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https://issues.apache.org/jira/browse/LUCENE-8521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16637409#comment-16637409
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Nicholas Knize commented on LUCENE-8521:
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Attached patch changes LatLonShape encoding to 7 dimensions of size
{{Long.BYTES}}. The first 4 dimensions are the bounding box of the triangle
encoded as {{Integer.BYTES}} size. (leading zeros are compressed while building
the common prefix of the nodes). The remaining 3 dimensions are the three
vertices of the triangle encoded as {{Long.BYTES}} size in the form of X1Y1
X2Y2 X3Y3. With selective indexing provided by LUCENE-8496 the index is built
as a 2 dimension bounding box, and the data dimensions are used when computing
the triangle relation with the target query (Polygon or BoundingBox).
> Change LatLonShape encoding to use selective indexing
> -----------------------------------------------------
>
> Key: LUCENE-8521
> URL: https://issues.apache.org/jira/browse/LUCENE-8521
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Nicholas Knize
> Priority: Major
> Attachments: LUCENE-8521.patch
>
>
> LUCENE-8496 allows for selecting the first n dimensions to be used for
> building the index and the remaining dimensions to be used as data
> dimensions. This feature changes {{LatLonShape}} encoding to a 7 dimension
> encoding instead of 6; where the first 4 are index dimensions defining the
> bounding box of the {{LatLonShape.Triangle}} and the remaining 3 data
> dimensions defining the vertices of the triangle.
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