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<title>49.4.Examples</title>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="gist-examples"></a>49.4.Examples</h2></div></div></div>
<p> The <span class="productname">PostgreSQL</span> source distribution includes
several examples of index methods implemented using
<acronym class="acronym">GiST</acronym>. The core system currently provides R-Tree
equivalent functionality for some of the built-in geometric data types
(see <code class="filename">src/backend/access/gist/gistproc.c</code>). The following
<code class="filename">contrib</code> modules also contain <acronym class="acronym">GiST</acronym>
operator classes:
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<div class="variablelist"><dl>
<dt><span class="term">btree_gist</span></dt>
<dd><p>B-Tree equivalent functionality for several data types</p></dd>
<dt><span class="term">cube</span></dt>
<dd><p>Indexing for multi-dimensional cubes</p></dd>
<dt><span class="term">intarray</span></dt>
<dd><p>RD-Tree for one-dimensional array of int4 values</p></dd>
<dt><span class="term">ltree</span></dt>
<dd><p>Indexing for tree-like structures</p></dd>
<dt><span class="term">pg_trgm</span></dt>
<dd><p>Text similarity using trigram matching</p></dd>
<dt><span class="term">seg</span></dt>
<dd><p>Indexing for “<span class="quote">float ranges</span>”</p></dd>
<dt><span class="term">tsearch2</span></dt>
<dd><p>Full text indexing</p></dd>
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