[jira] [Commented] (LUCENE-7395) Query Norm not calculated when SchemaSimilarityFactory is used

["Uwe Schindler (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-7395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15391854#comment-15391854 ] 

Uwe Schindler commented on LUCENE-7395:
---------------------------------------

This affects also Lucene, so I moved it.

> 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: 5.3.1, 5.4.1
>            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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