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https://issues.apache.org/jira/browse/LUCENE-7401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15778024#comment-15778024
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ASF subversion and git services commented on LUCENE-7401:
---------------------------------------------------------

Commit ba47f530d1165d4518569422472bc9e4f1c04b26 in lucene-solr's branch 
refs/heads/master from [~jpountz]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=ba47f53 ]

LUCENE-7401: Make sure BKD trees index all dimensions.


> BKDWriter should ensure all dimensions are indexed
> --------------------------------------------------
>
>                 Key: LUCENE-7401
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7401
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Adrien Grand
>            Priority: Minor
>             Fix For: master (7.0), 6.4
>
>         Attachments: LUCENE-7401.patch
>
>
> The current heuristic is to use the dimension that has the largest span, so 
> if dimensions have a different distribution of values, we could theoretically 
> (but maybe in practice too?) end up with one dimension that is not indexed at 
> all and queries that are mostly selective on this dimension would need to 
> scan lots of blocks.



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