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From: Felipe Hummel <felipehummel@gmail.com>
Date: Thu, 10 Mar 2011 15:32:21 -0400
Message-ID: <AANLkTikvjbQJcNt1weUQOadR=05ju198jeEa+_Zt7yEQ@mail.gmail.com>
Subject: Search one index but use IDF from another?
To: java-user@lucene.apache.org
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Hi, I'm building a system where I want to show only results indexed in the
past few days. Furthermore, I don't want to maintain a giant index with
millions of documents if I only want to return results from a couple of days
(thousands of documents).

My system heavily relies that the occurrences of terms in documents stored
in the index have a realistic distribution (consequently: realistic IDF).

That said, I would like to use a small index to return results, but I want
to compute documents score using a IDF from a much greater Index (or even an
external source).

The Similarity API doesn't seem to allow me to do this. The *idf* method
does not receive as parameter the term being used.

Another possibility is to use TrieRangeQuery to make sure the documents
shown are within the last couple of days. Again, I rather not mantain a
large index. Also this kind of query is not cheap.

Am I missing something?

Thanks


Felipe Hummel

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