| From: | Greg Stark <gsstark(at)mit(dot)edu> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Greg Stark <gsstark(at)mit(dot)edu>, Martijn van Oosterhout <kleptog(at)svana(dot)org>, Hannu Krosing <hannu(at)skype(dot)net>, Simon Riggs <simon(at)2ndquadrant(dot)com>, "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: effective SELECT from child tables |
| Date: | 2005-10-03 05:35:59 |
| Message-ID: | 87ek73b1s0.fsf@stark.xeocode.com |
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| Lists: | pgsql-hackers |
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:
> Here's another interesting case to think about:
>
> ALTER TABLE ADD foo integer DEFAULT 1
> ...
> ALTER TABLE ALTER foo SET DEFAULT 2
>
> You'll have to pay the table-traversal cost on one step or the other.
A good point.
I wonder if this could be solved by recording the xid of the ALTER transaction
along with the default value. I imagine that might get complicated quickly
though.
--
greg
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