From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Bruce Momjian <bruce@momjian.us>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Subject: Re: multivariate statistics v8
Date: Wed, 20 Jan 2016 18:54:16 -0300
Message-ID: <20160120215416.GA378214@alvherre.pgsql> (raw)
In-Reply-To: <20160120213743.GA9092@momjian.us>
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Bruce Momjian wrote:
> On Wed, Jan 20, 2016 at 02:20:38PM -0500, Robert Haas wrote:
> > On Wed, Dec 23, 2015 at 2:07 PM, Tomas Vondra
> > <tomas.vondra@2ndquadrant.com> wrote:
> > > The remaining question is how unique the statistics name should be.
> > > My initial plan was to make it unique within a table, but that of
> > > course does not work well with the DROP STATISTICS (it'd have to
> > > specify the table name also), and it'd also now work with statistics
> > > on multiple tables (which is one of the reasons for abandoning ALTER
> > > TABLE stuff).
> > >
> > > So I think it should be unique across tables. Statistics are hardly
> > > a global object, so it should be unique within a schema. I thought
> > > that simply using the schema of the table would work, but that of
> > > course breaks with multiple tables in different schemas. So the only
> > > solution seems to be explicit schema for statistics.
> >
> > That solution seems good to me.
> >
> > (with apologies for not having looked at the rest of this much at all)
>
> Woh, this will be an optimizer game-changer, from the user perspective!
That is the intent. The patch is huge, though -- any reviewing help is
welcome.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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Cc: alvherre@2ndquadrant.com, bruce@momjian.us, robertmhaas@gmail.com, tomas.vondra@2ndquadrant.com
Subject: Re: multivariate statistics v8
In-Reply-To: <20160120215416.GA378214@alvherre.pgsql>
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