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911e702077
PostgreSQL provides set of template index access methods, where opclasses have much freedom in the semantics of indexing. These index AMs are GiST, GIN, SP-GiST and BRIN. There opclasses define representation of keys, operations on them and supported search strategies. So, it's natural that opclasses may be faced some tradeoffs, which require user-side decision. This commit implements opclass parameters allowing users to set some values, which tell opclass how to index the particular dataset. This commit doesn't introduce new storage in system catalog. Instead it uses pg_attribute.attoptions, which is used for table column storage options but unused for index attributes. In order to evade changing signature of each opclass support function, we implement unified way to pass options to opclass support functions. Options are set to fn_expr as the constant bytea expression. It's possible due to the fact that opclass support functions are executed outside of expressions, so fn_expr is unused for them. This commit comes with some examples of opclass options usage. We parametrize signature length in GiST. That applies to multiple opclasses: tsvector_ops, gist__intbig_ops, gist_ltree_ops, gist__ltree_ops, gist_trgm_ops and gist_hstore_ops. Also we parametrize maximum number of integer ranges for gist__int_ops. However, the main future usage of this feature is expected to be json, where users would be able to specify which way to index particular json parts. Catversion is bumped. Discussion: https://postgr.es/m/d22c3a18-31c7-1879-fc11-4c1ce2f5e5af%40postgrespro.ru Author: Nikita Glukhov, revised by me Reviwed-by: Nikolay Shaplov, Robert Haas, Tom Lane, Tomas Vondra, Alvaro Herrera
199 lines
8.5 KiB
SQL
199 lines
8.5 KiB
SQL
CREATE EXTENSION pg_trgm;
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-- Check whether any of our opclasses fail amvalidate
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SELECT amname, opcname
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FROM pg_opclass opc LEFT JOIN pg_am am ON am.oid = opcmethod
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WHERE opc.oid >= 16384 AND NOT amvalidate(opc.oid);
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--backslash is used in tests below, installcheck will fail if
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--standard_conforming_string is off
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set standard_conforming_strings=on;
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-- reduce noise
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set extra_float_digits = 0;
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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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select count(*) from test_trgm where t ~ '[qwerty]{2}-?[qwerty]{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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select count(*) from test_trgm where t ~ '[qwerty]{2}-?[qwerty]{2}';
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drop index trgm_idx;
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create index trgm_idx on test_trgm using gist (t gist_trgm_ops(siglen=0));
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create index trgm_idx on test_trgm using gist (t gist_trgm_ops(siglen=2025));
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create index trgm_idx on test_trgm using gist (t gist_trgm_ops(siglen=2024));
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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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select count(*) from test_trgm where t ~ '[qwerty]{2}-?[qwerty]{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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select count(*) from test_trgm where t ~ '[qwerty]{2}-?[qwerty]{2}';
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-- check handling of indexquals that generate no searchable conditions
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explain (costs off)
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select count(*) from test_trgm where t like '%99%' and t like '%qwerty%';
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select count(*) from test_trgm where t like '%99%' and t like '%qwerty%';
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explain (costs off)
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select count(*) from test_trgm where t like '%99%' and t like '%qw%';
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select count(*) from test_trgm where t like '%99%' and t like '%qw%';
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-- ensure that pending-list items are handled correctly, too
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create temp table t_test_trgm(t text COLLATE "C");
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create index t_trgm_idx on t_test_trgm using gin (t gin_trgm_ops);
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insert into t_test_trgm values ('qwerty99'), ('qwerty01');
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explain (costs off)
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select count(*) from t_test_trgm where t like '%99%' and t like '%qwerty%';
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select count(*) from t_test_trgm where t like '%99%' and t like '%qwerty%';
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explain (costs off)
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select count(*) from t_test_trgm where t like '%99%' and t like '%qw%';
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select count(*) from t_test_trgm where t like '%99%' and t like '%qw%';
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-- run the same queries with sequential scan to check the results
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set enable_bitmapscan=off;
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set enable_seqscan=on;
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select count(*) from test_trgm where t like '%99%' and t like '%qwerty%';
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select count(*) from test_trgm where t like '%99%' and t like '%qw%';
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select count(*) from t_test_trgm where t like '%99%' and t like '%qwerty%';
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select count(*) from t_test_trgm where t like '%99%' and t like '%qw%';
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reset enable_bitmapscan;
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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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insert into test2 values ('/123/-45/');
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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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select * from test2 where t ~ 'qua(?!foo)';
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select * from test2 where t ~ '/\d+/-\d';
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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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select * from test2 where t ~ 'qua(?!foo)';
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select * from test2 where t ~ '/\d+/-\d';
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-- Check similarity threshold (bug #14202)
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CREATE TEMP TABLE restaurants (city text);
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INSERT INTO restaurants SELECT 'Warsaw' FROM generate_series(1, 10000);
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INSERT INTO restaurants SELECT 'Szczecin' FROM generate_series(1, 10000);
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CREATE INDEX ON restaurants USING gist(city gist_trgm_ops);
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-- Similarity of the two names (for reference).
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SELECT similarity('Szczecin', 'Warsaw');
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-- Should get only 'Warsaw' for either setting of set_limit.
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EXPLAIN (COSTS OFF)
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SELECT DISTINCT city, similarity(city, 'Warsaw'), show_limit()
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FROM restaurants WHERE city % 'Warsaw';
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SELECT set_limit(0.3);
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SELECT DISTINCT city, similarity(city, 'Warsaw'), show_limit()
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FROM restaurants WHERE city % 'Warsaw';
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SELECT set_limit(0.5);
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SELECT DISTINCT city, similarity(city, 'Warsaw'), show_limit()
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FROM restaurants WHERE city % 'Warsaw';
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