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Posted to dev@lucene.apache.org by "Uwe Schindler (JIRA)" <ji...@apache.org> on 2016/07/25 13:11:20 UTC
[jira] [Moved] (LUCENE-7395) Query Norm not calculated when
SchemaSimilarityFactory is used
[ https://issues.apache.org/jira/browse/LUCENE-7395?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Uwe Schindler moved SOLR-8739 to LUCENE-7395:
---------------------------------------------
Affects Version/s: (was: 5.4.1)
(was: 5.3.1)
5.3.1
5.4.1
Component/s: (was: search)
Lucene Fields: New
Key: LUCENE-7395 (was: SOLR-8739)
Project: Lucene - Core (was: Solr)
> Query Norm not calculated when SchemaSimilarityFactory is used
> ---------------------------------------------------------------
>
> Key: LUCENE-7395
> URL: https://issues.apache.org/jira/browse/LUCENE-7395
> Project: Lucene - Core
> Issue Type: Bug
> 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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