daitch_mokotoff module

Dag Lem <dag@nimrod.no>

From: Dag Lem <dag@nimrod.no>

To: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>

Date: 2021-12-03T20:07:29Z

Lists: pgsql-hackers

Commits

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Avoid using non-ASCII commentary in daitch_mokotoff.c.
- 1c54b93a8cf9 16.0 landed
Remove some non-ASCII symbols from a comment.
- d6b5dee42de7 16.0 landed
Remove useless dependencies in daitch_mokotoff_header.pl.
- 2bfbad9c4220 16.0 landed
Pacify perlcritic.
- edc627ae2763 16.0 landed
Add support for Daitch-Mokotoff Soundex in contrib/fuzzystrmatch.
- a290378a3752 16.0 landed
Enable routine running of citext's UTF8-specific test cases.
- c2e8bd27519f 15.0 landed

Attachments

daitch_mokotoff.patch (text/x-patch) patch
soundex-comparison.sh (application/x-sh)

Hello,

Please find attached a patch for the daitch_mokotoff module.

This implements the Daitch-Mokotoff Soundex System, as described in
https://www.avotaynu.com/soundex.htm

The module is used in production at Finance Norway.

In order to verify correctness, I have compared generated soundex codes
with corresponding results from the implementation by Stephen P. Morse
at https://stevemorse.org/census/soundex.html

Where soundex codes differ, the daitch_mokotoff module has been found
to be correct. The Morse implementation uses a few unofficial rules,
and also has an error in the handling of adjacent identical code
digits. Please see daitch_mokotoff.c for further references and
comments.

For reference, detailed instructions for soundex code comparison are
attached.


Best regards

Dag Lem