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POSolr: exact phrase query with a EdgeNGramFilterFactory
 

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  1. POSolr: exact phrase query with a EdgeNGramFilterFactory
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    <p>In Solr (3.3), is it possible to make a field letter-by-letter searchable through a <code>EdgeNGramFilterFactory</code> and also sensitive to phrase queries?</p> <p>By example, I'm looking for a field that, if containing "contrat informatique", will be found if the user types:</p> <ul> <li>contrat</li> <li>informatique</li> <li>contr</li> <li>informa</li> <li>"contrat informatique"</li> <li>"contrat info"</li> </ul> <p>Currently, I made something like this:</p> <pre><code>&lt;fieldtype name="terms" class="solr.TextField"&gt; &lt;analyzer type="index"&gt; &lt;charFilter class="solr.MappingCharFilterFactory" mapping="mapping-ISOLatin1Accent.txt"/&gt; &lt;filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="1" catenateNumbers="1" catenateAll="0" splitOnCaseChange="1"/&gt; &lt;tokenizer class="solr.LowerCaseTokenizerFactory"/&gt; &lt;filter class="solr.EdgeNGramFilterFactory" minGramSize="2" maxGramSize="15" side="front"/&gt; &lt;/analyzer&gt; &lt;analyzer type="query"&gt; &lt;charFilter class="solr.MappingCharFilterFactory" mapping="mapping-ISOLatin1Accent.txt"/&gt; &lt;filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="1" catenateNumbers="1" catenateAll="0" splitOnCaseChange="1"/&gt; &lt;tokenizer class="solr.LowerCaseTokenizerFactory"/&gt; &lt;/analyzer&gt; &lt;/fieldtype&gt; </code></pre> <p>...but it failed on phrase queries.</p> <p>When I look in the schema analyzer in solr admin, I find that "contrat informatique" generated the followings tokens:</p> <pre><code>[...] contr contra contrat in inf info infor inform [...] </code></pre> <p>So the query works with "contrat in" (consecutive tokens), but not "contrat inf" (because this two tokens are separated).</p> <p>I'm pretty sure any kind of stemming can work with phrase queries, but I cannot find the right tokenizer of filter to use before the <code>EdgeNGramFilterFactory</code>.</p>
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