CODEWITHSUNDEEP
solrlucene
C0deAttack
C0deAttack

Reputation: 24667

Ignore tf/idf at query time in Solr

I am trying to boost particular documents based on a field value. It is generally working ok but some documents return a higher score even though they have a smaller boost value.

After debugging the query with the debugQuery=on request parameter I have noticed that the idf function is returning a higher score for a particular document, which is affecting the overall score.

Is there a way to ignore tf/idf scoring at query time?

Upvotes: 6

Views: 5547

Answers (1)

femtoRgon
femtoRgon

Reputation: 33351

You'll want to create a custom Similarity which overrides the tf and idf methods, and use it in place of the DefaultSimilarity.

Something like:

class CustomSimilarity extends DefaultSimilarity {

    @Override
    public float tf(float freq) {
        return 1.0;
    }

    @Override
    public float tf(int freq) {
        return 1.0;
    }

    @Override
    // Note the signature of this method may now take longs:
    //   public float idf(long docFreq, long numDocs)
    public float idf(int docFreq, int numDocs) {
        return 1.0;
    }
}

The set it to use that similarity in your schema.xml:

<similarity class="myorg.mypackage.CustomSimilarity"/>

Upvotes: 9

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