From: Bruce Momjian <bruce@momjian.us>
Date: Mon, 24 Mar 2014 19:46:59 +0000 (-0400)
Subject: docs:  Add short "cover density" description
X-Git-Tag: REL9_4_BETA1~284
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=0b5c0f3bc78d72b753387f84b9188709af3ef8fb;p=thirdparty%2Fpostgresql.git

docs:  Add short "cover density" description

Also, previous commit 1420f3a9827a39e5c6c998f6fa35a6fc97903145 to fix
ts_rank_cd() for stripped lexemes was from a patch created by Alex Hill.
---

diff --git a/doc/src/sgml/textsearch.sgml b/doc/src/sgml/textsearch.sgml
index 9e78286bb59..fd54c4425dc 100644
--- a/doc/src/sgml/textsearch.sgml
+++ b/doc/src/sgml/textsearch.sgml
@@ -885,7 +885,9 @@ SELECT plainto_tsquery('english', 'The Fat &amp; 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>