Sascha Markus created SOLR-8739:
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Summary: Query Norm not calculated when SchemaSimilarityFactory is
used
Key: SOLR-8739
URL: https://issues.apache.org/jira/browse/SOLR-8739
Project: Solr
Issue Type: Bug
Components: search
Affects Versions: 5.4.1, 5.3.1
Reporter: Sascha Markus
If any kind of similarity is defined and therefore the SchemaSimilarityFactory
is defined as global similarity the queryNorm is always 1.0
The PerFieldSimilarityWrapper delegates some of the methods to the desired
Similarity but misses to delegate public float queryNorm(float
valueForNormalization)
Instead the IndexReader calls this method on the base class Similarity.
The result is that all scores are much higher.
I created a custom similarity which extends ClassicSimilarity.
To have the calculation fixed I did a local "hotfix" which always uses the
default similarity. Also wrong for some cases but fine in my scenario.
@Override
public float queryNorm(float valueForNormalization) {
return get("").queryNorm(valueForNormalization); // use default similarity
to calculate
}
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