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From Mikhail Khludnev <>
Subject Re: Custom Solr indexer/searcher
Date Fri, 16 Nov 2012 06:54:27 GMT
It sounds like you need to look into few samples of similar things in
Lucene. On top of my head FuzzyQuery from 4.0, which finds terms similar to
the given in FST for query expansion. Generic query expansion is done via
MultiTermQuery. Index time terms expansion is shown in TrieField and btw
NumericRangeQuery (it should match with your goal a lot). All these are
single dimension samples, but AFAIK KD-tree is multidimensional, look into
GeoHashField which puts two dimensional points into single terms with
ability to build ranges on them see GeoHashField.createSpatialQuery().

Happy hacking!

On Fri, Nov 16, 2012 at 10:34 AM, John Whelan <> wrote:

> Scott,
> I probably have no idea as to what I'm saying, but if you're looking for
> finding results in a N-dimensional space, you might look at creating a
> field of type 'point'. Point-type fields have a dimension attribute; I
> believe that it can be set to a large integer value.
> Barring that, there is also a 'dist()' function that can be used to work
> with multiple numeric fields in order sort results based on closeness to a
> desired coordinate. The 'dist function takes a parameter to specify the
> means of calculating the distance. (For example, 2 -> 'Euclidean distance'.
> I don't know the other options.)
> In the worst case, my response is worthless, but pops your question back up
> in the e-mails...
> Regards,
> John

Sincerely yours
Mikhail Khludnev
Principal Engineer,
Grid Dynamics


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