From: | Yeb Havinga <yebhavinga(at)gmail(dot)com> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Henk Enting <h(dot)d(dot)enting(at)mgrid(dot)net>, pgsql-hackers(at)postgresql(dot)org, KaiGai Kohei <kaigai(at)ak(dot)jp(dot)nec(dot)com> |
Subject: | Re: tracking inherited columns (was: patch for check constraints using multiple inheritance) |
Date: | 2010-08-04 10:41:24 |
Message-ID: | 4C5943D4.2070306@gmail.com |
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Lists: | pgsql-hackers |
Robert Haas wrote:
> On Wed, Aug 4, 2010 at 3:48 AM, Yeb Havinga <yebhavinga(at)gmail(dot)com> wrote:
>
>> I just read that thread. In the beginning there is a short discussion what
>> the non-astonishing behaviour of the RENAME in the case of multiple origin
>> inheritance should be, which is preventing renames or any property change in
>> that case. I think we should explore the possibilty of allowing the RENAME
>> more.
>>
>
> If child inherits column A from parent1 and parent2, and it is then
> renamed to B in parent2, what should the name be in the child after
> the rename is completed?
>
The column should be renamed to B in parent2, child and parent1.
> For bonus points, how should pg_dump handle this to make sure the
> state after a dump and reload matches the state before the dump and
> reload?
>
If the change happens in a single transaction there should be no
problems here, as opposed to e.g. have the user issue two renames. Did I
get the bonus points? :-)
regards,
Yeb Havinga
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