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Date: Fri, 09 May 2008 15:07:47 +0100
From: Paolo Capriotti <paolo.capriotti@deri.org>
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Subject: Using stored fields for scoring
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Hi all,
I am looking for a way to include a stored (non-indexed) field in the 
computation of scores for a query.
I have tried using a ValueSourceQuery with a ValueSource subclass that 
simply retrieves the document and gets the field, like:

public float floatVal(int doc) {
   reader.document(doc, selector).getBinaryValue("myfield");
   ....
}

but that's too slow, because it ends up doing a lookup for each matching 
document.
Is it possible to use a stored field in a FunctionQuery or 
ValueSourceQuery in an efficient way (i.e. not dependent on the number 
of retrieved documents)?
If the answer is yes, is it possible to update such a value in place 
without removing and reindexing the document?

Thanks in advance.

Paolo Capriotti

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