Re: zweidimensionale Statistiken in Postgres

Hi,

I'm not sure why you thought a mailing list on an admin tool would be a
better fit, but it definitely is not. Don't worry, this isn't a big issue
:-)

Anyway, pgsql-hackers is the list you're looking for.

On the patch you'd like to work on, I'd advise you someone else is working
on this. You should read the "WIP: multivariate statistics / proof of
concept" thread on the hackers list. I'm pretty sure you could get some
help from Tomas.

Patches on this topic are of high interest. If I can be of any help, let me
know.

Regards.
Le 5 nov. 2014 18:03, "Katharina Büchse" <katharina(dot)buechse(at)uni-jena(dot)de> a
écrit :

> Hi,
>
> I was unsure to which mailing list to write, in my opinion psql-hackers
> would fit best, but as it is not recommended to write there directly, I'm
> trying here.
> I'm a phd-student at the university of Jena, Thüringen, Germany, in the
> field of data bases, more accurate query optimization.
> I want to implement a system in PostgreSQL that detects column
> correlations and creates statistical data about correlated columns for the
> optimizer. Therefore I need to store two dimensional statistics (especially
> two dimensional histograms) in PostgreSQL. I would like to know where I
> have to "touch" the source code and make changes, so that the PostgreSQL
> optimizer will also take into consideration my statistical data? I also
> need a possibility to extract data from query results (tuple counts and,
> speaking a little inaccurately, the where-part of the query itself). Of
> course I tried to have a look at the PostgreSQL source code, but it's
> impossible to understand everything within a few weeks or even months....
>
> I'd be grateful for any advices.
> Regards,
>
> Katharina
>
> --
> Dipl.-Math. Katharina Büchse
> Friedrich-Schiller-Universität Jena
> Institut für Informatik
> Lehrstuhl für Datenbanken und Informationssysteme
> Ernst-Abbe-Platz 2
> 07743 Jena
> Telefon 03641/946367
> Webseite http://users.minet.uni-jena.de/~re89qen/
>
>
>
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