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From "Steven Tamm (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-509) Performance optimization when retrieving a single field from a document
Date Thu, 02 Mar 2006 17:24:42 GMT
Performance optimization when retrieving a single field from a document
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         Key: LUCENE-509
         URL: http://issues.apache.org/jira/browse/LUCENE-509
     Project: Lucene - Java
        Type: Improvement
  Components: Index  
    Versions: 1.9, 2.0    
    Reporter: Steven Tamm
 Attachments: DocField.patch

If you just want to retrieve a single field from a Document, the only way to do it is to retrieve
all the fields from the Document and then search it.  This patch is an optimization that allows
you retrieve a specific field from a document without instantiating a lot of field and string
objects.  This reduces our memory consumption on a per query basis by around around 20% when
a lot of documents are returned.

I've added a lot of comments saying you should only call it if you only ever need one field.
 There's also a unit test.

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