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https://issues.apache.org/jira/browse/LUCENE-2854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-2854.
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Resolution: Fixed
> Deprecate SimilarityDelegator and Similarity.lengthNorm
> -------------------------------------------------------
>
> Key: LUCENE-2854
> URL: https://issues.apache.org/jira/browse/LUCENE-2854
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Michael McCandless
> Fix For: 3.1, 4.0
>
> Attachments: LUCENE-2854.patch, LUCENE-2854_fuzzylikethis.patch
>
>
> SimilarityDelegator is a back compat trap (see LUCENE-2828).
> Apps should just [statically] subclass Sim or DefaultSim; if they really need
> "runtime subclassing" then they can make their own app-level delegator.
> Also, Sim.computeNorm subsumes lengthNorm, so we should deprecate lengthNorm
> in favor of computeNorm.
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