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https://issues.apache.org/jira/browse/LUCENE-7121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-7121:
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Attachment: LUCENE-7121.patch
Patch.
> 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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