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help / color / mirror / Atom feedFrom: Tom Lane <tgl@sss.pgh.pa.us>
To: Desmond Coertzen <patrolliekaptein@gmail.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Subselect left join / not exists()
Date: Mon, 14 Mar 2016 09:42:41 -0400
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Desmond Coertzen <patrolliekaptein@gmail.com> writes:
> I was under the impression that postgres will not allow me to declare a
> function immutable if it falls outside of the bounds of the definition.
IIRC, there was an explicit decision not to throw errors for "immutable
function reads a table", because we have no way to be sure that such a
thing might not be safe in practice in a particular usage. (That is,
you actually don't ever change the table's contents after first use of
the function.) But yeah, it's a gray area.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, patrolliekaptein@gmail.com
Subject: Re: Subselect left join / not exists()
In-Reply-To: <30076.1457962961@sss.pgh.pa.us>
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