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Re: bug in join?

From: Laurette Cisneros <laurette(at)nextbus(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: <pgsql-hackers(at)postgreSQL(dot)org>
Subject: Re: bug in join?
Date: 2002-01-03 00:12:53
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Thanks Tom!

On Wed, 2 Jan 2002, Tom Lane wrote:

> Okay, I've been able to reproduce the problem here.  Looks like the
> eqjoinsel math is not wrong, exactly, but small roundoff errors are
> causing the logic to do unreasonable things.  I think
> get_att_numdistinct needs to round its result to an integer, and
> probably there needs to be some clamping of computed probabilities to
> the 0..1 range (otherfreq1 is coming out about -4.4703483581542969e-08
> in this example, which should be clamped to 0).
> Will have a fix late tonight or tomorrow.
> Thanks for the example case!
> 			regards, tom lane

Laurette Cisneros
(510) 420-3137
NextBus Information Systems, Inc.
Passenger Information Everywhere

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