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From "Otis Gospodnetic (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (LUCENE-509) Performance optimization when retrieving a single field from a document
Date Sun, 09 Jul 2006 14:48:30 GMT
     [ 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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