From: | teodor(at)postgresql(dot)org (Teodor Sigaev) |
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To: | pgsql-committers(at)postgresql(dot)org |
Subject: | pgsql: Significantly improve ranking: 1) rank_cd now use weight of |
Date: | 2006-03-02 19:07:20 |
Message-ID: | 20060302190720.7FEAA9DCD85@postgresql.org |
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Lists: | pgsql-committers |
Log Message:
-----------
Significantly improve ranking:
1) rank_cd now use weight of lexemes
2) rank_cd and rank can use any combination of normalization methods:
no normalization
normalization by log(length of document)
-----/------- by length of document
-----/------- by number of unique word in document
-----/------- by log(number of unique word in document)
-----/------- by number of covers (only rank_cd)
Improve cover's search.
TODO: changes in documentation
Modified Files:
--------------
pgsql/contrib/tsearch2:
rank.c (r1.15 -> r1.16)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/rank.c.diff?r1=1.15&r2=1.16)
tsearch.sql.in (r1.16 -> r1.17)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/tsearch.sql.in.diff?r1=1.16&r2=1.17)
pgsql/contrib/tsearch2/expected:
tsearch2.out (r1.18 -> r1.19)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/expected/tsearch2.out.diff?r1=1.18&r2=1.19)
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