>> Do you have any other missing parts in this work? I am asking >> because I wonder if you want to push this into 9.6 or rather 9.7. > > I think the first few parts of the patch series, namely: > > * shared infrastructure (0002) > * functional dependencies (0003) > * MCV lists (0004) > * histograms (0005) > > might make it into 9.6. I believe the code for building and storing > the different kinds of stats is reasonably solid. What probably needs > more thorough review are the changes in clauselist_selectivity(), but > the code in these parts is reasonably simple as it only supports using > a single multi-variate statistics per relation. > > The part (0006) that allows using multiple statistics (i.e. selects > which of the available stats to use and in what order) is probably the > most complex part of the whole patch, and I myself do have some > questions about some aspects of it. I don't think this part might get > into 9.6 at this point (although it'd be nice if we managed to do > that).
Hum. So without 0006 or beyond, there's not much benefit for the PostgreSQL users, and you are not too confident about 0006 or beyond. Then I would think it is a little bit hard to justify in putting 000[2-5] into 9.6. I really like this feature and would like to see in PostgreSQL someday, but I'm not sure if we should put the patches (0002-0005) into PostgreSQL now. Please let me know if there's some reaons we should put the patches into PostgreSQL now. Best regards, -- Tatsuo Ishii SRA OSS, Inc. Japan English: http://www.sraoss.co.jp/index_en.php Japanese:http://www.sraoss.co.jp -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
