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Handle equality operator in contrib/pg_trgm

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Obviously, in order to equality operator be satisfiable, target string must
contain all the trigrams of the search string.  On this base, we implement
equality operator in GiST/GIN indexes with recheck.

Discussion: https://postgr.es/m/CAOBaU_YWwtT7tdggtROacjdOdeYHCz-tmSwuC-j-TOG-g97J0w%40mail.gmail.com
Author: Julien Rouhaud
Reviewed-by: Tom Lane, Alexander Korotkov, Georgios Kokolatos, Erik Rijkers
This commit is contained in:
Alexander Korotkov
2020-11-15 08:52:12 +03:00
parent 92bf7e2d02
commit 935f666650
9 changed files with 264 additions and 10 deletions
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40
contrib/pg_trgm/sql/pg_trgm.sql
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@@ -101,6 +101,12 @@ insert into test2 values ('abcdef');
insert into test2 values ('quark');
insert into test2 values (' z foo bar');
insert into test2 values ('/123/-45/');
insert into test2 values ('line 1');
insert into test2 values ('%line 2');
insert into test2 values ('line 3%');
insert into test2 values ('%line 4%');
insert into test2 values ('%li%ne 5%');
insert into test2 values ('li_e 6');
create index test2_idx_gin on test2 using gin (t gin_trgm_ops);
set enable_seqscan=off;
explain (costs off)
@@ -137,6 +143,23 @@ select * from test2 where t ~ ' z foo bar';
select * from test2 where t ~ ' z foo';
select * from test2 where t ~ 'qua(?!foo)';
select * from test2 where t ~ '/\d+/-\d';
-- test = operator
explain (costs off)
select * from test2 where t = 'abcdef';
select * from test2 where t = 'abcdef';
explain (costs off)
select * from test2 where t = '%line%';
select * from test2 where t = '%line%';
select * from test2 where t = 'li_e 1';
select * from test2 where t = '%line 2';
select * from test2 where t = 'line 3%';
select * from test2 where t = '%line 3%';
select * from test2 where t = '%line 4%';
select * from test2 where t = '%line 5%';
select * from test2 where t = '%li_ne 5%';
select * from test2 where t = '%li%ne 5%';
select * from test2 where t = 'line 6';
select * from test2 where t = 'li_e 6';
drop index test2_idx_gin;
create index test2_idx_gist on test2 using gist (t gist_trgm_ops);
@@ -175,6 +198,23 @@ select * from test2 where t ~ ' z foo bar';
select * from test2 where t ~ ' z foo';
select * from test2 where t ~ 'qua(?!foo)';
select * from test2 where t ~ '/\d+/-\d';
-- test = operator
explain (costs off)
select * from test2 where t = 'abcdef';
select * from test2 where t = 'abcdef';
explain (costs off)
select * from test2 where t = '%line%';
select * from test2 where t = '%line%';
select * from test2 where t = 'li_e 1';
select * from test2 where t = '%line 2';
select * from test2 where t = 'line 3%';
select * from test2 where t = '%line 3%';
select * from test2 where t = '%line 4%';
select * from test2 where t = '%line 5%';
select * from test2 where t = '%li_ne 5%';
select * from test2 where t = '%li%ne 5%';
select * from test2 where t = 'line 6';
select * from test2 where t = 'li_e 6';
-- Check similarity threshold (bug #14202)