Обсуждение: pgsql: Add levenshtein_less_equal, optimized version for small distance

Add levenshtein_less_equal, optimized version for small distances.

Alexander Korotkov, heavily revised by me.

Branch
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master

Details
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http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=604ab08145d0dde91279c430e08d570717c12b30

Modified Files
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contrib/fuzzystrmatch/fuzzystrmatch.c             |  246 ++-----------
contrib/fuzzystrmatch/fuzzystrmatch.sql.in        |    8 +
contrib/fuzzystrmatch/levenshtein.c               |  397 +++++++++++++++++++++
contrib/fuzzystrmatch/uninstall_fuzzystrmatch.sql |    4 +
doc/src/sgml/fuzzystrmatch.sgml                   |   19 +
5 files changed, 460 insertions(+), 214 deletions(-)