I'm doing a POI(Point-of-interest) search using lucene, each POI has a "location" which is a GeoPoint/LonLat type. I need do a keyword-range search but the query result POIs need to sort by distance to a starting point.
This "distance", in fact, is a dynamic computed property which cannot be used by the SortField API, i doubt if Lucene can support a "DynamicSortField", that would be perfect. Or i had to do: use IndexSearcher.search(Query query, int n) API to first filter out Top-n POIs and then do a manual sort after these n documents' StoredField's have all be loaded, which seems not efficient. The problem is, the parameter n in IndexSearcher.search API has a usability problem, it may be not large enough to cover all the candidates. & the low-level search(Query, Collector) API seems to be short of documentations. If set the n to a very large value, the later sort proc may be very inefficient... My current idea: use more detailed near-to-far sub geo ranges to iteratively/incrementally search/filter -> load documents -> manual sort -> combine. Any suggestions?
