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Remove claim that ts_headline knows how to generate multiple ellipsis-separated 

excerpts of a document.  That's clearly desirable, but the functionality
is not there yet.
This commit is contained in:
Tom Lane 2007-10-29 01:55:11 +00:00
parent 3fe266207b
commit f9e83a5588
1 changed files with 21 additions and 18 deletions
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39
doc/src/sgml/textsearch.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/textsearch.sgml,v 1.28 2007/10/27 16:01:08 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/textsearch.sgml,v 1.29 2007/10/29 01:55:11 tgl Exp $ -->
<chapter id="textsearch">
<title id="textsearch-title">Full Text Search</title>
@ -1040,7 +1040,7 @@ ORDER BY rank DESC LIMIT 10;
<para>
<function>ts_headline</function> accepts a document along
with a query, and returns one or more ellipsis-separated excerpts from
with a query, and returns an excerpt from
the document in which terms from the query are highlighted. The
configuration to be used to parse the document can be specified by
<replaceable>config</replaceable>; if <replaceable>config</replaceable>
@ -1094,24 +1094,27 @@ StartSel=&lt;b&gt;, StopSel=&lt;/b&gt;, MaxWords=35, MinWords=15, ShortWord=3, H
For example:
<programlisting>
SELECT ts_headline('ts_headline accepts a document along
with a query, and returns one or more ellipsis-separated excerpts from
the document in which terms from the query are highlighted.',
to_tsquery('ellipsis &amp; term'));
ts_headline
--------------------------------------------------------------------
&lt;b&gt;ellipsis&lt;/b&gt;-separated excerpts from
the document in which &lt;b&gt;terms&lt;/b&gt; from the query are highlighted.
SELECT ts_headline('The most common type of search
is to find all documents containing given query terms
and return them in order of their similarity to the
query.', to_tsquery('query &amp; similarity'));
ts_headline
------------------------------------------------------------
given &lt;b&gt;query&lt;/b&gt; terms
and return them in order of their &lt;b&gt;similarity&lt;/b&gt; to the
&lt;b&gt;query&lt;/b&gt;.
SELECT ts_headline('ts_headline accepts a document along
with a query, and returns one or more ellipsis-separated excerpts from
the document in which terms from the query are highlighted.',
to_tsquery('ellipsis &amp; term'),
SELECT ts_headline('The most common type of search
is to find all documents containing given query terms
and return them in order of their similarity to the
query.',
to_tsquery('query &amp; similarity'),
'StartSel = &lt;, StopSel = &gt;');
ts_headline
---------------------------------------------------------------
&lt;ellipsis&gt;-separated excerpts from
the document in which &lt;terms&gt; from the query are highlighted.
ts_headline
-------------------------------------------------------
given &lt;query&gt; terms
and return them in order of their &lt;similarity&gt; to the
&lt;query&gt;.
</programlisting>
</para>