Kyotaro HORIGUCHI wrote: > Hello, I've totally refactored the series of patches and cut out the appropriate portion as 'unique (and non-nullable) index stuff'.
> As the discussion before, it got rid of path distinctness. This patch works only on index 'full-orederedness', i.e., unique index on non-nullable columns. This is interesting! I took a quick look at the patch. Here is my initial comment. I don't think it's so good to set the pathkeys of a unique-index path to query_pathkeys after the scan/join optimization because it can't exploit the full-orderedness property in implementing mergejoins, i.e., it can't skip doing an explicit sort that is considered unnecessary from the property. So, I think the path's pathkeys should be set to query_pathkeys before the scan/join optimization, i.e., at the index-path creation time. If you wouldn't mind, I'd like to rework on the patch. Thanks, Best regards, Etsuro Fujita -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
