Horton

Re: Need a mentor, and a project.

Bruce Momjian <bruce@momjian.us>

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From: Bruce Momjian <bruce@momjian.us>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Ashish <abindra@u.washington.edu>, Josh Berkus <josh@agliodbs.com>, Joshua Tolley <eggyknap@gmail.com>, Albe Laurenz <laurenz.albe@wien.gv.at>, pgsql-hackers@postgresql.org
Date: 2009-12-12T02:36:55Z
Lists: pgsql-hackers 
Robert Haas wrote:
> On Fri, Dec 11, 2009 at 9:05 PM, Bruce Momjian <bruce@momjian.us> wrote:
> > Ashish wrote:
> >> I am thinking about starting with the following TODO item:
> >>
> >> --> Have EXPLAIN ANALYZE issue NOTICE messages when the estimated
> >> and actual row counts differ by a specified percentage.
> >>
> >> I picked this because it is somewhat related to query processing
> >> which is what I am most interested in. It also <seems> like a
> >> good start up project for a newbie like me. Before I start
> >> looking into what this would involve and start a conversation
> >> on designing a solution - I wanted to know what you guys think
> >> about this particular TODO, and it suitability to a newbie.
> >> Looking forward to your comments...
> >
> > I even have a sample patch you can use as a start, attached.
> 
> Interesting.  The logic in ExplainVariance() doesn't look right to me
> - the cases where one argument is zero seem like they will produce a
> differently-scaled result than otherwise.

Yea, it is just a starting point for him.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +