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f576b17cd6
Patch introduces a concept of similarity over string and just a word from another string. Version of extension is not changed because 1.2 was already introduced in 9.6 release cycle, so, there wasn't a public version. Author: Alexander Korotkov, Artur Zakirov
116 lines
4.7 KiB
SQL
116 lines
4.7 KiB
SQL
CREATE EXTENSION pg_trgm;
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select show_trgm('');
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select show_trgm('(*&^$@%@');
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select show_trgm('a b c');
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select show_trgm(' a b c ');
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select show_trgm('aA bB cC');
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select show_trgm(' aA bB cC ');
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select show_trgm('a b C0*%^');
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select similarity('wow','WOWa ');
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select similarity('wow',' WOW ');
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select similarity('---', '####---');
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CREATE TABLE test_trgm(t text COLLATE "C");
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\copy test_trgm from 'data/trgm.data'
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select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
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select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
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select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
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select t <-> 'q0987wertyu0988', t from test_trgm order by t <-> 'q0987wertyu0988' limit 2;
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create index trgm_idx on test_trgm using gist (t gist_trgm_ops);
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set enable_seqscan=off;
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select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
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select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
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select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
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explain (costs off)
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select t <-> 'q0987wertyu0988', t from test_trgm order by t <-> 'q0987wertyu0988' limit 2;
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select t <-> 'q0987wertyu0988', t from test_trgm order by t <-> 'q0987wertyu0988' limit 2;
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drop index trgm_idx;
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create index trgm_idx on test_trgm using gin (t gin_trgm_ops);
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set enable_seqscan=off;
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select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
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select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
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select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
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create table test2(t text COLLATE "C");
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insert into test2 values ('abcdef');
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insert into test2 values ('quark');
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insert into test2 values (' z foo bar');
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create index test2_idx_gin on test2 using gin (t gin_trgm_ops);
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set enable_seqscan=off;
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explain (costs off)
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select * from test2 where t like '%BCD%';
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explain (costs off)
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select * from test2 where t ilike '%BCD%';
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select * from test2 where t like '%BCD%';
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select * from test2 where t like '%bcd%';
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select * from test2 where t like E'%\\bcd%';
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select * from test2 where t ilike '%BCD%';
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select * from test2 where t ilike 'qua%';
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select * from test2 where t like '%z foo bar%';
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select * from test2 where t like ' z foo%';
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explain (costs off)
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select * from test2 where t ~ '[abc]{3}';
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explain (costs off)
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select * from test2 where t ~* 'DEF';
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select * from test2 where t ~ '[abc]{3}';
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select * from test2 where t ~ 'a[bc]+d';
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select * from test2 where t ~ '(abc)*$';
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select * from test2 where t ~* 'DEF';
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select * from test2 where t ~ 'dEf';
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select * from test2 where t ~* '^q';
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select * from test2 where t ~* '[abc]{3}[def]{3}';
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select * from test2 where t ~* 'ab[a-z]{3}';
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select * from test2 where t ~* '(^| )qua';
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select * from test2 where t ~ 'q.*rk$';
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select * from test2 where t ~ 'q';
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select * from test2 where t ~ '[a-z]{3}';
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select * from test2 where t ~* '(a{10}|b{10}|c{10}){10}';
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select * from test2 where t ~ 'z foo bar';
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select * from test2 where t ~ ' z foo bar';
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select * from test2 where t ~ ' z foo bar';
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select * from test2 where t ~ ' z foo';
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drop index test2_idx_gin;
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create index test2_idx_gist on test2 using gist (t gist_trgm_ops);
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set enable_seqscan=off;
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explain (costs off)
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select * from test2 where t like '%BCD%';
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explain (costs off)
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select * from test2 where t ilike '%BCD%';
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select * from test2 where t like '%BCD%';
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select * from test2 where t like '%bcd%';
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select * from test2 where t like E'%\\bcd%';
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select * from test2 where t ilike '%BCD%';
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select * from test2 where t ilike 'qua%';
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select * from test2 where t like '%z foo bar%';
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select * from test2 where t like ' z foo%';
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explain (costs off)
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select * from test2 where t ~ '[abc]{3}';
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explain (costs off)
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select * from test2 where t ~* 'DEF';
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select * from test2 where t ~ '[abc]{3}';
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select * from test2 where t ~ 'a[bc]+d';
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select * from test2 where t ~ '(abc)*$';
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select * from test2 where t ~* 'DEF';
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select * from test2 where t ~ 'dEf';
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select * from test2 where t ~* '^q';
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select * from test2 where t ~* '[abc]{3}[def]{3}';
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select * from test2 where t ~* 'ab[a-z]{3}';
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select * from test2 where t ~* '(^| )qua';
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select * from test2 where t ~ 'q.*rk$';
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select * from test2 where t ~ 'q';
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select * from test2 where t ~ '[a-z]{3}';
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select * from test2 where t ~* '(a{10}|b{10}|c{10}){10}';
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select * from test2 where t ~ 'z foo bar';
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select * from test2 where t ~ ' z foo bar';
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select * from test2 where t ~ ' z foo bar';
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select * from test2 where t ~ ' z foo';
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