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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-509) Performance optimization when retrieving a single field from a document
Date Mon, 12 Jun 2006 01:21:30 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-509?page=comments#action_12415798 ] 

Grant Ingersoll commented on LUCENE-509:
----------------------------------------

Hi Steve,

Does Issue 545 take care of this one?  I just committed it on Friday and I think it does.
 Or perhaps there are parts of this that would fit in with 545?

Thanks,
Grant

> 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
>  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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