Hackers, attached patch implementing ordering inside GIN index. This is third patch of GIN improvements, see previous two: http://www.postgresql.org/message-id/capphfduxv-il7aedwpw0w5fxrwgakfxijwm63_hzujacrxn...@mail.gmail.com http://www.postgresql.org/message-id/CAPpHfdvftaJq7www381naLw1=4u0h+qpxgwvnhceb9hmvyw...@mail.gmail.com
This patch introduces new interface method of GIN which takes same arguments as consistent but returns float8. float8 gin_ordering(bool check[], StrategyNumber n, Datum query, int32 nkeys, Pointer extra_data[], bool *recheck, Datum queryKeys[], bool nullFlags[], Datum addInfo[], bool addInfoIsNull[]) This patch implements gingettuple method which can return ordering data using KNN infrastructure. Also it introduces >< operator for fts which support ordering in GIN index. Some example: postgres=# explain analyze select * from dblp_titles2 where tsvector @@ to_tsquery('english', 'statistics') order by tsvector >< to_tsquery('english', 'statistics') limit 10; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=12.00..48.22 rows=10 width=136) (actual time=6.999..7.120 rows=10 loops=1) -> Index Scan using dblp_titles2_idx on dblp_titles2 (cost=12.00..43003.03 rows=11868 width=136) (actual time=6.996..7.115 rows=10 loops=1) Index Cond: (tsvector @@ '''statist'''::tsquery) Order By: (tsvector >< '''statist'''::tsquery) Total runtime: 7.556 ms (5 rows) ------ With best regards, Alexander Korotkov.