[jira] [Created] (LUCENE-7069) Add LatLonPoint.nearest to find closest indexed point to a given query point

["Michael McCandless (JIRA)" <ji...@apache.org>]

Michael McCandless created LUCENE-7069:
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             Summary: Add LatLonPoint.nearest to find closest indexed point to a given query point
                 Key: LUCENE-7069
                 URL: https://issues.apache.org/jira/browse/LUCENE-7069
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Michael McCandless
            Assignee: Michael McCandless
             Fix For: master, 6.1


KD trees (used by Lucene's new dimensional points) excel at finding "nearest neighbors" to a given query point ... I think we should add this to Lucene's sandbox as:

{noformat}
  public static Document nearest(IndexReader r, String field, double lat, double lon) throws IOException
{noformat}

I only implemented the 1 nearest neighbor for starters ... I think we can easily generalize this in the future to K nearest.

It could also be generalized to more than 2 dimensions, but for now I'm making the class package private in sandbox for just the geo2d (lat/lon) use case.

I don't think this should go into 6.0.0, but should go into 6.1: it's a new feature, and we need to wrap up and ship 6.0.0 already ;)



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