mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-07-13 11:16:14 +02:00
9c852566a3
There was some very strange code here, dating to commitb525bf77, that purported to work around an ancient gcc bug by forcing a float4 comparison to be done as int instead. Commit5871b8848broke that when it changed one side of the comparison to "double" but left the comparison code alone. Commitf576b17cddoubled down on the weirdness by introducing a "volatile" marker, which had nothing to do with the actual problem. Guess that the gcc bug, even if it's still present in the wild, was triggered by comparison of float4's and can be avoided if we store the result of cnt_sml() into a double before comparing to the double "nlimit". This will at least work correctly on non-broken compilers, and it's way more readable. Per bug #14202 from Greg Navis. Add a regression test based on his example. Report: <20160620115321.5792.10766@wrigleys.postgresql.org>
137 lines
5.5 KiB
SQL
137 lines
5.5 KiB
SQL
CREATE EXTENSION pg_trgm;
|
|
|
|
select show_trgm('');
|
|
select show_trgm('(*&^$@%@');
|
|
select show_trgm('a b c');
|
|
select show_trgm(' a b c ');
|
|
select show_trgm('aA bB cC');
|
|
select show_trgm(' aA bB cC ');
|
|
select show_trgm('a b C0*%^');
|
|
|
|
select similarity('wow','WOWa ');
|
|
select similarity('wow',' WOW ');
|
|
|
|
select similarity('---', '####---');
|
|
|
|
CREATE TABLE test_trgm(t text COLLATE "C");
|
|
|
|
\copy test_trgm from 'data/trgm.data'
|
|
|
|
select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
|
|
select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
|
|
select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
|
|
select t <-> 'q0987wertyu0988', t from test_trgm order by t <-> 'q0987wertyu0988' limit 2;
|
|
|
|
create index trgm_idx on test_trgm using gist (t gist_trgm_ops);
|
|
set enable_seqscan=off;
|
|
|
|
select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
|
|
select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
|
|
select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
|
|
explain (costs off)
|
|
select t <-> 'q0987wertyu0988', t from test_trgm order by t <-> 'q0987wertyu0988' limit 2;
|
|
select t <-> 'q0987wertyu0988', t from test_trgm order by t <-> 'q0987wertyu0988' limit 2;
|
|
|
|
drop index trgm_idx;
|
|
create index trgm_idx on test_trgm using gin (t gin_trgm_ops);
|
|
set enable_seqscan=off;
|
|
|
|
select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
|
|
select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
|
|
select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
|
|
|
|
create table test2(t text COLLATE "C");
|
|
insert into test2 values ('abcdef');
|
|
insert into test2 values ('quark');
|
|
insert into test2 values (' z foo bar');
|
|
create index test2_idx_gin on test2 using gin (t gin_trgm_ops);
|
|
set enable_seqscan=off;
|
|
explain (costs off)
|
|
select * from test2 where t like '%BCD%';
|
|
explain (costs off)
|
|
select * from test2 where t ilike '%BCD%';
|
|
select * from test2 where t like '%BCD%';
|
|
select * from test2 where t like '%bcd%';
|
|
select * from test2 where t like E'%\\bcd%';
|
|
select * from test2 where t ilike '%BCD%';
|
|
select * from test2 where t ilike 'qua%';
|
|
select * from test2 where t like '%z foo bar%';
|
|
select * from test2 where t like ' z foo%';
|
|
explain (costs off)
