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Date: Thu, 3 Jun 2010 16:54:00 -0400 (EDT)
From: "Yonik Seeley (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-2380) Add FieldCache.getTermBytes, to
 load term data as byte[]
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    [ https://issues.apache.org/jira/browse/LUCENE-2380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12875287#action_12875287 ] 

Yonik Seeley commented on LUCENE-2380:
--------------------------------------

I did some performance testing on faceting using the field cache (single valued field with facet.method fc and fcs).

field=100000 unique values
fc: 5% slower
fcs: 55% slower

field=100 unique values
fc: 2.5% slower
fcs: 26% slower

I'll look into it to see how we can regain some of that lost performance.

> Add FieldCache.getTermBytes, to load term data as byte[]
> --------------------------------------------------------
>
>                 Key: LUCENE-2380
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2380
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 4.0
>
>         Attachments: LUCENE-2380.patch, LUCENE-2380.patch, LUCENE-2380.patch, LUCENE-2380.patch
>
>
> With flex, a term is now an opaque byte[] (typically, utf8 encoded unicode string, but not necessarily), so we need to push this up the search stack.
> FieldCache now has getStrings and getStringIndex; we need corresponding methods to load terms as native byte[], since in general they may not be representable as String.  This should be quite a bit more RAM efficient too, for US ascii content since each character would then use 1 byte not 2.

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