From: Tom Lane <tgl@sss.pgh.pa.us>
To: Frazer McLean <frazer@frazermclean.co.uk>
Cc: pgsql-general@postgresql.org
Subject: Re: Unexpected interval comparison
Date: Tue, 21 Mar 2017 10:42:16 -0400
Message-ID: <30765.1490107336@sss.pgh.pa.us> (raw)
In-Reply-To: <1490104629.422698.918452336.26FA96B7@webmail.messagingengine.com>
References: <1490104629.422698.918452336.26FA96B7@webmail.messagingengine.com>
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Frazer McLean <frazer@frazermclean.co.uk> writes:
> I came across an unexpected comparison (tested on PostgreSQL 9.4 and
> 9.6) for intervals with a large difference in magnitude.
> '1 year'::interval > '32618665 years'::interval;
> Is this a bug?
It looks like the problem is overflow of the result of interval_cmp_value,
because it's trying to compute
=# select '32618665'::int8 * 30 * 86400 * 1000000;
ERROR: bigint out of range
It's not immediately obvious how to avoid that while preserving the same
comparison semantics :-(
regards, tom lane
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To: pgsql-general@postgresql.org
Cc: tgl@sss.pgh.pa.us, frazer@frazermclean.co.uk
Subject: Re: Unexpected interval comparison
In-Reply-To: <30765.1490107336@sss.pgh.pa.us>
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