|
|
select * from test2 where t ~ '[abc]{3}';
|
|
explain (costs off)
|
|
select * from test2 where t ~* 'DEF';
|
|
select * from test2 where t ~ '[abc]{3}';
|
|
select * from test2 where t ~ 'a[bc]+d';
|
|
select * from test2 where t ~ '(abc)*$';
|
|
select * from test2 where t ~* 'DEF';
|
|
select * from test2 where t ~ 'dEf';
|
|
select * from test2 where t ~* '^q';
|
|
select * from test2 where t ~* '[abc]{3}[def]{3}';
|
|
select * from test2 where t ~* 'ab[a-z]{3}';
|
|
select * from test2 where t ~* '(^| )qua';
|
|
select * from test2 where t ~ 'q.*rk$';
|
|
select * from test2 where t ~ 'q';
|
|
select * from test2 where t ~ '[a-z]{3}';
|
|
select * from test2 where t ~* '(a{10}|b{10}|c{10}){10}';
|
|
select * from test2 where t ~ 'z foo bar';
|
|
select * from test2 where t ~ ' z foo bar';
|
|
select * from test2 where t ~ ' z foo bar';
|
|
select * from test2 where t ~ ' z foo';
|
|
drop index test2_idx_gin;
|
|
create index test2_idx_gist on test2 using gist (t gist_trgm_ops);
|
|
set enable_seqscan=off;
|
|
explain (costs off)
|
|
select * from test2 where t like '%BCD%';
|
|
explain (costs off)
|
|
select * from test2 where t ilike '%BCD%';
|
|
select * from test2 where t like '%BCD%';
|
|
select * from test2 where t like '%bcd%';
|
|
select * from test2 where t like E'%\\bcd%';
|
|
select * from test2 where t ilike '%BCD%';
|
|
select * from test2 where t ilike 'qua%';
|
|
select * from test2 where t like '%z foo bar%';
|
|
select * from test2 where t like ' z foo%';
|
|
explain (costs off)
|
|
select * from test2 where t ~ '[abc]{3}';
|
|
explain (costs off)
|
|
select * from test2 where t ~* 'DEF';
|
|
select * from test2 where t ~ '[abc]{3}';
|
|
select * from test2 where t ~ 'a[bc]+d';
|
|
select * from test2 where t ~ '(abc)*$';
|
|
select * from test2 where t ~* 'DEF';
|
|
select * from test2 where t ~ 'dEf';
|
|
select * from test2 where t ~* '^q';
|
|
select * from test2 where t ~* '[abc]{3}[def]{3}';
|
|
select * from test2 where t ~* 'ab[a-z]{3}';
|
|
select * from test2 where t ~* '(^| )qua';
|
|
select * from test2 where t ~ 'q.*rk$';
|
|
select * from test2 where t ~ 'q';
|
|
select * from test2 where t ~ '[a-z]{3}';
|
|
select * from test2 where t ~* '(a{10}|b{10}|c{10}){10}';
|
|
select * from test2 where t ~ 'z foo bar';
|
|
select * from test2 where t ~ ' z foo bar';
|
|
select * from test2 where t ~ ' z foo bar';
|
|
select * from test2 where t ~ ' z foo';
|
|
|
|
-- Check similarity threshold (bug #14202)
|
|
|
|
CREATE TEMP TABLE restaurants (city text);
|
|
INSERT INTO restaurants SELECT 'Warsaw' FROM generate_series(1, 10000);
|
|
INSERT INTO restaurants SELECT 'Szczecin' FROM generate_series(1, 10000);
|
|
CREATE INDEX ON restaurants USING gist(city gist_trgm_ops);
|
|
|
|
-- Similarity of the two names (for reference).
|
|
SELECT similarity('Szczecin', 'Warsaw');
|
|
|
|
-- Should get only 'Warsaw' for either setting of set_limit.
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT DISTINCT city, similarity(city, 'Warsaw'), show_limit()
|
|
FROM restaurants WHERE city % 'Warsaw';
|
|
SELECT set_limit(0.3);
|
|
SELECT DISTINCT city, similarity(city, 'Warsaw'), show_limit()
|
|
FROM restaurants WHERE city % 'Warsaw';
|
|
SELECT set_limit(0.5);
|
|
SELECT DISTINCT city, similarity(city, 'Warsaw'), show_limit()
|
|
FROM restaurants WHERE city % 'Warsaw';
|