ASF subversion and git services commented on LUCENE-7501:

Commit e8360714fae8bac3c705297641a735ed33cf47f9 in lucene-solr's branch 
refs/heads/master from [~jpountz]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=e836071 ]

LUCENE-7501: BKDReader should not store the split dimension explicitly in the 
1D case.

> Do not encode the split dimension in the index in the 1D case
> -------------------------------------------------------------
>                 Key: LUCENE-7501
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7501
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-7501.patch
> When there is a single dimension, the split dimension is always 0, so we do 
> not need to encode it in the index of the BKD tree. This would be 33% memory 
> saving for half floats, 20% for ints/floats, 11% for longs/doubles and 6% for 
> ip addresses.

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