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From Bill Janssen <jans...@parc.com>
Subject Re: strange idf in Lucene 2.1
Date Thu, 12 Apr 2007 09:26:55 GMT
> docfreqs (idfs) do not take into account deleted docs.
> This is more of an engineering tradeoff rather than a feature.
> If we could cheaply and easily update idfs when documents are deleted
> from an index, we would.

Wow.  So is it fair to say that the stored IDF is really the
cumulative IDF for all the documents that have ever been in the index
since it was last optimized?

Bill

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