Hi, 2014-11-06 9:57 GMT+01:00 Katharina Büchse <katharina.buec...@uni-jena.de>:
> Thank you for your help! I'll try in pgsql-hackers then :-) > > Good :) > > On 05.11.2014 18:22, Guillaume Lelarge wrote: > > Hi, > > I'm not sure why you thought a mailing list on an admin tool would be a > better fit, > > if nothing fits, you just choose anything ;-) My first try was even > someone from the German mailing list (that's why the subject of the mail > was still German, sorry for that), but after some mail exchange he just > suggested to write to a developer mailing list. So I read all the > descriptions of the mailing lists and it was like "no -- no -- no --- ...." > > I understand the feeling :) It's not easy to choose the good one. > 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.buec...@uni-jena.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/ >> >> >> >> -- >> Sent via pgadmin-hackers mailing list (pgadmin-hackers@postgresql.org) >> To make changes to your subscription: >> http://www.postgresql.org/mailpref/pgadmin-hackers >> > > -- Guillaume. http://blog.guillaume.lelarge.info http://www.dalibo.com
