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Posted to dev@lucene.apache.org by "Nicholas Knize (JIRA)" <ji...@apache.org> on 2018/10/03 19:23:00 UTC
[jira] [Commented] (LUCENE-8521) Change LatLonShape encoding to use
selective indexing
[ https://issues.apache.org/jira/browse/LUCENE-8521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16637409#comment-16637409 ]
Nicholas Knize commented on LUCENE-8521:
----------------------------------------
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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