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Posted to dev@lucene.apache.org by "Otis Gospodnetic (JIRA)" <ji...@apache.org> on 2006/07/09 16:48:30 UTC
[jira] Assigned: (LUCENE-509) Performance optimization when
retrieving a single field from a document
[ http://issues.apache.org/jira/browse/LUCENE-509?page=all ]
Otis Gospodnetic reassigned LUCENE-509:
---------------------------------------
Assign To: Otis Gospodnetic
> Performance optimization when retrieving a single field from a document
> -----------------------------------------------------------------------
>
> Key: LUCENE-509
> URL: http://issues.apache.org/jira/browse/LUCENE-509
> Project: Lucene - Java
> Type: Improvement
> Components: Index
> Versions: 1.9, 2.0.0
> Reporter: Steven Tamm
> Assignee: Otis Gospodnetic
> Attachments: DocField.patch, DocField_2.patch, DocField_3.patch, DocField_4.patch, DocField_4b.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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