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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>F.13. dict_int</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="contrib-dblink-build-sql-update.html" title="dblink_build_sql_update" /><link rel="next" href="dict-xsyn.html" title="F.14. dict_xsyn" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">F.13. dict_int</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="contrib-dblink-build-sql-update.html" title="dblink_build_sql_update">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="contrib.html" title="Appendix F. Additional Supplied Modules">Up</a></td><th width="60%" align="center">Appendix F. Additional Supplied Modules</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="dict-xsyn.html" title="F.14. dict_xsyn">Next</a></td></tr></table><hr /></div><div class="sect1" id="DICT-INT"><div class="titlepage"><div><div><h2 class="title" style="clear: both">F.13. dict_int</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="dict-int.html#id-1.11.7.22.5">F.13.1. Configuration</a></span></dt><dt><span class="sect2"><a href="dict-int.html#id-1.11.7.22.6">F.13.2. Usage</a></span></dt></dl></div><a id="id-1.11.7.22.2" class="indexterm"></a><p>
+  <code class="filename">dict_int</code> is an example of an add-on dictionary template
+  for full-text search.  The motivation for this example dictionary is to
+  control the indexing of integers (signed and unsigned), allowing such
+  numbers to be indexed while preventing excessive growth in the number of
+  unique words, which greatly affects the performance of searching.
+ </p><p>
+  This module is considered <span class="quote">“<span class="quote">trusted</span>”</span>, that is, it can be
+  installed by non-superusers who have <code class="literal">CREATE</code> privilege
+  on the current database.
+ </p><div class="sect2" id="id-1.11.7.22.5"><div class="titlepage"><div><div><h3 class="title">F.13.1. Configuration</h3></div></div></div><p>
+   The dictionary accepts three options:
+  </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>
+     The <code class="literal">maxlen</code> parameter specifies the maximum number of
+     digits allowed in an integer word.  The default value is 6.
+    </p></li><li class="listitem"><p>
+     The <code class="literal">rejectlong</code> parameter specifies whether an overlength
+     integer should be truncated or ignored.  If <code class="literal">rejectlong</code> is
+     <code class="literal">false</code> (the default), the dictionary returns the first
+     <code class="literal">maxlen</code> digits of the integer. If <code class="literal">rejectlong</code> is
+     <code class="literal">true</code>, the dictionary treats an overlength integer as a stop
+     word, so that it will not be indexed.  Note that this also means that
+     such an integer cannot be searched for.
+    </p></li><li class="listitem"><p>
+     The <code class="literal">absval</code> parameter specifies whether leading
+     <span class="quote">“<span class="quote"><code class="literal">+</code></span>”</span> or <span class="quote">“<span class="quote"><code class="literal">-</code></span>”</span>
+     signs should be removed from integer words.  The default
+     is <code class="literal">false</code>.  When <code class="literal">true</code>, the sign is
+     removed before <code class="literal">maxlen</code> is applied.
+    </p></li></ul></div></div><div class="sect2" id="id-1.11.7.22.6"><div class="titlepage"><div><div><h3 class="title">F.13.2. Usage</h3></div></div></div><p>
+   Installing the <code class="literal">dict_int</code> extension creates a text search
+   template <code class="literal">intdict_template</code> and a dictionary <code class="literal">intdict</code>
+   based on it, with the default parameters.  You can alter the
+   parameters, for example
+
+</p><pre class="programlisting">
+mydb# ALTER TEXT SEARCH DICTIONARY intdict (MAXLEN = 4, REJECTLONG = true);
+ALTER TEXT SEARCH DICTIONARY
+</pre><p>
+
+   or create new dictionaries based on the template.
+  </p><p>
+   To test the dictionary, you can try
+
+</p><pre class="programlisting">
+mydb# select ts_lexize('intdict', '12345678');
+ ts_lexize
+-----------
+ {123456}
+</pre><p>
+
+   but real-world usage will involve including it in a text search
+   configuration as described in <a class="xref" href="textsearch.html" title="Chapter 12. Full Text Search">Chapter 12</a>.
+   That might look like this:
+
+</p><pre class="programlisting">
+ALTER TEXT SEARCH CONFIGURATION english
+    ALTER MAPPING FOR int, uint WITH intdict;
+</pre><p>
+
+  </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="contrib-dblink-build-sql-update.html" title="dblink_build_sql_update">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="contrib.html" title="Appendix F. Additional Supplied Modules">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="dict-xsyn.html" title="F.14. dict_xsyn">Next</a></td></tr><tr><td width="40%" align="left" valign="top">dblink_build_sql_update </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> F.14. dict_xsyn</td></tr></table></div></body></html>
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