I have an index of urls, and need to display the top 10 results for a given query, but want to display only 1 result per domain. It seems that using either Hits or a HitCollector, I'll need to access the doc, grab the domain field (I'll have it parse ahead of time) and only take/display documents that are unique.
A significant percentage of the time I expect I may have to access thousands of results before I find 10 in unique domains. Is there a faster approach that won't require accessing thousands of documents?
I have examples of this that I can post when I have more time, but a quick pointer... check out the overloaded IndexSearcher.search() methods which accept a Sort. You can do really really interesting slicing and dicing, I think, using it. Try this one on for size:
example.displayHits(allBooks, new Sort(new SortField[]{ new SortField("category"), SortField.FIELD_SCORE, new SortField("pubmonth", SortField.INT, true) }));
Be clever indexing the piece you want to group on - I think you may find this the solution you're looking for.
Erik
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