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https://issues.apache.org/jira/browse/LUCENE-5221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved LUCENE-5221.
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Resolution: Fixed
Fix Version/s: 4.5
5.0
> SimilarityBase.computeNorm is inconsistent with TFIDFSimilarity
> ---------------------------------------------------------------
>
> Key: LUCENE-5221
> URL: https://issues.apache.org/jira/browse/LUCENE-5221
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 4.4
> Reporter: Yubin Kim
> Labels: normalize, search, similarity
> Fix For: 5.0, 4.5
>
> Attachments: LUCENE-5221.patch, LUCENE-5221.patch
>
>
> {{SimilarityBase.computeNorm}} Javadoc indicates that the doc length should
> be encoded in the same way as {{TFIDFSimilarity}}. However, when
> {{discountOverlaps}} is {{false}}, what gets encoded is
> {{SmallFloat.floatToByte315((boost / (float) Math.sqrt(docLen / boost)));}}
> rather than {{SmallFloat.floatToByte315((boost / (float)
> Math.sqrt(length)));}} due to the extra {{/ state.getBoost()}} term in
> {{SimilarityBase.computeNorm}}:
> final float numTerms;
> if (discountOverlaps)
> numTerms = state.getLength() - state.getNumOverlap();
> else
> numTerms = state.getLength() */ state.getBoost();*
> return encodeNormValue(state.getBoost(), numTerms);
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