Hi, On 2014-01-14 18:10:40 +0900, Kyotaro HORIGUCHI wrote: > This is cont'd from CF3. > > http://www.postgresql.org/message-id/20131122.165927.27412386.horiguchi.kyot...@lab.ntt.co.jp > > The issue in brief is that UNION is never flattened differently > to UNION ALL so UNION cannot make use of index scan even if > usable. > > This patch flattens UNION likewise currently did for UNION ALL. > > This patch needs another 'UNION ALL' patch and further gain with > even another 'Widening application of indices' patch. ('Ready for > Commit' now in CF3..) > > http://www.postgresql.org/message-id/20140114.180447.145186052.horiguchi.kyot...@lab.ntt.co.jp > http://www.postgresql.org/message-id/20140114.180810.122352231.horiguchi.kyot...@lab.ntt.co.jp > > > You can see the detailed outlines in the message at here, > > http://www.postgresql.org/message-id/20131031.194251.12577697.horiguchi.kyot...@lab.ntt.co.jp > > The attached patche is rebased to current 9.4dev HEAD and make > check at the topmost directory and src/test/isolation are passed > without error.
I haven't really followed this topic, so please excuse my ignorance. This is still marked as "needs review" in https://commitfest.postgresql.org/action/patch_view?id=1374 . But I am not sure the patch as is is relevant after a87c729153e372f3731689a7be007bc2b53f1410? Greetings, Andres Freund -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
