From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Greg Stark <gsstark(at)mit(dot)edu> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: ADD/DROP INHERITS |
Date: | 2006-06-07 19:41:54 |
Message-ID: | 16749.1149709314@sss.pgh.pa.us |
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Greg Stark <gsstark(at)mit(dot)edu> writes:
> Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:
>> I thought we had agreed that the semantics of ADD INHERITS would be to
>> reject the command if the child wasn't already suitable to be a child
>> of the parent.
> I didn't see any discussion like that and I find it pretty surprising.
I'm pretty sure it was mentioned somewhere along the line.
> But that's entirely inconsistent with the way inherited tables work in
> general.
I don't see any basis for that conclusion. The properties of a table
are set when it's created and you need to do pretty explicit ALTERs to
change them. We do not for example automatically make a unique index
for a table when someone tries to reference a foreign key to a column
set that doesn't already have such an index.
In this situation, I think it's entirely reasonable to expect the user
to do any needed ALTER ADD COLUMN, CONSTRAINT, etc commands before
trying to attach a child table to a parent. Having the system do it
for you offers no functionality gain, just a way to shoot yourself in
the foot.
regards, tom lane
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