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From "Otis Gospodnetic (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (LUCENE-509) Performance optimization when retrieving a single field from a document
Date Sun, 13 Aug 2006 06:17:16 GMT
     [ 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It looks like this was superseded by LUCENE-545, whose patches have been applied to the trunk.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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