[ http://issues.apache.org/jira/browse/LUCENE-509?page=all ]
Steven Tamm updated LUCENE-509:
-------------------------------
Attachment: DocField_3.patch
This includes a UTF-8 test. It fails with the first patch and works with the
second.
I specifically chose to return only the first Field because otherwise you need
to read all the fields in the document. Now, if the field appears near the
beginning of the list of fields, it requires less IO to retrieve
> 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
> Reporter: Steven Tamm
> Attachments: DocField.patch, DocField_2.patch, DocField_3.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.
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see:
http://www.atlassian.com/software/jira
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
