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From Erik Hatcher <>
Subject Re: Query Scoring
Date Sat, 31 Dec 2005 12:40:19 GMT

I'm not sure I understand what you're asking.  IDF doesn't factor  
into highlighting.

IDF calculations are useful in scoring documents during a search,  
such that the most relevant documents are returned, but again this is  
unrelated to highlighting.

Could you elaborate on what you're after?


On Dec 30, 2005, at 12:02 PM, Harini Raghavan wrote:

> Hi,
> I have a requirement to highlight search keywords in the results and
> display the matching fragment of the text with the results. I am using
> the Hits highlighting mentioned in Lucene in Action.
> Here is the search query(BooleanQuery) I am passing to the  
> IndexSearcher
> and QueryScorer:
> +DocumentType:news
> +(CompanyId:10 CompanyId:20 CompanyId:30 CompanyId:40)
> +FilingDate:[20041201 TO 20051201]
> +(Content:"cost saving" Content:"cost savings" Content:outsource
> Content:outsources Content:downsize Content:downsizes
> Content:restructuring Content:restructure)
> I do not quite understand how the query scoring actually works &  
> how Inverse Document Frequency(IDF) calculations are useful?  Can
> someone shed some light on this using the given query as an example?
> Thanks,
> Harini
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