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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Dean Rasheed <dean.a.rasheed@gmail.com>
Cc: Madeleine Thompson <madeleineth@gmail.com>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Subject: Re: BUG #15307: Low numerical precision of (Co-) Variance
Date: Wed, 03 Oct 2018 10:21:14 -0400
Message-ID: <9447.1538576474@sss.pgh.pa.us> (raw)
In-Reply-To: <CAEZATCXtF7-Cxeb2-adzqDwqiShcahQX5rivwzckzq_x8=__3Q@mail.gmail.com>
References: <153313051300.1397.9594490737341194671@wrigleys.postgresql.org>
	<CAEZATCXRXn40RJjwfSz0FoJfHAX9Y6gwYB2HdL30KVE8ozwCyA@mail.gmail.com>
	<153802514313.25845.6696084477831363882.pgcf@coridan.postgresql.org>
	<CAEZATCVgwHdXQPwihqjpFOit9_KuUaP9ZYdRb0HV4+-bwj1p0A@mail.gmail.com>
	<CAEZATCXtF7-Cxeb2-adzqDwqiShcahQX5rivwzckzq_x8=__3Q@mail.gmail.com>

Dean Rasheed <dean.a.rasheed@gmail.com> writes:
> The next question is whether or not to back-patch this. Although this
> was reported as a bug, my inclination is to apply this to HEAD only,
> based on the lack of prior complaints. That also matches our decision
> for other similar patches, e.g., 7d9a4737c2.

+1 for no back-patch.  Even though the new results are hopefully more
accurate, they're still different from before, and that might cause
issues for somebody if it happens in a stable branch.

			regards, tom lane




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