Artem, Do you need any scoring information at all on that field? How about using a QueryFilter for those fields?
Michael -----Original Message----- From: Artem Chereisky [mailto:a.cherei...@gmail.com] Sent: Wed 12/9/2009 4:53 PM To: lucene-net-user@incubator.apache.org; lucene-net-develo...@incubator.apache.org Subject: idf on per-field basis Hi, I came across a situation when my scores are adversely affected by the IDF component. Let me explain. My index documents contain a number of fields, for some, TF and IDF are important and need to be taken into account, for others niether TF nor IDF should apply. I dealt with TF by omiting norms during indexing but I can't find a way to calculate IDF for certain fields only. The formula for IDF is defined in Similarity. I have my own implementation of Similarity where I can set it to 1 or use the default implementation. mySearcher.SetSimilarity is where I tell Lucene which similarity instance to use, but that's global, so it applies to all fields in the index. So, here's my question. Is there a way to calculate IDF on per-field basis? Regards, Art
