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https://issues.apache.org/jira/browse/LUCENE-7563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15728811#comment-15728811
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ASF subversion and git services commented on LUCENE-7563:
---------------------------------------------------------

Commit f51766c00fc374a6fc6f407b723bd8458556de7d in lucene-solr's branch 
refs/heads/branch_6x from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=f51766c ]

LUCENE-7563: use a compressed format for the in-heap BKD index


> 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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