[jira] [Resolved] (LUCENE-2828) SimilarityDelegator broke back-compat for subclasses overriding lengthNorm

["Robert Muir (Resolved) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-2828?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir resolved LUCENE-2828.
---------------------------------

    Resolution: Won't Fix
      Assignee: Robert Muir
    
> SimilarityDelegator broke back-compat for subclasses overriding lengthNorm
> --------------------------------------------------------------------------
>
>                 Key: LUCENE-2828
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2828
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 2.9, 2.9.1, 2.9.2, 2.9.3, 2.9.4, 3.0, 3.0.1, 3.0.2, 3.0.3
>            Reporter: Michael McCandless
>            Assignee: Robert Muir
>             Fix For: 2.9.5, 3.0.4
>
>         Attachments: LUCENE-2828.patch
>
>
> In LUCENE-1420, we added Similarity.computeNorm to let the norm computation have access to the raw information (length, boost, etc.).
> But this class broke back compat with SimilarityDelegator.  We did add computeNorm there, but, it's impl just forwards to the delegee's computeNorm.  In the case where a subclass of SimilarityDelegator overrides lengthNorm, that method will no longer be invoked.
> Not quite sure how to fix this since, somehow, we have to determine whether the delegee's impl of computeNorm should be favored over the subclasses impl of the "legacy" lengthNorm.

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