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https://issues.apache.org/jira/browse/LUCENE-7501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15628008#comment-15628008
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Adrien Grand commented on LUCENE-7501:
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The patch looks good, thanks for looking into it. To be safe, maybe we should
undo the change on the 6.3 branch and apply your patch to master/6.x?
> 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
>
>
> 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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