Order by distance on Spatial Searches (porting from Lucene4 Java)

[Albert Clemente Peláez]

Hello,

 

A few days ago I started using spatial searches with 3.0.3 release and the 
Spatial Contrib + Spatial4N.

 

Although I found some starting problems, It finally worked great when I 
understood that the Spatial Contrib was based on the new Spatial of Lucene 4 
for Java.

 

 

My problem now is that although I can search by proximity, I cannot order by 
distance, and that is due to it hasn't been ported the type 
SortField.REWRITABLE and the ValueSourceComparatorSource and 
ValueSourceComparator that able to order by distance on spatial searches.

 

 

I'm just trying that these staff works (sample from java):

 

    //--Match all, order by distance

    {

      Point pt = ctx.makePoint(60, -50);

      ValueSource valueSource = strategy.makeDistanceValueSource(pt);//the 
distance (in degrees)

      Sort reverseDistSort = new 
sort(valueSource.getSortField(false)).rewrite(indexSearcher);//true=asc dist

      TopDocs docs = indexSearcher.search(new MatchAllDocsQuery(), 10, 
reverseDistSort);

      assertDocMatchedIds(indexSearcher, docs, 4, 20, 2);

 

 

 

If I port this java classes and functions to Lucene.net and Contrib.Spatial, 
I'd like that it would be include in the final release, just to be sure we will 
be able to continue upgrading to future Lucene.net releases without recoding 
our apps.

 


Please let me know If I'm not right or If you know a better aproach for ording 
by distance. 

 

 

Regards,

 

 

Albert Clemente