| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Ashish <abindra(at)u(dot)washington(dot)edu>, Josh Berkus <josh(at)agliodbs(dot)com>, Joshua Tolley <eggyknap(at)gmail(dot)com>, Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Need a mentor, and a project. |
| Date: | 2009-12-12 02:30:20 |
| Message-ID: | 603c8f070912111830s1929d559m59a9ae81dac5f9b8@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Dec 11, 2009 at 9:05 PM, Bruce Momjian <bruce(at)momjian(dot)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.
...Robert
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