craigtaverner opened a new issue, #12020: URL: https://github.com/apache/lucene/issues/12020
### Description When performing a search using a shape geometry query of relation type `QueryRelation.CONTAINS`, it is possible to get a false positive when two geometries intersect, but neither actually contains the other. This happens if the indexed geometry is a polygon that is so flat that one of its triangles is simplified to a single line segment. The bug is that the line segment currently records whether it is part of the external polygon by taking that knowledge from first line segment of the triangle, not necessarily the part of the triangle being retained. This first line segment could be an internal line (part of the triangle, but not the polygon). The simplification code should instead take this knowledge from a line segment that is not being collapsed by the simplification. The consequence of this bug occur later during the contains search when the search query deduces that the geometry is contained because the polygon is not closed. The search does not realise it intersects an outer line of the polygon because that line is not correctly marked as outer. ### Version and environment details _No response_ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org
