On Thu, 29 Jul 2010, Tom Lane wrote:
Oleg Bartunov <o...@sai.msu.su> writes:
I also wonder why did I get "right" result :) Just repeated the query:
test=# select count(*) from search_tab where (to_tsvector('german', keywords ) @@
to_tsquery('german', 'ee:* & dd:*'));
count
-------
123
(1 row)
Yeah, that case works (though I think it's unnecessarily slow). The one
that gives the wrong answer is the equivalent form with two AND'ed @@
operators.
hmm, that query works too :)
test=# select count(*) from search_tab where (to_tsvector('german', keywords )
@@ to_tsquery('german', 'ee:*')) and (to_tsvector('german', keywords ) @@
to_tsquery('german', 'dd:*'));
count
-------
123
(1 row)
Time: 26.155 ms
test=# explain analyze select count(*) from search_tab where
(to_tsvector('german', keywords ) @@ to_tsquery('german', 'ee:*')) and
(to_tsvector('german', keywords ) @@ to_tsquery('german', 'dd:*'));
QUERY PLAN
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Aggregate (cost=103.87..103.88 rows=1 width=0) (actual time=22.819..22.820
rows=1 loops=1)
-> Bitmap Heap Scan on search_tab (cost=5.21..103.80 rows=25 width=0)
(actual time=22.677..22.799 rows=123 loops=1)
Recheck Cond: ((to_tsvector('german'::regconfig, keywords) @@
'''ee'':*'::tsquery) AND (to_tsvector('german'::regconfig, keywords) @@
'''dd'':*'::tsquery))
-> Bitmap Index Scan on idx_keywords_ger (cost=0.00..5.21 rows=25
width=0) (actual time=22.655..22.655 rows=123 loops=1)
Index Cond: ((to_tsvector('german'::regconfig, keywords) @@
'''ee'':*'::tsquery) AND (to_tsvector('german'::regconfig, keywords) @@
'''dd'':*'::tsquery))
Total runtime: 22.865 ms
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: o...@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
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