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From "Steven Tamm (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-509) Performance optimization when retrieving a single field from a document
Date Sat, 14 Oct 2006 02:48:51 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-509?page=comments#action_12442154 ] 
            
Steven Tamm commented on LUCENE-509:
------------------------------------


   [[ Old comment, sent by email on Fri, 23 Jun 2006 09:16:17 -0700 ]]

It does.  There isn't a real performance difference between
LOAD_AND_BREAK and my getField thing, except it'll create two extra
objects (Vector & Document).  Probably not that big a deal since the
bigger issue was the IO in reading the rest of the document.

Close mine out.

-Steven



> 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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