| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Richard Huxton <dev(at)archonet(dot)com> |
| Cc: | Emil Rachovsky <zsevgymko(at)yahoo(dot)com>, "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>, "pgsql-sql(at)postgresql(dot)org" <pgsql-sql(at)postgresql(dot)org> |
| Subject: | Re: problem with overloading the "coalesce" function |
| Date: | 2006-03-07 02:39:18 |
| Message-ID: | 12236.1141699158@sss.pgh.pa.us |
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| Lists: | pgsql-general pgsql-sql |
Richard Huxton <dev(at)archonet(dot)com> writes:
> Hmm - looking at the source (and \df in psql) it seems the basic problem
> is that COALESCE() isn't a function.
If it were an ordinary function, it couldn't satisfy the property of not
evaluating "unused" arguments ...
regards, tom lane
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