| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Bruce Momjian <pgman(at)candle(dot)pha(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 04:56:14 |
| Message-ID: | 29989.1026795374@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
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.
> 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...
regards, tom lane
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