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POWhat is the correct Solr fieldType to use for sorting integer values?
 

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  1. POWhat is the correct Solr fieldType to use for sorting integer values?
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    <p>I am using Solr 3.6.1. What is the correct field type to use for a Solr sort field containing integer values? I need this field only for sorting and will never do range queries on it. Should I use <code>integer</code> or <code>sint</code>?</p> <p>I see that in schema.xml, there is <code>sint</code> type declared as: </p> <pre><code> &lt;!-- Numeric field types that manipulate the value into a string value that isn't human-readable in its internal form, but with a lexicographic ordering the same as the numeric ordering, so that range queries work correctly. --&gt; &lt;fieldType name="sint" class="solr.SortableIntField" sortMissingLast="true" omitNorms="true"/&gt; </code></pre> <p>whereas <code>integer</code> says the following:</p> <pre><code> &lt;!-- numeric field types that store and index the text value verbatim (and hence don't support range queries, since the lexicographic ordering isn't equal to the numeric ordering) --&gt; &lt;fieldType name="integer" class="solr.IntField" omitNorms="true"/&gt; </code></pre> <p>The main reason I am asking this is because every Solr sort I do on an <code>sint</code> field (I have lots of them declared as dynamic fields) populates the (unconfigurable) lucene fieldCache. I see on the stats page (http://HOST:PORT/solr/CORE/admin/stats.jsp) under fieldCache that <code>sint</code> sorts are stored as </p> <p><code>org.apache.lucene.search.FieldCache$StringIndex</code></p> <p>whereas <code>integer</code> sorts are stored as </p> <p><code>org.apache.lucene.search.FieldCache.DEFAULT_INT_PARSER</code></p> <p>which I believe consumes less space?</p> <hr> <p>UPDATE: Solr 3.6.1 schema.xml has <code>int</code> declared as <code>TrieIntField</code> i.e. as</p> <p><code>&lt;fieldType name="int" class="solr.TrieIntField" precisionStep="0" positionIncrementGap="0"/&gt;</code></p> <p>The one above was from an older solr version.</p>
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    1. COYou should always use TrieIntField instead of IntField and SortableIntField: this class has a **much** more memory-efficient FieldCache impl
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