From: Fernando Hevia <fhevia@ip-tel.com.ar>
To: 'Tom Lane' <tgl@sss.pgh.pa.us>
Cc: 'SQL Postgresql List' <pgsql-sql@postgresql.org>
Subject: Re: Function Volatility
Date: Mon, 10 Sep 2007 10:47:34 -0300
Message-ID: <019801c7f3b1$240cfb60$8f01010a@iptel.com.ar> (raw)
In-Reply-To: <15490.1189390524@sss.pgh.pa.us>
Tom Lane writes:
> The IMMUTABLE marker is a promise from you to the system that it is safe
> to optimize away multiple calls to the function. It is not a promise
> from the system to you that the system will expend unlimited amounts of
> energy to detect duplicate calls.
Nicely put. Thanks!
BTW, this explanation should go into the manual.
Regards,
Fernando.
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To: pgsql-sql@postgresql.org
Cc: fhevia@ip-tel.com.ar, tgl@sss.pgh.pa.us
Subject: Re: Function Volatility
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