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https://issues.apache.org/jira/browse/LUCENE-7563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15722537#comment-15722537
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Michael McCandless commented on LUCENE-7563:
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Ahh, OK; I think we should restrict {{TestBKD}} to the same dimension count /
bytes per dimension limits that Lucene enforces? As we tighten up how we
compress it on disk and the in-heap index we should only test for what we
actually offer to the end user.
> 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.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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