Ian Barwick <barw...@gmail.com> writes: > Apologies, slight c&p error; correct version of query:
> SELECT ov.object_id > FROM object_version ov > WHERE ov.object_id = 1 > AND ov.version =0 > AND ov.object_status_id = ( > SELECT MAX(ov1.object_status_id) > FROM object_version ov1 > WHERE ov1.object_id=ov.object_id > AND ov1.version = ov.version > AND ov1.lang = ov.lang > ) > AND ov.lang = 'en'; Ah, I see it: -> Index Scan Backward using object_version_object_id_version_object_status_id_lang_key on object_version ov1 (cost=0.00..8.27 rows=1 width=4) Index Cond: ((object_id = $0) AND (version = $1) AND (lang = $2) AND (object_status_id IS NOT NULL)) where regression=# \d object_version_object_id_version_object_status_id_lang_key Index "public.object_version_object_id_version_object_status_id_lang_key" Column | Type | Definition ------------------+--------------+------------------ object_id | integer | object_id version | integer | version object_status_id | integer | object_status_id lang | character(2) | lang unique, btree, for table "public.object_version" The index-based-max code is throwing in the IS NOT NULL condition without thought for where it has to go in the index condition order. Will look into fixing this tomorrow. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers