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    <p>I don't believe you can do this OOTB in Lucene currently - searching for this functionality yields this open issue:</p> <p><a href="https://issues.apache.org/jira/browse/LUCENE-1421" rel="nofollow noreferrer">Jira Lucene Feature Request</a></p> <p>The functionality is present OOTB with Solr however - which provides a faceting feature. A query such as the following:</p> <p><a href="http://localhost:8983/solr/select?q=ipod&amp;rows=0&amp;facet=true&amp;facet.limit=-1&amp;facet.field=cat&amp;facet.field=inStock" rel="nofollow noreferrer">http://localhost:8983/solr/select?q=ipod&amp;rows=0&amp;facet=true&amp;facet.limit=-1&amp;facet.field=cat&amp;facet.field=inStock</a> </p> <p>would return the following result:</p> <pre><code>&lt;response&gt; &lt;responseHeader&gt;&lt;status&gt;0&lt;/status&gt;&lt;QTime&gt;2&lt;/QTime&gt;&lt;/responseHeader&gt; &lt;result numFound="4" start="0"/&gt; &lt;lst name="facet_counts"&gt; &lt;lst name="facet_queries"/&gt; &lt;lst name="facet_fields"&gt; &lt;lst name="cat"&gt; &lt;int name="search"&gt;0&lt;/int&gt; &lt;int name="memory"&gt;0&lt;/int&gt; &lt;int name="graphics"&gt;0&lt;/int&gt; &lt;int name="card"&gt;0&lt;/int&gt; &lt;int name="music"&gt;1&lt;/int&gt; &lt;int name="software"&gt;0&lt;/int&gt; &lt;int name="electronics"&gt;3&lt;/int&gt; &lt;int name="copier"&gt;0&lt;/int&gt; &lt;int name="multifunction"&gt;0&lt;/int&gt; &lt;int name="camera"&gt;0&lt;/int&gt; &lt;int name="connector"&gt;2&lt;/int&gt; &lt;int name="hard"&gt;0&lt;/int&gt; &lt;int name="scanner"&gt;0&lt;/int&gt; &lt;int name="monitor"&gt;0&lt;/int&gt; &lt;int name="drive"&gt;0&lt;/int&gt; &lt;int name="printer"&gt;0&lt;/int&gt; &lt;/lst&gt; &lt;lst name="inStock"&gt; &lt;int name="false"&gt;3&lt;/int&gt; &lt;int name="true"&gt;1&lt;/int&gt; &lt;/lst&gt; &lt;/lst&gt; &lt;/lst&gt; &lt;/response&gt; </code></pre> <p>More information on faceting can be found on the Solr website:</p> <p><a href="http://wiki.apache.org/solr/SimpleFacetParameters" rel="nofollow noreferrer">http://wiki.apache.org/solr/SimpleFacetParameters</a></p> <p><strong>EDIT:</strong> If you definitely don't want to go down the SOLR aproach to faceting you may be able to leverage the functionality in this patch described for Lucene:</p> <p><a href="http://sujitpal.blogspot.com/2007/01/faceted-searching-with-lucene.html" rel="nofollow noreferrer">http://sujitpal.blogspot.com/2007/01/faceted-searching-with-lucene.html</a></p> <p>which provides an implementation of the faceting feature on top of Lucene 2.0 via a patch. </p>
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    1. POGrouping Lucene search results and calculating frequency by category
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    1. COCan you please answer this one? http://stackoverflow.com/questions/899542/problem-using-same-instance-of-indexsearcher-for-multiple-requests
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      1. USSteve Chapman
 

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