Hi all,
I modified the setFreqCurrentDoc method of SpanScorer as follows:
( Frequency is updated only for the shortest span )
int minMatchLenght=-1;
do {
int matchLength = spans.end() - spans.start();
if(minMatchLenght==-1)minMatchLenght=matchLength;
else if(minMatchLenght>matchLength)minMatchLenght=matchLength;
more = spans.next();
} while (more && (doc == spans.doc()));
freq = getSimilarity().sloppyFreq(minMatchLenght);
Now, if a term occurs more than once in my search field, my score is not
boosted up- This is what I want.
However , just for overriding this one method, I had to create the following
new classes
1)CustomSpanScorer extending Scorer ( setFreqCurrentDoc is overriden)
2)CustomSpanWeight extends SpanWeight ( scorer is overriden to use
CustomSpanScorer )
3)CustomSpanQuery extends SpanQuery( createWeight is overriden to use
createWeight)
4) CustomSpanNearQuery extends CustomSpanQuery ( All methods are repeated)
5)CustomNearSpansOrdered - No change from NearSpansOrdered
6)CustomNearSpansUnOrdered - No change from NearSpansUnOrdered
Please let me know if this is the correct way to go about this
Rads2029 wrote:
>
> Hi all,
>
> All I have is a query running on a document with a single field which
> has some search value. This is all which will be present.
> No more documents / fields.
>
> I have the following specific requirements
>
> 1) Length of document should not affect score - Implemented as per
> lucene documentation using concept of Fair Similairty by making
> lengthnorm as 1
>
> 2) The no of times a term in the query occurs in the search field
> should not affect the score
>
> 3) I am using the spannearquery. Hence the slop should affect the score.
>
>
> I implemented 2) by changing the tf to return 1 if freq >0 .
>
> But this adversely affects 3) as the slop value is factored into the
> tf ( as per what I can see in the span scorer)
>
>
> How can I ensure the frequency of a certain term does not affect the
> score while at the same ensuring that the slop does affect it ?
>
>
> Thanks,
> Radha
>
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