Daniel Herlitz schrieb:
I have done a Lucene search and want to know the number of unique terms for a field (indexed) in the result. For example I have searched for a book title and want to know the number of authors (single terms) represented in the result.
Is there any way of doing this without having to scan through all the hits?
If the field you want to access (in your example the author field) is indexed (not stored, no termvectors) then the only way to achieve what you want is to get all terms of the author field with a TermEnum and compare the ids of the documents they occur in (TermDocs) with the document ids of the hit list.
You could make the author field stored. I you do so, the author field is one of the fields you get when you say hits.doc(int). If you only want to access the author field this might be a little bit inefficient. You could use termvectors for the author field. With termvectors you can selectvely retrieve terms of a field from a document.
Christoph
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