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eaf99e4c4a
fuzzystrmatch's difference() function assumes that _soundex() always initializes its output buffer fully. This was not so for the case of a string containing no alphabetic characters, resulting in unstable output and Valgrind complaints. Fix by using memset() to fill the whole buffer in the early-exit case. Also make some cosmetic improvements (I didn't care for the random switches between "instr[0]" and "*instr" notation). Report and diagnosis by Alexander Lakhin (bug #17935). Back-patch to all supported branches. Discussion: https://postgr.es/m/17935-b99316aa79c18513@postgresql.org
74 lines
1.4 KiB
Plaintext
74 lines
1.4 KiB
Plaintext
CREATE EXTENSION fuzzystrmatch;
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SELECT soundex('hello world!');
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soundex
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---------
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H464
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(1 row)
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SELECT soundex('Anne'), soundex('Ann'), difference('Anne', 'Ann');
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soundex | soundex | difference
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---------+---------+------------
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A500 | A500 | 4
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(1 row)
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SELECT soundex('Anne'), soundex('Andrew'), difference('Anne', 'Andrew');
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soundex | soundex | difference
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---------+---------+------------
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A500 | A536 | 2
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(1 row)
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SELECT soundex('Anne'), soundex('Margaret'), difference('Anne', 'Margaret');
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soundex | soundex | difference
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---------+---------+------------
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A500 | M626 | 0
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(1 row)
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SELECT soundex(''), difference('', '');
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soundex | difference
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---------+------------
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| 4
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(1 row)
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SELECT levenshtein('GUMBO', 'GAMBOL');
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levenshtein
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-------------
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2
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(1 row)
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SELECT levenshtein('GUMBO', 'GAMBOL', 2, 1, 1);
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levenshtein
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-------------
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3
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(1 row)
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SELECT levenshtein_less_equal('extensive', 'exhaustive', 2);
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levenshtein_less_equal
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------------------------
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3
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(1 row)
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SELECT levenshtein_less_equal('extensive', 'exhaustive', 4);
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levenshtein_less_equal
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------------------------
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4
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(1 row)
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SELECT metaphone('GUMBO', 4);
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metaphone
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-----------
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KM
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(1 row)
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SELECT dmetaphone('gumbo');
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dmetaphone
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------------
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KMP
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(1 row)
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SELECT dmetaphone_alt('gumbo');
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dmetaphone_alt
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----------------
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KMP
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(1 row)
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