On Thu, Nov 21, 2013 at 5:12 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> Ken Tanzer <ken.tan...@gmail.com> writes: > > Hello. In doing a left join with a particular view as the right table, > and > > non-matching join criteria, I am getting values returned in a few fields. > > All the rest are NULL. I would expect all the right side values to be > > NULL. > > Hmmm ... the join conditions involving COALESCE() remind me of a bug I > just fixed last week. Are you in a position to try a patch? If so, > here's the fix against 9.2: > > http://git.postgresql.org/gitweb/?p=postgresql.git;a=patch;h=51b6ae6bba75bca2374a24cf7c740da74c955ad5 > > If that doesn't help, please see if you can extract a self-contained > test case. Getting a build environment together seemed more painful, so here's a test case. Just for fun, I tried this in another database on a different machine (and with 9.0.08). I got the same results, so it doesn't seem to be a case of something wacky with my particular database. Cheers, Ken p.s., Not your problem I know, but I need to deal with this somehow and rather soon. If the patch you mentioned does fix this, and that's the easiest way to get this fixed on my machine, please do let me know and I'll start googling Postgres build source. Thanks! DROP VIEW IF EXISTS boo_top_view; DROP VIEW IF EXISTS boo_view; DROP TABLE IF EXISTS boo_table; DROP TABLE IF EXISTS a_table; CREATE TABLE boo_table ( client_id INTEGER); CREATE TABLE a_table ( client_id INTEGER ); CREATE OR REPLACE VIEW boo_view AS SELECT r1.client_id, 666 AS my_field FROM boo_table r1; CREATE OR REPLACE VIEW boo_top_view AS SELECT client_id, my_field FROM ( SELECT a.client_id, a.my_field FROM boo_view AS a ) foo --Problem goes away if you take out this left join LEFT JOIN ( SELECT client_id FROM a_table ) a2 USING (client_id); SELECT foo.client_id AS foo_id,boo.client_id AS ri_id,my_field from (SELECT -1 AS client_id) foo LEFT JOIN boo_top_view boo USING (client_id); foo_id | ri_id | my_field --------+-------+---------- -1 | | 666 > -- AGENCY Software A data system that puts you in control 100% Free Software *http://agency-software.org/ <http://agency-software.org/>* ken.tan...@agency-software.org (253) 245-3801 Subscribe to the mailing list<agency-general-requ...@lists.sourceforge.net?body=subscribe> to learn more about AGENCY or follow the discussion.
