diff options
Diffstat (limited to 'contrib/pg_trgm/sql/pg_word_trgm.sql')
-rw-r--r-- | contrib/pg_trgm/sql/pg_word_trgm.sql | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/contrib/pg_trgm/sql/pg_word_trgm.sql b/contrib/pg_trgm/sql/pg_word_trgm.sql new file mode 100644 index 0000000..d2ada49 --- /dev/null +++ b/contrib/pg_trgm/sql/pg_word_trgm.sql @@ -0,0 +1,48 @@ +CREATE TABLE test_trgm2(t text COLLATE "C"); + +\copy test_trgm2 from 'data/trgm2.data' + +-- reduce noise +set extra_float_digits = 0; + +select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t; +select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t; +select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t; +select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t; +select t <->> 'Kabankala', t from test_trgm2 order by t <->> 'Kabankala' limit 7; + +create index trgm_idx2 on test_trgm2 using gist (t gist_trgm_ops); +set enable_seqscan=off; + +select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t; +select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t; +select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t; +select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t; + +explain (costs off) +select t <->> 'Kabankala', t from test_trgm2 order by t <->> 'Kabankala' limit 7; +select t <->> 'Kabankala', t from test_trgm2 order by t <->> 'Kabankala' limit 7; + +drop index trgm_idx2; +create index trgm_idx2 on test_trgm2 using gin (t gin_trgm_ops); +set enable_seqscan=off; + +select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t; +select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t; +select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t; +select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t; + +set "pg_trgm.word_similarity_threshold" to 0.5; +select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t; +select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t; +select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t; +select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t; + +set "pg_trgm.word_similarity_threshold" to 0.3; +select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t; +select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t; +select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t; +select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t; + +-- test unsatisfiable pattern +select * from test_trgm2 where t ~ '.*$x'; |