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https://issues.apache.org/jira/browse/LUCENE-652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12685385#action_12685385
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Uwe Schindler commented on LUCENE-652:
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Fine! In my opinion the little overhead of UnicodeUtils is far lower that the
one by compression and the ByteArrayStreams.
{quote}
bq. Can i uncompress fields compressed using the old tools also by retrieving
the byte array and using CompressionTools?
Well... yes, but: you can't actually get the compressed byte[]
(because Lucene will decompress it for you).
{quote}
You can: With a FieldSelector that load the fields for merge, you get the raw
binary values (found out from the code of FieldsReader).
> Compressed fields should be "externalized" (from Fields into Document)
> ----------------------------------------------------------------------
>
> Key: LUCENE-652
> URL: https://issues.apache.org/jira/browse/LUCENE-652
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 1.9, 2.0.0, 2.1
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-652.patch, LUCENE-652.patch, LUCENE-652.patch
>
>
> Right now, as of 2.0 release, Lucene supports compressed stored fields.
> However, after discussion on java-dev, the suggestion arose, from Robert
> Engels, that it would be better if this logic were moved into the Document
> level. This way the indexing level just stores opaque binary fields, and
> then Document handles compress/uncompressing as needed.
> This approach would have prevented issues like LUCENE-629 because merging of
> segments would never need to decompress.
> See this thread for the recent discussion:
> http://www.gossamer-threads.com/lists/lucene/java-dev/38836
> When we do this we should also work on related issue LUCENE-648.
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