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https://issues.apache.org/jira/browse/LUCENE-7121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15203287#comment-15203287
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ASF subversion and git services commented on LUCENE-7121:
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Commit d392940092187ba88be0d2b0882c23800f44a74e in lucene-solr's branch
refs/heads/master from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=d392940 ]
LUCENE-7121: don't write ord for single-valued points, saving 4 bytes per point
> BKDWriter should not store ords when documents are single valued
> ----------------------------------------------------------------
>
> Key: LUCENE-7121
> URL: https://issues.apache.org/jira/browse/LUCENE-7121
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: master, 6.1
>
> Attachments: LUCENE-7121.patch
>
>
> Since we now have stats for points fields, it's easy to know up front whether
> the field you are about to build a BKD tree for is single valued or not.
> If it is single valued, we can optimize space by not storing the ordinal to
> identify a point, since its docID also uniquely identifies it.
> This saves 4 bytes per point, which for the 1D case is non-trivial (12 bytes
> down to 8 bytes per doc), and even for the 2D case is good reduction (16
> bytes down to 12 bytes per doc).
> This is an optimization ... I won't push it into 6.0.
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