Re: alter table drop column

Added to TODO.detail/drop.

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> 
> I read the transcript of the alter table drop column discussion (old
> discussion) at http://www.postgresql.org/docs/pgsql/doc/TODO.detail/drop,
> and I have something to add:
> 
> People mentioned such ideas as a hidden column and a really deleted column,
> and it occurred to me that perhaps "vacuum" would be a good option to use.
> When a delete was issued, the column would be hidden (by a negative/invalid
> logical column number, it appears was the consensus). Upon issuing a
> vacuum, it could perform a complete deletion. This method would allow users
> to know that the process may take a while (I think the agreed method for a
> complete delete was to "select into..." the right columns and leave out the
> deleted ones, then delete the old table).
> 
> Furthermore, I liked the idea of some kind of "undelete", as long as it was
> just hidden. This could apply to anything that is cleaned out with a vacuum
> (before it is cleaned out), although I am not sure how feasible this is,
> and it isn't particularly important to me.
> 
> Regards,
>     Jeff
> 
> -- 
> Jeff Davis
> Dynamic Works
> jdavis@dynworks.com
> http://dynworks.com
> 
> 


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