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https://issues.apache.org/jira/browse/LUCENE-7501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15628372#comment-15628372
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ASF subversion and git services commented on LUCENE-7501:
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Commit 35f3cd9bd95607983fa4704c66f61bf59cd40860 in lucene-solr's branch
refs/heads/branch_6x from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=35f3cd9 ]
LUCENE-7501: fix back-compat bug; add test
> 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: Blocker
> Fix For: master (7.0), 6.3
>
> Attachments: LUCENE-7501.patch, LUCENE-7501.patch, 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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