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Re: problem with overloading the "coalesce" function - Mailing list pgsql-general

From Tom Lane
Subject Re: problem with overloading the "coalesce" function
Date
Msg-id 12236.1141699158@sss.pgh.pa.us
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In response to Re: problem with overloading the "coalesce" function  (Richard Huxton <dev@archonet.com>)
List pgsql-general
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Richard Huxton <dev@archonet.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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