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https://issues.apache.org/jira/browse/LUCENE-7563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15722349#comment-15722349
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Adrien Grand commented on LUCENE-7563:
--------------------------------------
I digged into it, the test failure may happen with large numbers of bytes per
dimension. It could be fixed if we limited the number of bytes per value of
BKDWriter to 16 (like we do in FieldInfos) and made {{code}} a long.
> 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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