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From "Miguel Costa" <>
Subject posting lists of index are sorted?
Date Mon, 12 May 2008 15:51:30 GMT
Hi all,
I have two questions related to the Lucene ranking.
1) Does anyone know how the posting lists (term -> doc1 doc2 doc3) from the
index are sorted?
It is used a TFxIDF value, the boost value or none to sort documents (doc1
doc2 doc3)? Does Lucene compute the ranking for all the documents in the
posting lists or only part?
2) Does anyone know how to add more ranking features to the ranking function
of Lucene (eg. Pagerank, BM25)?
Extending the DefaultSimilarity class from Lucene is insufficient to achieve
this. It is only prepared to change the TFxIDF function.
Thanks in advance.


Miguel Costa 



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