[ http://issues.apache.org/jira/browse/LUCENE-509?page=all ]
Otis Gospodnetic resolved LUCENE-509.
-------------------------------------
Resolution: Won't Fix
It looks like this was superseded by LUCENE-545, whose patches have been applied to the trunk.
> 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
> Issue Type: Improvement
> Components: Index
> Affects Versions: 1.9, 2.0.0
> Reporter: Steven Tamm
> Assigned To: 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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