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Fix bugs in contrib/pg_trgm's LIKE pattern analysis code.

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Extraction of trigrams did not process LIKE escape sequences properly,
leading to possible misidentification of trigrams near escapes, resulting
in incorrect index search results.

Fujii Masao
This commit is contained in:
Tom Lane
2012-08-20 13:24:52 -04:00
parent 51fed14d73
commit b2a01b9ad1
3 changed files with 39 additions and 19 deletions
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2
contrib/pg_trgm/sql/pg_trgm.sql
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@ -49,6 +49,7 @@ 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%';
drop index test2_idx_gin;
@ -60,5 +61,6 @@ 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%';