Re: New manual chapters - Mailing list pgsql-hackers

From Christopher Kings-Lynne
Subject Re: New manual chapters
Date
Msg-id GNELIHDDFBOCMGBFGEFOCEIJCDAA.chriskl@familyhealth.com.au
Whole thread Raw
In response to Re: New manual chapters  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: New manual chapters  (Hannu Krosing <hannu@tm.ee>)
List pgsql-hackers
> But we *have* drop column.

I know that....I think I must have been on crazy pills when I mentioned it
in regards to DROP COLUMN...

> If we don't do attlognum for 7.3, there's little point in doing it at
> all.  By the time 7.4 comes out, clients that formerly expected a
> consecutive series of attnums will have found some way to cope.

I think that what Hannu is saying is that if we implemented changing column
type with a drop and an add, all queries that used to go 'select * from'
would return the modified column at the end of the list of columns instead
of in its original position.

> I'm not sure that I feel any strong sense of urgency about this ---
> 7.3 will break clients that examine the system catalogs in many ways,
> and this doesn't seem like the nastiest of 'em.
>
> I just wanted to point out that "we'll do it later" isn't a profitable
> attitude towards attlognum.  Either it's done by the end of August,
> or it never gets done at all.

Ok - don't know if I'll be able to tho.

Chris



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