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https://issues.apache.org/jira/browse/LUCENE-7563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15727037#comment-15727037
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ASF subversion and git services commented on LUCENE-7563:
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Commit bd8b191505d92c89a483a6189497374238476a00 in lucene-solr's branch
refs/heads/apiv2 from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=bd8b191 ]
LUCENE-7563: remove redundant array copy in PackedIndexTree.clone
> BKD index should compress unused leading bytes
> ----------------------------------------------
>
> Key: LUCENE-7563
> URL: https://issues.apache.org/jira/browse/LUCENE-7563
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Fix For: master (7.0), 6.4
>
> Attachments: LUCENE-7563-prefixlen-unary.patch,
> LUCENE-7563-prefixlen-unary.patch, LUCENE-7563.patch, LUCENE-7563.patch,
> LUCENE-7563.patch, LUCENE-7563.patch
>
>
> Today the BKD (points) in-heap index always uses {{dimensionNumBytes}} per
> dimension, but if e.g. you are indexing {{LongPoint}} yet only use the bottom
> two bytes in a given segment, we shouldn't store all those leading 0s in the
> index.
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