NULL if it finds a column
> tuple but sees it's deleted.
>
> GetUndeletedColumnByNum(relid,attnum)
>
> replaces SearchSysCache(ATTNUM,...) similarly.
Good idea.
> > My only other idea is to make a syscache that is like ATTNAME except
> > that it doesn't return a dropped column.
>
> That would mean duplicate storage of tuples inside the catcache...
No, I was thinking of something that did the normal ATTNAME lookup in
the syscache code, then returned NULL on dropped columns; similar to
your idea but done inside the syscache code rather than in a separate
function.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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