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docs: Add short "cover density" description

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Also, previous commit 1420f3a982 to fix
ts_rank_cd() for stripped lexemes was from a patch created by Alex Hill.
This commit is contained in:
Bruce Momjian 2014-03-24 15:46:59 -04:00
parent 1420f3a982
commit 0b5c0f3bc7
1 changed files with 3 additions and 1 deletions
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doc/src/sgml/textsearch.sgml
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@ -885,7 +885,9 @@ SELECT plainto_tsquery('english', 'The Fat & Rats:C');
ranking for the given document vector and query, as described in
Clarke, Cormack, and Tudhope's "Relevance Ranking for One to Three
Term Queries" in the journal "Information Processing and Management",
1999.
1999. Cover density is similar to <function>ts_rank</> ranking
except that the proximity of matching lexemes to each other is
taken into consideration.
</para>
<para>