[jira] [Commented] (LUCENE-9149) Increase data dimension limit in BKD

["ASF subversion and git services (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-9149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17032700#comment-17032700 ] 

ASF subversion and git services commented on LUCENE-9149:
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Commit 206a70e7b79050db0d351135e406cfb997cbeee1 in lucene-solr's branch refs/heads/master from Nicholas Knize
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=206a70e ]

LUCENE-9149: Increase data dimension limit in BKD


> Increase data dimension limit in BKD
> ------------------------------------
>
>                 Key: LUCENE-9149
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9149
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Nick Knize
>            Priority: Major
>         Attachments: LUCENE-9149.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> LUCENE-8496 added selective indexing; the ability to designate the first K <= N dimensions for driving the construction of the BKD internal nodes. Follow on work stored the "data dimensions" for only the leaf nodes and only the "index dimensions" are stored for the internal nodes. While {{maxPointsInLeafNode}} is still important for managing the BKD heap memory footprint (thus we don't want this to get too large), I'd like to propose increasing the {{MAX_DIMENSIONS}} limit (to something not too crazy like 16; effectively doubling the index dimension limit) while maintaining the {{MAX_INDEX_DIMENSIONS}} at 8.
> Doing this will enable us to encode higher dimension data within a lower dimension index (e.g., 3D tessellated triangles as a 10 dimension point using only the first 6 dimensions for index construction)
>  



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