| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | David Fetter <david(at)fetter(dot)org> |
| Cc: | pgsql-hackers(at)postgresql(dot)org, Greg Sabino Mullane <greg(at)turnstep(dot)com>, pgsql-patches(at)postgresql(dot)org |
| Subject: | Re: New variable server_version_num |
| Date: | 2006-07-30 15:27:33 |
| Message-ID: | 25385.1154273253@sss.pgh.pa.us |
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| Lists: | pgsql-general pgsql-hackers pgsql-patches |
David Fetter <david(at)fetter(dot)org> writes:
> On Sat, Jul 29, 2006 at 09:44:10PM -0400, Tom Lane wrote:
>> The correct solution is for client-side libraries to provide the
>> feature.
> Not if the app is written in SQL, as the bootstrap, regression test,
> etc. code for modules frequently is.
SQL doesn't really have any conditional ability strong enough to deal
with existence or non-existence of features. What are you hoping to
do, a CASE expression? Both arms of the CASE still have to parse,
so I remain unconvinced that there are real world uses.
regards, tom lane
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