[jira] [Updated] (LUCENE-7309) Speed up Polygon2D construction

["Adrien Grand (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7309?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adrien Grand updated LUCENE-7309:
---------------------------------
    Attachment: LUCENE-7309.patch

Here is a patch. IndexAndSearchOpenStreetMaps reports that the QPS goes from 2.58 (master) to 3.75 (patch) with the Cleveland polygon. Polygon2D construction alone went from ~260ms to ~160ms.

> Speed up Polygon2D construction
> -------------------------------
>
>                 Key: LUCENE-7309
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7309
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-7309.patch
>
>
> Polygon2D.create recursively sorts on each dimension to build a tree. However, it does not really need to sort the data, it just needs to compute the median and partition other values around it, which can be performed in O(n). If I am not mistaken, this would make Polygon2D.create run in O(n log(n)) rather than O(n log^2(n)) today.



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