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From "Alexey Lef (JIRA)" <>
Subject [jira] Updated: (LUCENE-789) Custom similarity is ignored when using MultiSearcher
Date Thu, 05 Apr 2007 09:40:32 GMT


Alexey Lef updated LUCENE-789:


Attached unit test

> Custom similarity is ignored when using MultiSearcher
> -----------------------------------------------------
>                 Key: LUCENE-789
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Search
>    Affects Versions: 2.0.1
>            Reporter: Alexey Lef
>         Attachments:
> Symptoms:
> I am using Searcher.setSimilarity() to provide a custom similarity that turns off tf()
factor. However, somewhere along the way the custom similarity is ignored and the DefaultSimilarity
is used. I am using MultiSearcher and BooleanQuery.
> Problem analysis:
> The problem seems to be in MultiSearcher.createWeight(Query) method. It creates an instance
of CachedDfSource but does not set the similarity. As the result CachedDfSource provides DefaultSimilarity
to queries that use it.
> Potential solution:
> Adding the following line:
>     cacheSim.setSimilarity(getSimilarity());
> after creating an instance of CacheDfSource (line 312) seems to fix the problem. However,
I don't understand enough of the inner workings of this class to be absolutely sure that this
is the right thing to do.

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