1d369c9e90
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
68 lines
1.9 KiB
SQL
68 lines
1.9 KiB
SQL
CREATE EXTENSION fuzzystrmatch;
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SELECT soundex('hello world!');
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SELECT soundex('Anne'), soundex('Ann'), difference('Anne', 'Ann');
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SELECT soundex('Anne'), soundex('Andrew'), difference('Anne', 'Andrew');
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SELECT soundex('Anne'), soundex('Margaret'), difference('Anne', 'Margaret');
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SELECT soundex(''), difference('', '');
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SELECT levenshtein('GUMBO', 'GAMBOL');
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SELECT levenshtein('GUMBO', 'GAMBOL', 2, 1, 1);
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SELECT levenshtein_less_equal('extensive', 'exhaustive', 2);
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SELECT levenshtein_less_equal('extensive', 'exhaustive', 4);
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SELECT metaphone('GUMBO', 4);
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SELECT dmetaphone('gumbo');
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SELECT dmetaphone_alt('gumbo');
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-- Wovels
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SELECT daitch_mokotoff('Augsburg');
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SELECT daitch_mokotoff('Breuer');
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SELECT daitch_mokotoff('Freud');
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-- The letter "H"
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SELECT daitch_mokotoff('Halberstadt');
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SELECT daitch_mokotoff('Mannheim');
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-- Adjacent sounds
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SELECT daitch_mokotoff('Chernowitz');
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-- Adjacent letters with identical adjacent code digits
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SELECT daitch_mokotoff('Cherkassy');
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SELECT daitch_mokotoff('Kleinman');
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-- More than one word
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SELECT daitch_mokotoff('Nowy Targ');
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-- Padded with "0"
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SELECT daitch_mokotoff('Berlin');
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-- Other examples from https://www.avotaynu.com/soundex.htm
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SELECT daitch_mokotoff('Ceniow');
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SELECT daitch_mokotoff('Tsenyuv');
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SELECT daitch_mokotoff('Holubica');
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SELECT daitch_mokotoff('Golubitsa');
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SELECT daitch_mokotoff('Przemysl');
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SELECT daitch_mokotoff('Pshemeshil');
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SELECT daitch_mokotoff('Rosochowaciec');
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SELECT daitch_mokotoff('Rosokhovatsets');
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-- Ignored characters
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SELECT daitch_mokotoff('''OBrien');
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SELECT daitch_mokotoff('O''Brien');
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-- "Difficult" cases, likely to cause trouble for other implementations.
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SELECT daitch_mokotoff('CJC');
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SELECT daitch_mokotoff('BESST');
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SELECT daitch_mokotoff('BOUEY');
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SELECT daitch_mokotoff('HANNMANN');
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SELECT daitch_mokotoff('MCCOYJR');
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SELECT daitch_mokotoff('ACCURSO');
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SELECT daitch_mokotoff('BIERSCHBACH');
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