On Sat, Jun 15, 2013 at 3:02 AM, Alexander Korotkov <aekorot...@gmail.com>wrote:
> 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) > Attached version of patch has some refactoring and bug fixes. ------ With best regards, Alexander Korotkov.
gin_ordering.2.patch.gz
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