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Add KNNGIST support to contrib/pg_trgm.

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Teodor Sigaev, with some revision by Tom
This commit is contained in:
Tom Lane
2010-12-04 00:16:21 -05:00
parent b576757d7e
commit b525bf771e
9 changed files with 214 additions and 43 deletions
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4
contrib/pg_trgm/sql/pg_trgm.sql
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@ -26,6 +26,7 @@ CREATE TABLE test_trgm(t text);
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;
@ -33,6 +34,9 @@ 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);