Re: function side effects

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Peter Eisentraut <peter_e(at)gmx(dot)net>
Cc: Jaime Casanova <jcasanov(at)systemguards(dot)com(dot)ec>, Greg Stark <gsstark(at)mit(dot)edu>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Tatsuo Ishii <ishii(at)postgresql(dot)org>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: function side effects
Date: 2010-03-01 21:29:56
Message-ID: 24513.1267478996@sss.pgh.pa.us
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Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
> SQL standard:

> <SQL-data access indication> ::=
> NO SQL
> | CONTAINS SQL
> | READS SQL DATA
> | MODIFIES SQL DATA

Huh. I understand three of those, but what is the use of CONTAINS SQL?
Seems like that would have to be the same as the last one, or maybe
the next-to-last one if you're prepared to assume it's read-only SQL.

regards, tom lane

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