From: Tom Lane <tgl@sss.pgh.pa.us>
To: Dean Rasheed <dean.a.rasheed@gmail.com>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: Alexander Korotkov <a.korotkov@postgrespro.ru>
Cc: Mark Dilger <hornschnorter@gmail.com>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: improving GROUP BY estimation
Date: Sat, 02 Apr 2016 10:59:16 -0400
Message-ID: <31529.1459609156@sss.pgh.pa.us> (raw)
In-Reply-To: <CAEZATCVkTeN6fLvhcp=0EeKK091NCyOcO1mh9Znnk5GQp=N1+w@mail.gmail.com>
References: <20160331205118.GA166096@alvherre.pgsql>
<8033.1459458176@sss.pgh.pa.us>
<CAEZATCVkTeN6fLvhcp=0EeKK091NCyOcO1mh9Znnk5GQp=N1+w@mail.gmail.com>
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Dean Rasheed <dean.a.rasheed@gmail.com> writes:
> Here's an updated patch with references to both papers, and a more
> detailed justification for the formula, along with the other changes
> discussed. Note that although equation (2) in the Dell'Era paper looks
> different from the Yao formula, it's actually the same.
Looks good to me.
regards, tom lane
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Cc: tgl@sss.pgh.pa.us, dean.a.rasheed@gmail.com, alvherre@2ndquadrant.com, tomas.vondra@2ndquadrant.com, a.korotkov@postgrespro.ru, hornschnorter@gmail.com
Subject: Re: improving GROUP BY estimation
In-Reply-To: <31529.1459609156@sss.pgh.pa.us>
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