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Fix contrib/pg_trgm's similarity() function for trigram-free strings.

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Cases such as similarity('', '') produced a NaN result due to computing
0/0.  Per discussion, make it return zero instead.

This appears to be the basic cause of bug #7867 from Michele Baravalle,
although it remains unclear why her installation doesn't think Cyrillic
letters are letters.

Back-patch to all active branches.
This commit is contained in:
Tom Lane
2013-02-13 14:07:17 -05:00
parent 52c889ea4f
commit f73a16340c
3 changed files with 14 additions and 2 deletions
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2
contrib/pg_trgm/sql/pg_trgm.sql
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@@ -11,6 +11,8 @@ select show_trgm('a b C0*%^');
select similarity('wow','WOWa ');
select similarity('wow',' WOW ');
select similarity('---', '####---');
CREATE TABLE test_trgm(t text);
\copy test_trgm from 'data/trgm.data