| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Andrew Dunstan <andrew(at)dunslane(dot)net>, Takahiro Itagaki <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, Kjell Rune Skaaraas <kjella79(at)yahoo(dot)no>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Add column if not exists (CINE) |
| Date: | 2010-04-28 16:31:09 |
| Message-ID: | 13579.1272472269@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> Actually, that's a good idea. But how will you handle tables?
Well, tables are a special case, mainly because it's not clear how to
avoid accidentally throwing away data. (In particular if some column in
the existing table isn't there in the new definition. It's a bit scary
to just drop the column, IMO.) I don't see that that argument applies
to doing an automatic ALTER COLUMN, though, especially since the only
column type alterations that will go through without a USING clause are
reasonably straightforward.
regards, tom lane
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