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https://issues.apache.org/jira/browse/LUCENE-2854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12979141#action_12979141
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Robert Muir commented on LUCENE-2854:
-------------------------------------

Is it possible to remove this method Query.getSimilarity also? I don't 
understand why we need this method!

{noformat}
  /** Expert: Returns the Similarity implementation to be used for this query.
   * Subclasses may override this method to specify their own Similarity
   * implementation, perhaps one that delegates through that of the Searcher.
   * By default the Searcher's Similarity implementation is returned.*/
{noformat}

> 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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