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https://issues.apache.org/jira/browse/LUCENE-2380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854615#action_12854615
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Michael McCandless commented on LUCENE-2380:
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We could also do shared byte[] blocks (private), with a public method to
retrieve the BytesRef for a given doc? Standard codec's terms index does this
-- we could share it I think.
A new byte[] per doc adds alot of RAM overhead and GC load. (Of course, so
does the String solution we use today, so it'd at least be no worse...).
> 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
> Reporter: Michael McCandless
> Fix For: 3.1
>
>
> 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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