On Fri, Apr 4, 2014 at 11:56 AM, Костя Кузнецов <chapae...@yandex.ru> wrote: > I want to implement knn for spgist. I dont have question with knn, but have > questions with implementation of interface. > > i modify pg_am.h (set amcanorderbyop to true in spgist index).Also i modify > pg_amop.h(add > > DATA(insert ( 4015 600 600 15 o 517 4000 1970 )); > > ) > > explain SELECT * FROM quad_point_tbl ORDER BY p <-> '-2,50' > > Sort (cost=1219.31..1246.82 rows=11003 width=16) > Sort Key: ((p <-> '(-2,50)'::point)) > -> Index Only Scan using sp_quad_ind on quad_point_tbl > (cost=0.15..480.70 r > ows=11003 width=16) > what am I doing wrong?
I don't know. I think there are a lot of possibilities based on the information provided. A simple explanation would be that the planner considered the plan you want and found the other one cheaper, but the real cause could well be something else. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
