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https://issues.apache.org/jira/browse/LUCENE-789?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doron Cohen resolved LUCENE-789.
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Resolution: Fixed
Fix Version/s: 2.2
Fix committed, thanks Alexey!
It should be noted that as before this fix, creating a multiSearcher from
Searchers for whom custom similarity was set has no effect - the custom
similarities of those searchers are masked by the similarity of the
MultiSearcher. This is as designed, because MultiSearcher operates on
Searchables (not on Searchers).
> Custom similarity is ignored when using MultiSearcher
> -----------------------------------------------------
>
> Key: LUCENE-789
> URL: https://issues.apache.org/jira/browse/LUCENE-789
> Project: Lucene - Java
> Issue Type: Bug
> Components: Search
> Affects Versions: 2.0.1
> Reporter: Alexey Lef
> Assigned To: Doron Cohen
> Fix For: 2.2
>
> Attachments: 789_patch.txt, TestMultiSearcherSimilarity.java
>
>
> 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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