| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Rod Taylor <rbt(at)rbt(dot)ca> |
| Cc: | Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl>, PostgreSQL Development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: add column .. default |
| Date: | 2003-06-19 14:42:52 |
| Message-ID: | 8726.1056033772@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Rod Taylor <rbt(at)rbt(dot)ca> writes:
> On Thu, 2003-06-19 at 10:05, Alvaro Herrera wrote:
>> Sorry, I haven't read the spec, but what happens when there is a default
>> value already and it's not NULL? Are tuples where column =3D default
>> updated? Are tuples where column IS NULL updated?
> We're talking about add column. Since it's a new column, there will
> never be a default and all entries are NULL in PostgreSQL.
That's an overly simplistic analysis, given that the column may already
exist in child tables. I am not sure that the behavior is fully
consistent even now in such cases, but we at least should make certain
it doesn't become less consistent.
regards, tom lane
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